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Hydrological Responses to Land Use/Land Cover Changes in Koga Watershed, Upper Blue Nile, Ethiopia

Author

Listed:
  • Habitamu Alesew Ayele

    (Department of Hydraulic and Water Resources Engineering, Bule Hora University (BHU), Bule Hora P.O. Box 144, Ethiopia)

  • Alemu O. Aga

    (Department of Water Works Construction Technology, Faculty of Civil Technology, Ethiopia Technical University, 2RGF + MHJ, Addis Ababa P.O. Box 190310, Ethiopia)

  • Liuelsegad Belayneh

    (Department of Natural Resources Management, Arba Minch University, Arba Minch P.O. Box 21, Ethiopia)

  • Tilahun Wankie Wanjala

    (Department of Hydraulic and Water Resources Engineering, Bule Hora University (BHU), Bule Hora P.O. Box 144, Ethiopia)

Abstract

Information on land use and land cover modification and their related problems for the streamflow and sediment yield are crucial for spatial planners and stakeholders to devise suitable catchment resources management plans and strategies. This research sought to assess the changes in land use and land cover (LULC) effects on the streamflow and sediment yield of the Koga watershed. Landsat-5 TM, Landsat-7 ETM+, and Landsat-8 OLI data were used to create the land use and land cover maps. The LULC type identification analysis was performed by using ERDAS Imagine 2015. After the supervised classification, the land use and land cover maps for three distinct years (1991, 2008, and 2018) were generated, and the accuracy of the maps was reviewed. The LULC change analysis results were pointed out, as there was an appreciable LULC change in the study watershed. Agricultural land increased by 14.21% over the research period, whereas grassland decreased by 22.91%. The other LULC classes (built-up area, forest area, water body, and wetland) increased by 0.39%, 6.36%, 4.30%, and 0.46%, respectively. Contrarily, bushland decreased by 2.80%. Human activities were decisive in the significant land use alterations within the catchment. The flow rate of the river basin increased over the rainy season in the years 1991–2008 and declined in the drier months. The watershed’s sediment yield increased from 1991 to 2008 as a result of the extension of its agricultural area. Thus, the findings of this investigation demonstrated that the flow and sediment yield characteristics are changed because of the modifications within the LULC in the catchment. Some downstream and upstream parts of the area are exposed to comparatively high erosion, and the maximum amount of sediment is generated during the rainy season.

Suggested Citation

  • Habitamu Alesew Ayele & Alemu O. Aga & Liuelsegad Belayneh & Tilahun Wankie Wanjala, 2023. "Hydrological Responses to Land Use/Land Cover Changes in Koga Watershed, Upper Blue Nile, Ethiopia," Geographies, MDPI, vol. 3(1), pages 1-22, January.
    • Handle: RePEc:gam:jgeogr:v:3:y:2023:i:1:p:4-81:d:1031160
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    References listed on IDEAS

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