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Accueil du site → Doctorat → Allemagne → 2001 → Erkundung strategischer Konzepte des Erosionsschutzes und der Sedimentrückhaltung bei großen Speichern in semi-ariden Gebieten Algeriens

Karlsruhe Universität (2001)

Erkundung strategischer Konzepte des Erosionsschutzes und der Sedimentrückhaltung bei großen Speichern in semi-ariden Gebieten Algeriens

Honermann, Helmut

Titre : Erkundung strategischer Konzepte des Erosionsschutzes und der Sedimentrückhaltung bei großen Speichern in semi-ariden Gebieten Algeriens

Auteur : Honermann, Helmut

Université de soutenance : Karlsruhe, Univ., Diss.,

Grade : Doktor-Ingenieurs 2001

Présentation
Subject of this dissertation is the development of a methodology to be used in regional planning for the exploration of strategies to protect large reservoirs in cultivated water catchment areas from erosion and to restrain them from sediments. This methodology is based on economic knowledge and applies to areas of marl and semi-arid climate with a mixed form of land use such as grain cultivation and animal husbandry. The water catchment area of the Es Saada dam in Algeria is used as a practical example Like in other Maghreb countries, one of the main reasons for the construction of large reservoirs in Algeria is the fact that the social and economic development is extremely limited by the available amount of water. The increased need of water is caused by the high average population growth of approx. 3,1 % per year during the last 30 years. With a chain of reservoirs, practically the entire Tell Atlas is used as a water catchment area. Therefore, for the northern part of Algeria, this concept of concentrated use of water has become a measure which more or less covers the whole area. Many of these reservoirs are subject to an increasing “sedimentation”. The high sediment transport is the consequence of the line erosion in marls. The loss of storage capacity reduces the profitability of the dam project and, therefore, at long-term, endangers the political target as well as the ecological, economic and social balance. Locations of big dams represent an important possession, as their number is limited and can not be multiplied. In many situations, the measures taken in Algeria until now with regard to erosion protection and sediment restraint have been unbalanced and inappropriate from the technical as well as from the socio-economic point of view. In many cases the attempt has been made to adapt techniques from other countries without verifying the physical and social conditions and without integrating the regional planning concepts. Previous efforts to register soil erosion have mainly been based on estimates considering physical influence factors. However, with regard to regional planning, influence factors which increase or reduce the soil erosion processes are of great importance. As mentioned, the active and influential factors of soil erosion processes are of socio-economic, political and cultural nature. The empiric investigations show that soil erosion processes are indirectly determined by locally overlapping socioeconomic changes which can lead to a negatively oriented change of land use. Due to the changed form of utilization, even a reduced population density in rural areas can have negative ecological consequences

Mots clés : Algerien ; Semiarides Gebiet ; Erosionsschutz ; Stausee ; Raumordnung ; Strategische Planung

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Page publiée le 27 mars 2007, mise à jour le 13 mai 2019