| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 95 === The atmosphere studies in the Earth system in the past emphasize possible meteorological changes under natural climate vicissitude. However, recently the researchers attempted to investigate the impact of climate vicissitude to regional circulation of water and the hydrology environment. Climate vicissitude not only affects the direct influence of surface and underground circulation of water, but also indirectly changes the region hydrology environment.
Demonstrated by the historical date, it is noted that the circulation of water affects the rainfall amount as well as the temperature. Moreover, it affects the distribution of rainfall condition. In North Taiwan, the local record of the near twenty year shows the rainfall of dry season being gradually decrease, but the rainfall of wet season being gradually increases.
The improper land-use changes the carrying capacity of hydrological environment. As a result, water quality deteriorated in an obvious trend. The General Water Load Function (GWLF) model is selected to simulate some scenarios under the impacts of climate changes. Moreover, the study focused on the hydrological factors which affect the water quality and assimilative capacity in Choshui creek basin, where each factors forcing by climate changes. The study draws up applicable tactics and criterions about managing water quality to provide environmental management.
The experimental results demonstrate that rainfall pattern, in terms of probability changes differently in Taiwan. In Fetitsui reservoir watershed, the rainfall becomes more concentrated, while in Shihmen reservoir watershed disperser. In Yun-Feng Bridge region, it shows the continuous rainfall slightly reduces. Simulation results of the stream flow decreases, but the nitrogen and phosphorus concentration of the flow shows a tendency of increase.
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