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| Titel |
Hydrological processes and water resources management in a dryland environment II: Surface redistribution of rainfall within fields |
| VerfasserIn |
J. A. Butterworth, F. Mugabe, L. P. Simmonds, M. G. Hodnett |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 3, no. 3 ; Nr. 3, no. 3, S.333-343 |
| Datensatznummer |
250001084
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| Publikation (Nr.) |
 copernicus.org/hess-3-333-1999.pdf |
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| Zusammenfassung |
Soil water movement was studied within fields on two different soil types, a
red clay soil and a duplex soil of sand over clay, at the Romwe Catchment in
southern Zimbabwe. Each study site comprised two fields and formed a surface
water sub-catchment (1.0-2.4 ha) from which runoff was gauged. Soil moisture was
measured in-situ at up to 20 locations within each sub-catchment over an
entire cropping season and the following dry season. Maize was cultivated at
both sites according to the farmers' normal cropping practice and crop yields
were recorded.
Surface redistribution of rainfall through localised runon and runoff was shown
to be an important process in both sub-catchments with rainfall concentration
factors between 0.2 and 2.7 for major rainfall events. This process was a key
factor controlling deep drainage to groundwater. Results indicate that surface
water redistribution is of particular importance for groundwater recharge in
years with low or evenly distributed rainfall, when it would not otherwise have
occurred. The soil water conditions created by surface redistribution of
rainfall are also actively exploited by farmers who vary cropping practices
within fields to maximise crop yields and reduce the risks of crop failure. |
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