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guan yu gan han qu shui wen di zhi yan jiu guo wai qing kuang jie shao
Author(s): 
Pages: 60-61
Year: Issue:  4
Journal: Hydrogeology and Engineering Geology

Keyword:  地下水模型平均年降水量水资源开发地下水资源干旱区水文地质研究地表水水文学地区联合国;
Abstract: <正> 一、关于干旱区划分标准及水资源开发概况 不同国家和地区人们对划分“干旱”的标准极不一致。据1977年报导,联合国的粮农组织等机构曾以“干燥度”P/Etp作为划分干旱区的标准,式中P是平均年降水量;Etp是相应的可
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