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Application of a flood inundation model to analyze the potential impacts of a flood control plan in Mundeni Aru River Basin, Sri Lanka

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Title Application of a flood inundation model to analyze the potential impacts of a flood control plan in Mundeni Aru River Basin, Sri Lanka
 
Creator Yoshimoto, Shuhei
Amarnath, Giriraj
 
Subject flood control
rainfall-runoff relationships
models
calibration
performance evaluation
river basins
discharges
reservoirs
water management
water storage
estimation
hydrography
satellite observation
disaster risk reduction
 
Description Capturing inundation extent by floods is indispensable for decision making for mitigating hazard. Satellite images have commonly been used for flood mapping, but there are limitations such as unavailability due to satellite’s orbital period or cloud cover. Additionally, it would also be beneficial for policy makers to figure out the impact of water management measures such as water storage options on flood mitigation and irrigation water strengthening. Utilization of flood inundation models would support providing information for these demands. In this study, the rainfall–runoff inundation (RRI) model was applied in a flood-prone basin in eastern Sri Lanka, and its applicability was discussed. The RRI model was capable of simulating discharge and inundation extent during flood events, although it should be noted that the model had been calibrated targeting only the flooding period. Satellite-observed rainfall data corrected with a scale factor were able to be used as the model input to simulate long-term trends in runoff just as well as when gauged rainfall data were applied. The calibrated model was also capable of evaluating flood mitigation effects of existing and proposed water storage options by simulating discharge with and without flood capture operations. By reproducing long-term inflow to the storage facilities using satellite rainfall data, it was possible to determine that water would reach the maximum level of the proposed storage facilities even during low-rainfall years.
 
Date 2018-03
2018-03-07T10:16:33Z
2018-03-07T10:16:33Z
 
Type Journal Article
 
Identifier Yoshimoto, Shuhei; Amarnath, Giriraj. 2017. Application of a flood inundation model to analyze the potential impacts of a flood control plan in Mundeni Aru River Basin, Sri Lanka. Natural Hazards. 25p. (Online first).. . 10.1007/s11069-017-3143-5
1573-0840
https://hdl.handle.net/10568/91304
https://doi.org/10.1007/s11069-017-3143-5
 
Language en
 
Rights Copyrighted; all rights reserved
Open Access
 
Format p. 491-513
 
Publisher Springer Science and Business Media LLC
 
Source Natural Hazards