Effect of river boundary conditions on groundwater flow and solute transport during a flood event.

摘要: The dynamic of groundwater flow and the interactions between streams and aquifers can be highly influenced by extreme river stage fluctuations during floods. In groundwater models, extreme events represent a transient state in the boundary conditions which may affect groundwater flow and transport of solutes. The objective of this research is to understand the influence of the river boundary condition in the interaction between surface water and groundwater during a flood event considering a case study (Alz river, Germany). We used MODFLOW-2005 to develop a three-dimensional groundwater flow model. Additionally, MT3DMS and MODPATH were used to simulate dispersive and advective solute transport. Finally, we consider four hypothetical scenarios to evaluate the influence of the river stage and the riverbed conductance over groundwater flow and solute transport. The simulations show a large …