Impact Assessment of Alternate Land Cover and Management Practices on Soil Erosion: A Case Study

Author(s):  
T. R. Nayak ◽  
R. K. Jaiswal ◽  
R. V. Galkate ◽  
T. Thomas
Author(s):  
Veljko Perović ◽  
Darko Jakšić ◽  
Darko Jaramaz ◽  
Nikola Koković ◽  
Dragan Čakmak ◽  
...  

2016 ◽  
Vol 58 (5) ◽  
pp. 889-905 ◽  
Author(s):  
Ayele Almaw Fenta ◽  
Hiroshi Yasuda ◽  
Katsuyuki Shimizu ◽  
Nigussie Haregeweyn ◽  
Aklilu Negussie

2019 ◽  
Author(s):  
Abreham Berta Aneseyee

Abstract Background: Information on soil loss and sediment export is essential to identify hotspots of soil erosion for conservation interventions in a given watershed. This study aims at investigating the dynamic of soil loss and sediment export associated with land use/land cover change and identifies soil loss hotspot areas in Winike watershed of Omo-gibe basin of Ethiopia. Spatial data collected from satellite images, topographic maps, meteorological and soil data were analyzed. Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) of sediment delivery ratio (SDR) model was used based on analysis of land use/land cover maps and RUSLE factors. Result: The results showed that total soil loss increased from 774.86 thousand tons in 1988 to 951.21 thousand tons in 2018 while the corresponding sediment export increased by 3.85 thousand tons in the same period. These were subsequently investigated in each land-use type. Cultivated fields generated the highest soil erosion rate, which increased by 10.02 t/ha/year in 1988 to 43.48 t/ha/year in 2018. This corresponds with the expansion of the cultivated area that increased from 44.95 thousand ha in 1988 to 59.79 thousand ha in 2018. This is logical as the correlation between soil loss and sediment delivery and expansion of cultivated area is highly significant (p<0.01). Sub-watershed six (SW-6) generated the highest soil loss (62.77 t/ha/year) and sediment export 16.69 t/ha/year, followed by Sub-watershed ten (SW-10) that are situated in the upland plateau. Conversely, the lower reaches of the watershed are under dense vegetation cover and experiencing less erosion. Conclusion: Overall, the changes in land use/land cover affect significantly the soil erosion and sediment export dynamism. This research is used to identify an area to prioritize the watershed for immediate management practices. Thus, land use policy measures need to be enforced to protect the hydropower generation dams at downstream and the ecosystem at the watershed.


2010 ◽  
Vol 4 (4) ◽  
pp. 379-386 ◽  
Author(s):  
Nasir Gebi Tukura ◽  
Mahmud Mustefa Akalu

Soil erosion is a major environmental and economic concern affecting all continents around the world. Soil loss facilitates land degradation, threatening both agricultural and natural environments. This problem is severe in Ethiopia due to its topographic features. To evaluate the effect of land use and land cover changes on soil erosion, we studied land use changes of the Hanger River watershed, NW Ethiopia, from 2005 to 2017, using remote sensing and estimating soil erosion using the Revised Universal Soil Loss Equation. The results of land-cover changes have revealed a decrease in open forest areas, grazing land, shrub land and grass land by 33.16%, 9.20 %, 3.22 %, and 7.62 %, respectively in a fourteen years period. In the same period, there was an increase in agricultural areas by 48.73 % and dense forest by 4.74 %. The estimated mean soil erosion potential in Hanger River watershed, between 2005 and 2017, was about 55.5 and 70.5 t ha-1 year-1, respectively. For the High and Very high classes, the values increased from 33.40% to 35.74% and 6.36% to 12.81%, respectively from 2005 to 2017.Therefore, it can be concluded that there is an increasing tendency for soil erosion in the area due to changes in land cover, particularly deforestation due to agricultural land expansion. This trend should receive attention aiming to keep the stability and sustainability of this ecosystem in the future. Management interventions are necessary to improve the status and utilization of watershed resources by applying sustainable land management practices for sustainable livelihood of the local people. AVALIAÇÃO DE RISCOS DE EROSÃO DO SOLO DEVIDO A ALTERAÇÕES DO USO DO SOLO/ COBERTURA DO SOLO (LULC), NA BACIA DO RIO HANGAR, NOROESTE DA ETIÓPIAResumoA erosão do solo suscita uma grande preocupação ambiental e econômica e afeta todos os continentes. A perda de solo facilita a degradação da terra, ameaçando ambientes agrícolas e naturais. Este problema é grave na Etiópia devido às suas características topográficas. Para avaliar o efeito das mudanças no uso e cobertura da terra na erosão do solo, estudamos as mudanças no uso da bacia hidrográfica do Rio Hanger, no noroeste da Etiópia, de 2005 a 2017, usando sensoriamento remoto e estimando a erosão do solo com a Equação Universal de Perda de Solo Revisada. Os resultados das mudanças na cobertura da terra revelaram uma diminuição nas áreas de florestas abertas, pastagens, arbustos e pastagens em 33,16%, 9,20%, 3,22% e 7,62%, respectivamente, em um período de catorze anos. No mesmo período, houve um aumento nas áreas agrícolas em 48,73% e na floresta densa em 4,74%. O potencial médio estimado de erosão do solo na bacia hidrográfica do Rio Hanger, entre 2005 e 2017, foi de cerca de 55,5 e 70,5 t ha-1 ano-1, respectivamente. Para as classes Alta e Muito Alta, os valores aumentaram de 33,40% para 35,74% e 6,36% para 12,81%, respectivamente, de 2005 a 2017.Portanto, pode-se concluir que há uma tendência crescente de erosão do solo na área de estudo devido a mudanças na cobertura da terra, particularmente desmatamento, na sequência da expansão da terra agrícola. A referida tendência deve ser acompanhada, com o objetivo de se tomarem medidas adequadas que permitam manter a estabilidade e a sustentabilidade do ecossistema no futuro. É, pois, necessário adotar medidas de gestão adequadas a fim de se poder melhorar o status e a utilização dos recursos da bacia hidrográfica do Rio Hanger, aplicando práticas sustentáveis de manejo da terra para a subsistência sustentável da população local. Palavras-chave: SIG. Bacia Hidrográfica. Mudanças no uso e cobertura da terra. RUSLE. Erosão do solo.


2011 ◽  
Vol 39 (4) ◽  
pp. 603-603
Author(s):  
Ramprasad Naik Desavathu ◽  
Suryaprakasarao Bosukonda ◽  
Mrutyunjayareddy Kamireddy

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Alemu Beyene Woldesenbet ◽  
Sebsebe Demisew Wudmatas ◽  
Mekuria Argaw Denboba ◽  
Azage Gebreyohannes Gebremariam

Abstract Background Water erosion, upland degradation and deforestation are key environmental problems in the Meki river watershed. The study assessed the land use land cover change (LULCC) for 30 years and it examined the contribution of indigenous Enset-based land use system (EBLUS) to reduce soil erosion and prevent water bodies including Lake Ziway from sedimentation which was not considered in the former studies. GPS based data collected and satellite based LULC analysis using ERDAS Imagine 2014 performed to investigate existing farm management practices and land cover respectively. HEC-GEOHMS, Geo-statistical interpolation and RUSLE were applied to model watershed characteristics, spatial climate parameters and soil loss respectively. Result Meki river watershed (2110.4 km2 of area) is dominantly covered by cultivated LUS (41.5%), EBLUS (10.65%), Bush and Chat LUS (25.6%), Forest and plantations LUS (14.14%), built-up (7.4%) and water bodies (0.75%). Soil loss is increasing from 1987 to 2017 and a larger part of the watershed suffers a moderately severe to very severe risk (18 t ha−1 year−1 to > 80 t ha−1 year−1) in all sub-watersheds irrespective of the land use systems which shows the watershed is facing sever degradation problem. The mean soil loss of 30.5 t ha−1 year−13 and 31.905 t ha−1 year−1 are verified from Enset growing zones and non-Enset growing zones of the watershed respectively. Conclusion EBLUS saves significant amount of soil despite the steepness of the slopes of the Enset growing zones of the watershed. Hence, expansion of EBLUS can contribute in sustaining water bodies, including Lake Ziway by reducing soil loss rate and sedimentation problem for the ecological sustainability of the watershed. Therefore, separate land use policy and awareness creation are mandatory for such EBLUS expansion, sustainable watershed management interventions and conservation of the natural environment in the watershed based on its suitability and severity of erosion risk mapping.


Author(s):  
Mehari Mariye ◽  
Melesse Mariyo ◽  
Yang Changming ◽  
Zebene Lakew Teffera ◽  
Brhane Weldegebrial

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