The Impacts of Climate Change on the Feitsui Reservoir Capability of Water Supply, Hydropower Generation, and Flood Mitigation
Date Issued
2010
Date
2010
Author(s)
Tai, Chia-Hui
Abstract
In recent years, climatic variation leads to the increasing frequency of extreme events and the difference of river flow between wet period and dry period. The increasing intensity and duration of drought events will result in the storage insufficient for water supply and hydropower generation. On the other hand, the extreme flood in wet seasons will cause great impacts on the operation of reservoir in flood mitigation. Climate change may cause more climate variability and further result in more frequent extreme hydrological events which may greatly influence reservoir’s functions. The purpose of this study is to evaluate the impact of climate change on the capability of water supply, hydropower generation and flood mitigation of a single reservoir. The inflows are generated based on different climate scenarios from different GCMs’ outputs. Then, these inflows are applied to evaluate reservoir storage for estimating water supply capacity and hydropower generation. The flood mitigation capability is evaluated for different typhoon events that are designed based on a historical typhoon event and strengthened according to GCMs’ outputs. The Feitsui reservoir is chosen as a case study. Results indicate that most of cases display fewer insufficient for water supply, whereas the GFCM2.1 model leads to higher insufficient rate, only 2.79% in A1Bm and 1.23% in A2m, respectively. Under climate change, hydropower generation will decline 2.3 and 5.66 million degrees in short term and middle term in dry period, and increase 1.82 and 0.82 million degrees in short term and middle term in wet period, respectively. When the flood mitigation operation starts at higher water level, the typhoon event having early peak rainfall may cause reservoir safety problem under climate change.
Subjects
Climate Change
Reservoir
Flood Mitigation
Water Supply
Hydropower Generation
SDGs
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