Modelling soil erosion potential in the transboundary (Kenya & Tanzania) catchment of river Umba using remotely sensed data

N. Koedam, B. Mutisya, J. Kairo, Jane Njeri Resink-Ndungu, M. Kervyn

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Abstract

Soil erosion is one of the leading forms of soil degradation. Estimating soil erosion from field measurements is expensive hence the extent of soil erosion in many tropical watersheds is unknown. Erosion is a complex process; some of the eroded materials are deposited within the watershed while the rest is transported through waterways into lakes and lowland areas at the coast. The use of remotely sensed data and GIS provide a quick and reliable method to model, estimate, and monitor erosions over large areas even in data deficient tropical areas. In this study, Revised Universal Soil Loss Equation (RUSLE) model is being used to model soil erosion potential in a transboundary catchment of River Umba in Kenya and Tanzania. Data derived from MODIS (land cover), TRMM (rainfall), SRTM (elevation) and FAO (soil map) are processed in GIS environment for use in the model. Preliminary results, including; rainfall and run off erosivity (400 – 1700 MJ mm ha-1 h-1 yr-1), soil erodibility (0.018 – 0.025 t ha h ha-1 MJ-1 mm-1), slope length and steepness (0 – 1338), and vegetation cover factor (0.001 – 0.2) will be overlaid to predict the potential soil lost from the catchment annually. Results of this work will provide information on the extent of soil erosion in the catchment which has adverse effect on critical marine habitats. This information is key for policy makers and scientific community in making sound management decisions.Keywords: soil erosion; RUSLE; remote sensing; transboundary; critical habitats.
Original languageEnglish
Pages62-62
Publication statusPublished - 2017
Event10th WIOMSA Scientific Symposium 2017 - Dar es Salaam, Tanzania, United Republic of
Duration: 30 Oct 20174 Nov 2017
Conference number: 10

Conference

Conference10th WIOMSA Scientific Symposium 2017
CountryTanzania, United Republic of
CityDar es Salaam
Period30/10/174/11/17

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