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。
Based on the hydrological data of over 20 years the relations between EL-NINO and some hydrological and meteorological elements off Zhejiang are analysed, which results in five conclusions.
本文根据浙江北部近岸20多年水文气象资料，初步分析了厄尔·尼诺现象与该地区几项水文气象要素之间的关系，得出五点结论。
In the paper, the hydrological underlying surface is defined, the elements composing the hydrological underlying surface and their action on water yield and concentration are analyzed.
提出了水文下垫面的定义，分析了组成水文下垫面各要素的基本性质及其在产、汇流方面的作用。
The rock types, climate patterns, lake basin and hydrological conditions in this region are contributory to the enrichment of trace elements in salt lake waters.
区域出露的岩性、气候、湖盆及水文等为盐湖水中富集痕量金属创造了有利条件。
Water balance elements of urban hydrological cycle have been measured and investigated, then checked by means of water balance equation in urban areas.
通过精测与调查收集城市水资源要素，并用城市水平衡方法检验。
Water balance elements of urban hydrological cycle have been measured and investigated, then checked by means of water balance equation in urban areas.
通过精测与调查收集城市水资源要素，并用城市水平衡方法检验。
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