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Abstract This study uses geospatial technique to analyze the spatio-temporal changes of West Rapti River Channel from 1990 to 2023, to assess their impact in Deukhuri Valley. Using freely available Landsat satellite imagery we extracted water surface features through the Normalized Difference Water Index (NDWI) and generated 27 cross-sections (CS) to track channel shift. The results indicated the significant shifts, notably 1426.97 m northeast shift in CS-23 and 718.55 m south shift in CS-25 attributed to sand deposition during flooding. Nearly no shifting impact was observed from CS-12 to CS-17 showing embankment and mitigation efforts being effective within this range. Study shows river is naturally multi-channeled and exhibits braided planform with sinuosity index values ranging from 1.02 to 1.38, indicating highly braided during 2010 and 2015. The river channel was found to be driven by a high sediment deposit of about 15.35 Sq. km across the 53 km range. These results are crucial for formulating integrated river basin management plans in the West Rapti River basin laying foundation for future research to explore sustainable management practices in the future.
Gharti et al. (Thu,) studied this question.
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