Experimental Study On The Effection Of Dock Project On The Flow In Mountainous Rivers

The flow characteristics can be changed after the built of dock project, which may cause disadvantage effects on navigation, flood control and river regime. If the type and arrangement of dock is unreasonable, big disaster maybe occurred. In this paper, the flow characteristics near the dock is studied, which can be referred to the field dock project.In this paper, the methods of generalized flume experiment and theoretical analysis are applied. 37 groups experimentation for the purpose of studying the effect of dock on water level and 24 groups experimentation of studying the effect of dock on flow velocity are analyzed. Based the results of experimentations, the maximum height and limit of damming of water level and its affected factors are discussed, and the situation of flow velocity around the dock is also studied.The conclusions of this paper can be summarized:1. The relative maximum height of damming of water level near the dock is mainly related with the area of damming of dock,the Froude number and the styles of dock structure. The formula 4.15 of the relative maximum height of damming of water level is gained based on the experimental data. To the relative maximum height of pile cluster, if the piles number exceeds 2, the piles number is less effect on the relative maximum height of damming.2. Under the condition of lower height of maximum damming of water level, the formulation 4.9 can be used to evaluate the damming limit.3. The maximum increment of velocity and influence domain of dock has the relation of direct ratio with the damming area and velocity.4. The velocity of flow in the area upper to dock and behind of dock will be decreased and the velocity in the rest area will be increased.The maximum increment of velocity caused by dock is distributed in the region from the front of dock to the central line of the downstream reach.