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Coupled Flood Modelling Of A Severely Flood-prone Coastal Megacity Considering Combined Flash And Tidal Flooding - A Case Study Of Mumbai, India

Congress: 2015
Author(s):
AbstractMajority of coastal cities are flood-prone due to cyclones, climate-change induced sea-level rise, tides and storm surges, land subsidence, low-lying terrains, high urbanisation and dense population. In this context, a densely populated and severely flood-prone coastal megacity, Mumbai in India has been investigated to assess the spatial pattern of its flood hazard. Mithi river catchment in Mumbai, located at the heart of the city, is an urban -industrial ecosystem with its outlet at the mouth of the Arabian Sea. The catchment upstream comprises of steep hilly regions, followed by relatively flat and highly industrialised areas, while downstream of very sensitive mangrove wetlands estuary and slums. Thus, these special features of the catchment, located at the south-west monsoon belt, result in severe floods almost annually due to heavy rainfall coined with high tides which make flood modelling even more challenging. Hence, the three-way hydrodynamic interaction among overland flow, river flow and stormwater flow of the catchment along with high tide during floods has been modelled using a robust 1D-2D flood modelling tool MIKE FLOOD. The severity of flooding has been assessed through different scenarios namely, effect of distributed rainfall over the entire catchment, effect of high tide alone (no rainfall), and combined effect of distributed rainfall and high tide. Thus, the study also aims at delineating and proportioning the areas prone to urban flash and tidal flooding separately in addition to the combined effect of heavy rainfall and high tide.
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