REVIEW 4 major objections 4 minor 44 references
An unsupervised workflow turns submarine fiber-optic DAS recordings into fin whale note detections, characterizations, and locations, with median pick-level precision of 0.990.
Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →
T0 review · deepseek-v4-flash
2026-08-04 08:08 UTC pith:JY2IA2RC
load-bearing objection Useful integrated DAS workflow for fin whale notes with credible detection numbers, but the localization and movement claims outrun the validation. the 4 major comments →
An End-to-End Workflow for Fin Whale Song Detection, Note Characterization, and Localization with Distributed Acoustic Sensing
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The central discovery is that a multi-stage signal-processing chain—a kurtosis-based picker adapted with a Morlet wavelet, density-based spatio-temporal clustering, cluster agglomeration, hyperbolic arrival-time fitting, and grid-search localization—can extract biologically interpretable note-level information from raw DAS strain records. The hyperbolic fitting rejects incoherent picks, yielding validated clusters whose features support note-type discrimination, and whose relative arrival times produce matching-score maps of the source. The evaluation against manual annotations shows that the method is both precise and transferable across two different cable geometries.
What carries the argument
The key machinery is the hyperbolic arrival-time model t(d)^2 = t0^2 + (d-d0)^2/v_app^2, which links each note to a localized source and drives both the rejection of incoherent picks and the grid-search localization. Around it sit the kurtosis-value picker (KVP) with a Morlet wavelet for narrow-band detection, DBSCAN plus hierarchical agglomeration to group channel-wise picks, and a spectrogram-based feature extractor producing centroids, spreads, slopes, and SNR. The matching score M = 1/(1+epsilon^2) converts arrival-time residuals into a spatial map of candidate source positions.
Load-bearing premise
The load-bearing premise is that every fin whale note generates a single hyperbolic arrival-time pattern on the DAS array with a constant apparent velocity; if multipath propagation, depth changes, or variable cable coupling break that hyperbola, the clustering validation and localization results become unreliable.
What would settle it
A controlled test would be to record a fin whale with a collocated hydrophone array and a DAS cable, localize the caller with the hydrophones, and check whether the DAS-derived matching-score peak coincides with the true location; if the peak is systematically offset or the hyperbola residuals are large in a sizable fraction of notes, the central claim is weakened.
If this is right
- DAS-equipped submarine cables can serve as continuous passive acoustic monitors for fin whales without labelled training data.
- Note-level features enable estimation of inter-note intervals for AA, AB, BA, BB sequences, allowing song-structure and population studies.
- Sequential localization of notes yields apparent swimming speed and direction, with estimates in this paper around 3.3–6.5 km/h, consistent with known behavior.
- The workflow is transferable to hydrophone arrays, cabled observatories, or OBS networks with minor adaptation.
- Overlapping vocalizations from two individuals can be separated when their hyperbola apices differ, as demonstrated on a 15 January 2024 recording.
Where Pith is reading between the lines
- If the hyperbolic assumption holds, the same pipeline could track individual whales over longer timescales by linking cluster apices, a step the paper leaves for future work.
- The matching-score maps, though not calibrated uncertainties, could be used to design better cable geometries (curved or multi-cable) to remove the bilateral ambiguity—an extension hinted but not pursued.
- The feature set might generalize to other pulsed low-frequency tonal calls (e.g., sei or Bryde's whales) if the wavelet scale and frequency band are adjusted; this is an untested extrapolation.
- A natural stress test is to apply the workflow to a dataset with known ground-truth positions (e.g., tagged whales) to calibrate localization accuracy, which the current evaluation does not do.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents an end-to-end, unsupervised workflow for detecting, characterizing, and localizing fin whale notes in distributed acoustic sensing (DAS) data from two submarine telecom cables. The pipeline adapts the kurtosis-value picker (KVP) with a Morlet wavelet for narrow-band note detection, groups channel-wise picks via DBSCAN and agglomeration, fits a hyperbolic moveout model to reject outliers, extracts temporal/spectral/energy features for note typing, and applies a grid-search relative-arrival-time method to produce matching-score maps for source localization. Detection is evaluated against manual annotations from six fin whale songs, reporting median pick-level precision 0.990 and recall 0.744, and cluster-level precision 0.880 and recall 0.806. Representative examples illustrate overlapping-song separation, type-A/B characterization, and inference of apparent source movement at speeds of 3.31 and 6.48 km/h.
Significance. If the results hold, the workflow is a useful contribution to DAS-based marine mammal monitoring: it is fully unsupervised, interpretable, open-source, and demonstrated on two real-world cable deployments with contrasting geometry and noise conditions. A notable strength is that the detection stage does not require labeled training data, and the code is publicly available. The paper also correctly limits some claims, noting that score maps are not calibrated uncertainty. However, the two most consequential claims—transferable detection performance and localization/movement inference—currently rest on thinner evidence: the metrics are computed on the same data used to tune the pipeline, and the localization stage has no independent validation. These gaps need to be addressed before the paper's conclusions can be taken at face value.
major comments (4)
- [Sec. 4.1 and Table 1] The detection metrics (median pick precision 0.990, recall 0.744; cluster precision 0.880, recall 0.806) are reported on the same six songs that were presumably used to develop and tune the KVP settings and clustering parameters. There is no held-out set or cross-validation, so the reported numbers likely overestimate performance on new recordings. This is load-bearing for the paper's 'transferability' claim over two datasets. Please provide an explicit train/test split or cross-validation, or clearly state which parameters were fixed a priori and which were tuned on these six songs.
- [Sec. 3.2 (DBSCAN and agglomeration parameters)] The spatio-temporal clustering stage depends on several parameters that are not reported: DBSCAN neighborhood radius eps, min_samples, temporal/spatial agglomeration margins, and the hyperbolic-fit outlier residual threshold. Table 1 lists only the KVP/Morlet settings. Without these values (or a pointer to a configuration file in the GitHub repository), the workflow cannot be reproduced or adapted to other DAS arrays. Please include a complete parameter table or cite the exact configuration in the open-source code.
- [Sec. 4.3 and Sec. 5.3 (localization and movement inference)] The abstract claims 'inference of apparent source movement,' but the localization results are not validated against any independent ground truth, synthetic test, or known source position. The method assumes a constant sound speed of 1500 m/s, a fixed source depth, and a horizontal propagation path (Sec. 3.4), and the clustering/outlier rejection already assumes a single-hyperbola moveout with constant v_app (Eq. 2). The paper's own Sec. 5.3 states that score maps 'should not be interpreted as calibrated localization uncertainty.' Without validation, the reported swimming speeds of 3.31 and 6.48 km/h could be artifacts of the assumed propagation model rather than true whale motion. Please add a quantitative validation (e.g., synthetic waveforms, a known source, or a comparison with independent tracking) or explicitly reframe the movement claims as model-dependent 'apparent' displacements
- [Sec. 3.2, Eq. (2) and Sec. 2 (bathymetry)] The hyperbolic moveout model in Eq. (2) is central to both clustering and localization, but the cables are not straight: Fig. 1 shows bathymetric variations and curvature. If the along-fiber distance d differs from the straight-line distance to the source, the arrival-time pattern may deviate from a pure hyperbola, affecting both outlier rejection and the grid-search localization. The paper does not quantify this error or test the sensitivity of clustering/localization to cable geometry. Please add a sensitivity analysis or at least a clear statement of the geometric assumptions and their expected impact on the reported results.
minor comments (4)
- [Sec. 3.1] Typo: 'KPV' should be 'KVP' in the second paragraph ('In the present study, KPV was adapted').
- [Sec. 3.3] Typo: 'spectrogram chacracteristics' -> 'spectrogram characteristics'; also 'descrptors' in Sec. 4.2 and 'reatining' in Sec. 5.1.
- [Sec. 5.3 / Fig. 8 caption] The phrase 'adirectly' in Sec. 5.3 is a typo, and Fig. 8 caption contains '99 th percentile os each' — should be 'of each'.
- [Sec. 3.3, Eq. (6)] The dimensionless factor σ is set to 1.5, which is described as defining the signal support. It would help to state explicitly that this value was chosen by visual inspection and whether the features are sensitive to it.
Circularity Check
No significant circularity; detection metrics are benchmarked against manual annotations and the localization model's limits are explicitly stated.
full rationale
The derivation chain is not circular. The detection stage (KVP adapted with a Morlet wavelet) is evaluated against manually annotated KVP picks from six fin whale songs, yielding precision/recall figures that are independent of the algorithm's own outputs. The clustering and hyperbolic fitting around Eq. 2 are used to reject incoherent picks, and the retained clusters are subsequently fed into note characterization and localization; no parameter is fitted and then reported as an independent prediction of itself. The localization step (Sec. 3.4, Eqs. 7-8) is an explicit grid-search inversion under stated assumptions (fixed source depth, constant 1500 m/s sound speed), and the paper itself cautions that the matching-score maps 'should not be interpreted as calibrated localization uncertainty.' Thus the apparent-movement inference is a model-dependent interpretation, not a circular derivation. Self-citations to Latorre et al. 2025 (KVP) and Diego-Tortosa et al. 2025 (spectrogram configurations) provide algorithms or standard time-frequency trade-offs; they are not used as unverified premises to force the paper's conclusions, and the main detection claim is externally benchmarked. The principal weakness, lack of independent ground-truth positions for localization, is a validation gap rather than a circularity.
Axiom & Free-Parameter Ledger
free parameters (9)
- KVP wavelet and detection settings (max frequency, octaves, voices, center cycles, jump threshold, min gap, n bands, Mor =
25 Hz, 1 octave, 10 voices/oct, 150.0, 2.0, 1.0 s, 22, 5.3364
- Frequency selection band limits =
15–30 Hz, max 4 bands
- DBSCAN neighborhood radius (eps)
- DBSCAN min_samples
- Cluster agglomeration margins
- Hyperbolic fit outlier residual threshold
- Localization grid extent and spacing =
6x6 km, 25 m
- Assumed sound speed and source depth =
1500 m/s, upper 50 m
- Feature extraction sigma =
1.5
axioms (6)
- domain assumption Hyperbolic arrival-time model (Eq. 2) holds for fin whale notes on a linear DAS array.
- domain assumption Constant sound speed of 1500 m/s in seawater.
- domain assumption Fin whale notes are narrow-band between 15 and 30 Hz.
- domain assumption Fin whales vocalize from the upper 50 m of the water column.
- standard math KVP and DBSCAN algorithms function as described in their source papers.
- ad hoc to paper Manual annotations of six songs are correct ground truth.
read the original abstract
Submarine fiber-optic cables instrumented with distributed acoustic sensing (DAS) provide an effective approach for large-scale monitoring of fin whales. We present an end-to-end workflow for detecting, characterizing, and localizing fin whale notes, tested on two submarine telecom cables in the Strait of Gibraltar and western Alboran Sea. The workflow applies a kurtosis-value picker adapted to narrow-band fin whale notes. Channel-wise detections are grouped into individual notes using density-based spatio-temporal clustering, cluster agglomeration, and hyperbolic fitting to reject incoherent picks. The retained clusters are characterized through temporal, spectral, and energy-related descriptors that support note-type discrimination and estimation of inter-note intervals. Relative arrival times across DAS channels are then used in a grid-search procedure to estimate candidate source locations. Evaluation against manually annotated detections from six fin whale songs yielded median pick-level precision of 0.990 and recall of 0.744, and median cluster-level precision of 0.880 and recall of 0.806. Representative applications demonstrate separation of overlapping vocalizations, characterization of type-A and type-B notes, and the inference of apparent source movement. By transforming dense DAS recordings into compact note-level bioacoustic information, the workflow provides an integrated framework for fin whale monitoring and a basis for adaptation to other synchronized acoustic receiver arrays.
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