【摘要】 扬子浅滩位于长江口以东,水深40 m左右,普遍发育中小水下沙丘并处于运动状态。按32片沙波参数统计,迁移方向在90°~180°之间,其中150°~180°者占30%,120°~150°者占69%;使用Rubin和改进的Hardisty公式计算,以潮流作用为主的常态海况下,沙波迁移率为19.70 m/a,以浪流为主的暴风浪期间,约为12.72 m/a,一年总迁移率约为32.4 m/a,与世界上若干海底沙波定位观测数据相对比,这一迁移率应属于缓慢—中等的量级。更多还原

【Abstract】 The Yangtze shoal,located in the east of the Yangtze River Estuary and about 40 m deep below sea level,has widely spread small-medium subaqueous dunes,whose wave height is 0.6 m and which are generally in activity.Statistical result of 32 subaqueous dune areas shows that the movement direction is within 90°～180°.150°～180° direction accounts for 30% and 120°～150° for 69%.The movement velocity of the small-medium subaqueous dunes,calculated using the formulas from Rubin and Hardisty,is usually 19.70 m/a and controlled by tidal currents,and is 12.7 m/a in storm season.And the total migration rate is 32.4 m/a.Compared with observation data from other small-medium subaqueous dunes in the world,the activity of small-medium subaqueous dunes in the Yangtze shoal belongs to a slow-medium magnitude.更多还原