GroMoPo Metadata for Elbe River Valley embankment model

Ecosystems in river valleys are affected mainly by the hydraulic conditions in wetlands including groundwater dynamics. The quantitative prediction of changes in groundwater dynamics caused by river embankment relocation requires numerical modelling using a physically-based approach. Groundwater recharge from the intermittently flooded river plains was determined by a leakage approach considering soil hydraulic properties. For the study area in the Elbe river valley north of Magdeburg, Germany, a calibrated groundwater flow model was established and the groundwater dynamics for the present situation as well as for the case of embankment relocation were simulated over a 14-year time period. Changes in groundwater depth derived from simulated groundwater levels occurred only during flood periods. By analysing the spatial distributions of changes in statistical parameters, those areas with significant impact on the ecosystems by embankment relocation can be determined.

河谷生态系统主要受湿地水文条件（包括地下水动态）的影响。针对河堤迁建引发的地下水动态变化进行定量预测，需采用基于物理过程的方法开展数值模拟。通过考虑土壤水力特性的渗漏法，可确定间歇性漫溢河漫滩的地下水补给量。针对德国马格德堡以北易北河谷的研究区域，研究人员建立了经过率定的地下水流模型，并对现状情景及河堤迁建情景下的地下水动态开展了为期14年的模拟。由模拟地下水位推导得到的地下水埋深变化仅发生在洪水时段。通过分析统计参数变化的空间分布特征，即可确定河堤迁建对生态系统产生显著影响的区域。