Abstract
On four hillslopes in the loess region of The Netherlands pressure heads were monitored using stand alone measuring devices. During rain events pressure heads were measured regularly with time intervals of five minutes. Rainfall was recorded with a tipping bucket rainfall gauge. Two-dimensional simulations were executed to simulate water flow through these hillslopes during erosive rain events in summer and winter periods. From these simulations it appeared that vertical flow is dominant during rain events, and that lateral water transport is of minor importance despite distinct layer stratifications. During the selected rain showers, average lateral water movement varied between 1.6 and 4.7% of the total water displacement through the hillslopes. Therefore, it was decided to incorporate a one-dimensional water flow module into the event-based distributed soil erosion and hydrological model LISEM.
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