Groundwater–surface water interaction: Process understanding, conceptualization and modelling pages:46-53
IUGG2007 location:Perugia date:July 2007
Measurements of streambed temperature profiles are used to determine the vertical advective flow of water in the hyporheic zone in a Belgian lowland river. Quasi-steady-state simulations were performed with a one-dimensional heat transport equation introduced in the ecosystem modelling platform FEMME and then spatially interpolated. Measurement campaigns were performed in the winter season when a quasi steady-state thermal condition can be assumed. This allows an estimation of the mass balance of groundwater–surface water exchange in the study area. The results were compared with a steady-state MODFLOW 2000 simulation for the winter of 2004. Results show higher discharge in the upper reaches of the section and lower values in the downstream section of the river. Dependent probably on the water level of the river, the downstream section changes in time from gaining to losing.