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Abstract
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Article Information:
Design, Efficiency and Influence of a Multiple-Row, Mix-Species Shelterbelt on Wind Speed and Erosion Control in Arid Climate of North Sudan
M.D. Dafa-Alla and Nawal K.N. Al-Amin
Corresponding Author: Nawal Khidir Nasr Al-Amin
Submitted: 2011 May, 14
Accepted: 2011 June, 28
Published: 2011 November, 10 |
Abstract:
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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 wind's 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.
Key words: Design, dry land, impact, protection, sand deposition, shelterbelt,
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Cite this Reference:
M.D. Dafa-Alla and Nawal K.N. Al-Amin, . Design, Efficiency and Influence of a Multiple-Row, Mix-Species Shelterbelt on Wind Speed and Erosion Control in Arid Climate of North Sudan. Research Journal of Environmental and Earth Sciences, (6): 655-661.
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ISSN (Online): 2041-0492
ISSN (Print): 2041-0484 |
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