桃園地區地下水模擬與管理：紅土層與灌區抽水的影響;Groundwater Modeling and Management in Taoyuan: Effects of Laterite and Irrigation Pumping Activities

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Title:	桃園地區地下水模擬與管理：紅土層與灌區抽水的影響;Groundwater Modeling and Management in Taoyuan: Effects of Laterite and Irrigation Pumping Activities
Authors:	許力元;Hsu, Li-Yuan
Contributors:	應用地質研究所
Keywords:	THMC軟體;抽水量;地下水水流模型;桃園;地下水;紅土層;THMC software;Pumping Volume;Groundwater Flow Model;Taoyuan;Groundwater;Laterite
Date:	2025-07-23
Issue Date:	2025-10-17 13:03:09 (UTC+8)
Publisher:	國立中央大學
Abstract:	桃園地區受氣候變遷與都市化影響，近年來極端降雨與乾旱事件頻繁交替發生，使地表水資源調度面臨嚴峻挑戰，地下水遂成為穩定供水的重要替代水源。然而，桃園地區地表廣泛分布具低滲透性的紅土層，顯著阻礙雨水補注至下伏高傳導性之礫石含水層，導致補注效率偏低且呈現高度空間變異性。為深入探討地層特性與抽水行為對地下水流動之影響，本研究應用 THMC 軟體，建構三維地下水流動模式，整合實測鑽井剖面、地層材料參數、歷年降雨與抽水資料，模擬不同補注與抽水情境下地下水位之變化趨勢與補注反應。模擬結果顯示，紅土層造成降雨入滲延遲，其厚度與連續性對礫石層補注規模具顯著控制作用。在極端乾旱條件情境下，若以「一倍標準差」作為水位安全下限，研究區半年可容許抽水量約為 440 萬噸；若放寬至「兩倍標準差」，抽水潛能可提升至約 905 萬噸，惟伴隨水位下降幅度之增加，潛在風險亦需審慎評估。本研究探討紅土層對地下水補注延遲與空間異質性的影響機制，亦提出具量化依據之抽水管理策略，對未來桃園地區地下水資源之調度規劃、安全水位設定與永續利用，具有重要之科學參考價值與政策應用潛力。;Taoyuan City, influenced by climate change and rapid urbanization, has been facing increasing challenges in managing surface water resources due to the alternating occurrence of extreme rainfall and drought events. As a result, groundwater has become a critical alternative water source to maintain regional water supply stability. However, the widespread presence of a low-permeability lateritic layer across the surface significantly impedes the infiltration of rainwater into the underlying high-permeability gravel aquifer, resulting in low and spatially heterogeneous recharge efficiency. This study employed the THMC numerical modeling platform to construct a three-dimensional groundwater flow model, integrating borehole profiles, stratigraphic parameters, long-term rainfall records, and groundwater extraction data. The model simulates groundwater level responses and recharge dynamics under various recharge and pumping scenarios. Simulation results indicate that the lateritic layer causes a delay in rainfall infiltration, and its thickness and continuity substantially affect the recharge magnitude into the gravel aquifer. Under an extreme drought scenario, setting the groundwater level threshold at one standard deviation below the mean allows for an estimated 4.4 million cubic meters of groundwater extraction over six months. If the threshold is relaxed to two standard deviations, the extractable volume increases to approximately 9.05 million cubic meters, albeit with a significantly higher risk of water level decline. This study elucidates the key role of the lateritic layer in controlling recharge processes and spatial variability, and proposes a set of quantitatively supported groundwater management strategies. The findings offer a scientific basis for future groundwater scheduling, safety level planning, and sustainable utilization, contributing valuable insights for adaptive water resource management in the Taoyuan region.
Appears in Collections:	[Graduate Institute of Applied Geology] Electronic Thesis & Dissertation

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