地下水資源為台灣地區重要之供水來源之一，其中地下水資源較豐沛之濁水溪沖積扇與屏東平原沖積扇近年來均已超限利用，甚而導致嚴重之地層下陷與地下水環境劣化等議題。雖然地表水與地下水之交互水體傳輸密不可分，但其水文特性卻存在極大差異，加上台灣地區降雨時空豐枯不均且新水源開發不易且受限，如何有效運用地表水與地下水資源的不同時空尺度之水文特性，為維持水資源永續經營之首要任務。本計畫104年度以屏東平原為研究區域，將蒐集與整理屏東平原地表與地下水資源潛能評估相關文獻，並分析與探討歷年針對屏東平原地表與地下水數值模擬之邊界條件給定與水文地質參數設定等；統整中央地質調查所水文地質資料庫鑽探資料與屏東平原水文地質剖面圖資料以及水利署地下水觀測井鑽探資料，用以建置與數化屏東平原3D水文地質模型；接著以WASH123D模式建置屏東平原整合地表地下水數值模型，並以近年水文事件進行模式參數檢定與驗證；進一步使用所建立之整合地表地下水數值模式，評估屏東平原大潮州人工湖尚未完工營運前之地下水補注方案與成效之情境模擬。期望透過水文地質模型地檢討與整合地表地下水數值模式的建置與應用，加強對屏東平原區域地表地下水特性之掌握，提供相關單位決策依據以減少不當之人為過度開發，以達成地下水保育與國土資源永續使用之願景。;Groundwater is one of major water resources in Taiwan. Due to over pumping of groundwater for past several decades, both Zhuoshui River Alluvial Fan and Pingtung Plain Alluvial Fan have been facing critical issues of land subsidence and degradation of groundwater environments, such as sea water intrusion and contamination. Although subsurface water and surface water are naturally linked in view of hydrological cycles, great discrepancies in residence time and responses to different hydrological forcing are observed. Rainfall in Taiwan has great spatial and temporal variations and developments of new water resources are extremely difficult due to environmental protections, and thus bring great challenges to water resources management in Taiwan. Therefore it is important to develop integrated methodologies for taking advantages of various spatial and temporal characteristics of surface water and subsurface water to meet the requirement of sustainable development in water resources. In the second year (2015), we will first collect and review literatures on assessing surface water and groundwater potentials of the Pingtung Plain Alluvial Fan, and discuss and analyze the setting of hydrological parameters and boundary conditions proposed in past years. We will further integrate hydrological data set and drilling data from both the Central Geological Survey and the Water Resources Bureau for develop and digitalize the 3D hydrological model of Pingtung Plain Alluvial Fan. The WASH123D model will be used to develop the integrated surface water and subsurface water numerical model of the Pingtung Plain Alluvial Fan. Calibrations and validations will be conducted with past extreme events. We will further apply the integrated model to assess the feasibility of the big-Chaozhou man-made pond with designed scenarios. By examining hydrological setting and integrated surface-subsurface water modeling, better understanding of regional characteristics of water resources of the Pingtung Plain Alluvial Fan should be provided to support decision making and reduce improper over usage. Through these studies, it is expected to understand hydrological characteristics of groundwater and surface water systems for supporting effective management of water resources of Pingtung Plain Alluvial Fan.;研究期間：10402~10412
