The sea level stops in a high position for a long time, so both drop of water and currentvelocity are small.
并且由于海平面高度相对稳定在较高位置，河流纵比降较小，流速也较小。
2
The movement and diffusion process of pollutants in current of water are affected by water temperature, local flow velocity and direction, stream shape, and so on.
由于污染物在水流中的扩散迁移过程受水温、局部流速与流向、河道形状等因素的影响。
3
Especially they improved the thickness of curved way water tongue and the uniformity of currentvelocity which distribute in a cross section, promise the stability and the safety of the end jet flow.