| LIU Xiaolei,ZHU Chaoqi,ZHENG Jiewen,GUO Lei,YIN Ping,JIA Yonggang. 2017. The observations of seabed sediment erosion and resuspension processes in the Jiaozhou Bay in China. Acta Oceanologica Sinica, 36(11):79－85 |
| The observations of seabed sediment erosion and resuspension processes in the Jiaozhou Bay in China |
| 基于原位观测的胶州湾沉积物侵蚀再悬浮过程研究 |
| Received:April 09, 2016 Revised:January 04, 2017 |
| DOI：10.1007/s13131-016-1072-5 |
| Key words:seabed sediment erosion resuspension tripod Jiaozhou Bay |
| 中文关键词: 海床沉积物 侵蚀 再悬浮 三脚架 胶州湾 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | LIU Xiaolei | 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 | | | ZHU Chaoqi | 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 | | | ZHENG Jiewen | Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China | | | GUO Lei | Qingdao Institute of Marine Geology, Chinese Geology Science, Qingdao 266071, China | | | YIN Ping | Qingdao Institute of Marine Geology, Chinese Geology Science, Qingdao 266071, China | | | JIA Yonggang | 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 | pingyin@fio.org.cn |
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| 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. |
| 中文摘要: |
| 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。 |
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