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The impact of upland land management on flooding: results from an improved pasture hillslope

By Miles R. Marshall, Oliver J. Francis, Zoë L. Frogbrook, Bethanna M. Jackson, Neil McIntyre, Brian Reynolds, Imogen Solloway, Howard S. Wheater and Joanne Chell

Abstract

In response to growing concern about impacts of upland agricultural land management on flood risk, an intensely instrumented experimental catchment has been established at Pontbren, a sheep-farmed headwater catchment of the River Severn, UK. Primary aims are to develop understanding of the processes governing flood generation and the associated impacts of land management practices, and to bridge the gap between process understanding and ability to predict effects on downstream flooding. To achieve this, the experiment is designed to operate at plot (100 m2), hillslope (0·1 km2) and small catchment scale (10 km2). Hillslope-scale data, from an under-drained, agriculturally improved pasture, show that drain flow is a dominant runoff process. However, depending on antecedent moisture conditions, overland flow may exceed drain flow rates and can be an important contributor to peak flow runoff at the hillslope-scale. Flow, soil tension data and tracer tests confirm the importance of macropores and presence of perched water tables under normal wet conditions. Comparisons of pasture runoff with that from within a 10 year-old tree shelterbelt show significantly reduced overland flow due to the presence of trees and/or absence of sheep. Comparisons of soil hydraulic properties show significant increases in hydraulic conductivity and saturated moisture content of soil under trees compared to adjacent improved pasture

Topics: Agriculture and Soil Science, Ecology and Environment
Year: 2009
DOI identifier: 10.1002/hyp.7157
OAI identifier: oai:nora.nerc.ac.uk:5879
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