Estimation on Groundwater Safty Yield of Taipei Basin by using Geostatistics Method

• Main Authors: Chun-Ming Hsu, 許峻銘
• Other Authors: Cheng-Haw Lee
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/33123155276848398114

碩士 === 國立成功大學 === 資源工程學系碩博士班 === 94 === 　In discussing groundwater problems, it is important to evaluate groundwater flow precisely. Such evaluation can be accomplished by executing the situ-experiment, but due to the financial limitation of the study, the situ-data available in this research can be limited. However, geostatistics method, requiring few situ-data to generate a statistic result, can overcome the problem of lacking such data in this study. 　In addition to 130 borehole data obtained in Taipei Basin and 5 conductivity data, this research applied Sequential Gaussian Simulation Method (SGS) to construct the conductivity random spacing field in Taipei Basin. The continuity of the random spacing field is related to the river mud sediment direction. MODFLOW was utilized on the random spacing field, to construct the groundwater model in Taipei Basin and to simulate the groundwater flow behavior. Subsequently, Hill Method and Harding Method were exploited to estimate the groundwater safety yield and safety water level. 　The result of the study indicates that the areas in Taipei Basin suitable for pumping groundwater are Beitou District, Shilin District, Sindian City and Wugu countryside, while those unsuitable are Zhongshan District, Songshan District, Neihu District. At the aspects of groundwater safety yield and discharging volume, Sindian City has a larger amount of discharging volume, which can provide more safety yield than other areas in the basin. Within the four years from 1999 to 2002, the annual average safety yield in Taipei Basin is about 88.50 million tons per year.