Combating Desert Encroachment by Guiding People, Wind and Sand

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After the African droughts of the mid-sixties, the first sandhills appeared in the area south west of the Gezira. In the 1970s land had to be taken out of production because of sanded irrigation canals and invaded crop fields. The local authorities decided to follow a traditional defense method from Egypt and establish an irrigated Eucalyptus shelterbelt. The wind guided into and over the belt reduces around its edge and the sand can’t get carried any further. Over time, this sand accumulation could threaten such tree belts. Using desert vegetation that efficiently reduces wind speed close to the ground, this way settling sand, appears the best solution in a second front against desert encroachment. <br>　However, such human induced establishment of trees, shrubs and grasses over large areas appears extremely difficult due to water requirements. Quantitative agrometeorology of the protective shelterbelt led to design rules for such belts. Quantitative agrometeorology of wind flow and sand deposition around single trees and bushes, and composite grasses, led to selection of suitable species for use in combating sand encroachment. Keeping it under control is the price people have to pay for inhabiting marginal areas that start to become uninhabitable.

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  • 農業気象

    農業気象 60 (5), 349-352, 2005

    日本農業気象学会

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