胶州湾大沽河河口近岸海域短时间尺度沉积动力过程

2012年9月24日-10月4日,在胶州湾大沽河河口近岸水域进行了长达10天的原位监测,并获得了波浪、潮流、水位、海床变化、水体浊度等同步监测数据。同时,在本次观测期间捕捉到了一次强的西北向离岸风天气过程。分析结果表明:在东南向岸风的天气条件下,大沽河河口海域海床地形呈冲淤交替的变化规律;但当风向转为强劲的离岸风时,波浪向岸传播受到抑制,波高和波能迅速减小,海床则表现为短时间的快速淤积。此外,以胶州湾大桥为界,大桥北部表层沉积物呈向西运移趋势,大桥南部沉积物呈向东运移趋势。

SHORT TERM DEPOSITIONAL DYNAMIC PROCESSES AT DAGU RIVER MOUTH OF JIAOZHOU BAY

A platform with autonomous instruments was established for 10 days to monitor synchronous waves, currents, water level, seabed changes and water turbidity at the Dagu river mouth of the Jiaozhou Bay during the period from September 24 to October, 2012. Moreover, a northwest offshore strong winds process was caught successfully during the period. The results suggest that the seabed was under an alternative erosion-deposition pattern during the period landward winds dominate, but under rapid deposition when it met with offshore strong winds from northwest, since wave propagation toward the shore is limited and wave height and wave energy decrease in a sudden. In addition, The Jiaozhou Bay Bridge renders some impact to the sediment movement. The surface sediment of seabed to the north of the bridge shows a westward transporting tendency, whereas surface sediment of seabed shows an eastward transporting tendency to the south of the bridge.