水文下垫面分析是水文分析计算、水文测验、水文预报、水资源评价等的基础性工作。
Hydrologic underlying surface analysis are the basic study in hydrologic analysis, hydrologic observation, hydrologic forecast and water resources assessment.
在水文分析计算时，有时需要根据图形参数进行有关数据的计算，如用暴雨等值线图计算流域平均雨给出量的时候。
In hydrologic analysis, we calculated related data according to figure parameters, as using rainstorm isoline to reckon average rainfall in the river basin.
利用黄河口实测水文及潮汐资料分析计算了海向来沙情况。
The paper analyzes and calculates the sediment coming from the sea by utilizing the observed hydrological and tidal data of the Yellow River estuary.
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