GroMoPo Metadata for Ismarida plain model

This paper presents the development of a regional flow simulation model of the stream-aquifer system of Ismarida plain, northeastern Greece. It quantifies the water budget for this aquifer system and describes the components of groundwater and the characteristics of this system on the basis of results of a 3-year field study. The semiconfined aquifer system of Ismarida Lake plain consists of unconsolidated deltaic clastic sediments, is hydraulically connected with Vosvozis River, and covers an area of 46.75 km(2). The annual precipitation ranges in the study area from 270 to 876 mm. Eighty-seven irrigation wells are densely located and have been widely used for agricultural development. Groundwater flow in this aquifer was simulated with MODFLOW. Model calibration was done with observed water levels, and match was excellent. To evaluate the impacts of the current pumping schedule and propose solutions, four management scenarios were formulated and tested with the model. Based on model results, the simulated groundwater budget indicates that there must be approximately 33% decrease of withdrawals to stop the dramatic decline of groundwater levels. The application of these scenarios shows that aquifer discharge to the nearby river would be very low after a 20-year period.

本研究构建了希腊东北部伊斯马里达（Ismarida）平原河流-含水层系统的区域水流模拟模型。本研究基于为期3年的野外调查结果，量化了该含水层系统的水均衡，并阐明了地下水的组成要素与该系统的特征。伊斯马里达湖平原的半承压含水层系统由未固结的三角洲碎屑沉积物构成，与沃斯沃齐斯（Vosvozis）河存在水力联系，分布面积达46.75 km²。研究区年降水量介于270~876 mm之间。区内分布有87眼密集布设的灌溉井，广泛服务于农业开发活动。本次研究采用MODFLOW模型对该含水层中的地下水流进行模拟，以实测水位数据开展模型校准，校准匹配效果极佳。为评估当前抽水方案的影响并提出优化解决方案，研究团队设计了4种管理情景并借助该模型开展模拟测试。基于模拟结果，地下水均衡模拟数据显示，需将抽水量降低约33%，方能遏制地下水位的大幅下降趋势。上述情景模拟结果表明，20年后含水层向邻近河流的排泄量将处于极低水平。