Dynamics of land use and land cover and its effects on hydrologic responses: case study of the Gilgel Tekeze catchment in the highlands of Northern Ethiopia
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- 作者：Nigussie Haregeweyn (1) (2)
Samuel Tesfaye (2)
Atsushi Tsunekawa (1)
Mitsuru Tsubo (3)
Derege Tsegaye Meshesha (1)
Enyew Adgo (4)
Asres Elias (5) - 关键词：Land use and land cover ; Hydrologic response ; WetSpa ; Integrated catchment management ; Northern Ethiopia
- 刊名：Environmental Monitoring and Assessment
- 出版年：2015
- 出版时间：January 2015
- 年：2015
- 卷：187
- 期：1
- 全文大小：1,792 KB
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Samuel Tesfaye (2)
Atsushi Tsunekawa (1)
Mitsuru Tsubo (3)
Derege Tsegaye Meshesha (1)
Enyew Adgo (4)
Asres Elias (5)
1. Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori, 680-0001, Japan
2. Department of Land Resources Management and Environmental Protection, Mekelle University, Mekelle, Ethiopia
3. Institute for Soil, Climate and Water, Agricultural Research Council, Pretoria, 0083, South Africa
4. Bahir Dar University, Bahir Dar, Ethiopia
5. The United Graduate School of Agricultural Sciences, Tottori University, Tottori, Japan - ISSN：1573-2959
文摘
Unprecedented land use and land cover (LULC) changes in the Gilgel Tekeze catchment of the upper Nile River basin in Ethiopia may have far-reaching consequences for the long-term sustainability of the natural resources base. This study analyzed the dynamics and hydrologic effects of LULC changes between 1976 and 2003 as shown in satellite imagery. The effects of these LULC changes on the hydrologic response were investigated using the WetSpa model to estimate spatially distributed average annual evapotranspiration, surface runoff, and groundwater recharge. Digital image analysis revealed major increments of cultivated land and settlements of 15.4 and 9.9?%, respectively, at the expense of shrubland and grazing lands. Population growth and the associated demand for land were found to be the major driving forces. The WetSpa simulation showed an increase in annual surface runoff of 101?mm and a decrease in groundwater recharge of 39?mm over the period 1976-003. These results signify an increasing threat of moisture unavailability in the study area and suggest that appropriate land management measures under the framework of the integrated catchment management (ICM) approach are urgently needed.