Desert irrigation. Infrared satellite image of circular,irrigated fields (at centre) in the desert. In the infrared range,healthy vegetation shows up red. Each of these irrigation circles are watered by a revolving boom which trickles water onto the ground. This is a much more efficient way of using water than spraying jets of water from a central point. Many deserts have underground reservoirs of water (aquifiers) beneath them. Many of these aquifiers are becoming polluted or drained because of over-exploitation. Image of the Sahara desert at Al Kufrah,Libya,taken by the American Landsat satellite in February | |
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Credit: | Science Photo Library / MDA Information Systems |
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