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ISSN: 2157-7587

Hydrology: Current Research
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Research Article

Event Based Flood Inundation Mapping Under the Impact of Climate Change: A Case Study in Lower Kelani River Basin, Sri Lanka

Gouri De Silva*
River and Environmental Engineering Lab, Department of Civil Engineering, Graduate School of Engineering, University of Tokyo, Tokyo, Japan
*Corresponding Author : Gouri De Silva
PhD Student, River and Environmental Engineering Lab
Department of Civil Engineering, Graduate School of Engineering
University of Tokyo, Tokyo, Japan
Tel: +81-70-2821-9426
E-mail: [email protected]
Received: February 28, 2016 Accepted: March 02, 2016 Published: March 10, 2016
Citation: Silva GD (2016) Event Based Flood Inundation Mapping Under the Impact of Climate Change: A Case Study in Lower Kelani River Basin, Sri Lanka. Hydrol Current Res 7:228. doi:10.4172/2157-7587.1000228
Copyright: © 2016 Silva GD, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 

Abstract

The downstream low lying region of the Kelani River including the Colombo suburbs, experience severe inundation due to localized heavy rainfall events and high precipitation in the upper basin. Under the impact of climate change it is very likely that more frequent heavy rainfalls in tropics [1] will occur. Therefore it is extremely important to have a better understanding about future rainfall patterns and intensities in the basin and inundation extents of the low lying regions characterized by high population concentration and economic activities that form the suburbs of the commercial capital. This paper presents the extreme rainfalls occurrence potential and resulting flood inundation along the lower reach of Kelani River. Coarse grid atmospheric parameters provided by GCM models for A2 and B2 scenarios of IPCC [1] are downscaled to catchment scale by the application of Statistical Downscaling Model (SDSM). Flood discharge and inundation along the Kelani River reach below Hanwella was analyzed by the application of two-dimensional flood simulation model (FLO-2D). Inflow to the model at Hanwella, is estimated by the HEC- HMS model under future extreme rainfall events. Areas vulnerable for inundation under the above climate change scenarios are presented.

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