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Land use and land cover changes and Soil erosion in Yezat Watershed,North Western Ethiopia

International Soil and Water Conservation Research 2017年第2期5卷 85-94页

作者： Lemlem Tadesse k.v.suryabhagavan G.Sridhar Gizachew Legesse School of Earth Sciences Addis Ababa UniversityP.O.Box 1176Addis AbabaEthiopia International Crops Research Institute for the Semi-Arid Tropics(ICRISAT) P.O.Box 5689Addis AbabaEthiopia

Soil erosion affects land qualities and water *** problem is severe in Ethiopia due to its topographic *** present research was aimed to estimate spatiotemporal changes in land-use/land-cover pattern and soil erosion in the Yezat watershed in *** study was carried out by using landsat imageries of 2001,2010 and *** were classified into categories using supervised classification by maximum likelihood *** were also classified into different biomass levels by using Normalized Difference vegetation Index(NDvI)*** Universal Soil Loss Equation modeling was applied in a GIS environment to quantify the potential soil erosion *** area under grassland,woodland and homesteads have increased by 610.69(4%),101.69(0.67%)and 126.6 ha(0.83%)during *** extent of cultivated land and shrub/bushland was reduced by 323.43(0.02%)and 515.44 ha(3.41%),respectively,during the same *** vegetation cover in the watershed decreased by 91% during 2001-2010,and increased by 88% during *** of NDvI values indicates better ground cover due to implementation of integrated watershed development program in the *** estimated annual soil losses were 7.2 t ha^(-1) yr^(-1) in 2001,7.7t ha^(-1) yr^(-1) in 2010 and 4.8t ha^(-1) yr^(-1) in *** interventions are necessary to improve the status and utilization of watershed resources in response to sustainable land management practices for sustainable livelihood of the local people.

关键词： Biomass GIS NDvI Land-use and land-cover Remote sensing RUSLE

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Geo-Spatial Approach for Urban Green Space and Environmental Quality Assessment: A Case Study in Addis Ababa City

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Journal of Geographic Information System 2017年第2期9卷 191-206页

作者： Roza Assaye k. v. suryabhagavan M. Balakrishnan S. Hameed School of Earth Sciences Addis Ababa University Addis Ababa Ethiopia Department of Zoological Sciences Addis Ababa University Addis Ababa Ethiopia College of Science Sultan Qaboos University Muscat Oman

Depending on the rapid growth in infrastructural developments along with the increasing of human population, quality of cities is being deteriorated globally. Assurance of environmental quality is essential for urban planning and developments. This paper presents the potential application of urban green areas as an indicator of urban environmental quality in Addis Ababa, Ethiopia based on indicators of natural parameters extracted from remotely sensed images, and socio-economic variables derived from census data. Physical environmental variables such as land-use/land-cover data, surface temperature, normalized difference vegetation index, and transformed remote sensing variables derived from three landsat images of 1986, 2000 and 2015 were analyzed for the present study. Socio-economic variables including population density and greenhouse gas emission in 2012 were used. Regression analysis, factor analysis and overlay analysis were performed after the two groups of variables were integrated. Four factors such as greenness, crowd, heat island and greenhouse gas emission were used for interpretation. By assigning different weights to each of these factors and proportion of green areas, land-use/land-cover map, environmental risk map and environmental quality index map were generated. The results show deterioration of environmental quality in the study area. It is recommended that future studies should include more parameters to provide a holistic view of the changes in greenness of the city and to try to mitigate adverse effects of development activities leading to human density and depletion of green area in the city.

关键词： GIS Landsat NDvI Spatiotemporal Distribution Urban Green Space

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