水文要素 (hydrological elements) 构成某一地点或区域在某一时间的水文情势的主要因素。水文要素是描述水文情势的主要物理量，包括各种水文变量和水文现象。
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The change of the hydrological elements in the Haihe River basin is influenced by human activities and climate change.
海河流域水文要素的变化受气候变化和人类活动的共同影响。
参考来源 - 海河流域近50年水文要素变化分析·2,447,543篇论文数据，部分数据来源于NoteExpress
The paper introduces the structure, the every hydrological elements and the calculation method of four waters transformation model for Second songhuajiang river mainstream.
文中叙述了四水转化模型的结构及制作，并详细介绍了模型中各项水文要素及计算方法。
The paper forecasts the drought year of Liuhe river water system by the grey theory, and expatiates the basic method to forecast the stochastic hydrological elements by the theory.
文章通过利用灰色理论预测柳河水系的干旱年，阐述了灰色理论预测随机水文要素的基本方法。
This paper deals with the distributive characteristics of COD in Beihai Bay, and its relationship with hydrological and biological elements, states of nitrate and phosphate.
本文探讨了北海湾COD值的分布特征及其与水文、生物要素及不同形态氮、磷含量的关系。
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