Pith. sign in

REVIEW 3 major objections 6 minor 54 references

Evolving dunes under flow reversals: from an initial heap toward an inverted dune

T0 review · 3 major / 6 minor · reviewed 2026-08-15 · deepseek-v4-flash

Challenge this review Re-run · record.json Download PDF Read on arXiv ↗ Review JSON

Pith's one-line read This paper argues that a dune under reversed flow takes about twice as long to become an inverted, steady-state dune as it took to form from an initial heap, and that the same turnover timescale used for growth describes both processes.

desk verdict New dune-reversal data and open grain-scale simulations, but the 2D/3D timescale equivalence claim doesn't survive contact with the paper's own numbers. read the letter →

arxiv 2505.06707 v1 pith:UFDSRZWN submitted 2025-05-10 physics.geo-ph physics.flu-dyn

Willian Righi Assis , Erick de Moraes Franklin , Nathalie Vriend This is my paper · ORCID
classification physics.geo-phphysics.flu-dyn
keywords dunereversalbarchandunessubaqueousflowreversalsCFD-DEMturnovertimebedloadtransportmorphodynamics
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper argues that a dune under reversed flow takes about twice as long to become an inverted, steady-state dune as it took to form from an initial heap, and that the same turnover timescale used for growth describes both processes. The authors reach this conclusion by combining experiments on 2D dunes in a circular flume with grain-resolving CFD-DEM simulations of 3D barchans, tracking the barchan's central slice as a proxy for a 2D dune. They find that the central slice behaves roughly like a 2D dune, so cheaper 2D-slice computations could predict reversal timescales at geophysical scales. If true, the result gives a simple predictive rule: formation takes about five turnover times, inversion about ten.

What carries the argument

The load-bearing object is the turnover timescale $$t_c = \frac{L_{eq}(\rho_p/\rho_f)(\rho_p/\rho_f - 1) g d}{(u_*^2 - u_{th}^2)^{3/2}} \sim \frac{L_{eq}}{C},$$ where $L_{eq}$ is the developed dune length, $C$ its celerity, and the transport rate follows Meyer-Peter–Muller. This supplies the common clock that makes formation and inversion comparable; the paper reads the characteristic times off plateaus in $Z/L$ and $L_{stoss}/L$ for 2D dunes and off horn length for 3D barchans. The second mechanism is the central-slice reduction: transverse dispersion on the stoss slope is balanced by inward avalanching at the lee, so the middle slice retains the morphodynamic memory of the barchan and can stand in for the whole dune.

What would settle it

Re-run the reversal experiment starting from a developed dune that was not formed from a heap (for example, a dune equilibrated on a flat bed) and measure the inversion time divided by $t_c$; if the ratio departs from roughly 2, the factor-of-two rule is tied to the heap initial condition and not a universal reversal timescale.

Watch

Extended reading notes

Core claim

On the paper's own terms, the central discovery is a factor of two in characteristic timescales: dunes formed from a heap reach steady state in about $t/t_c \approx 5$, while reversing an already developed dune into its inverted form takes about $t/t_c \approx 10$, and the same $t_c$ computed from the developed dune's length and transport rate works for both. The reversal proceeds by grains on the lee side climbing back up while the internal part and toe remain static, forming a new lee face of varying slope on the former stoss side. In the 3D simulations, the barchan's central slice follows the same morphological evolution as the 2D dune, and the horns shorten, vanish around $t/t_c \approx 1$, and regrow. The paper concludes that the central slice of a barchan behaves roughly as a 2D dune, that the Meyer-Peter–Muller-type scaling behind $t_c$ remains valid during reversals, and that about one fifth of the grains in the central slice stay static through the whole process.

Load-bearing premise

The paper's central ratio rests on using the same turnover time $t_c$, fixed by the dune's pre-reversal size and flow, to measure both formation and reversal; if the relevant length or transport rate changes during inversion, the factor of two could be an artifact of that normalization.

Editorial extensions

If this is right

  • Barchan reversal timescales in geophysical settings can be estimated from 2D slice computations rather than full grain-resolving 3D simulations.
  • The same $t_c$ scaling law used for dune growth remains valid during flow reversals, giving one clock for both formation and inversion.
  • A dune under reversing flow loses roughly 10–15% more grains than during its formation from a heap, so inversion is not a symmetric replay of growth.
  • Continuum slice models that exchange mass between vertical slices are adequate for simulating barchan fields, including subaqueous cases.
  • The measured inversion time of about $10\,t_c$ can be used directly to estimate how long a reversing wind or current must act to fully reshape a dune.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the factor-of-two rule survives changing the initial condition (for example, a dune developed on a flat bed rather than from a heap), it could serve as a field diagnostic: the ratio of reversal to formation timescales may fingerprint the history of wind or current reversals.
  • The roughly 20% static-grain fraction suggests the dune interior is not remobilized by reversal; a testable consequence is that grain-age distributions in an inverted dune should show a core of old grains, which could be checked with colored grains in experiments.
  • The central-slice equivalence was demonstrated for subaqueous rolling and sliding transport; extending the same comparison to aeolian saltation, where grain inertia and transport rates are much larger, would test whether the factor of two is universal or specific to bedload.
  • Because the authors note that reversal timescales could differ for dunes formed from a flat bed, a direct numerical test of that alternative initial condition would clarify whether the reported ratio is intrinsic to the reversal process or inherited from the heap start.
Share X Bluesky LinkedIn Reddit HN

Signed reviews

No signed human review yet.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 6 minor

Summary. The manuscript reports experiments on 2D subaqueous dunes in a circular flume and CFD-DEM simulations of 3D barchans, both evolving from an initial heap to a steady dune and then through a 180° flow reversal. The central quantitative claims are: (i) the characteristic formation time of 2D dunes is about 5tc, with tc taken from Alvarez and Franklin (2017); (ii) the 3D barchan central slice attains a developed state on a comparable timescale (~1–1.5tc for horn growth); (iii) flow reversal takes about twice the formation time in both the 2D experiments (~10tc) and the 3D simulations (~2–2.5tc); and (iv) a significant fraction of grains remains static during both phases. On this basis the paper concludes that the central slice of a barchan behaves roughly as a 2D dune and that 2D slice simulations can predict reversal timescales in 3D geophysical settings.

Significance. If the quantitative claims held, the paper would provide a strong practical justification for using 2D slice models to estimate barchan reversal times, and the grain-scale tracking of static and mobile fractions is a valuable contribution. The manuscript is commendable for publishing the experimental images, processing scripts, and CFD-DEM setup in an open repository, and for grounding the reversal-time observation in direct measurements in both experiments and simulations. However, the central quantitative equivalence between the 2D and 3D timescales is not established by the reported numbers, so the applied claim is currently a proof-of-concept rather than a demonstrated result.

major comments (3)
  1. [Sections 4.1–4.3, Figures 3 and 5] The reported numbers do not support the statement that the central slice of a barchan behaves roughly as a 2D dune in terms of timescales. In the 2D experiments, formation and reversal are read from Z/L and LStoss/L plateaus as t/tc ≈ 5 and ≈ 10. In the 3D barchan simulations, the equivalent times are read from horn-length plateaus as t/tc ≈ 1–1.5 and ≈ 2–2.5. The factor-of-two ratio holds within each dataset (10/5 = 2 and ≈2.5/1.25 ≈ 2), but the absolute times differ by a factor of approximately 3–4 after normalization by the same tc. Unless the authors demonstrate that the different observables (Z/L and LStoss/L versus horn length) are interchangeable proxies for the same morphodynamic state, and that tc remains the correct normalization during reversal, the conclusion that 2D slices predict realistic 3D timescales does not follow from the data.
  2. [Section 4.1, Eq. (5)] The central timescale tc is defined by dropping all constants and using Leq measured from the developed dune, and both formation and reversal times are normalized by this same tc. The paper does not verify that tc, computed from the pre-reversal equilibrium dune, governs the turnover during the reversal phase, when the dune shape changes substantially and the relevant length scale might differ. Since the '2x' rule is a statement about ratios of times that share this tc, an O(1) error in tc during the reversed phase could absorb or create the reported factor of two. I ask the authors to test this explicitly, for example by computing tc from the instantaneous dune length or celerity during the inversion and replotting Figures 3b and 5b with the time-dependent normalization.
  3. [Section 4.1, paragraph on central slice width and Figure S11] The simulation slices the 3D barchan to a central width of 2 mm ≈ 10 grain diameters 'to avoid excessive fluctuations', but no convergence test or sensitivity analysis is provided to show that this width is representative of a 2D dune rather than an artifact of the small number of grains. The claim that the central slice behaves as a 2D dune is also based on comparing a horn-length plateau in 3D with Z/L and LStoss/L plateaus in 2D; these observables need not saturate simultaneously, and the paper itself notes that Z/L comparisons are inconclusive. A direct geometric comparison—for example, superimposing the normalized shape of the central slice and the experimental 2D profile at matching t/tc—would provide the missing evidence.
minor comments (6)
  1. [Section 4.2] The statement 'the total time for achieving an inverted dune is t/tc ≈ 10' should state the exact criterion used to define 'achieving an inverted dune' (for instance, when the new avalanche face reaches the trailing edge), and should specify whether the same criterion was applied in the 3D simulations.
  2. [Section 4.1, Eq. (5) and surrounding text] Please define the dune celerity C explicitly before Equation (5), and clarify that the proportionality C ~ q/Z ~ q/Ldrag is an order-of-magnitude estimate with all prefactors dropped.
  3. [Table 1] For the reversal cases g–l, please state whether the listed Z and L values are measured at the onset of the reversed flow (t = 0) or at the end of the initial development phase, as this affects the normalization by Leq in Equation (5).
  4. [Abstract and Conclusions] The abstract and conclusions state that the characteristic time for 2D dune development 'scales with' that for 3D barchans, while the body reports specific ratios; please make the quantitative claim consistent throughout the manuscript.
  5. [Throughout] There is a typo in the Conclusions ('similations') and the text alternates between 'eolian' and 'aeolian'; please standardize the spelling.
  6. [Figure 5] In Figures 5a and 5b, the horn length is normalized by Ldrag while time is normalized by tc; please state explicitly that Ldrag is used only for the length normalization, to avoid any impression that the time axis also uses Ldrag.

Circularity Check

0 steps flagged · score 2.0 of 10

No circular derivation: the factor-of-two reversal rule is an internal ratio that cancels the tc normalization; the 2D/3D equivalence is an overstated scaling comparison, not a circularity.

full rationale

The paper's central result, that reversal time is twice formation time, is measured in both 2D experiments (5tc vs 10tc) and 3D simulations (1–1.5tc vs 2–2.5tc). Because both times are divided by the same timescale tc, the ratio is independent of the absolute value of tc and of the constants dropped in Equation 5, so it cannot be an artifact of normalization. The 2D/3D timescale comparison does import tc from Alvarez and Franklin (2017), a same-group citation, but that citation is not load-bearing: the current simulations provide their own horn-growth plateau (1–1.5tc), and the paper checks tc against a directly measured turnover time using the dune celerity (Figure S12 and supporting text), giving the comparison independent content. The manuscript flags its own limitations (constants dropped in Eq. 5; the caveat that 'characteristic times proposed can be different when barchans are formed from a flat bed'; and the unmeasured grain flux during reversal), and these affect precision but do not reduce any equation to its input. The main weakness is quantitative rather than circular: the 2D formation time (≈5tc) and the 3D horn-growth time (≈1–1.5tc from the simulations, or ≈2.5tc from prior work) differ by a factor of 2–4, so calling the timescales 'equivalent' overstates the data. That is an evidentiary gap in the applied claim that 2D slices predict realistic 3D timescales, not a by-construction identity. No fitted parameter is renamed as a prediction, and no uniqueness argument from the authors' prior work forces the central choice.

Assumptions & free parameters 3 free parameters · 5 assumptions · 0 invented entities

The paper introduces no new physical entities. Its load-bearing assumptions are the definition of the timescale tc with dropped constants, the transferability of the prior CFD-DEM validation, and the ad hoc choice of central-slice width. The free parameters are the characteristic times read from the data with no error bars, which support the central scaling claims.

free parameters (3)
  • tc timescale prefactor = dropped constants; tc values 13-180 s (experiments), 51-68 s (simulations)
    Equation 5 defines tc as Leq(ρp/ρf)(ρp/ρf-1)gd/(u*^2-uth^2)^{3/2} with 'all constants dropped'. Used to normalize all times in the paper, so the reported 5tc and 10tc values are partially normalized by the same data they characterize.
  • Characteristic formation time = t/tc ≈ 5
    Identified from the intersection of fast and slow regions in plots of Z/L and LStoss/L (Figure 3), with supporting fits in Figures S14 and S15. No error bars are provided.
  • Characteristic reversal time = t/tc ≈ 10
    Identified from the plateau in LStoss/L and Z/L during flow reversal (Figure 3b, 3d). The factor of two relative to formation is a headline result.
assumptions (5)
  • domain assumption tc as defined in Equation 5, with all constants dropped, is a common turnover timescale for both 2D dunes and barchan central slices, and Z ≈ 0.1L ~ Lsat ~ Ldrag.
    This scaling is used to normalize time in all figures and to compare 2D experiments with 3D simulations. The dropped constants allow O(1) ambiguity, which is large enough to absorb the factor 5 versus 2.5 discrepancy.
  • domain assumption The Meyer-Peter-Müller bedload transport correlation applies in the experimental conditions of this water flume.
    Used in Equation 5 through the transport rate q to compute tc. The correlation is empirical and originally calibrated for open-channel flows.
  • domain assumption The CFD-DEM setup validated in Lima et al. (2022) is representative of the subaqueous dune experiments despite different Reynolds number, grain diameter, and system size.
    The simulations use grains of 0.15-0.25 mm and Re = 14,000, while experiments use 1.0-1.3 mm grains and Re = 0.73-1.10 x 10^5. The paper relies on prior validation rather than direct quantitative matching.
  • ad hoc to paper The central slice width of 2 mm (about 10 grain diameters) in the simulations is sufficient to represent 2D dune behavior while avoiding spanwise fluctuations.
    This width is chosen in Section 4.1 'to avoid excessive fluctuations' and is not independently justified; it affects the grain mobility counts and shape measurements.
  • domain assumption The superposed-area method in the 2D experiments gives a good estimate of the fraction of static grains.
    Used in Sections 4.1 and 4.2 to estimate 62 percent (formation) and 30 percent (reversal) static grains. The authors later note this disagrees with the simulation-based count for formation, so the axiom is questionable.

how reviews work

0 comments
Cite this review

Pith. "Pith review of Evolving dunes under flow reversals: from an initial heap toward an inverted dune." pith.science (2026). https://pith.science/paper/UFDSRZWN

@misc{pith2026250506707,
  author       = {Pith},
  title        = {Pith review of: Evolving dunes under flow reversals: from an initial heap toward an inverted dune},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/UFDSRZWN}},
  note         = {Machine review of arXiv:2505.06707}
}
read the original abstract

Sand dunes are ubiquitous in nature, and are found in abundance on Earth and other planetary environments. One of the most common types are crescent-shaped dunes known as barchans, whose mid-line could be assumed to behave as 2D dunes. In this work, we (i) compare the morphology of the mid-line of 3D barchans with 2D dunes; and (ii) track the evolution of 3D barchans and 2D dunes while reversing flow conditions. We performed experiments on 2D dunes in a 2D flume and Euler-Lagrange simulations of 3D bedforms. In all reversal experiments and simulations, the initial condition start with a conical heap deforming into a steady-state dune, which is then perturbed by reversing the flow, resulting in an inverted dune. We show that during the reversal the grains on the lee side immediately climb back onto the dune while its internal part and toe remain static, forming a new lee face of varying angle on the previous stoss slope. We show that (i) the characteristic time for the development of 2D dunes scales with that for 3D barchans, (ii) that the time for dune reversal is twice the time necessary to develop an initial triangular or conical heap to steady-state, and (iii) that a considerable part of grains remain static during the entire process. Our findings reveal the dynamics for dune reversal, and highlight that numerical computations of barchans based on 2D slices, which are more feasible in geophysical scales, predict realistic outcomes for the relevant time-scales.

Figures

Figures reproduced from arXiv: 2505.06707 by the authors.

Figure 1
Figure 1. (a) Photograph and (b) Layout of the circular flume. –5– [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. (a) Snapshots showing lateral-view images of an initial heap being deformed into a 2D dune for case c ( [PITH_FULL_IMAGE:figures/full_fig_p008_2.png] view at source ↗
Figure 3
Figure 3. (a) and (b) Time evolution of the vertical position of the maximum height (crest) of bedforms Z normalized by the dune length L, for the initial development and reversal condi￾tions, respectively. (c) and (d) Time evolution of the ratio of the length of the stoss side LStoss to that of the entire dune L, for the initial development and reversal conditions, respectively. (e) and (f) Dune displacement during the initi… view at source ↗
Figures from the paper (5 more)
Figure 4
Figure 4. Figure 4: Snapshots showing the central slice of a bedform being deformed into a barchan dune. The water flow is from left to right and the color represents the height (scale in the color￾bar on the right). The corresponding time instants are shown on the left. In our simulation…
Figure 5
Figure 5. Figure 5: (a) and (b) Evolution of the horn length Lhorn normalized by the characteristic length Ldrag for a barchan developed from a conical pile, and for a barchan undergoing flow re￾versal, respectively. (c) and (d) Time evolution of the ratio of the length of the stoss side …
Figure 6
Figure 6. Figure 6: (a) Snapshots showing lateral-view images of an initially developed 2D dune un￾dergoing a flow reversal for case h ( [PITH_FULL_IMAGE:figures/full_fig_p013_6.png]
Figure 7
Figure 7. Figure 7: Snapshots showing the central slice of a barchan dune undergoing a flow reversal. The water flow is from right to left, and the color represents the height (scale in the colorbar on the right). The corresponding time instants are shown on the left. –14– [PITH_FULL_IMA…
Figure 8
Figure 8. Figure 8: Snapshots showing grains being entrained as bedload (red particles) and static (blue) in the central slice of a barchan dune. (a) Development from an initial heap and (b) barchan undergoing a reversal. The corresponding time instants are shown on the left. (c) Cumu￾lat…

Discussion (0). Continue with ORCID to comment.

Reference graph

Works this paper leans on

54 extracted references · 25 canonical work pages

  1. [1]

    \ Franklin, E M

    Alvarez APACrefauthors Alvarez, C A. \ Franklin, E M. APACrefauthors \ 2017 Dec . Birth of a subaqueous barchan dune Birth of a subaqueous barchan dune . Phys. Rev. E 96 062906 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevE.96.062906 APACrefURL APACrefDOI doi:10.1103/PhysRevE.96.062906 APACrefDOI

    work page doi:10.1103/physreve.96.062906 2017

  2. [2]

    \ Franklin, E M

    Alvarez3 APACrefauthors Alvarez, C A. \ Franklin, E M. APACrefauthors \ 2018 Oct . Role of Transverse Displacements in the Formation of Subaqueous Barchan Dunes Role of transverse displacements in the formation of subaqueous barchan dunes . Phys. Rev. Lett. 121 164503 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevLett.121.164503 APACrefURL APACrefD...

    doi:10.1103/physrevlett.121.164503 2018

  3. [3]

    \ Franklin, E M

    Alvarez4 APACrefauthors Alvarez, C A. \ Franklin, E M. APACrefauthors \ 2019 Oct . Horns of subaqueous barchan dunes: A study at the grain scale Horns of subaqueous barchan dunes: A study at the grain scale . Phys. Rev. E 100 042904 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevE.100.042904 APACrefURL APACrefDOI doi:10.1103/PhysRevE.100.042904 APACrefDOI

    doi:10.1103/physreve.100.042904 2019

  4. [4]

    \ Franklin, E M

    Alvarez6 APACrefauthors Alvarez, C A. \ Franklin, E M. APACrefauthors \ 2020 Jan . Shape evolution of numerically obtained subaqueous barchan dunes Shape evolution of numerically obtained subaqueous barchan dunes . Phys. Rev. E 101 012905 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevE.101.012905 APACrefURL APACrefDOI doi:10.1103/PhysRevE.101.01290...

    doi:10.1103/physreve.101.012905 2020

  5. [5]

    \ Franklin, E M

    Alvarez7 APACrefauthors Alvarez, C A. \ Franklin, E M. APACrefauthors \ 2021 . Force distribution within a barchan dune Force distribution within a barchan dune . Phys. Fluids 33 1 013313

    2021

  6. [6]

    , Claudin, P

    Andreotti_1 APACrefauthors Andreotti, B. , Claudin, P. \ Douady, S. APACrefauthors \ 2002 1 . Selection of dune shapes and velocities. Part 1: D ynamics of sand, wind and barchans Selection of dune shapes and velocities. part 1: D ynamics of sand, wind and barchans . Eur. Phys. J. B 28 321-329

    work page 2002

  7. [7]

    , Claudin, P

    Andreotti_2 APACrefauthors Andreotti, B. , Claudin, P. \ Douady, S. APACrefauthors \ 2002 2 . Selection of dune shapes and velocities. Part 2: A two-dimensional model Selection of dune shapes and velocities. part 2: A two-dimensional model . Eur. Phys. J. B 28 341-352

    work page 2002

  8. [8]

    , Fourri\`ere, A

    Andreotti_4 APACrefauthors Andreotti, B. , Fourri\`ere, A. , Ould-Kaddour, F. , Murray, B. \ Claudin, P. APACrefauthors \ 2009 . Giant aeolian dune size determined by the average depth of the atmospheric boundary layer Giant aeolian dune size determined by the average depth of the atmospheric boundary layer . Nature 457 1120-1123

    work page 2009

Show all 54 references
  1. [9]

    , Borges, D S

    Assis3 APACrefauthors Assis, W R. , Borges, D S. \ Franklin, E M. APACrefauthors \ 2023 . Barchan Dunes Cruising Dune-Size Obstacles Barchan dunes cruising dune-size obstacles . Geophys. Res. Lett. 50 14 e2023GL104125 . APACrefURL https://agupubs.onlinelibrary.wiley.com/doi/ab...

    2023 doi

  2. [10]

    \ Franklin, E M

    Assis APACrefauthors Assis, W R. \ Franklin, E M. APACrefauthors \ 2020 . A Comprehensive Picture for Binary Interactions of Subaqueous Barchans A comprehensive picture for binary interactions of subaqueous barchans . Geophys. Res. Lett. 47 18 e2020GL089464

    2020

  3. [11]

    \ Franklin, E M

    Assis2 APACrefauthors Assis, W R. \ Franklin, E M. APACrefauthors \ 2021 . Morphodynamics of Barchan-Barchan Interactions Investigated at the Grain Scale Morphodynamics of barchan-barchan interactions investigated at the grain scale . J. Geophys. Res.: Earth Surf. 126 8 e2021JF006237

    2021

  4. [12]

    , Franklin, E M

    Supplemental2 APACrefauthors Assis, W R. , Franklin, E M. \ Vriend, N M. APACrefauthors \ 2023 . Dataset for ``Evolving dunes under flow reversals: from an initial heap toward inverted dune'' [ D ataset][ S oftware] Dataset for ``evolving dunes under flow reversals: from an in...

    2023 doi

  5. [13]

    , Canizares, P

    bacik2021dynamics APACrefauthors Bacik, K A. , Canizares, P. , Caulfield, C c P. , Williams, M J. \ Vriend, N M. APACrefauthors \ 2021 Oct . Dynamics of migrating sand dunes interacting with obstacles Dynamics of migrating sand dunes interacting with obstacles . Phys. Rev. Flu...

    2021 doi

  6. [14]

    , Caulfield, C c P

    bacik2021stability APACrefauthors Bacik, K A. , Caulfield, C c P. \ Vriend, N M. APACrefauthors \ 2021 Oct . Stability of the Interaction between Two Sand Dunes in an Idealized Laboratory Experiment Stability of the interaction between two sand dunes in an idealized laboratory...

    2021 doi

  7. [15]

    , Lovett, S

    bacik2020wake APACrefauthors Bacik, K A. , Lovett, S. , Caulfield, C c P. \ Vriend, N M. APACrefauthors \ 2020 Feb . Wake Induced Long Range Repulsion of Aqueous Dunes Wake induced long range repulsion of aqueous dunes . Phys. Rev. Lett. 124 054501 . APACrefURL https://link.ap...

    2020 doi

  8. [16]

    APACrefauthors \ 1941

    Bagnold_1 APACrefauthors Bagnold, R A. APACrefauthors \ 1941 . The Physics of Blown Sand and Desert Dunes The physics of blown sand and desert dunes . London Chapman and Hall

    1941

  9. [17]

    APACrefauthors \ 1956

    Bagnold_3 APACrefauthors Bagnold, R A. APACrefauthors \ 1956 . The flow of cohesionless grains in fluids The flow of cohesionless grains in fluids . Philos. Trans. R. Soc. Lond. Ser. A 249 235-297

    1956

  10. [18]

    , Kloss, C

    Berger APACrefauthors Berger, R. , Kloss, C. , Kohlmeyer, A. \ Pirker, S. APACrefauthors \ 2015 . Hybrid parallelization of the LIGGGHTS open-source DEM code Hybrid parallelization of the LIGGGHTS open-source DEM code . Powder Technology 278 234-247

    2015

  11. [19]

    APACrefauthors \ 2006

    Charru_3 APACrefauthors Charru, F. APACrefauthors \ 2006 . Selection of the ripple length on a granular bed sheared by a liquid flow Selection of the ripple length on a granular bed sheared by a liquid flow . Phys. Fluids 18 121508

    2006

  12. [20]

    \ Andreotti, B

    Claudin_Andreotti APACrefauthors Claudin, P. \ Andreotti, B. APACrefauthors \ 2006 . A scaling law for aeolian dunes on M ars, V enus, E arth, and for subaqueous ripples A scaling law for aeolian dunes on M ars, V enus, E arth, and for subaqueous ripples . Earth Plan. Sci. Let...

    2006

  13. [21]

    APACrefauthors \ 2015

    Courrech APACrefauthors Courrech du Pont , S. APACrefauthors \ 2015 . Dune morphodynamics Dune morphodynamics . C. R. Phys. 16 1 118 - 138

    2015

  14. [22]

    , Schw\"ammle, V

    Duran2 APACrefauthors Dur\'an, O. , Schw\"ammle, V. \ Herrmann, H. APACrefauthors \ 2005 Aug . Breeding and solitary wave behavior of dunes Breeding and solitary wave behavior of dunes . Phys. Rev. E 72 021308 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevE.72.021308 AP...

    2005 doi

  15. [23]

    , Claudin, P

    Elbelrhiti APACrefauthors Elbelrhiti, H. , Claudin, P. \ Andreotti, B. APACrefauthors \ 2005 . Field evidence for surface-wave-induced instability of sand dunes Field evidence for surface-wave-induced instability of sand dunes . Nature 437 04058

    2005

  16. [24]

    APACrefauthors \ 2011

    Franklin_5 APACrefauthors Franklin, E M. APACrefauthors \ 2011 . Nonlinear instabilities on a granular bed sheared by a turbulent liquid flow Nonlinear instabilities on a granular bed sheared by a turbulent liquid flow . J. Braz. Soc. Mech. Sci. Eng. 33 265-271

    2011

  17. [25]

    APACrefauthors \ 2015

    Franklin_12 APACrefauthors Franklin, E M. APACrefauthors \ 2015 . Formation of sand ripples under a turbulent liquid flow Formation of sand ripples under a turbulent liquid flow . Appl. Math. Model. 39 23 7390-7400

    2015

  18. [26]

    \ Charru, F

    Franklin_8 APACrefauthors Franklin, E M. \ Charru, F. APACrefauthors \ 2011 . Subaqueous barchan dunes in turbulent shear flow. P art 1. D une motion Subaqueous barchan dunes in turbulent shear flow. P art 1. D une motion . J. Fluid Mech. 675 199-222

    2011

  19. [27]

    , Narteau, C

    Gao APACrefauthors Gao, X. , Narteau, C. \ Gadal, C. APACrefauthors \ 2021 . Migration of Reversing Dunes Against the Sand Flow Path as a Singular Expression of the Speed-Up Effect Migration of reversing dunes against the sand flow path as a singular expression of the speed-up...

    2021 doi

  20. [28]

    , Kloss, C

    Goniva APACrefauthors Goniva, C. , Kloss, C. , Deen, N G. , Kuipers, J A M. \ Pirker, S. APACrefauthors \ 2012 . Influence of rolling friction on single spout fluidized bed simulation Influence of rolling friction on single spout fluidized bed simulation . Particuology 10 5 582-591

    2012

  21. [29]

    , Wierschem, A

    Groh1 APACrefauthors Groh, C. , Wierschem, A. , Aksel, N. , Rehberg, I. \ Kruelle, C A. APACrefauthors \ 2008 Aug . Barchan dunes in two dimensions: Experimental tests for minimal models Barchan dunes in two dimensions: Experimental tests for minimal models . Phys. Rev. E 78 0...

    2008 doi

  22. [30]

    , Niiya, H

    Guignier APACrefauthors Guignier, L. , Niiya, H. , Nishimori, H. , Lague, D. \ Valance, A. APACrefauthors \ 2013 May . Sand dunes as migrating strings Sand dunes as migrating strings . Phys. Rev. E 87 052206 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevE.87.052206 APAC...

    2013 doi

  23. [31]

    \ Sauermann, G

    Herrmann_Sauermann APACrefauthors Herrmann, H J. \ Sauermann, G. APACrefauthors \ 2000 . The shape of dunes The shape of dunes . Physica A (Amsterdam) 283 24-30

    2000

  24. [32]

    APACrefauthors \ 2004

    Hersen_3 APACrefauthors Hersen, P. APACrefauthors \ 2004 . On the crescentic shape of barchan dunes On the crescentic shape of barchan dunes . Eur. Phys. J. B 37 4 507--514

    2004

  25. [33]

    , Andersen, K H

    Hersen_2 APACrefauthors Hersen, P. , Andersen, K H. , Elbelrhiti, H. , Andreotti, B. , Claudin, P. \ Douady, S. APACrefauthors \ 2004 Jan . Corridors of barchan dunes: Stability and size selection Corridors of barchan dunes: Stability and size selection . Phys. Rev. E 69 01130...

    2004 doi

  26. [34]

    , Douady, S

    Hersen_1 APACrefauthors Hersen, P. , Douady, S. \ Andreotti, B. APACrefauthors \ 2002 Dec . Relevant Length Scale of Barchan Dunes Relevant length scale of barchan dunes . Phys. Rev. Lett. 89 264301 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevLett.89.264301 APACrefURL...

    2002 doi

  27. [35]

    , Bacik, K

    jarvis2022coarsening APACrefauthors Jarvis, P. , Bacik, K. , Narteau, C. \ Vriend, N. APACrefauthors \ 2022 . Coarsening dynamics of 2D subaqueous dunes Coarsening dynamics of 2D subaqueous dunes . Journal of Geophysical Research: Earth Surface 127 2 e2021JF006492

    2022

  28. [36]

    \ Sotiropoulos, F

    Khosronejad APACrefauthors Khosronejad, A. \ Sotiropoulos, F. APACrefauthors \ 2017 . On the genesis and evolution of barchan dunes: morphodynamics On the genesis and evolution of barchan dunes: morphodynamics . J. Fluid Mech. 815 117--148

    2017

  29. [37]

    \ Uhlmann, M

    Kidanemariam APACrefauthors Kidanemariam, A G. \ Uhlmann, M. APACrefauthors \ 2014 . Direct numerical simulation of pattern formation in subaqueous sediment Direct numerical simulation of pattern formation in subaqueous sediment . J. Fluid Mech. 750 R2

    2014

  30. [38]

    \ Goniva, C

    Kloss APACrefauthors Kloss, C. \ Goniva, C. APACrefauthors \ 2010 . LIGGGHTS : a new open source discrete element simulation software LIGGGHTS : a new open source discrete element simulation software . Proc. 5th Int. Conf. on Discrete Element Methods. Proc. 5th int. conf. on d...

    2010

  31. [39]

    , Fischer, S

    Kroy_B APACrefauthors Kroy, K. , Fischer, S. \ Obermayer, B. APACrefauthors \ 2005 . The shape of barchan dunes The shape of barchan dunes . J. Phys. Condens. Matter 17 S1229-0S1235

    2005

  32. [40]

    , Sauermann, G

    Kroy_A APACrefauthors Kroy, K. , Sauermann, G. \ Herrmann, H J. APACrefauthors \ 2002 1 Sep . Minimal model for aeolian sand dunes Minimal model for aeolian sand dunes . Phys. Rev. E 66 031302 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevE.66.031302 APACrefURL APACrefD...

    2002 doi

  33. [41]

    , Sauermann, G

    Kroy_C APACrefauthors Kroy, K. , Sauermann, G. \ Herrmann, H J. APACrefauthors \ 2002 2 Jan . Minimal Model for Sand Dunes Minimal model for sand dunes . Phys. Rev. Lett. 88 054301 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevLett.88.054301 APACrefURL APACrefDOI doi:10...

    2002 doi

  34. [42]

    , Assis, W R

    Lima2 APACrefauthors Lima, N C. , Assis, W R. , Alvarez, C A. \ Franklin, E M. APACrefauthors \ 2022 . Grain-scale computations of barchan dunes Grain-scale computations of barchan dunes . Phys. Fluids 34 12 123320 . APACrefURL https://doi.org/10.1063/5.0121810 APACrefURL APAC...

    2022 doi

  35. [43]

    \ M\" u ller, R

    Mueller APACrefauthors Meyer-Peter, E. \ M\" u ller, R. APACrefauthors \ 1948 . Formulas for bed-load transport Formulas for bed-load transport . Proc. 2nd Meeting of International Association for Hydraulic Research Proc. 2nd meeting of international association for hydraulic ...

    1948

  36. [44]

    , Kok, J F

    Pahtz_1 APACrefauthors P\"ahtz, T. , Kok, J F. , Parteli, E J R. \ Herrmann, H J. APACrefauthors \ 2013 . Flux Saturation Length of Sediment Transport Flux saturation length of sediment transport . Phys. Rev. Lett. 111 218002

    2013

  37. [45]

    , Andrade, J S

    Parteli3 APACrefauthors Parteli, E J R. , Andrade, J S. \ Herrmann, H J. APACrefauthors \ 2011 Oct . Transverse Instability of Dunes Transverse instability of dunes . Phys. Rev. Lett. 107 188001 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevLett.107.188001 APACrefURL AP...

    2011 doi

  38. [46]

    , Dur \'a n, O

    Parteli4 APACrefauthors Parteli, E J R. , Dur \'a n, O. , Bourke, M C. , Tsoar, H. , P \"o schel, T. \ Herrmann, H. APACrefauthors \ 2014 . Origins of barchan dune asymmetry: Insights from numerical simulations Origins of barchan dune asymmetry: Insights from numerical simulat...

    2014

  39. [47]

    , Dur\'an, O

    Parteli APACrefauthors Parteli, E J R. , Dur\'an, O. \ Herrmann, H J. APACrefauthors \ 2007 Jan . Minimal size of a barchan dune Minimal size of a barchan dune . Phys. Rev. E 75 011301 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevE.75.011301 APACrefURL APACrefDOI doi:1...

    2007 doi

  40. [48]

    , Durán, O

    Parteli6 APACrefauthors Parteli, E J R. , Durán, O. , Tsoar, H. , Schwämmle, V. \ Herrmann, H J. APACrefauthors \ 2009 . Dune formation under bimodal winds Dune formation under bimodal winds . Proc. Natl. Acad. Sci. U.S.A. 106 52 22085-22089

    2009

  41. [49]

    \ Herrmann, H J

    Parteli2 APACrefauthors Parteli, E J R. \ Herrmann, H J. APACrefauthors \ 2007 Oct . Dune formation on the present Mars Dune formation on the present mars . Phys. Rev. E 76 041307 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevE.76.041307 APACrefURL APACrefDOI doi:10.110...

    2007 doi

  42. [50]

    , Rognon, P

    Sauermann_1 APACrefauthors Sauermann, C. , Rognon, P. , Poliakov, A. \ Herrmann, H J. APACrefauthors \ 2000 . The shape of the barchan dunes of S outhern M orocco The shape of the barchan dunes of S outhern M orocco . Geomorphology 36 47-62

    2000

  43. [51]

    , Kroy, K

    Sauermann_4 APACrefauthors Sauermann, G. , Kroy, K. \ Herrmann, H J. APACrefauthors \ 2001 Aug . Continuum saltation model for sand dunes Continuum saltation model for sand dunes . Phys. Rev. E 64 031305 . APACrefURL https://link.aps.org/doi/10.1103/PhysRevE.64.031305 APACrefU...

    2001 doi

  44. [52]

    \ Herrmann, H J

    Schwammle APACrefauthors Schw \"a mmle, V. \ Herrmann, H J. APACrefauthors \ 2005 . A model of Barchan dunes including lateral shear stress A model of barchan dunes including lateral shear stress . Eur. Phys. J. E 16 1 57-65

    2005

  45. [53]

    \ Franklin, E M

    Wenzel APACrefauthors Wenzel, J L. \ Franklin, E M. APACrefauthors \ 2019 . Velocity fields and particle trajectories for bed load over subaqueous barchan dunes Velocity fields and particle trajectories for bed load over subaqueous barchan dunes . Granular Matter 21 321-334

    2019

  46. [54]

    , Yang, X

    Zhang_D APACrefauthors Zhang, D. , Yang, X. , Rozier, O. \ Narteau, C. APACrefauthors \ 2014 . Mean sediment residence time in barchan dunes Mean sediment residence time in barchan dunes . J. Geophys. Res.: Earth Surf. 119 3 451--463

    2014

Pith tools

Reviewed August 15, 2026 · model on record in the stance chip above.