摘要
根据北槽深水航道区域洪季多年固定测点的水文泥沙资料,综合利用Rouse公式及霍夫变换方法,估算了深水航道工程下洪季北槽悬沙沉降速度。从悬沙沉降速度角度探讨了北槽深水航道区域泥沙高回淤的基本原因。研究结果表明:航道回淤与悬沙沉降速度有十分密切的关系;洪季条件下,北槽悬沙沉降速度在2～8 mm/s之间,其悬沙沉降速度随盐度变化有先增大后变小的特点,在7‰左右时悬沙沉降速度最大;结合洪季北槽航道回淤分布,在深水航道CSW～CS3测点附近泥沙回淤量较高,该处航道高回淤是由于该区域具有较好的泥沙絮凝条件(盐度)及较高的水体含沙量致使该区域悬沙沉降速度较大造成的。
Based on the in-situ hydrological data of many years observed at the North Passage Deep-Water Channel of the Yangtze Estuary in the flood season, the settling velocity of suspended sediment is calculated by means of the Rouse equation and the Hough Trans- form. The basic reason for the high siltation region at the North Passage Deep-Water Channel is discussed from the viewpoint of the settling velocity. The results show that the channel siltation has a close relationship with the settling velocity of suspended sediment. In the flood season, the settling velocity ranges from 2 to 8 mm/s in the North Passage. With the increase of the salinity, the settling velocity of suspended sediment increases first and then decreases. When the salinity is about 7‰, the settling velocity reaches the maximum. Considering the recent siltation feature at the Deep-Water Channel of the Yangtze Estuary, the high siltation area is concentrated near CSW and CS3 in which a high sediment concentration with a good floeeulation condition makes the settling velocity of the suspended sediment larger.
出处
《海洋工程》
CSCD
北大核心
2013年第2期88-93,共6页
The Ocean Engineering
基金
上海市自然科学基金资助项目(11ZR1415800)
国家海洋局公益性资金资助项目(200905001-04)
关键词
悬沙沉降速度
霍夫变换
航道回淤
深水航道
北槽
settling velocity of suspended sediment
Hough transform
channel siltation
deep-water channel
North Passage
