Design, Efficiency and Influence of a Multiple-Row, Mix-Species Shelterbelt on Wind Speed and Erosion Control in Arid Climate of North Sudan

Author

By M.D. Dafa-Alla, Nawal K.N. Al-Amin.

Abstracts

The study aimed at assessing the design and efficiency of Alhudi shelterbelts in Semi arid zone of Northern Sudan in protecting soil erosion, suppressing moving sand and suggesting a suitable and appropriate shelterbelt design to be applicable in similar conditions at national and regional levels. Alhudi is an irrigated shelterbelt composed of six rows of tree species: Acacia seyal, Acacia ehrenbergiana, Ziziphus spina-christi, Azadirechta indica, Conicarpus lancifolius and Acacia amplicips. Based on shelterbelt configuration two well defined segments on the shelterbelt were recognized (termed belt 1 and belt 11). Wind speeds were measured on windward of both belts during north prevailing wind using CR800 programmable data logger connected to cup anemometer. Vertical measurements were taken at 0.25 and 0.5 h, horizontal measurements were taken at 0.25, 0.5, 1, and 2 h from the shelterbelt upwind and a control anemometer was placed in an open area for the two levels and distances. Ten-minute average wind speeds were recorded. The measurements were aimed to evaluate the influence of the shelters on capability of wind to erode the soil windward and create dust and sand storm or to reduce the coming winds load capability to deposit its load (sand deposit). The capability of each belt were estimated and predicted by applying a protection efficiency model. Results indicate that species of Acacia ehrenbergiana and Acacia seyal or other species of this family are not suitable for first row of the windward of a shelterbelt. The appropriate shelterbelt design to protect buildings and cultivated fields from sand storm in arid climate of Sudan is recommended to be irrigated, of at least three rows with its height increased from outside to inside, to decrease turbulence. Shelterbelt proper management is crucial for better growth and efficiency

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