The Impacts of Climatic Change on Water Resources-Rainfall Analysis

• Main Authors: Hsu, Shu-Ping, 許書平
• Other Authors: Yu, Gwo-Hsing
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/62761514117498174471

碩士 === 淡江大學 === 水資源及環境工程學系 === 85 === This research deals with the impact of climatic changes on the rainfall of Taiwan area. It is based on the rainfall data of long-standing trend, distribution, structure, and the rainfall characteristics of mei-yu as well as typhoon seasons. Several important methods are used as following: Simple Linear Regression Method, Nonparametric Statistical Method (Wald-Wolfowitz Runs Test), Time Series Model and Area Organized Trend Test. For the purpose that the widespread and complete results can apply to water resources planning and using in the future, this study analyzes all over Taiwan area, including the rainfall information in 346 stations that have been recorded for at least 20 years and at least to the year of 1990. The results indicate that both yearly non-rainy days and maximum yearly continuous non-rainy days appear increasing trend in the whole Taiwan area. At the same time, the drought season lasts apparently longer in the middle and the south areas. The amount of the yearly rainfall is inclined to decrease in the middle and the south areas, but to increase in the north area. As to the distribution of yearly rainfall, it commonly appears the increasing trend from February to May, while decreasing trend from June to December. Among this, the rainfall of spring in the north and the middle areas appears the increasing trend from February to May; the rainfall of summer in the middle and the south areas appears the decreasing trend on June, July and October. The structure of Time Series Model also shows that the monthly rainfall has manifestly changed. As far as the mei-yu season is concerned, the rainfall in the east area appears decreasing trend. In addition, typhoons'''' invading times and the rainfall they caused have no obvious changes. As the typhoons'''' movement, however, the rainfall caused by the typhoons'''' invading from Hua-tung area appears increasing trend and influences the whole Taiwan area, especially the east area apparently.