GroMoPo Metadata for Abaya-Chamo lakes basin model

Ongoing socio-economic developments and climatic change have been pressurizing the groundwater resource availability in the Abaya-Chamo lakes basin, Ethiopian Rift valley. The primary goals of the present study are: (1) to simulate the groundwater gradient and flow direction, (2) to calculate the groundwater balances and flux of the sub-major river basins under the water budget code of the MODFLOW, and (3) to predict the future groundwater levels of the lake's basin under a projected changing climate. The numerical groundwater flow of the Abaya-Chamo lakes basin aquifer system is simulated using the USGS three-dimensional finite-difference groundwater flow model MODFLOW-2005 with Block centered flow packages (BCF). The following datasets, such as aquifer properties, geology, recharge, discharge, topography, etc., were used to simulate the present model. The calibrated steady-state groundwater flow modeling simulation of the Abaya-Chamo lakes basin also confirmed the through-flow system in terms of groundwater gradient and flow direction, on which groundwater flow happens from the plateau toward the floor into the lakes from both directions with a high gradient exist in the escarpment. The present study provides a sound foundation for modern scientific direction in water resource evaluation by establishing integrated surface and groundwater models that change climatic conditions for sustainable water resources management.

埃塞俄比亚裂谷阿巴亚-查莫湖流域的地下水资源禀赋正持续承受社会经济发展与气候变化带来的双重压力。本研究的核心目标包括：(1) 模拟地下水流梯度与流动方向；(2) 基于MODFLOW水预算模块，计算次级流域的地下水均衡量与通量；(3) 预估未来气候变化情景下该湖流域的地下水位变化。本研究采用美国地质调查局（United States Geological Survey, USGS）开发的三维有限差分数值地下水流动模型MODFLOW-2005，并结合块中心流程序包（Block Centered Flow Packages, BCF），对阿巴亚-查莫湖流域含水层系统的数值地下水流动过程进行模拟。本次建模用到了含水层属性、地质条件、补给量、排泄量、地形地貌等多类数据集。经校准的阿巴亚-查莫湖流域稳态地下水流动模拟结果，进一步验证了其地下水贯通流系统的特征：地下水流从高原区域流向湖盆底部，且两侧陡崖地带存在较高的水流梯度。本研究通过构建可模拟气候变化情景的地表-地下水耦合模型，为水资源评价领域的现代科学研究提供了坚实支撑，助力实现水资源可持续管理。