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Article Dans Une Revue Étude et Gestion des Sols Année : 2007

Utilisation du modèle STREAM pour raisonner les aménagements fonciers

Résumé

In the Pays de Caux, runoff on crop fields is at the origin of important disturbances in frequency and costs, such as ephemeral gully erosion, muddy flows and turbidity of drinking water. As most of the slopes are gentle (< 3%), water circulation thus strongly depends on the shape, limits and tillage direction of fields. Since 1997, in the operations of land development, techniques are proposed and realized to limit erosive runoff. Within the framework of such an operation in progress in a catchment area of 501 ha, STREAM was used to locate areas where the runoff is likely to concentrate and thus to determine suitable sites for control measures. After obtaining input data, STREAM made it possible to compare the runoff patterns and volumes before and after land consolidation and that for several spring and winter rainfall events with return periods of from 2 to 20 years. Graphic results highlight modifications of the runoff network on the plateau, due to the changes of fields’ limits and size. Since land use remained unchanged, there is no significant difference in runoff volumes at the outlet of the catchment area. On the other hand, on the plateau, STREAM highlights important local modifications related for example to the removal of a meadow (50% more runoff). STREAM also made it possible to test the impact of the installation of two new ponds on runoff. Results show that the use of STREAM during an operation of land development can be useful, and they also make it possible to determine under which conditions it is a tool to aid engineering and design department decision making. It makes it possible to identify the assets of existing field pattern in order to preserve them in the project and test the new field pattern at the stage of the preliminary draft in order to estimate its impact on the runoff. The engineering and design department can then propose soil protection measures or modify the initial project.

Domaines

Science des sols
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Dates et versions

hal-01197666 , version 1 (11-09-2015)

Identifiants

  • HAL Id : hal-01197666 , version 1
  • PRODINRA : 14612

Citer

M. Lheriteau, Véronique Souchère, J.F. Ouvry, Alain Couturier, S. Lechêne. Utilisation du modèle STREAM pour raisonner les aménagements fonciers. Étude et Gestion des Sols, 2007, 14 (3), pp.179-194. ⟨hal-01197666⟩
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