| 研究生: |
李心惟 Lee, Shin-Wei |
|---|---|
| 論文名稱: |
結合HEC-RAS與MODFLOW於濁水溪沖積扇地下水與地層下陷模擬 Integrating HEC-RAS and MODFLOW to Simulate Groundwater and Landsubsidence of Choushui River Alluvial Fan |
| 指導教授: |
李振誥
Lee, Cheng-Haw |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 資源工程學系 Department of Resources Engineering |
| 論文出版年: | 2014 |
| 畢業學年度: | 102 |
| 語文別: | 中文 |
| 論文頁數: | 96 |
| 中文關鍵詞: | 地下水 、地層下陷 、MODFLOW 、IBS1 、HEC-RAS |
| 外文關鍵詞: | Groundwater, Land subsidence, MODFLOW, IBS1, HEC-RAS |
| 相關次數: | 點閱:160 下載:13 |
| 分享至: |
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台灣西部沿海地區長年以來超抽地下水行為嚴重,且降雨時間不均,地表水無法有效運用,使得地下水供需失衡,造成嚴重地層下陷,濁水溪沖積扇地區為台灣最大地下水區,但下陷面積為全國最大,且近年來下陷中心逐漸向內陸移動,將影響高鐵沿線及其他重大工程之安全,故本研究主要以探討地下水與地層下陷對於濁水溪沖積扇之影響。
本研究以地下水流數值模式PROCESSING MODFLOW建構三維地下水流數值模型,過去有關濁水溪沖積扇地下水流數值模式研究眾多,但較少對濁水溪主流與地下水流間交互形況進行探討,因此本研究先利用一維河道水理演算計算出各時間段河川水位高程,當作數值模式中河川套件(River package)之參數輸入,並以河川套件來表示濁水溪主流對於濁水溪沖積扇地下水系統入滲行為,完成地下水流數值模式建置後,再以非耦合方式使用IBS1模式計算濁水溪沖積扇地層壓縮量,最後結合本研究所建立地下水流模式與地層下陷模式,進行減抽與無減抽地下水對地下水位與地層壓縮量變化分析。
研究結果推估出濁水溪平均每年入滲補注地下水量約3.65億噸,地表補注量約每年10.20億噸,邊界側向補注量約每年4.10億噸,且平均每年總抽水量約為18.99億噸,整體地下水收支情況仍為超抽。減抽方案模擬結果顯示,地下水水位可回升0.05公尺至5.65公尺,其中最大回升量位於元長鄉地區;而地層壓縮量可回彈1.07至5.19公分,以含水層二與含水層三改善最為顯著,此結果可提供未來評估高鐵沿線地區,減緩地下水位下降及地層下陷之參考。
Land subsidence caused by over pumping of groundwater resource has severely caused large-scale damage to the Choushui river alluvial fan of the western area in Taiwan. The center of subsidence which has gradually moved inland in recent years will affect the safety of high speed rail and major engineering project. Therefore, this study uses integrated numerical models to simulate the effect on groundwater level and land subsidence in study area. The MODFLOW model and INTERBED model are adopted to simulate groundwater flow and land subsidence respectively. Moreover, HEC-RAS is utilized in this study to calculate the stream water level in order to represent groundwater-river interaction in groundwater system with River package. Models are used to analyze the change in groundwater level and land subsidence with a future reduced pumping scheme and compared to no reduced pumping plan. The result shows that the groundwater system is still over used during the simulated period. Besides, the groundwater level will expect to rise up 0.05m to 5.65m and the formation will rebound from the value 1.07cm to 5.19cm with significant improvement in aquifer two and aquifer three after the reducing scheme practice. The above result may apply to evaluate groundwater management and reduce the damage form the land subsidence in study area.
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