指河流、湖泊、水库等自然水体各水文要素随时间、空间的变化情况。其中水文要素包括了降水、径流、蒸发、输沙、水位、水质等要素。
根据芦苇植被分布范围与水文情势的关系，提出了湿地水文管理建议。
According to the relation between the vegetation and hydrological situation, the suggestion of wetland hydrological management is proposed.
但防洪工程建设项目实施后，将给长江河道演变、江湖关系、水文情势等带来一系列的变化。
But the flood control projects will bring about a series of changes to the river channel evolution of the Yangtze, the river lake relation and hydrologic regime etc.
根据近年来东江下游及三角洲河道水文情势的变化，分析东江下游及三角洲河段供水水源保证工程建设的必要性。
According to variation of the hydrologic state, the paper mainly analyses the necessity of the source ensuring project of Dongjiang river and its delta waterway.
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