Abstract
In order for the Indian government to maximize Integrated Water Resource Management (IWRM), the Brahmaputra River has played an important role in the undertaking of the Pilot Basin Study (PBS) due to the Brahmaputra River’s annual regional flooding. The selected Kulsi River—a part of Brahmaputra sub-basin—experienced severe floods in 2007 and 2008. In this study, the Rainfall-Runoff-Inundation (RRI) hydrological model was used to simulate the recent historical flood in order to understand and improve the integrated flood risk management plan. The ultimate objective was to evaluate the sensitivity of hydrologic simulation using different Digital Elevation Model (DEM) resources, coupled with DEM smoothing techniques, with a particular focus on the comparison of river discharge and flood inundation extent. As a result, the sensitivity analysis showed that, among the input parameters, the RRI model is highly sensitive to Manning’s roughness coefficient values for flood plains, followed by the source of the DEM, and then soil depth. After optimizing its parameters, the simulated inundation extent showed that the smoothing filter was more influential than its simulated discharge at the outlet. Finally, the calibrated and validated RRI model simulations agreed well with the observed discharge and the Moderate Imaging Spectroradiometer (MODIS)-detected flood extents.
Highlights
Integrated Water Resource Management (IWRM) was developed and increasingly recognized to meet urgent international and national demand for the effective and efficient management of water resources under climate change
Keeping the importance of IWRM in view, the National Institute of Hydrology (NIH), a premier Indian institute in the area of hydrology and water resources, set up regional centers for conducting studies related to field problems and to develop a closer interaction with water resource management organizations across different regions of the country
Under the mandate of the XII plan period, the center is working on a project in IWRM under the Pilot Basin Study (PBS)
Summary
Integrated Water Resource Management (IWRM) was developed and increasingly recognized to meet urgent international and national demand for the effective and efficient management of water resources under climate change. Keeping the importance of IWRM in view, the National Institute of Hydrology (NIH), a premier Indian institute in the area of hydrology and water resources, set up regional centers for conducting studies related to field problems and to develop a closer interaction with water resource management organizations across different regions of the country. One such regional center was set up at Guwahati, India for the northeastern region to tackle various water resource problems of seven northeast states, including Sikkim and parts of West Bengal. Under the mandate of the XII plan period, the center is working on a project in IWRM under the Pilot Basin Study (PBS)
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