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标题：Modelling of runoff and sediment transport of the Jannet (Maktar, Tunisia) watershed
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作者：Lilia Ben Cheikha ; Moncef Gueddari ; Mustapha Saadaoui 等
期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：2008
卷号：19
期号：3
页码：155-162
DOI：10.1684/sec.2008.0135
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Lilia Ben Cheikha , Moncef Gueddari , Mustapha Saadaoui Faculté des sciences de Tunis, Unité de recherche (UR) Géochimie et géologie de l’environnement, Campus universitaire, 1060 Tunis, Tunisie, Direction Générale des Ressources en Eaux (DGRE), Rue de la Manoubia, Montfleury, Tunis, Tunisie Key words: modelling, runoff, Sahara, sediment, water flow, watershed, water stress DOI : 10.1684/sec.2008.0135 Page(s) : 155-62 Published in: 2008 In this research we studied the modeling of the flow of surface and solid transport on the level of the Jannet area catchment. This study aims at specifying the factors which intervene in the phenomenon of the hydrous erosion and at establishing the space-time evolution of the effects of these factors on the impoverishment of the soil by using the KINEROS2 model (1) which describes the processes of interception, infiltration, streaming and erosion on the scale of the rainy event. The Jannet area catchment, with a surface of 541 hectares subjected to a semi-arid climate, is characterized by a very broken relief and ground composed of argilo-marly facies which make it sensitive to erosion. Modeling by model KINEROS2 required a subdivision into 20 under-basins and 7 channels, which was carried out along the principal thalweg of the basin. The study of the hydrological mode of the basin made it possible to conclude that the risings which have occurred, following intense and homogeneous pluviometric events on the basin, are characterized by strong flows for the autumnal season (event of the 24/09/1998, R (USA) = 45). The The annual average of the indices of aggressiveness of the rains observed on the basin during period 1994/1995-2002/2003 is of the order: R (USA) = 62. The calibration of component solid transport is carried out with an error which does not exceed 13%. Using the KINEROS2 model made it possible to calculate erosion specific to the level of each under-basin. One can thus locate zones with strong erosion, which arise mainly in the upstream part of the basin characterized by strong slopes which exceed 30%.
关键词：modelling; runoff; Sahara; sediment; water flow; watershed; water stress