Abstract
A flood is an overtopping of water from channel banks which submerges land which is usually dry. In India, floods in Godavari and Sabari River are observed several times but 2006 flood was one of the severe event which affected Khammam district extensively. The present paper demonstrates the analysis of severe flood of Khammam using hydraulic modeling. For this purposeHEC-RAS 2D a Hydraulic model was used to simulate the behavior of study area which covers part of Godavari river and Sabari River in Telangana and Andhra Pradesh states. Model provides detail temporal simulated parameters like depth of water, water elevation with respect to M.S.L and Velocity of flowing water. SRTM 30m posting, river discharge data, LULC for assigning Roughness coefficient was used as input to the model. HEC-RAS Simulated flood results were validated with remotely sensed Radarsat satellite observations. Performance of HEC-RAS model was evaluated according to the criteria of measure of fitting raster cells with satellite data. Validation results showed that performance of HEC-RAS model is very effective and can be used by hydrologist or water resources engineers for planning and development. , , , ,
Highlights
Floods are one of the major natural disasters affecting the South-Asian region
The study area of Godavari river stretch is about 186.6 km and Sabari river stretch is about 37.07 km
For present study, simulated results for 07 Aug 2006 at 08.00 hours was taken into consideration for validating with RADARSAT satellite image acquired on same date and time Figure 6 shows the RADARSAT image and its derived flood extent
Summary
Floods are one of the major natural disasters affecting the South-Asian region. India and Bangladesh are two from eight South-Asian countries which are reported to be worst affected countries in the world, accounting to be 1/5th of global death count due to floods (Agarwal and Sunita, 1991). In order to develop flood hazard and risk zone maps and to know the temporal behaviour of flood event it is essential to simulate the flood inundation by numerical models. The studies of Flood inundation modelling using hydrodynamic models approach for designing river engineering and irrigation schemes and mapping flood risks has been carried out by various researchers worldwide (Werner, 2004; Bates et al, 2005; Patro et al, 2009). SOBEK developed at the Delft Hydraulics, Delft have been developed for floodplain delineation and flow simulation to delineate the floodplain zones and calculate the associated risk. All these models have capability to solve 1D and 2D equations. The study goal is to analyze the 2006 flood event of part of Godavari and Sabari river north eastern part of Telangana
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