February 2023
·
20 Reads
The submerged dam is one of the commonly used schemes for the prevention and treatment of the pit-type collapse, which is often used in the pit-type collapse emergency treatment in Anhui and Jiangsu sections of the Yangtze River and has achieved good silt-promoting effects. However, the height of submerged dam lacks theoretical and experimental basis in the design and has been determined by experience in the past. Through the physical model of the pit-type collapse of Guizhou Village in the Yangzhong Reach, five different heights of the submerged dam were tested, and the flow velocity, flow direction and surface flow pattern of 12 points in the pond were measured. The test results show that the surface velocity of the inner surface of the submerged dam in the lower part of the pond increases due to the influence of the submerged dam, while the velocity of the bottom layer decreases, and the velocity of the inner side of the upper part mainly decreases; the average velocity in the pond decreases with the increase of the height of the submerged dam and there is a linear relationship between the two; considering that the engineering volume of the submerged dam has a square relationship with the height of the submerged dam, it is believed that the submerged dam should not be too high as long as it meet the sedimentation in the pond.
