hayal desta - Academia.edu (original) (raw)
Papers by hayal desta
City and environment interactions, Jun 1, 2024
Geoscience Letters, Nov 30, 2023
Ethiopia faces a significant challenge in combating soil erosion. This study addresses the concer... more Ethiopia faces a significant challenge in combating soil erosion. This study addresses the concern within Ada'a watershed of the Awash River basin. GIS and the Universal Soil Loss Equation (USLE) Model were used to predict soil loss and the sediment transport index (STI) in the Ada'a watershed of the Awash River basin. RUSLE model required intensive rainfall data registered continuously for 30 min, due to unavailability of this Rainfall data USLE model were preferred. Moreover, USLE model was chosen because of its straightforward methodology and accessibility to data. The study's objectives were to determine the mean annual soil loss rate, STI, and to identify and rank the most important erosion-prone spots for soil conservation planning. Using the interactive Spatial Analyst Tool Map Algebra Raster Calculator in the ArcGIS environment, the mean annual soil loss was estimated based on grid cells by multiplying the corresponding USLE factor values (R, K, LS, C, and P). The STI was also calculated on the Raster Calculator in ArcGIS using flow accumulation and slope gradients. The result shows that R, K, LS, C, and P factor values were estimated in the watershed as 344.9 to 879.65 MJ mm h − 1 year − 1, 0.11 to 0.38, 0% to 22.23%, 0 to 1, and 0.55 to 1, respectively. The overall annual soil loss in the watershed ranged from 0 to 457.4 tons ha − 1 year − 1. The Sediment Transport Index ranges from 0 to 856.193. The result implies there is increasing rate of soil losses and sediments observed at alarming rate. The highest rate of soil loss was found in the watershed's lowest parts. Accordingly, sustainable erosion control mechanisms based on topography and land use types are highly recommended, especially in the upper part of the watershed.
City and Environment Interactions
Environmental Systems Research
Introduction Public space development is important for the socio-economic and ecological conditio... more Introduction Public space development is important for the socio-economic and ecological conditions of cities. This study evaluated the publicness of riversides as public space development on the Kebena River in Addis Ababa, Ethiopia. The study identified the potentials and challenges of open spaces for public space development along the riversides of the Kebena River to increase the publicness of the riversides. Methods A comparative analysis of the publicness level of three selected open spaces along the riversides of Kebena River, namely, Wisdom Park, Minister Meda, and Agoza Meda, were done using the star model. Quantitative data were collected using site observations, document reviews, and questionnaire surveys with 169 interviewees. The land use and land cover (LULC) change detections were done for the years 2002 and 2020. Data were analyzed using SPSS, ArcGIS (Geographic Information Systems) software, and the Star model of the publicness analysis tool. Both qualitative and qu...
Environment, Development and Sustainability
City and Environment Interactions, 2022
Land Use Policy, 2020
Assessing land use and land cover (LULC) change in Lake Ziway watershed is important to evaluate ... more Assessing land use and land cover (LULC) change in Lake Ziway watershed is important to evaluate the degradation of ecosystems and their environmental processes caused by the ongoing increase in human pressures. The present study analyzed the long-term LULC dynamics in the Lake Ziway watershed, which covers 7300 km2 in the Ethiopian Central Rift Valley region. Three Landsat Satellite Image Series - Landsat MSS (1973), Landsat TM (1989) and Landsat Enhanced ETM+ (2018) - were the main input data from which three LULC maps were produced by employing Remote Sensing Techniques and Geographical Information Systems. The satellite data were supported by Google Earth and information gathered from informal discussions from local elderly people who are knowledgeable aboutthe area. The results over the last 45 years show that the major LULC changes in the study watershed have been the expansion of cultivated, agroforestry and settlement areas and the corresponding reduction in woodlands. Cultivation, agroforestry, and settlement LULC categories increased by 45%, 10.9%, and 141.4%, respectively. These changes are attributable to a combination of the ever increasing human population and the subsequent demands on environmental resources like agricultural lands, commercial and domestic fuelwood and charcoal. Other factors include poorly defined ownership arrangements and weak enforcement strategies on the existing land use policy. This has created open access mentalities among communities and intensified LULC changes in the watershed. Awareness raising and provision of technical training about conservation interventions should be provided to communities in the watershed.This study provides information for corrective measures to protect further degradation and irreversible losses that might happen to the biotic and abiotic resources in Lake Ziway watershed.
Land, 2019
Urban development is occurring in many Sub-Saharan Africa cities and rapid urbanization is underw... more Urban development is occurring in many Sub-Saharan Africa cities and rapid urbanization is underway in the East African city of Addis Ababa, Ethiopia. In an effort to address urban poverty and increase homeownership opportunities for low and middle-income residents, the City Administration of Addis Ababa initiated a large-scale housing development project in 2005. The project has resulted in the completion of 175,000 units within the city with 132,000 more under construction. To understand the impacts of both rapid growth and the housing program’s impact on the city’s urban form, we compared the type and distribution of land uses in Addis Ababa, Ethiopia, between 2006 with 2016 using hand-digitized, ortho-rectified satellite images in Geographic Information Systems (GISs). While residential density has increased, overall density has decreased from 109 people/ha to 98 people/ha. We found that between 2006 and 2016, land occupied by residential housing increased from 33% to 39% and th...
Environment, Development and Sustainability, 2019
This study provides local perspectives on water use and conservation of Lake Ziway and its waters... more This study provides local perspectives on water use and conservation of Lake Ziway and its watershed in Ethiopia. Past and present water use, management and conservation efforts are investigated, and causes to the lake's current degradation are presented. The study is based on empirical data gathered through face-to-face interviews with experts from federal, regional and district state offices, research center, and local economy and conservation groups. The results show that the water quality and water level of Lake Ziway have been decreasing due to anthropogenic factors. The main causes are attributed to uncontrolled water abstraction from the lake, discharge reduction from feeder rivers, siltation due to deforestation-induced soil erosion in the watershed, and effluent discharges from floriculture industries as well as agrochemical runoff. Water use and discharge influx is not regulated or planned. A good number of interviewees perceived that the state's effort to address the problems of Lake Ziway and its watershed is weak. This study contributes to the understanding of the local socio-ecological coherences and environmental problems Lake Ziway and its watershed are facing. It also provides firsthand information that can contribute to the development of long-term sustainable water use and conservation strategies for the lake and its watershed, which could also be applied to other lakes in Ethiopia, and beyond.
Limnologica, 2017
Abstract The article examines how heads of farmers’ households perceive the socioeconomic benefit... more Abstract The article examines how heads of farmers’ households perceive the socioeconomic benefits of Lake Ziway (Ethiopia), the causes of its current degradation, and the state of land and water use management in its watershed. The investigation was based on in-depth empirical field work including a survey with 635 heads of smallholder farmers’ households via interview using semi-structured questionnaires. Further, water abstraction was estimated from three districts that border with the lake. Respondents believe that Lake Ziway provides a number of individual and collective benefits for local communities, private companies and public institution. They stated, however, that the lake is under pressure from the floriculture industry and other investment projects, high population growth and subsequent expansion of settlements and irrigation farms, high applications of agrochemicals, soil erosion, uncontrolled water abstraction, and deforestation in the watershed. The respondents further believe that these activities are degrading the lake water quality, shrinking its water volume and decreasing its fish population. After examining government’s efforts to address these activities, the majority of respondents believe that the government role in the whole watershed is weak. This study contributes to better understand the local socio-ecological coherences and the problems Lake Ziway and its watershed are facing. It also provides information regarding long-term sustainable land and water use planning strategies for the lake and management of its watershed, which could also be applied to other lakes in Ethiopia, and beyond.
Lakes & Reservoirs: Science, Policy and Management for Sustainable Use, 2015
Lake Ziway in Ethiopia is a freshwater lake supporting multitude uses, including irrigation, fish... more Lake Ziway in Ethiopia is a freshwater lake supporting multitude uses, including irrigation, fishing, water supply and recreation. However, the lake is being degraded primarily because of various land- and water-use activities in its watershed. Recognizing these human impacts on the lake's water quality and quantity, the perceptions of school students were surveyed under the belief that the future of the lake is largely dependent on this younger generation. The goal of this study was to better understand how students actually recognize the extent to which various human activities impact the water quantity and quality of Lake Ziway. As major stakeholders in their communities, the perceptions of school students from four high schools regarding the changes to the lake over time were investigated. Students were contacted by purposive sampling, based on criteria of student academic performances, and their proximity to the lake. Their perceptions were studied on the basis of an interview survey. The majority of students indicated that high levels of human activities, especially water abstractions and water pollution, were the main lake impacts. Students believe there is a lack of sustainable utilization and protection of the lake. They suggested coordinated activities among all lake stakeholders in the participation and decision-making process to properly manage the lake. Provision of awareness to both local administrations and local communities, concern for establishing an appropriate regulatory body and allocating a sufficient budget, and strict controls on flower farm practices in the lakeshore, also was considered to be of high priority as a means of conserving the sustainability of the lake. The result derived from this survey has important implications for facilitating improved school curricula, and for federal, regional and district level water resource management authorities, in setting priorities and developing policies for the sustainability of Lake Ziway.
Lakes & Reservoirs: Research & Management, 2015
Environment, Development and Sustainability
Limnologica - Ecology and Management of Inland Waters
City and environment interactions, Jun 1, 2024
Geoscience Letters, Nov 30, 2023
Ethiopia faces a significant challenge in combating soil erosion. This study addresses the concer... more Ethiopia faces a significant challenge in combating soil erosion. This study addresses the concern within Ada'a watershed of the Awash River basin. GIS and the Universal Soil Loss Equation (USLE) Model were used to predict soil loss and the sediment transport index (STI) in the Ada'a watershed of the Awash River basin. RUSLE model required intensive rainfall data registered continuously for 30 min, due to unavailability of this Rainfall data USLE model were preferred. Moreover, USLE model was chosen because of its straightforward methodology and accessibility to data. The study's objectives were to determine the mean annual soil loss rate, STI, and to identify and rank the most important erosion-prone spots for soil conservation planning. Using the interactive Spatial Analyst Tool Map Algebra Raster Calculator in the ArcGIS environment, the mean annual soil loss was estimated based on grid cells by multiplying the corresponding USLE factor values (R, K, LS, C, and P). The STI was also calculated on the Raster Calculator in ArcGIS using flow accumulation and slope gradients. The result shows that R, K, LS, C, and P factor values were estimated in the watershed as 344.9 to 879.65 MJ mm h − 1 year − 1, 0.11 to 0.38, 0% to 22.23%, 0 to 1, and 0.55 to 1, respectively. The overall annual soil loss in the watershed ranged from 0 to 457.4 tons ha − 1 year − 1. The Sediment Transport Index ranges from 0 to 856.193. The result implies there is increasing rate of soil losses and sediments observed at alarming rate. The highest rate of soil loss was found in the watershed's lowest parts. Accordingly, sustainable erosion control mechanisms based on topography and land use types are highly recommended, especially in the upper part of the watershed.
City and Environment Interactions
Environmental Systems Research
Introduction Public space development is important for the socio-economic and ecological conditio... more Introduction Public space development is important for the socio-economic and ecological conditions of cities. This study evaluated the publicness of riversides as public space development on the Kebena River in Addis Ababa, Ethiopia. The study identified the potentials and challenges of open spaces for public space development along the riversides of the Kebena River to increase the publicness of the riversides. Methods A comparative analysis of the publicness level of three selected open spaces along the riversides of Kebena River, namely, Wisdom Park, Minister Meda, and Agoza Meda, were done using the star model. Quantitative data were collected using site observations, document reviews, and questionnaire surveys with 169 interviewees. The land use and land cover (LULC) change detections were done for the years 2002 and 2020. Data were analyzed using SPSS, ArcGIS (Geographic Information Systems) software, and the Star model of the publicness analysis tool. Both qualitative and qu...
Environment, Development and Sustainability
City and Environment Interactions, 2022
Land Use Policy, 2020
Assessing land use and land cover (LULC) change in Lake Ziway watershed is important to evaluate ... more Assessing land use and land cover (LULC) change in Lake Ziway watershed is important to evaluate the degradation of ecosystems and their environmental processes caused by the ongoing increase in human pressures. The present study analyzed the long-term LULC dynamics in the Lake Ziway watershed, which covers 7300 km2 in the Ethiopian Central Rift Valley region. Three Landsat Satellite Image Series - Landsat MSS (1973), Landsat TM (1989) and Landsat Enhanced ETM+ (2018) - were the main input data from which three LULC maps were produced by employing Remote Sensing Techniques and Geographical Information Systems. The satellite data were supported by Google Earth and information gathered from informal discussions from local elderly people who are knowledgeable aboutthe area. The results over the last 45 years show that the major LULC changes in the study watershed have been the expansion of cultivated, agroforestry and settlement areas and the corresponding reduction in woodlands. Cultivation, agroforestry, and settlement LULC categories increased by 45%, 10.9%, and 141.4%, respectively. These changes are attributable to a combination of the ever increasing human population and the subsequent demands on environmental resources like agricultural lands, commercial and domestic fuelwood and charcoal. Other factors include poorly defined ownership arrangements and weak enforcement strategies on the existing land use policy. This has created open access mentalities among communities and intensified LULC changes in the watershed. Awareness raising and provision of technical training about conservation interventions should be provided to communities in the watershed.This study provides information for corrective measures to protect further degradation and irreversible losses that might happen to the biotic and abiotic resources in Lake Ziway watershed.
Land, 2019
Urban development is occurring in many Sub-Saharan Africa cities and rapid urbanization is underw... more Urban development is occurring in many Sub-Saharan Africa cities and rapid urbanization is underway in the East African city of Addis Ababa, Ethiopia. In an effort to address urban poverty and increase homeownership opportunities for low and middle-income residents, the City Administration of Addis Ababa initiated a large-scale housing development project in 2005. The project has resulted in the completion of 175,000 units within the city with 132,000 more under construction. To understand the impacts of both rapid growth and the housing program’s impact on the city’s urban form, we compared the type and distribution of land uses in Addis Ababa, Ethiopia, between 2006 with 2016 using hand-digitized, ortho-rectified satellite images in Geographic Information Systems (GISs). While residential density has increased, overall density has decreased from 109 people/ha to 98 people/ha. We found that between 2006 and 2016, land occupied by residential housing increased from 33% to 39% and th...
Environment, Development and Sustainability, 2019
This study provides local perspectives on water use and conservation of Lake Ziway and its waters... more This study provides local perspectives on water use and conservation of Lake Ziway and its watershed in Ethiopia. Past and present water use, management and conservation efforts are investigated, and causes to the lake's current degradation are presented. The study is based on empirical data gathered through face-to-face interviews with experts from federal, regional and district state offices, research center, and local economy and conservation groups. The results show that the water quality and water level of Lake Ziway have been decreasing due to anthropogenic factors. The main causes are attributed to uncontrolled water abstraction from the lake, discharge reduction from feeder rivers, siltation due to deforestation-induced soil erosion in the watershed, and effluent discharges from floriculture industries as well as agrochemical runoff. Water use and discharge influx is not regulated or planned. A good number of interviewees perceived that the state's effort to address the problems of Lake Ziway and its watershed is weak. This study contributes to the understanding of the local socio-ecological coherences and environmental problems Lake Ziway and its watershed are facing. It also provides firsthand information that can contribute to the development of long-term sustainable water use and conservation strategies for the lake and its watershed, which could also be applied to other lakes in Ethiopia, and beyond.
Limnologica, 2017
Abstract The article examines how heads of farmers’ households perceive the socioeconomic benefit... more Abstract The article examines how heads of farmers’ households perceive the socioeconomic benefits of Lake Ziway (Ethiopia), the causes of its current degradation, and the state of land and water use management in its watershed. The investigation was based on in-depth empirical field work including a survey with 635 heads of smallholder farmers’ households via interview using semi-structured questionnaires. Further, water abstraction was estimated from three districts that border with the lake. Respondents believe that Lake Ziway provides a number of individual and collective benefits for local communities, private companies and public institution. They stated, however, that the lake is under pressure from the floriculture industry and other investment projects, high population growth and subsequent expansion of settlements and irrigation farms, high applications of agrochemicals, soil erosion, uncontrolled water abstraction, and deforestation in the watershed. The respondents further believe that these activities are degrading the lake water quality, shrinking its water volume and decreasing its fish population. After examining government’s efforts to address these activities, the majority of respondents believe that the government role in the whole watershed is weak. This study contributes to better understand the local socio-ecological coherences and the problems Lake Ziway and its watershed are facing. It also provides information regarding long-term sustainable land and water use planning strategies for the lake and management of its watershed, which could also be applied to other lakes in Ethiopia, and beyond.
Lakes & Reservoirs: Science, Policy and Management for Sustainable Use, 2015
Lake Ziway in Ethiopia is a freshwater lake supporting multitude uses, including irrigation, fish... more Lake Ziway in Ethiopia is a freshwater lake supporting multitude uses, including irrigation, fishing, water supply and recreation. However, the lake is being degraded primarily because of various land- and water-use activities in its watershed. Recognizing these human impacts on the lake's water quality and quantity, the perceptions of school students were surveyed under the belief that the future of the lake is largely dependent on this younger generation. The goal of this study was to better understand how students actually recognize the extent to which various human activities impact the water quantity and quality of Lake Ziway. As major stakeholders in their communities, the perceptions of school students from four high schools regarding the changes to the lake over time were investigated. Students were contacted by purposive sampling, based on criteria of student academic performances, and their proximity to the lake. Their perceptions were studied on the basis of an interview survey. The majority of students indicated that high levels of human activities, especially water abstractions and water pollution, were the main lake impacts. Students believe there is a lack of sustainable utilization and protection of the lake. They suggested coordinated activities among all lake stakeholders in the participation and decision-making process to properly manage the lake. Provision of awareness to both local administrations and local communities, concern for establishing an appropriate regulatory body and allocating a sufficient budget, and strict controls on flower farm practices in the lakeshore, also was considered to be of high priority as a means of conserving the sustainability of the lake. The result derived from this survey has important implications for facilitating improved school curricula, and for federal, regional and district level water resource management authorities, in setting priorities and developing policies for the sustainability of Lake Ziway.
Lakes & Reservoirs: Research & Management, 2015
Environment, Development and Sustainability
Limnologica - Ecology and Management of Inland Waters