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Sediment yield modelling in the Mzimvubu River Catchment
Expanded Title:Siltation of river impoundments is a global phenomena which affects the capacity and the life expectancy of dams. The proposed development of the Ntabelanga Dam in the Mzimvubu catchment is prone to this phenomenon as large parts of the catchment consist of highly erodible soils with widespread evidence of soil erosion. However, the exact source of where the material is derived needs to be determined in order to inform land use management interventions upstream of the proposed dam. Most regional studies across the globe emphasize the sheet and rill aspects of the erosion cycle, but few map and/or model gully erosion at large spatial scales. This study models the major soil erosion processes in the catchment, as well as the sediment yield contribution from sheet-rill and gully erosion for the whole study area. Understanding these processes will enable area-specific management intervention and erosion control measures that are currently planned for the future dam site at Ntabelanga on the Tsitsa River. The study was undertaken using ArcSWAT and remote sensing techniques in an integrated GIS approach. The results produced a total sediment yield map of the Mzimvubu River Catchment, with an average of 5.0 t/ha•yr. In the Ntabelanga Dam Catchment the sediment yield range between 1 t/ha•yr upstream to 22.5 t/ha•yr at the future dam outlet. Based on the sediment yield results and digital elevation data in a GIS, the life expectancy of the dam could be between 34 and 49 years without proper siltation prevention or design measures.
Date Published:01/04/2015
Document Type:Research Report
Document Subjects:Water Resource Management/IWRM - Hydrogeology
Document Keywords:Hydrology, Water Quality
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2243/1/15
ISBN No:978-1-4312-0667-4
Authors:le Roux JJ; Barker CH; Weepener HL; van den Berg EC; Pretorious SN
Project No:K5/2243
Originator:WRC
Organizations:ARC; University of the Free State
Document Size:9 164 KB
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