Hydrological modelling of a drained grazing marsh under agricultural land use and the simulation of restoration management scenarios

The capability of the spatially-distributed, physically-based, rainfall-run off modelling system, MIRE SHE, to simulate the hydrological behaviour of t he natural and drained parts of the North Rent Grazing Marshes, UK, is inve stigated. The MIKE SHE code is applied to Bells Creek, a small, underdraine d, agricultural catchment located within the marshes. The model is used to both provide insights into the essential parameters that control the hydrol ogical processes in the catchment, and predict the influence of various, hy pothetical, water management strategies (land use and drainage) on pumped d ischarge and soil moisture storage in the catchment. The water table model predictions arising from these hypothetical scenarios are also compared aga inst field data obtained from on-going hydrological research on the neighbo uring, natural, Elmley Marshes. The comparison is found to be favourable. T he results of this study indicate the potential of the MIKE SHE system to s imulate the hydrological regime of these wetlands, and hence to play an imp ortant role as a tool that can assist environmental and conservation agenci es in the sound management of wetland resources.