开敞水域斜跨挖槽内的流速折减规律研究

Study on the Regularity of the Velocity Discount of Trench at Oblique Angle in Open Water

本文根据水槽试验,并通过连云港外海航道模型试验及国外资料验证,求得在海区、河口开挖航槽后在潮汐、椭圆流作用下,水流跨过挖槽后引起的流速、流向的变化规律,提出了挖槽轴线、上边坡等处垂线平均流速公式,表明了槽内流速的折减与挖槽深度、来流交角和挖槽边坡等主要因素的关系。由此,可指导挖槽定线,并根据流速折减值预测挖槽的泥沙回淤强度,判断挖槽的稳定性。

Based on the physical model tests and theoretical analysis, and verified through experiment of offshore channel in Lian Yun Gang Port and foreign information, the paper sumarized the variation regularity of velocity and direction of the flow across the dredged channel under the influence of tide and oval flow in sea area and estuary, gave the experimental formulas of depth-averaged velocity on the trench axis and the front side-slope, and also the relations of the velocity with the main factors (depth of trench, angle of incidence, side-slope) are revealed. Therefore, the study of this experiment serves as aligning the trench axis and forecasting the intensity of the sedimentation as well as to judge the stability of the trench.