Research Article
Impact of climate change on hydrological processes over a basin scale in northern Taiwan
Pao-Shan Yu,
Yu-Chi Wang,
Corresponding Author
Pao-Shan Yu
Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan, Taiwan 701, R.O.C.
Department of Hydraulics and Ocean Engineering, National Cheng Kung University, Tainan, Taiwan 701, R.O.C.===Search for more papers by this authorYu-Chi Wang
Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan, Taiwan 701, R.O.C.
Taiwan Typhoon and Flood Research Institute, National Applied Research Laboratories, Taichung, Taiwan 407, R.O.C.
Search for more papers by this authorPao-Shan Yu,
Yu-Chi Wang,
Corresponding Author
Pao-Shan Yu
Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan, Taiwan 701, R.O.C.
Department of Hydraulics and Ocean Engineering, National Cheng Kung University, Tainan, Taiwan 701, R.O.C.===Search for more papers by this authorYu-Chi Wang
Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan, Taiwan 701, R.O.C.
Taiwan Typhoon and Flood Research Institute, National Applied Research Laboratories, Taichung, Taiwan 407, R.O.C.
Search for more papers by this authorAbstract
This study investigates the impact of climate change on rainfall, evapotranspiration, and discharge in northern Taiwan. The upstream catchment of the Shihmen reservoir in northern Taiwan was chosen as the study area. Both observed discharge and soil moisture were simultaneously adopted to optimize the HBV-based hydrological model, clearly improving the simulation of the soil moisture. The delta change of monthly temperature and precipitation from the grid cell of GCMs (General Circulation Models) that is closest to the study area were utilized to generate the daily rainfall and temperature series based on a weather generating model. The daily rainfall and temperature series were further inputted into the calibrated hydrological model to project the hydrological variables. The studies show that rainfall and discharge will be increased during the wet season (May to October) and decreased during the dry season (November to April of the following year). Evapotranspiration will be increased in the whole year except in November and December. Copyright © 2009 John Wiley & Sons, Ltd.
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