台灣地下水資源在平原區的調查已經相當豐富,然而台灣山地約約佔總面積的2/3,其所涵養之地下水資源勢必相當充沛。本研究基於永續經營的概念,採用地下水模擬系統(groundwater modeling system, GMS)中之MODFLOW軟體,進行濁水溪中游地區的三維度數值模式建構,估算該地區的地下水安全出水量。本研究定義研究區之地下水安全出水量,為研究區西側之給定水頭邊界地下水流出量,以評估在不影響研究區地下水資源的情況下,可增加開採的地下水資源量。首先建立研究區之水文地質概念模式,並進行數值模式之建立與率定,之後採用2000年至2009年間之平均降雨量,進行分年之安全出水量估算,10年之平均出水量為每年199百萬噸,且出水量有隨年遞增之結果;再使用這十年間之月平均最大與最小降雨量,估算最大最小降雨情況下的安全山水量,結果分別為每201語198百萬噸。研究結果顯示,本研究區之出水量受降雨變化之影響不顯著,可能為本研究區之降雨大部分為河谷沖積區所貯存與濁水溪排出所致。
The investigation of groundwater resources in the alluvia l plain is abundant in Taiwan. The mountainous region occupied 2/3 of Taiwan area, but the information of groundwater resources in the mountainous region is very lack. In this study, groundwater modeling system (GMS) with MODFLOW code is used to evaluate the groundwater resources in the midstream of Jhoushuei River Basin, Taiwan. A three -dimensional numerical mode l is used to evaluate the safe yield of groundwater under steady state situation. The safe yield is defined as the outflow from the specified head boundary in the west part of the study area and does not disturb the original groundwater system. The conceptual model is constructed first and then the numerical model is built based on the conceptual model. The numerical model is ca librated by the observed groundwater level. Mean precipitation data from 2000 to 2009 is input in the numerical mode l to evaluate the safe yield in the study area. The result shows that the mean safe yield is about 199×10^6 ton/year. The safe yield under the maximum and minimum precipitation situation is 201×10^6 and 198×10^6 ton/year, respectively. The influence of the input precipitation is not sensitive. This might be due to the reason that the mountain alluvia and river contain most of the water from precipitation in this area.
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