結合水質變異與水流模擬模式評估屏東平原地下水適合飲用之區域

Combining water quality variability and flow simulation models to assess potential zones of groundwater used for drinking in the Pingtung Plain

王煒傑(Wei-Jie Wang)

指導教授 ： 陳瑞昇 ； 張誠信

國立中央大學/地球科學學院/應用地質研究所/碩士(2012年)

摘要

屏東平原地表水資源不足，居民大量抽取地下水使用，造成沿海地區發生嚴重之地下水水位大幅下降，進而導致海水入侵與地層下陷問題。本研究整合地下水水質與水量條件劃定屏東平原地下水適合飲用之區域，在地下水水質評估方面將使用多變量指標克利金法根據飲用水水質標準分析適合飲用水質之空間變異，並機率劃定適合飲用之地下水區域；在地下水水量評估方面則以地下水水流模式MODFLOW模擬屏東平原地下水流動與抽水量，模式經過率定後，分析各鄉鎮市抽水與洩降關係，以決定抽水對含水層衝擊性較低之區域；最後結合地下水水質與水量條件評估屏東平原地下水可飲用之區域。本研究結果顯示就水質與水量觀點屏東平原地下水最適合飲用之鄉鎮為鹽埔鄉，而不適合作為飲用水之區域有大寮鄉、東港鄉、南州鄉、崁頂鄉、新園鄉、枋寮鄉、萬巒鄉、佳冬鄉、林邊鄉、林園鄉。

關鍵字

地下水 ； 多變量指標克利金法 ； 模組化三維地下水流模式

並列摘要

Surface water is considerably lack in the Pingtung Plain.Thus, many residents massively extract groundwater to use, resulting that rapid decreases in groundwater levels, seawater intrusion and land subsidence. This study is to combine water quality variability and flow simulation models to assess potential zones of groundwater used for drinking in the Pingtung Plain. In water quality, multivariate indicator Kriging and water quality standard are used to spatially analyze groundwater quality in the Pingtung plain and to probabilistically delineate zones of proper drinking. In water quantity, the groundwater flow model, MODFLOW, was adopted to simulate groundwater drawdown for specified pumping rates. To reduce impacts on land subsidence by pumping, zones of pristine groundwater quality with minimizing pumping drawdown were the optimal locations to extract groundwater for drinking. The results of this study could offer agricultural administrators a sound guideline for obtaining clean and low-impact groundwater resources for drinking.

並列關鍵字

MODFLOW ； MVIK ； groundwater

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