Characterization of landuse and landcover dynamics and their impact on runoff generation patterns in dam catchments of Northern Ghana
Landuse alteration is a critical factor that exerts influence over hydrological mechanisms and the oversight of water resources across the globe. Northern Ghana is characterized by erratic rainfall, leading to the intense construction of small dams and dugouts. This study investigated historical lan...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2024-01-01
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| Series: | Geocarto International |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/10106049.2024.2335247 |
| _version_ | 1826938982796099584 |
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| author | Etienne Umukiza Felix K. Abagale Thomas Apusiga Adongo |
| author_facet | Etienne Umukiza Felix K. Abagale Thomas Apusiga Adongo |
| author_sort | Etienne Umukiza |
| collection | DOAJ |
| description | Landuse alteration is a critical factor that exerts influence over hydrological mechanisms and the oversight of water resources across the globe. Northern Ghana is characterized by erratic rainfall, leading to the intense construction of small dams and dugouts. This study investigated historical landuse/cover (LULC) changes and physical factors associated with surface runoff generation within eight (8) sub-catchments namely; Guno, Gbahali, Sambu, Duago, Denugo, Kwisini, Sandu, and Nyeko, with areas of 29.5, 110, 38.5, 106.04, 67.81, 2.59, 10.56 and 120.65 km2, respectively, located in four (4) regions of northern Ghana. For LULC change detection, historical satellite imagery and geospatial data were used with the aid of remote sensing and applying supervised maximum likelihood classification to Landsat images of 1995, 2005, 2015, and 2023. Runoff factors and depths were identified based on LULC classes, hydrologic soil groups, and precipitation conditions prevailing in the areas, based on the curve number (CN) method. With regards to LULC, the results from the overall analysis gave an insight into the rampant conversion, where grassland/mix vegetation witnessed significant declines, with decreases ranging from 150 to 395.25% in different catchments. Agricultural and arable lands emerged as the dominant landuse category, indicating a remarkable expansion of 11.61–51.17 km2, from 1995 to 2023 respectively, followed by built-up areas. While grassland decreased in all catchments over the same period, in some places, open tree (savannah woodland) increased, which confirmed the implementation of the afforestation policy. The CN values offered essential insights into the hydrological characteristics of each catchment. In addition to the impact of LULC and watershed characteristics on runoff, the observed variations in runoff patterns can be attributed to interannual variability in total annual precipitation which is critical driver of runoff. The findings hold significant importance for developing effective strategies and integrated watershed management policies to contribute to better water resource management and inform sustainable landuse planning in the face of changing environmental conditions. |
| first_indexed | 2024-04-24T11:10:33Z |
| format | Article |
| id | doaj.art-3aabdf342e23431ea52b2a3094e6d325 |
| institution | Directory Open Access Journal |
| issn | 1010-6049 1752-0762 |
| language | English |
| last_indexed | 2025-02-17T19:07:04Z |
| publishDate | 2024-01-01 |
| publisher | Taylor & Francis Group |
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| series | Geocarto International |
| spelling | doaj.art-3aabdf342e23431ea52b2a3094e6d3252024-12-10T08:23:09ZengTaylor & Francis GroupGeocarto International1010-60491752-07622024-01-0139110.1080/10106049.2024.2335247Characterization of landuse and landcover dynamics and their impact on runoff generation patterns in dam catchments of Northern GhanaEtienne Umukiza0Felix K. Abagale1Thomas Apusiga Adongo2West African Centre for Water, Irrigation and Sustainable Agriculture (WACWISA), University for Development Studies, Tamale, GhanaWest African Centre for Water, Irrigation and Sustainable Agriculture (WACWISA), University for Development Studies, Tamale, GhanaWest African Centre for Water, Irrigation and Sustainable Agriculture (WACWISA), University for Development Studies, Tamale, GhanaLanduse alteration is a critical factor that exerts influence over hydrological mechanisms and the oversight of water resources across the globe. Northern Ghana is characterized by erratic rainfall, leading to the intense construction of small dams and dugouts. This study investigated historical landuse/cover (LULC) changes and physical factors associated with surface runoff generation within eight (8) sub-catchments namely; Guno, Gbahali, Sambu, Duago, Denugo, Kwisini, Sandu, and Nyeko, with areas of 29.5, 110, 38.5, 106.04, 67.81, 2.59, 10.56 and 120.65 km2, respectively, located in four (4) regions of northern Ghana. For LULC change detection, historical satellite imagery and geospatial data were used with the aid of remote sensing and applying supervised maximum likelihood classification to Landsat images of 1995, 2005, 2015, and 2023. Runoff factors and depths were identified based on LULC classes, hydrologic soil groups, and precipitation conditions prevailing in the areas, based on the curve number (CN) method. With regards to LULC, the results from the overall analysis gave an insight into the rampant conversion, where grassland/mix vegetation witnessed significant declines, with decreases ranging from 150 to 395.25% in different catchments. Agricultural and arable lands emerged as the dominant landuse category, indicating a remarkable expansion of 11.61–51.17 km2, from 1995 to 2023 respectively, followed by built-up areas. While grassland decreased in all catchments over the same period, in some places, open tree (savannah woodland) increased, which confirmed the implementation of the afforestation policy. The CN values offered essential insights into the hydrological characteristics of each catchment. In addition to the impact of LULC and watershed characteristics on runoff, the observed variations in runoff patterns can be attributed to interannual variability in total annual precipitation which is critical driver of runoff. The findings hold significant importance for developing effective strategies and integrated watershed management policies to contribute to better water resource management and inform sustainable landuse planning in the face of changing environmental conditions.https://www.tandfonline.com/doi/10.1080/10106049.2024.2335247Landuse/cover dynamicsdam catchmentsdirect runoffrunoff drivers |
| spellingShingle | Etienne Umukiza Felix K. Abagale Thomas Apusiga Adongo Characterization of landuse and landcover dynamics and their impact on runoff generation patterns in dam catchments of Northern Ghana Geocarto International Landuse/cover dynamics dam catchments direct runoff runoff drivers |
| title | Characterization of landuse and landcover dynamics and their impact on runoff generation patterns in dam catchments of Northern Ghana |
| title_full | Characterization of landuse and landcover dynamics and their impact on runoff generation patterns in dam catchments of Northern Ghana |
| title_fullStr | Characterization of landuse and landcover dynamics and their impact on runoff generation patterns in dam catchments of Northern Ghana |
| title_full_unstemmed | Characterization of landuse and landcover dynamics and their impact on runoff generation patterns in dam catchments of Northern Ghana |
| title_short | Characterization of landuse and landcover dynamics and their impact on runoff generation patterns in dam catchments of Northern Ghana |
| title_sort | characterization of landuse and landcover dynamics and their impact on runoff generation patterns in dam catchments of northern ghana |
| topic | Landuse/cover dynamics dam catchments direct runoff runoff drivers |
| url | https://www.tandfonline.com/doi/10.1080/10106049.2024.2335247 |
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