河流断面指的是垂直地面剖切的河流的切断面。可分为河流横断面和河流纵断面。前者是指与河流流向垂直的断面，后者是指与河流流向平行的断面。了解河流的横断面，掌握地形变化情况对进行水文观测、寻找适宜的航道十分重要，了解和研究河流的纵断面对剖析河流的水文特性和编制航运发展计划均有一定价值。
在枯水期调查了G市六个河流断面的有机污染状况。
The status of organic pollution of six river segments was investigated during dry season.
该模型应用于某河流断面的水质综合评价，得到比较合理的结果。
The model has been applied to water comprehensive assessment of a certain river and reasonable conclusion was drawn.
所有单一河流断面处的含沙量通过单一河流悬沙输运的求解方法获得。
A numerical model for simulating unsteady flow and suspended sediment transport in river networks was presented.
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