水源枯竭(exhaustion of water source) 因自然或人为原因导致供水水源的出水量减少以至完全断水的现象。水源是为某种用水要求在较长期可提供一定数量和质量水量的源地,通过全球水文循环不断补给。地表水体如河流、淡水湖泊及人工水库以及浅层地下水含水层等都是常见的水源。深层地下水含水层也是很好的水源,但其补给量与当年降水联系较弱,应避免长期大量采用。
大面积的农田损失年复一年,这主要是由于土壤侵蚀,水源枯竭和城市化进程。
Large areas of croplands are lost year after year, due mainly to soil erosion, water depletion and urbanization.
随着生态系统发生变化,沙漠面积不断扩大,粮食生产日渐减少,水源枯竭,人口也不得不迁移,搬到更适宜居住的地区。
As ecosystems change and deserts expand, food production diminishes, water sources dry up and populations are pressured to move to more hospitable areas.
曾经给这些井提供水源的蓄水层已被宣告枯竭。
The aquifer which had once fed the wells was pronounced dry.
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