首页|A synergic approach using the model and remote sensing data for flood monitoring in under-observed transboundary rivers

A synergic approach using the model and remote sensing data for flood monitoring in under-observed transboundary rivers

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  • NETL
  • NSTL
  • Iwa Publishing
The southern plain of Nepal recognized as the 'granary of Nepal', confronts recurrent monsoon-induced flooding, posing a substantial threat to its pivotal role as a major agricultural contributor to the national economy. As an analysis, this study employs advanced satellite imagery to delineate historical floods in nine flood-prone transboundary basins and compares the rainfall-induced model-based inundation in the West Rapti Basin (WRB) to validate the result. The extent of flooding was mapped between 2015 and 2022 using Sentinel-1 Synthetic Aperture Radar data processed on Google Earth Engine. Hydrodynamic modelling centred on the WRB, incorporated daily measured precipitation data with varying return periods over a 10 m resolution digital elevation model generated through an in situ survey. The model was calibrated for the August 2017 flood event with Nash-Sutcliffe efficiency greater than 70% and validation reasonably with satellite-derived flood maps with Cohen's Kappa value of 0.58 and an overall accuracy metric of 0.84. This synergic approach integrates climatology, remote sensing data, and hydraulics to monitor transboundary river floods in Nepal where precise hydro-meteorological data are limited, thus, offering continuous all-weather monitoring.

flood inundationhydraulic modellingmultidisciplinary approachsatellite imagetransboundary rivers

Suraj Lamichhane、Nischal Karki、Vishnu Prasad Pandey、Pradhumna Joshi、Sarita Dawadi

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Center for Disaster Studies, Institute of Engineering, Tribhuvan University, Lalitpur, Nepal

Department of Civil Engineering, Pulchowk Campus, Institute of Engineering, Tribhuvan University, Lalitpur, Nepal||Center for Water Resources Studies, Institute of Engineering, Tribhuvan University, Lalitpur, Nepal

Center for Disaster Studies, Institute of Engineering, Tribhuvan University, Lalitpur, Nepal||Center for Water Resources Studies, Institute of Engineering, Tribhuvan University, Lalitpur, Nepal

Water Resources Research and Development Center (WRRDC), Government of Nepal, Lalitpur, Nepal

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2024

10.2166/hydro.2024.056

Journal of hydroinformatics

Journal of hydroinformatics

SCI
ISSN：1464-7141
年,卷(期)：2024.26(10/12)
  • 55