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由于受气候的影响,地球上的降水在时间、空间分布上都有很大的差异。从空间分布来说,地球上在亚热带地区较赤道地区,内陆地区较沿海地区,降水量都要少得多,致使这些地区出现许多大沙漠;在湿润气流迎风坡的降水量比背风坡要大得多。因此,水资源的空间分布是极其不均的。人们为了改变水资源地区分布不均,把多水地区的水引向缺水地区,这就是跨区域调水。又因这多水区和缺水区一般都处在
Due to the influence of climate, precipitation on the earth has great difference in time and space distribution. In terms of spatial distribution, precipitation on the Earth is much lower in the subtropical regions than in the equatorial regions and inland regions, compared with the coastal areas, resulting in the emergence of many large deserts in these areas. Precipitation on the windward side of the humid air stream is greater than that on the leeward Much bigger. Therefore, the spatial distribution of water resources is extremely uneven. People in order to change the uneven distribution of water resources, water diversion areas to dry areas, which is trans-regional water transfer. Because of this water and dry areas are generally in place