GroMoPo Metadata for Kaohsiung city WASH123D model

Study region: Four districts (Meinong, Qishan, Dashu, and Daliao) of Kaohsiung city, Southern Taiwan & nbsp;Study focus: The understanding of aquifer recharge in terms of water table response to rainfall is of critical importance to groundwater systems management and various endeavors have been made to estimate the amount of recharge using rainfall data. The purpose of this study is to evaluate the groundwater level response to rainfall and determine the recharge potential for shallow aquifers. We showed a simple approach to estimate specific yield (Sy) and hydraulic conductivity (k) as functions of rainfall and water level data.& nbsp;New hydrological insights for the region: Correlation method is applied to investigate groundwater level response to associated rainfall and it was found that the rise in water table linearly depends on the rainfall amount per event. Results show the annual recharge rates of 244-1472 mm year1, which represent 12-43% of rainfall in the study area. The estimated k (order of 10(4) to 10(5) m s(-1)) and S-y (0.20-0.51) were used as prior values to setup groundwater numerical modeling using WASH123D. The real-time case scenario simulation using pumping and rainfall data indicated the reasonable hydrological response of groundwater levels to rainfall. The long-term simulations should be performed with WASH123D to deal with the subjectivity of sustained groundwater pumping and sustainability of aquifers for better groundwater resource planning and management.

研究区域：中国台湾南部高雄市4个行政区（美浓、旗山、大树、大寮）。
研究重点：明晰地下水位对降雨的响应机制以理解含水层补给过程，对地下水系统管理至关重要；过往已有诸多研究尝试通过降雨数据估算含水层补给量。本研究旨在评估地下水位对降雨的响应特征，并确定浅层含水层的补给潜力，提出了一种基于降雨与水位数据估算给水度（specific yield, Sy）和导水率（hydraulic conductivity, k）的简易方法。
该区域水文研究新认知：本研究采用相关分析法探究地下水位对同期降雨的响应，发现地下水位升幅与单次降雨量呈线性相关。研究结果显示，研究区年补给率为244~1472 mm·a⁻¹，占研究区总降雨量的12%~43%。本研究估算得到的导水率（量级为10⁴~10⁵ m·s⁻¹）与给水度（0.20~0.51）作为先验参数，用于构建基于WASH123D的地下水数值模型。利用抽水与降雨数据开展的实时情景模拟结果表明，地下水位对降雨的水文响应合理可信。未来应采用WASH123D开展长期模拟，以处理持续地下水抽水方案的主观性问题与含水层可持续性问题，从而优化地下水资源规划与管理工作。