Impacts of landuse changes on surface runoff and groundwater recharge at forest sites

摘要

The occurrence of floods with their high economic damages forced hydrological research to take steps in order to decrease their impacts. In a current research project the effects of different forestal and hydrological measures on water dynamics are examined and subsequently modelled by the physically based precipitation-runoff-model CATFLOW (Maurer 1997a,b and Zehe 1999). The objective is to get an applicable tool for predicting surface runoff depending on landuse changes at forests. For that purpose two different forest sites were chosen to yield survey input and validation data for the simulation model. Results show a dominant influence of soil hydraulic parameters. Accordingly changes in these parameters (e.g. by management of forestry) also have a major impact on model results. Besides there is a distinct dependence of water dynamics within the ecosystem on field morphology, canopy cover and climate, especially on precipitation.