應用三維地下水模式於颱洪期間土石壩地下水位預測

Using Three-dimensional Groundwater Model on the Groundwater Level Prediction of Embankment Dam during the Flood Period

洪耀明(Yao-Ming Hong)

《水保技術》 8卷1期 (2013/01) Pp. 42-49

摘要

本研究使用三維地下水位模式Modflow進行日月潭水社壩於莫拉克颱風期間，降雨導致地下水之變化及流動情況，經由降雨記錄得知，莫拉克颱風期間累積雨量達777mm；同時經由已知縱向三個地下水井水位之變化，得知超大豪雨導致壩體下邊坡地下水位上快速上升。經由Modflow軟體及試誤法推得壩體下游之地下水位及水力傳導係數，但因為無橫向之地下水井水位資料，因此無法得知壩體側翼是否有地下水湧入，建議未來應於縱向及橫向皆設置地下水位記錄器，以便精確了解地下水位之流向。

關鍵字

地下水位 ； 土石壩 ； 颱風

並列摘要

This study adopted the Modflow, a three-dimensional groundwater model, to proceed the groundwater level fluctuation in the Shueishe dam of SunMoon Lake during the period of Typhoon Morakot. The rainfall records show that cumulative rainfall depth reach 777 mm, which induces the fast rise of groundwater level in three wells located in the downstream of longitudinal direction of dam. Using the Modflow software and the trial-and-error method, the groundwater level distributions and the hydraulic conductivities in the downstream of dam were resolved. However, due to the lack of the groundwater well in the lateral direction of dam, we cannot be informed of the discharge of groundwater from the flank of dam. Therefore, the groundwater wells should be also installed in the longitudinal and the lateral direction, so as to obtain the flow direction of groundwater.

並列關鍵字

Groundwater Level ； Embankment Dam ； Typhoon