On shelterbelt design for combating sand invasion

Mohammed, A.E.; Stigter, C.J.; Adam, H. S.

doi:10.1016/0167-8809(96)01026-2

Cited by 30 publications

(20 citation statements)

References 6 publications

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“…At belt II wind erosion took place at 0.5 h and 1 h closer to the belt at level 0.5 h. This supports the observation of Mohammed et al (1996) of the occurrence of negative sand deposition (erosion) at a certain distance from the belt. They attribute that to the magnitude of the approaching wind speed and its power to induce saltating sand.…”

Section: Delineation Of Zones Of Sand Depositionsupporting

confidence: 86%

“…Their range extend from 19-24 and 22-28, at level 0.25 h and 12-21 and 13-30 at level 0.5 h for belt I and II, respectively. Comparable results are made by (Mohammed et al 1996) that an average wind reduction of around 20% at 50 cm height occurred between 1.5-3 h. Higher open wind speeds at belt I at the three distances for the two levels ( Fig. 1 and 2) resulted in smaller protected zone.…”

Section: Discussionmentioning

confidence: 67%

“…Determination of the shelter effect by direct measurement of sand movement around fences has rarely been done (Dong et al 2006). In arid regions, few studies have detailed the effectiveness of vegetation in controlling wind erosion (Mohammed et al 1996).…”

Section: Introductionmentioning

confidence: 99%

“…What is more, previous studies paid little attention to the shelter effect created upwind of the fence (Dong et al 2006). For the capturing of sand it is the wind behaviour at the windward side that is of importance (Mohammed et al 1996). In Sudan Mohammed (1991); Al-amin (1999); Dafa-Alla and Al-amin (2011); conducted field measurements to assess windbreak efficiency on reduction of wind speed and sand deposition.…”

Section: Introductionmentioning

confidence: 99%

“…In Sudan Mohammed (1991); Al-amin (1999); Dafa-Alla and Al-amin (2011); conducted field measurements to assess windbreak efficiency on reduction of wind speed and sand deposition. Mohammed et al (1996) develop a conceptual model of net sand deposition around the edge of a shelterbelt (windward and inside) and suggest a design of tree shelterbelts for protection against moving sand of a multi-row, long, wide, tall shelterbelt of low permeability, and with a canopy geometry appropriate for sand protection, without gaps, while its direction should be perpendicular to the prevailing wind. The novelty of this study is attributed to its empirical field measurement of wind speed and assessment of erosion and its focus on the windward side of a windbreak grown in arid zone to protect industrial buildings from wind damage and sand invasion.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Optical Porosity of Tree Windbreaks on Windward Wind Speed, Erosive Force and Sand Deposition

Dafa-Alla¹,

Al-amin²

2016

Journal of Forest and Environmental Science

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The research was conducted windward of an irrigated Acacia amplicips Maslin windbreak established to protect As Salam Cement Plant from winds and moving sands. Two belts with approximate optical porosities of 50% and 20% were studied in River Nile State, Sudan. The research aimed at assessing the efficiency of the two belts in wind speed reduction and sand deposition. Research methods included: (i) estimation of optical porosity, (ii) measurements of windward wind speeds at a control and at distances of 0.5 h (h stands for windbreak height), 1 h and 2 h at two vertical levels of 0.25 h and 0.5 h, (iii) estimation of relative wind speeds at the three positions (distance and height) at windward and (iv) estimation of wind erosive forces and prediction of zones of sand deposition. Results show that while the two belts reduced windward wind speeds at the two levels for the three distances, belt II was more effective. Nearest sand deposition occurred at 2 h and 1h windward of belt II and belt I, respectively, at level 0.25 h. At level 0.5 h, sand was deposited only at 2 h windward of belt II and no sand deposition occurred windward of belt I. The study concludes that less porous windbreaks are more effective in reducing wind speed and in depositing sand in windward direction at a distance of not less than twice the belt height.

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Section: Delineation Of Zones Of Sand Depositionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 67%