Urban flood management using coupled 1D 2D hydrodynamic model for city of Chennai

Abstract

newlineClimate change in association with rapid urbanization creates newlinefrequent urban flood hazards around the world. It is a serious issue in terms of newlineextreme intensity of the rainfall and reduced time of concentration. In order to newlineminimize the impacts of floods on lives and property, effective mitigation newlinemeasures should be identified, planned and implemented. The present study newlineaims to achieve the dynamic behaviour of the hydrodynamic process in an newlineurban environment with 3-way coupled approach. Chennai city is drained by three rivers, viz. Adyar in the southern part, Cooum in the middle and Kosasthaliyar in the north.Amongthese, Adyar river witnessed a copious discharge with very high flood levels during 2015 Chennai Flood. Based on the flood volume witnessed in the past, dense urban population in the downstream, fan shaped catchment and number of water newlinebodies present in the catchment, river Adyar is chosen for this study. newlineIn this study, Adyar sub-basin is divided into two regions namely newlinezone A, hydrologicmodelling area and Zone B hydrodynamic modelling area. newlineHydrologic model HEC-HMS is used to generate flood hydrographs at outlet newlineof Zone A. newline newline