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水资源所具有的时空特征表明水资源的自然分布不仅存在空间（地区、流域）上的差异而且在时间（年度、季节）上也不相同。我国由于降水量在时空上的严重不均衡性 ,更突出了水资源的时空差异特性。储水的重要性在干旱半干旱地区尤显突出 ;加上每年有汛期与否之分 ,并且存在丰水?
Spatiotemporal characteristics of water resources show that the natural distribution of water resources is not only different in space (regions, watersheds) but also different in time (year, season). Due to the serious imbalance of precipitation in time and space in our country, the spatiotemporal variation of water resources is more prominent. The importance of water storage is particularly prominent in arid and semi-arid areas; together with the annual flood season or not, and there is abundant water?