NDLI: Identification and assessment of the erosion risk on the K'sob watershed (eastern Algeria)

Content Provider	Springer Nature Link
Author	Benkadja, Rachid Boussag, Faissal Benkadja, Abdelhalim
Copyright Year	2014
Abstract	L’estimation des pertes de sols par érosion dans les régions semi-arides est souvent difficile en raison de l’interaction complexe de nombreux facteurs tels que le climat, la géologie, l’utilisation des terres, la topographie et les activités humaines. L’application des modèles de RUSLE, Gravilovic et ICONA permet d’évaluer les pertes du sol et d’identifier les zones dégradées du bassin versant du K’sob (1,482 km2), situé au nordest de l’Algérie, en vue de réaliser une gestion appropriée. Les résultats montrent que 90 % de la surface du bassin est soumise à un risque d’érosion faible à modéré et seulement 10 % est vulnérable à l’érosion avec une perte de sédiments estimée à 4.6 t ha−1 an−1. Les zones présentant des risques excessifs de ravinement et d’érosion en nappe couvriraient respectivement 10 et 1 % du bassin et les zones subissant les effets combinés de ces deux processus totaliseraient plus de 3 % du bassin. Finalement, les sites sujets à de potentiels glissements de terrains couvriraient un peu plus de 0.3 km2. Le réservoir du barrage K’sob est entouré de versants potentiellement dégradés par l’érosion en nappe et le ravinement. Toutefois, les plus grandes zones dégradées par ces processus sont situées près des zones urbaines de Rabta, Bordj Ghdir et K’sour. Les différences spatiales dans les taux d’érosion dans le bassin versant du K’sob sont principalement causées par des différences dans le type de couverture terrestre et dans la pente du gradient.Les modèles RUSLE, Gravilovic et ICONA fournissent des outils utiles pour caractériser l’érosion du sol et peuvent être utilisés pour la hiérarchisation des zones vulnérables sur les bassins versants semi-arides.The estimated of soil losses by erosion in semi-arid regions is often difficult due to the complex interaction of many factors such as climate, geology, land use, topography and human activities. RUSLE, Gravilovic and ICONA models are used to evaluate soil losses and characterize degraded areas in the K’sob watershed (1,482 km2), located north eastern Algeria, in order to implement management intervention. The results show that 90 % of the basin surface is subject to low to moderate risk erosion and only 10 % is vulnerable to erosion with sediment loss estimated at 4.6 t ha−1 year−1. Areas with excessive risk of gully and sheet erosion cover respectively 10 and 1 % of the basin and zones suffering the combined effects of these two processes would total more than 3 % of the basin. Finally, the sites subject to potential landslide cover just over 0.3 km2. The K’sob dam’s reservoir is surrounded by potentially sides degraded by sheet erosion and gully. However, larger areas degraded by these processes are located near urban areas as Rabta, Bordj Ghdir and K’sour. Spatial differences in erosion rates in the K’sob watershed are mainly caused by differences in the type of land cover and slope gradient. RUSLE, Gravilovic and ICONA models provide a useful tool for identifying soil erosion and can be successfully used for prioritization of vulnerable areas in semi-arid watersheds.
Starting Page	91
Ending Page	102
Page Count	12
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	74
Issue Number	1
e-ISSN	14359537
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-04-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soil losses RUSLE ICONA Gravilovic K’sob Semi-arid Geotechnical Engineering & Applied Earth Sciences Geoengineering, Foundations, Hydraulics Geoecology/Natural Processes Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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