Articles | Volume 13, issue 4
https://doi.org/10.5194/esurf-13-531-2025
https://doi.org/10.5194/esurf-13-531-2025
Research article
 | 
08 Jul 2025
Research article |  | 08 Jul 2025

Sediment aggradation rates in Himalayan rivers revealed through the InSAR differential residual topographic phase

Jingqiu Huang and Hugh D. Sinclair

Data sets

C-Band Synthetic Aperture Radar Ground Range Detected, Log Scaling|Earth Engine Data Catalog|Google for Developers Sentinel-1 SAR GRD https://developers.google.com/earth-engine/datasets/catalog/COPERNICUS_S1_GRD

Model code and software

dawiedotcom/sar\_extract_timeseries: v0.1.0 D. De Klerk https://doi.org/10.5281/zenodo.13222094

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Short summary
We develop a novel approach based on satellite radar images to quantify millimetre-scale sedimentation during monsoon floods over a 15 km stretch of four rivers, from the Himalayan mountain front to the gravel–sand transition. The results show how sediment accumulates more rapidly near the mountain front and decreases downstream, while the floodplain sinks. This method can improve river monitoring, enhance flood prediction, and benefit communities at risk of flooding in Nepal and India. 
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