地下水人工補注功效之探討

Study on the Efficacy of Groundwater Artificial Recharge

翁琮哲(Tsung-Che Weng)

指導教授 ： 張德鑫

中原大學/工學院/土木工程研究所/碩士(2001年)

https://doi.org/10.6840/cycu200100227

摘要

台灣地區因雨量的分佈不均，因此許多地區抽取地下水以補水資源需求之不足。由於地下水的大量超抽，使得各地區的地下水水位持續下降，結果造成地下水儲蓄總量日益減少。為了使地下水水位上升，本研究探討以人工補注的方法進行地下水補注，其中將針對人工補注湖及ASR井兩種方法，比較兩者的補注效果及優缺點。
本研究運用USGS所發展的MODFLOW三維地下水水流模式進行不同補注方案之數值模擬。首先假設虛擬場址，針對人工補注湖在不同的地表坡度、水力傳導係數、補注湖面積及地下水位高低等不同情況，比較其入滲量及補注效果。
人工湖補注數值模擬顯示，在地表坡度越陡和地下水位越高時，其補注的水會越早流出地表，而無法完全補注到下游部份。在入滲量方面，當水力傳導係數越大時，其補注量也越大。
在ASR井補注模擬方面，本文採用MODFLOW地下水水流模式及MT3DMS污染物傳輸模式，針對受污染的含水層進行補注及回抽模擬。模擬結果顯示，使用ASR井補注在受污染之含水層是相當有效的。由於ASR井可以將豐水季補注之乾淨水暫儲於受污染的含水層中，並與受污染之地下水形成一介面，可在枯水季時再抽出使用，使水資源達到最佳調配效果。

關鍵字

人工補注 ； ASR系統 ； 人工湖

並列摘要

Due to the uneven rainfall distribution in Taiwan, water resources have to be supplemented by drawing underground water in many places. In some areas, the over-drawing of groundwater has resulted in a drop of the ground water table and its storage. The aim of this study is to investigate effectiveness of artificial recharge methods to recharge the groundwater. The methods compared are the artificial recharge basin and ASR well.
In this study, three-dimensional groundwater flow model, MODFLOW, developed by USGS is applied to model the recharge effect using different recharge methods. First, a virtual site is set up for artificial recharge basin method. Then based on the surface slope, hydraulic conductivity, area of the recharge basin and groundwater level, the infiltration and recharge effects are compared.
In ASR well method, this study uses MODFLOW together with MT3DMS, a three-dimensional transportation model to investigate the recharge and drawing of groundwater of the contaminated water layer. Simulation results show that ASR well is very effective in contaminated water layer. The ASR well can recharge and store plenty of clean water in the contaminated water layer in the wet season, and this stored water can be pumped up for consumption in dry season.

並列關鍵字

Recharge basin ； ASR ； Artificial Recharge

參考文獻

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