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Title: Flood inundation modelling using coupled 1 D and 2 D Hydro-Dynamic modelling
Authors: Patra, Jagdish Prasad
Kumar, Rakesh
Mani, Pankaj
Sapra, Tilak Raj
Issue Date: Jun-2018
Publisher: NISCAIR-CSIR, India
Abstract: Flood is an overflow of water resulting submerges of land which is usually dry. There are many sources of flooding viz. river flooding, coastal flooding, surface water flooding, drain and sewer flooding, groundwater flooding etc. Whatever be the type of flooding it causes mass demolition of properties and affected human lives. This study envisages identification of various flooding sources, estimation of maximum floods and their routing through drainage system for a proposed industrial site. The digital elevation model (DEM) is developed for the study area from GPS points, 0-5 m interval contour map for the proposed industrial area and levels and contours extracted from survey of India topographical maps for the surrounding area. The L-moments based rainfall frequency analysis has been performed to estimate 1 day maximum rainfall for various return periods. The synthetic unit hydrographs are derived from catchment characteristics of the study area and flood hydrographs for 10, 25, 50 and 100 year return periods are computed. The two major source of flooding are: flow in the drain and rainfall induced catchment flooding are modelled using MIKE FLOOD package (a coupled 1D and 2-D flow analysis system). Flow through the drainage system from upstream catchment is modelled in 1-D MIKE 11 with a space interval of 100 m to get accurate representation of the drainage network. The bathymetry of the flood plain around the plant site at 5 m grid size is created from DEM in the 2-D modelling in MIKE-21. Local rainfall over the proposed industrial site is also modelled in the MIKE-21. The spills from drainage network due to upstream catchment flow and local rainfall are simulated in coupled MILE-11 and MIKE-21 i.e., MIKE FLOOD package- Various scenarios of flooding like flow in the drain and with and without rainfall of different return periods in the project site are simulated to develop corresponding flood inundation maps. Various other parameters like flood extent, depth, leve, duration and maximum flow velocity are also computed. The safe grade levels for the industrial site are proposed considering these parameters to safe guard the flood disaster.
Page(s): 16-25
ISSN: 0975-2412 (Online); 0771-7706 (Print)
Appears in Collections:BVAAP Vol.26(1) [June 2018]

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