【摘要】：根據(jù)椒江口外海域4個(gè)站位的懸沙濃度垂線分布資料,用Rouse公式估算了椒江口外海域的懸沙沉降速度。結(jié)果表明:(1)椒江口外海域的懸沙沉降速率范圍在0.551~5.37 mm/s,全水域的平均懸沙沉速為2.63 mm/s,大潮平均懸沙沉速為2.65 mm/s,小潮平均懸沙沉速為2.60 mm/s;(2)平均懸沙沉速由大到小的空間分布規(guī)律為S1、S2、S3、S4站位,即河口主槽區(qū)(S1、S2)的懸沙沉降速度最大,其次是河口淺灘區(qū)(S3),最后是口外近海區(qū)(S4);(3)河口主槽區(qū)(S1、S2)大潮時(shí)的沉速小于小潮,而河口淺灘區(qū)(S3)和近海區(qū)(S4)大潮時(shí)的沉速大于小潮,這可能是不同位置受河流流速及潮汐力的影響不同而造成的;(4)平均懸沙沉降速度往往在漲/落憩之后的1~2 h不斷增大,其后沉速逐漸減小。
[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.
【作者單位】： 浙江大學(xué)地球科學(xué)系;臺(tái)州市港航管理局;浙江大學(xué)港口海岸與近海工程研究所;
【分類號(hào)】：P736.21

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本文編號(hào)：2429924