The observations of seabed sediment erosion and resuspension processes in the Jiaozhou Bay in China

LIU Xiaolei; ZHU Chaoqi; ZHENG Jiewen; GUO Lei; YIN Ping; JIA Yonggang

doi:10.1007/s13131-016-1072-5

基于原位观测的胶州湾沉积物侵蚀再悬浮过程研究

doi: 10.1007/s13131-016-1072-5

1.
中国海洋大学山东省海洋环境地质工程重点实验室, 青岛, 266100;海洋国家实验室海洋地质过程与环境功能实验室, 青岛, 266061
2.
中国海洋大学山东省海洋环境地质工程重点实验室, 青岛, 266100;中国地质调查局青岛海洋地质研究所, 青岛, 266100
3.
海洋国家实验室海洋地质过程与环境功能实验室, 青岛, 266061
4.
Qingdao Institute of Marine Geology, Chinese Geology Science, Qingdao 266071, China

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- 收稿日期: 2016-04-09
- 修回日期: 2017-01-04

The observations of seabed sediment erosion and resuspension processes in the Jiaozhou Bay in China

1.
Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China;Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
2.
Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao 266100, China;Key Laboratory of Marine Environmental and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China
3.
Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
4.
Qingdao Institute of Marine Geology, Chinese Geology Science, Qingdao 266071, China

摘要

摘要: 海洋动力作用下，河口海岸地区海床通常处于动态变化之中。作为地质环境的控制因素，海床沉积物侵蚀再悬浮过程的研究具有重要意义。为阐明胶州湾海域水动力条件对海床侵蚀再悬浮的作用，本文利用海底原位观测三脚架进行了现场观测。观测结果显示：通常条件下，潮流导致的最大海床剪应力可达0.35 N/m²，高于波浪引起的剪应力。涨潮期间，海床发生侵蚀；退潮期间，海床发生淤积。风速达到5 m/s时，波浪引起的剪应力近似等于流致剪应力。风速达到7 m/s时，有效波高为26 cm，波浪对海床侵蚀再悬浮过程起主要作用；此时也会导致海水浊度显著上升，高于通常条件下的2-8倍。分析表明：通常条件下，周期性海流影响海床侵蚀再悬浮过程；而大幅度沉积物再悬浮过程由偶发的波浪事件控制。针对胶州湾沉积物动力学机制的深入研究仍待进一步开展。
- 海床沉积物 /
- 侵蚀 /
- 再悬浮 /
- 三脚架 /
- 胶州湾
Abstract: In estuarine and coastal areas, the seabed is in a constant process of dynamic change under marine conditions. Seabed sediment erosion and resuspension are important processes that safely control the geological environment. Field tripod observations conducted in the Jiaozhou Bay in China are reported, to investigate the effects of hydrodynamic conditions on the erosion and resuspension processes of the seabed. The observational results show that the maximum shear stress created by tidal currents can reach 0.35 N/m², which is higher than the wave-induced shear stress during fair weather conditions. A seabed erosion frequently occurs during the flood tide, whereas a seabed deposition occurs during ebb tide. Waves can produce a bottom shear stress approximately equivalent to that induced by currents when the local wind reaches Force 4 with a speed of 5 m/s. When the wind reaches 7 m/s and the significant wave height reaches 26 cm, waves play a more significant role than currents in the dynamic processes of the seabed sediment resuspension and lead to a high value of turbidity that is approximately two to eight times higher than that in fair weather. These analyses clearly illustrate that periodic current-induced sediment erosion and resuspension are dominant in fair weather, whereas episodic high waves are responsible for significant sediment resuspension. Additional work is needed to establish a more thorough understanding of the mechanisms of sediment dynamics in the Jiaozhou Bay.
- seabed sediment /
- erosion /
- resuspension /
- tripod /
- Jiaozhou Bay

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文章访问数: 950
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基于原位观测的胶州湾沉积物侵蚀再悬浮过程研究

doi: 10.1007/s13131-016-1072-5

计量

出版历程

The observations of seabed sediment erosion and resuspension processes in the Jiaozhou Bay in China

计量

出版历程

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