Feasibility Analysis of the Utilization and Management for Groundwater in the Taipei Basin
Date Issued
2008
Date
2008
Author(s)
Chou, Yen-Lu
Abstract
Taipei basin is located in the northern Taiwan. The area below elevation 20m is about 240km2. Groundwater had been overexploitation in 1950s, resulted in the groundwater level dropping sharply. The government delineated the Taipei basin as groundwater restricted area to prevent further withdrawing in 1970. Since then, the groundwater level in Taipei basin had risen gradually, and now is bounced to the normal condition. The objective of the study was to develop a hydrogeologic model of Taipei basin using MODFLOW. The developed model is aimed to calculate water budget and safe yield. Moreover, factor analysis and Piper diagram were applied to analyze groundwater quality and to evaluate the accessibility of groundwater resources utilization in the Taipei basin.hree hydrogeologic layers present in the Taipei basin groundwater model: Sungshan aquifer, aquitard, and Chingmei aquifer. The Chingmei aquifer is the main aquifer in the Taipei basin. The model simulated groundwater level is calibrated and validated against the measured groundwater level with the root mean square error (RMSE) of 0.67m and 0.43m, respectively. The simulated water budget indicates that the groundwater annual storage increases about 17millions tons in Chingmei aquifer. The groundwater safe yield of the Taipei baisn estimated by Hill method is about 54millions tons per year, whereas the safe yield estimated by the zero water level method is about 126 million tons per year.hree main factors of groundwater quality in the Taipei basin are determined by the factor analysis and they are salinity-residual factor, non-carbonate hardness factor and organic matter factor. Results from factor analysis and Piper diagram show that the groundwater quality in eastern Taipei city and southwest basin is not suitable for domestic use, other area is in good condition. Based on the safe yield estimated by the Hill method and zero water level method, the permissible amount of groundwater withdrawn in the Taipei basin is recommended about 82 millions tons per year. However, groundwater is still prohibited from common use, except for engineering drainage in most of the basin. To comply with the restriction order, the permissible yield is reduced to 25 millions tons per year. In order to effectively use and manage groundwater resources in the Taipei basin, the restriction order should be revised. Furthermore, the groundwater level and quality should be monitored continuously and revaluated regularly.
Subjects
Taipei basin
Groundwater
Safe yield
Factor analysis
Groundwater level management
Type
thesis
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