Study On The Experiment Of The Turbid-water Ski-jump Energy Dissipation

The ski-jump energy dissipation is a method of energy dissipation, which is very commonly used in energy dissipators. The river flow with a certain sand whose water structure and physical properties will be changed, which have an effect on flow movement and sand movement. When sediment concentration exceeds a certain number, rheological characteristic will also be changed, especially in sediment-laden river, whether turbid-water follows clear-water scouring disciplinarian or not is an urgent problem .Therefore, the study on experiment of turbid-water will be provided with practical meaning and theoretical value.To solve turbid-water dissipation in mountain river, The factors on influence to scour depth in energy dissipation were analyzed in this paper under the circumstance of pebble river bed and bed load in turbid -water. In the reference extremely scarce conditions, We investigated a lot of datas about scour on the bed rocky energy dissipation at home and abroad, analyzing systematically them. Referenced the result of energy dissipation on rocky river bed ,the pebble river bed was regarded as extreme broken rock to study .According to many model experiments, the paper analyzed the relations between scour depth in turbid-water and discharge per unit width,sediment concentration,sand fraction and the impact of tailwater depth and sediment discharge on scour pit depth in details, discussed the variation relationships between the ratio of turbid-water to clear-water and Froude numbers, selected a suitable formula of turbid jet-trajectory distance. Through observation and measure scour scale, main impacts were analyzed and scour hole feature was described and the calculation formula of turbid jumping pit depth was put forward as well combined with dimensional analysis and model experimental datas. The experimental results show that calculating result is similar to observation result, so, it can be used for reference.