Estimation brute de l'érosion
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Estimation brute de l'érosion

Estimation brute de l'érosion


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Une tentative a été faite pour modéliser la dégradation des sols en termes d'érosion hydrique d'un sous-bassin versant sélectionné (7710,64 ha) à l'aide du modèle RUSLE via l'interface ArcGIS. L'érosivité moyenne des précipitations annuelles sur 30 ans (1986-2015) a été estimée à 480,63 mt-ha./cm à l'aide d'une formule standard. Le facteur d'érodabilité a été calculé à 0,236 pour les sols limono-argileux et à 0,177 pour les sols argileux à l'aide d'une formule modifiée. Le rapport entre l'érosion en rigoles et l'érosion inter-rigoles a été dérivé de la carte des pentes à l'aide d'une formule standard. Le facteur de longueur de pente L a été dérivé à l'aide du modèle USPED (Unit Stream Power Erosion and Deposition). Les couches raster du facteur de pente pour les pentes 9 % ont été préparées séparément à l'aide de la couche raster de pente (en degrés) afin de former la carte finale du facteur de pente. Les valeurs standard du facteur de pratique de conservation pour les terres agricoles en pente transversale ont été utilisées pour préparer la carte du facteur P. Deux approches différentes ont été adoptées pour hiérarchiser les micro-bassins versants. La limite de tolérance à la perte de sol de la zone d'étude a été utilisée pour dériver la carte de sensibilité à l'érosion afin d'identifier la priorité des programmes de conservation. Les priorités des micro-bassins versants ont été déterminées comme suit: d, g, j k, e, f et h pour la planification du développement.


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Product Details
  • ISBN-13: 9786208895839
  • Publisher: Editions Notre Savoir
  • Publisher Imprint: Editions Notre Savoir
  • Height: 229 mm
  • No of Pages: 136
  • Returnable: N
  • Weight: 245 gr
  • ISBN-10: 6208895839
  • Publisher Date: 20 Jul 2025
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Spine Width: 8 mm
  • Width: 152 mm


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