暴雨的历时、面积和深度的关系(时、面、深)是水文气象学的重要研究课题之一。
The relationship among the duration the area and the depth of the hard rain is a important research subject in hydrometeorology.
后者设立了水文气象学委员会，到1971年演变为今天的水文学委员会。
The latter established the Commission for Hydrological Meteorology, which by 1971 had evolved into the present CHy.
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