HYDRODYNAMIC MODELING OF KRISHNA RIVER FOR THE ASSESSMENT OF FLOOD AFFECTED AREAS USING REMOTE SENSING AND GISKiran Yarrakula, K.S. Kumar and G. Samrat
Krishna River is one of the longest interstate flowing rivers of India, about 1400 km length, extended in 258948 km² area, equivalent to 8% of total geographical area of the country. In the present study, one dimensional hydrodynamic model (HEC-RAS) was used to model the flood events of Krishna River in the years 1998, 2006 and 2009. Calibration and Validation of hydrodynamic model was carried out by assessing the model performance with Mannings roughness coefficient by considering the values for the channel and floodplain as 0.047 and 0.11 respectively. The performance of hydrodynamic model is premeditated using Nash-Sutcliffe coefficient, index of agreement, percentage of deviation in the peak, and R2. Flood inundation mapping and digital elevation model (DEM) have also been generated from Shuttle Radar Topography Mission (SRTM) by extracting 113 river cross sections from DEM and are compared with those of measured and field surveys. In addition, damage assessment of flood affected areas was also carried out using Landsat-7 with ETM+ sensor. The results indicated that more damage occurred to agriculture land followed by habitats.
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