Database of African Theses and Dissertations including Research (DATAD-R)

Impacts of land cover change scenarios on storm runoff generation: a basis for management of the Nyando Basin, Kenya

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dc.creator Olang, L. O.
dc.creator Kundu, P.M.
dc.creator Ouma, G.
dc.creator Furst, J. 2012-10-11T12:14:18Z 2012-10-11T12:14:18Z 2012 2018-06-25T08:46:34Z 2018-06-25T08:46:34Z
dc.identifier Land degradation & development (2012)
dc.description Publisher version (Wiley Online)Hydrological Processes Volume 25, Issue 1, pages 80–89, 1 January 2011
dc.description The effects of conceptual land cover change scenarios on the generation of storm runoffs were evaluated in the Nyando Basin. The spatial scenarios represented alternatives that vary between full deforestation and reforestation. Synthetic storm events of depths 40, 60 and 80mm were formulated according to the rainfall patterns and assumed to have durations corresponding to the runoff times of concentration. The Natural Resource Conservation Service–Curve Number model was used to generate runoff volumes within the sub-catchments, which were subsequently routed downstream to obtain effects in the whole basin. The simulated land cover change impacts were evaluated relative to values obtained from the actual land cover state of the basin in the year 2000. From the results, an agricultural land cover scenario constituting of about 86 per cent of agriculture indicated increased runoff volumes in the entire basin by about 12 per cent. An agricultural-forested land cover scenario with 40 and 51 per cent of forest and agriculture respectively revealed reduced runoff volumes by about 12 per cent. Alternatively, a scenario depicting a largely forested land cover state with about 78 per cent of forests reduced the runoff volumes by about 25 per cent according to the model estimates. Runoff volumes in the basin were also likely to reduce by about 15 per cent if the appropriate land cover scenario for the respective sub-catchments were to be assumed for runoff management purposes. Considering the prevalent data uncertainty, the study effectively highlights the potential hydrological vulnerability of the basin. The results obtained can form a basis for appropriate catchment management of the area.
dc.language en
dc.publisher Wiley Online Library
dc.subject land cover change
dc.subject conceptual scenario
dc.subject hydrological model
dc.subject synthetic storm
dc.subject runoff event
dc.subject Nyando Basin
dc.subject catchment management
dc.subject Kenya
dc.title Impacts of land cover change scenarios on storm runoff generation: a basis for management of the Nyando Basin, Kenya
dc.type Article

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