Aquatic Plants Reduce The Influence Of Storm And The Water Resuspension And Nutrient

By using self-designed spiral motor tank to study the effects of emergent plant-reed on storms reduction and sediment resuspension features. Under different hydrodynamic disturbance, we measured the wave height and water suspended solids concentration after different densities of aquatic action, so as to explore the impact of aquatic on the storm mitigation aspects as well as sediment resuspension. In order to study removal effects of the different aquatic plants on different nutrients in the water, we take five different approaches with planting Reeds,Lucky bamboo, Myriophyllum, Elodea and so on, then measured the changes of TN, TP, NH4+-N, DO and other important quality indicators in the water after different test cycle. The conclusions are as follows:1) Different densities of aquatic plants can effectively reduce the height of the waves caused by storm; Under the same wind conditions, the greater the density of aquatic plants, the more obvious the effect of wave dissipation. When the wind speed is close to or less than 8.7m / s and plant cultivation width is 4m or more, it can greatly reduce the wind waves. However, when the density is less than 25 plants / m2, wave dissipation effect is not obvious.2) The different planting densities of reed had a reduction effect on the SPM mass concentration of sediment resuspension due to wind and waves. There was a positive correlation between the different densities of reed and the SPM mass concentration, and the maximum reduction rate is up to 75.5%.3) Different aquatic plants can effectively absorb water nitrogen and phosphorus. For TN, the order of removal rate is Reed> Lucky Bamboo>Myriophyllum> Elodea> Ozone. For TP, removal order is Elodea> Reed>Lucky Bamboo> Myriophyllum> Ozone.