椒江口外海域的悬沙沉降速度近似估算

发布时间：2019-02-24 20:56

【摘要】：根据椒江口外海域4个站位的悬沙浓度垂线分布资料,用Rouse公式估算了椒江口外海域的悬沙沉降速度。结果表明:(1)椒江口外海域的悬沙沉降速率范围在0.551~5.37 mm/s,全水域的平均悬沙沉速为2.63 mm/s,大潮平均悬沙沉速为2.65 mm/s,小潮平均悬沙沉速为2.60 mm/s;(2)平均悬沙沉速由大到小的空间分布规律为S1、S2、S3、S4站位,即河口主槽区(S1、S2)的悬沙沉降速度最大,其次是河口浅滩区(S3),最后是口外近海区(S4);(3)河口主槽区(S1、S2)大潮时的沉速小于小潮,而河口浅滩区(S3)和近海区(S4)大潮时的沉速大于小潮,这可能是不同位置受河流流速及潮汐力的影响不同而造成的;(4)平均悬沙沉降速度往往在涨/落憩之后的1~2 h不断增大,其后沉速逐渐减小。
[Abstract]:Based on the vertical distribution data of suspended sediment concentration at four stations outside the mouth of Jiaojiang River, the settling velocity of suspended sediment in the sea area outside Jiaojiang Estuary is estimated by Rouse formula. The results show that: (1) the sedimentation rate of suspended sediment in the sea off Jiaojiang River Estuary is in the range of 0.551 ~ 5.37 mm/s,. The average settling velocity of suspended sediment is 2.63 mm/s, and the average velocity of suspended sediment is 2.65 mm/s,. The average suspended sediment sedimentation rate of the low tide is 2.60 mm/s;. (2) the spatial distribution law of the average suspended sediment settling velocity from large to small is that the sedimentation velocity of suspended sediment is the largest in the main channel area of the estuary (S _ 1 / S _ 2), followed by the estuarine shoal area (S _ 3), and finally the offshore area (S _ 4) outside the mouth; (3) the settling velocity of the main channel area (S _ 1 / S _ 2) is lower than that of the low tide, while that of the estuarine shoal area (S _ 3) and the offshore area (S _ 4) is higher than that of the low tide. This may be caused by different positions affected by river velocity and tidal forces. (4) the average settling velocity of suspended sediment increases at 1 / 2 h after rising / falling, and then decreases gradually.
【作者单位】：浙江大学地球科学系;台州市港航管理局;浙江大学港口海岸与近海工程研究所;
【分类号】：P736.21

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