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- W2047921640 abstract "This paper describes the application of a simple model to investigate the groundwater movement of a wet grassland in Southeast England. The wetland is subject to an agri-environmental scheme, which specifies the manipulation of ditch water levels to promote high water tables for ecological purposes. Field data from the North Kent Marshes are input to the model Drain Interaction with Channel Hydrology (DITCH) to simulate groundwater change and to quantify recharge from a ditch to the adjacent land parcel. The area is covered with an alluvial clay soil, and a low value of hydraulic conductivity was computed using the Guelph permeameter. The seasonal change of groundwater occurred at faster rates than the hydraulic conductivity suggesting macropore flow. In DITCH, specific yield is used as a measure of macropore flow. Sensitivity analysis of specific yield is subject to a six-step evaluation and shows that a value of 0.15 is optimal, more characteristic of a silt than a clay soil. The model output shows non-coupling between the ditch water level and groundwater in the adjacent parcel of land, with negligible recharge from the ditch; despite the maintenance of high ditch water levels, the dominant hydrological fluxes are vertical. It is concluded that the standard management practise of maintaining high ditch water levels to encourage lateral water movement through the soil matrix is not effective in this wet grassland." @default.
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- W2047921640 date "2003-10-01" @default.
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- W2047921640 title "Impact of ditch management on the water levels of a wet grassland in Southeast England" @default.
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- W2047921640 doi "https://doi.org/10.1016/s0167-8809(03)00201-9" @default.
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