Assessment and mapping of desertification sensitivity with MEDALUS model and GIS – Case study: basin of Hodna, Algeria

In Algeria, desertification risk is one of the main environmental and also social and economic problems. As much as 20 million hectares of northern Algeria are highly exposed and vulnerable to desertification with large areas falling into his ‘severe’ risk category, because the present massive destr...

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Main Authors: Boudjemline Fouzia, Semar Ahcene
Format: Article
Language:English
Published: Sciendo 2018-03-01
Series:Journal of Water and Land Development
Subjects:
Online Access:http://www.degruyter.com/view/j/jwld.2018.36.issue-1/jwld-2018-0002/jwld-2018-0002.xml?format=INT
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spelling doaj-ee68cd0a8c5c495182c84115210aea1d2020-11-25T00:20:51ZengSciendoJournal of Water and Land Development2083-45352018-03-01361172610.2478/jwld-2018-0002jwld-2018-0002Assessment and mapping of desertification sensitivity with MEDALUS model and GIS – Case study: basin of Hodna, AlgeriaBoudjemline Fouzia0Semar Ahcene1University of Sciences and Technology Houari Boumediene, Department of Geography and Spatial Planning, BP 32 El Alia, 16111 Bab Ezzouar, Algiers, AlgeriaNational Superior Agronomic School, Department of Soil Science, El Harrach, AlgeriaIn Algeria, desertification risk is one of the main environmental and also social and economic problems. As much as 20 million hectares of northern Algeria are highly exposed and vulnerable to desertification with large areas falling into his ‘severe’ risk category, because the present massive destruction of vegetation and soils. This study aimed to use geographic information system (GIS) for mapping environmentally sensitive areas to desertification based on Mediterranean Desertification and Land Use (MEDALUS) approach in basin of Hodna, Algeria. Sensitivity is estimated with a modification of the MEDALUS environmentally sensitive area index (ESAI) which identifies such areas on the basis of an index (ESAI) that incorporates data on environmental quality (climate, vegetation, soil) as well as anthropogenic factors. This methodology allows the classification of land in critical, fragile and potentially sensitive areas. The results obtained show that 61% of the area is classified potentially sensitive to low sensitivity. These areas are particularly located in mountain areas. Spatially, the areas sensitive to degradation are as well in the lower region of the Hodna in Highlands consisting mostly of steppe route. The factors that could explain these variations of sensitivity are related mainly to changes in precipitation between the North and the South altitude and pressure of the population and livestock.http://www.degruyter.com/view/j/jwld.2018.36.issue-1/jwld-2018-0002/jwld-2018-0002.xml?format=INTAlgeriadesertificationESAIHodna River basinMEDALUSsoil sensitivity
collection DOAJ
language English
format Article
sources DOAJ
author Boudjemline Fouzia
Semar Ahcene
spellingShingle Boudjemline Fouzia
Semar Ahcene
Assessment and mapping of desertification sensitivity with MEDALUS model and GIS – Case study: basin of Hodna, Algeria
Journal of Water and Land Development
Algeria
desertification
ESAI
Hodna River basin
MEDALUS
soil sensitivity
author_facet Boudjemline Fouzia
Semar Ahcene
author_sort Boudjemline Fouzia
title Assessment and mapping of desertification sensitivity with MEDALUS model and GIS – Case study: basin of Hodna, Algeria
title_short Assessment and mapping of desertification sensitivity with MEDALUS model and GIS – Case study: basin of Hodna, Algeria
title_full Assessment and mapping of desertification sensitivity with MEDALUS model and GIS – Case study: basin of Hodna, Algeria
title_fullStr Assessment and mapping of desertification sensitivity with MEDALUS model and GIS – Case study: basin of Hodna, Algeria
title_full_unstemmed Assessment and mapping of desertification sensitivity with MEDALUS model and GIS – Case study: basin of Hodna, Algeria
title_sort assessment and mapping of desertification sensitivity with medalus model and gis – case study: basin of hodna, algeria
publisher Sciendo
series Journal of Water and Land Development
issn 2083-4535
publishDate 2018-03-01
description In Algeria, desertification risk is one of the main environmental and also social and economic problems. As much as 20 million hectares of northern Algeria are highly exposed and vulnerable to desertification with large areas falling into his ‘severe’ risk category, because the present massive destruction of vegetation and soils. This study aimed to use geographic information system (GIS) for mapping environmentally sensitive areas to desertification based on Mediterranean Desertification and Land Use (MEDALUS) approach in basin of Hodna, Algeria. Sensitivity is estimated with a modification of the MEDALUS environmentally sensitive area index (ESAI) which identifies such areas on the basis of an index (ESAI) that incorporates data on environmental quality (climate, vegetation, soil) as well as anthropogenic factors. This methodology allows the classification of land in critical, fragile and potentially sensitive areas. The results obtained show that 61% of the area is classified potentially sensitive to low sensitivity. These areas are particularly located in mountain areas. Spatially, the areas sensitive to degradation are as well in the lower region of the Hodna in Highlands consisting mostly of steppe route. The factors that could explain these variations of sensitivity are related mainly to changes in precipitation between the North and the South altitude and pressure of the population and livestock.
topic Algeria
desertification
ESAI
Hodna River basin
MEDALUS
soil sensitivity
url http://www.degruyter.com/view/j/jwld.2018.36.issue-1/jwld-2018-0002/jwld-2018-0002.xml?format=INT
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