Soil roughness and overland flow

Abstract –Soil surface roughness affects surface depression storage, water infiltration, overland flow velocity as wellas overland flow organisation. This paper attempts to give an overview of our knowledge of the effects of roughness onsurface runoff and to indicate areas where further research is most needed. The relationship between soil surface rough-ness and depression storage is relatively well understood. On the other hand, few studies exist on the relationshipbetween roughness and the infiltration characteristics of a tilled surface, although this may be more important. Insights,which have been developed over the past few years, may in the near future lead to a better prediction of the hydraulicresistance of interrill and concentrated overland flow. Recent studies have also provided important information on theeffects of roughness on runoff patterns. soil roughness / depression storage / infiltration / hydraulic resistance / runoff pattern Resume – Rugosite du sol et ecoulement sur le terrain. La rugosite de la surface du sol affecte le stockage de l’eaudans les depressions de la surface, son infiltration et la vitesse ainsi que l’organisation de l’ecoulement sur le terrain.Cet article tente de donner une vue d’ensemble de nos connaissances actuelles sur les effets de la rugosite sur le ruissel-lement de surface et indique les domaines dans lesquels de nouvelles recherches sont les plus necessaires. La relationentre la rugosite de la surface et le stockage de l’eau dans les depressions est relativement bien connue. En revanche, ilexiste peu d’etudes sur la relation entre la rugosite d’une surface labouree et ses caracteristiques d’infiltration, bien quece phenomene soit plus important. Les tentatives d’approche developpees au cours des dernieres annees devraientconduire, dans un proche avenir, a une meilleure prediction de la resistance hydraulique des zones de ruissellement dif-fus et concentre. Des etudes recentes ont fourni egalement des informations importantes sur les effets de la rugosite surl’organisation spatiale de ruissellement.Rugosite du sol / stockage dans les depressions / infiltration / resistance hydraulique / organisation spatiale deruissellementAgronomie 20 (2000) 131–146

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