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The role of rainfall intensity and soil in determining rates of flow through cryoturbated chalk

Mahmood-ul-Hassan, M. and Gregory, P.J. (2008) The role of rainfall intensity and soil in determining rates of flow through cryoturbated chalk. Pakistan Journal of Scientific and Industrial Research, 51 (5). pp. 235-241. ISSN 0030-9885

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Official URL: http://www.pjsir.org/documents/journals/2705200923...

Abstract/Summary

The effects of different water application rates (3, 10, 15 and 30 mm/h) and of topsoil removal on the rate of downward water movement through the cryoturbated chalk zone in southern England were investigated in situ. During and after each application of water, changes in water content and matric potential of the profile were monitored and percolate was collected in troughs. The measured water breakthrough time showed that water moved to 1.2 m depth quickly (in 8.2 h) even with application rate as low as 3 mm/h and that the time was only 3 h when water was applied at a rate of 15 mm/ h. These breakthrough times were about 150 and 422 fold shorter, respectively, than those expected if the water had been conducted by the matrix alone. Percolate was collected in troughs within 3.5 h at 1.2 m depth when water was applied at 30 mm/h and the quantity collected indicated that a significant amount of the surface applied water moved downward through inter-aggregate pores. The small increase in volumetric water content (about 3%) in excess of matrix water content resulted in a large increase in pore water velocities, from 0.20 to 5.3 m/d. The presence of soil layer had effect on the time taken for water to travel through the cryoturbated chalk layer and in the soil layer, water took about 1-2 h to pass thorough, depending on the intensity.

Item Type:Article
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Walker Institute
Interdisciplinary centres and themes > Centre for Food Security
Faculty of Life Sciences > School of Agriculture, Policy and Development > Biodiversity, Crops and Agroecosystems Division > Crops Research Group
Interdisciplinary centres and themes > Soil Research Centre
ID Code:32013
Uncontrolled Keywords:pancreatin, bovine pancreas, amylase activity
Publisher:PCSIR-Scientific Information Centre

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