| dc.description.abstract | This study investigated climate change which affect of rainfall characteristics at Shihmen Reservoir catchment, and also analyzed the rainfall by the Mann-Kendall method some periods in 1966-1990, 1991-2011 and 1966-2011. According to the analysis result, the average annual rainfall in 1966 -1990 showed that the increasing trend occur in April, and the decreasing trend occur in January, February and June. For 1991-2011 is only had trend decreased which can seen in May and August, thus it can be concluded that climate change may affect the distribution of rainfall significantly. In Taiwan, dry season started from May to October, whereas wet season started from November to April. Hence, there was an obvious rainfall trends distribution which emerging in the dry and wet alternative.
A standard used in a rain gauging station usually will be point rainfall. In aspect of hydrologic analysis, since an average regional rainfall is the basis for designing and planning water resource engineering, a point rainfall will be converted to a surface rainfall. By converting point rainfall into surface rainfall, this study picked out all maximum possible rainfall among rainfall gauging stations as standards and multiplied maximum possible point rainfall by above maximum values of area reduction factor, 0.7 in order to convert them into maximum possible rainfall. For area reduction factor it often considered the size of research area, so an estimated maximum possible rainfall would be more capable to show the actual area properties. This study suggested that PMP can adopt 1175.8mm, and PMF can adopt 15675.5cms. Since all research results in this study were above the design-flood inflow of Shihmen Reservoir, it showed that this study would be more conservative and could be used as a reference for future inflow projects. | en_US |