What question did this study set out to answer?

Assess whether satellite C-band radar interferometric coherence change detection can accurately identify and track catchment-scale gully and surface erosion dynamics.

March 24, 2023Remote Sensing of EnvironmentOpen Access

Monitoring erosion in tropical savannas from C-band radar coherence

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Authors

PCPascal CastellazziCommonwealth Scientific and Industrial Research Organisation SKSana KhanCSIRO Land and Water SWSimon J. WalkerCommonwealth Scientific and Industrial Research Organisation

Discussion

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Implication

Remote sensing analysis demonstrates satellite radar coherence detects gully erosion across tropical savannas, highlighting a scalable approach to guide catchment sediment mitigation.

Key Points

Assess whether satellite C-band radar interferometric coherence change detection can accurately identify and track catchment-scale gully and surface erosion dynamics.
Subdivided multitemporal Sentinel-1 C-band radar coherence imagery using rain gauge time series to decouple erosion-rich periods from erosion-free baseline coherence.
Cross-validated corrected coherence maps against multitemporal airborne LiDAR differential elevation models, regional gully mapping, gullying potential indices, and in-situ field verification.
Coherence change detection reliably identified erosion and deposition zones within broad gully morphologies, though radar line-of-sight constraints prevented signal penetration into narrow linear gullies.
The method detected fine-scale sheetwash and rill erosion occurring in areas vulnerable to gully expansion that remained beneath the vertical detection thresholds of repeat airborne LiDAR surveys.

Cite This Study

Castellazzi et al. (2023) studied this question.

synapsesocial.com/papers/6a199e1de7f8932c5eea79d0 https://doi.org/10.1016/j.rse.2023.113546

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Implication

Remote sensing analysis demonstrates satellite radar coherence detects gully erosion across tropical savannas, highlighting a scalable approach to guide catchment sediment mitigation.