GroMoPo Metadata for Ergene River Basin sandy complex aquifer model

This study aims to determine the safe and sustainable development and management of groundwater resources in Ergene River Basin located in northwestern Turkey. A numerical groundwater model was developed for the Sandy Complex aquifer, which is the most productive and the most widespread aquifer in the basin. The finite difference model with 5900 cells was used to represent the steady and unsteady flow in the aquifer. The model was calibrated in two steps: a steady state calibration by using the observed groundwater levels of January 1970, followed by a transient calibration by using the observed groundwater levels for the period of January 1970 and December 2000. The resulting model was used to develop groundwater pumping scenarios in order to predict the changes in the aquifer system under a set of different pumpage conditions for a planning period of 30 years between January 2001 and December 2030. A total of eight pumping scenarios were developed under transient flow conditions for the planning period and the results were evaluated to determine the safe and sustainable yields of the aquifer. The results, presented in the form of a trade-off curve, demonstrate that the continuation of the present pumping rates exceeds both the safe and the sustainable yields of the aquifer system.

本研究旨在探明土耳其西北部埃尔热内河流域地下水资源的安全可持续开发与管理方案。针对该流域内生产力最高、分布最广的砂质复合含水层（Sandy Complex aquifer），构建了数值地下水流模型。研究采用包含5900个网格单元的有限差分模型，表征含水层内的稳定流与非稳定流运动。模型分两步完成校准：首先以1970年1月的实测地下水位数据开展稳态校准，随后以1970年1月至2000年12月时段的实测地下水位数据开展瞬态校准。基于校准完成的模型，构建地下水抽水情景，以预测2001年1月至2030年12月这30年规划期内，不同抽水条件下含水层系统的变化特征。本次共针对规划期内的瞬态流条件设计了8种抽水情景，并对模拟结果展开评估，以确定该含水层的安全可持续开采量。研究结果以权衡曲线形式呈现，结果表明：维持当前抽水速率的做法将超出该含水层系统的安全与可持续开采阈值。