Sediment Transfer Variation Approach at Large Rural Watersheds Scale of Northern France
François- Xavier Masson
Centre de Recherche et de Développement en Science du Sol, Economie, Environnement, Aménagement, 51, Rue de l’Alcazar, 59000 Lille, France
Henri- Bertrand Lefer
Centre de Recherche et de Développement en Science du Sol, Economie, Environnement, Aménagement, 51, Rue de l’Alcazar, 59000 Lille, France and Université du Littoral Côte d'Opale, EA 4477 – TVES –Territoires Villes Environnement et Sociétés, F-59000 Lille, France and Université Lille Nord de France, F-5900 Lille, France
Cherif Boulemia
Artois University, Laboratoire Génie Civil and Géo-Environnement (LGCgE-EA 4515), Technoparc Futura, F-62400 Béthune, France
Hassane Naji *
Université Lille Nord de France, F-5900 Lille, France and Artois University, Laboratoire Génie Civil and Géo-Environnement (LGCgE-EA 4515), Technoparc Futura, F-62400 Béthune, France
*Author to whom correspondence should be addressed.
Abstract
In the French “Nord-Pas-de-Calais” region, sediments suspended in runoff waters coming from rural watersheds play a major part in the turbidity of surface waters, silting up of streams, and silting of permanent structures such as canals and ports.
One of the main factors in processes limiting sediment transfers is the vegetation cover. Quantitative assessment and comparative analysis of the impacts of vegetation cover performed in various scales (fields, smaller watersheds, and larger watersheds) allow showing effects' analogy in these cases. As a result, it is possible to estimate and quantify, at little cost, the risks induced by erosion and runoff in the larger rural watersheds, and the need to change land use. Thereby, watersheds where the situation is more favorable can serve as a model.
Keywords: Rainfall, erosion, suspended matter, vegetal protection, sediment transfer, runoff