入湖河道生态修复工程对水流流速的影响研究

Effect of ecological engineering of the streams entering lake on flow velocity

在河流中开辟生化反应区、直接布设仿生填料净化河流微污染水体可以达到改善入湖水质、减少投资、降低能源消耗的目的。但在河道内直接布设填料势必会对河流的水动力条件及其河流原有的使用功能造成一定的影响。从填料给水流带来的阻力、流速及糙率变化等方面进行河道内直接布设生物填料对河流水动力条件的影响试验分析。结果表明,由于河道流速不大(属于缓流水体),9根/m2的填料布设密度对水流的扰动作用程度不高,填料段的糙率仅为无填料段糙率的1.08倍,不会对河道的泄水能力造成影响。

The biochemical reacting area is opened up and the bionic fillers are laid directly in the stream in order to purify the stream polluted water body entering a lake and reduce the investment and energy consumption. But this will influence certainly water power condition and its existing function. In this paper, the effect of the bionic fillers on the stream power condition is analyzed by the tests. The results indicate that the turbulent effect of the 9 stems/m^2 bionic fillers on water flow is low and the water flow gives priority to the laminar flow because of the low velocity in the tested stream. At the same time, the increasing rate of the roughness coefficient is low, too （the roughness coefficient of the reach with bionic fillers is only 1.08 times as much as the comparison reach）, which does not influence on the drainage of the stream.