Y形整治建筑物护滩效果分析

近年来,在航道整治工程中采用了一种外形类似"Y"的整治建筑物,取得了较好的护滩效果。选取长江下游典型潮汐分汊河段——白茆沙河段进行地形概化,采用潮流数学模型研究Y形建筑物的护滩效果。结果表明,护滩堤一般就近布置在需守护的滩体前沿等深线附近,护滩堤长度需覆盖滩体迎流面最宽处,护滩堤高程可取潮汐分汊河段特征水位;头部潜堤一般沿滩脊线布置,长度延伸至需守护的低滩,可根据多年历史地形资料选择在滩体稳定的等深线附近,高程则以可满足整治建筑物结构安全即可。

Beach protection with Y-shaped regulating structure

In recent years,a Y-shaped regulating structure has been applied in the waterway regulation project,which achieved good protecting beach effect.Based on the typical tidal branch channels of Baimao Sandbank segment in the lower Yangtze River,a mathematical model is established to study beach protection with Y-shaped regulating structure.The results show that the beach protection dike is generally placed near the edge of the protected beach,the length of the beach protection dike should cover the stoss side of the beach,and the elevation of the beach protection dike could be equal to the characteristic water level of tidal branching stream.The head submerged dike is generally placed along the ridge line,the length of the head submerged dike could extend to the protected low beach,which can be determined by choosing a stable contour line in the low beach based on years of historical terrain data,and the elevation of the head submerged dike will be able to satisfy the structural safety of buildings.