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山东半岛沿岸海域悬浮体时空分布及形成机制分析*
刘琳, 王珍岩
中国科学院 海洋研究所 海洋地质与环境重点实验室
摘要:
山东半岛沿岸是现代黄河沉积物向黄海输运的必经之地,是中国东部陆架海源汇过程研究的重要海区。本文依据2015年GOCI 影像反演的悬浮体浓度数据,分析了山东半岛沿岸海域表层悬浮体浓度和锋面月变化特征,揭示该海域悬浮体的分布特征和扩散格局,并结合风速、波高以及海表温度数据,对其控制因素进行初步探讨。结果显示:研究区内悬浮体浓度整体表现为冬季最高,春秋次之,夏季最低的分布特征;悬浮体扩散过程可以划分为四个阶段,冬季稳定外输,春季向岸退缩,夏季近岸贮存,秋季向外扩散。此外,山东半岛近岸存在一条悬浮体浓度高于10 mg/L的浑浊带,该浑浊带同样表现出季节变化,它在秋季开始形成,其悬浮体含量、幅宽及延伸范围在冬季达到最大,春季减弱,夏季消失。研究认为山东半岛沿岸海域的表层悬浮体来源主要是海底沉积物的再悬浮。风场、海浪以及沿岸流的强弱变化对悬浮体分布和输运的季节变化有重要的控制作用:风场和海浪影响海水混合搅拌强度,改变海底沉积物再悬浮作用的临界深度,进而影响表层海水悬浮体浓度,致使悬浮体浓度与风浪的月际变化趋势基本一致;沿岸流携带高浓度悬浮体沿山东半岛输运形成沿岸浑浊带,沿岸流的强度变化直接控制浑浊带的季节变化。
关键词:  山东半岛沿岸海域  GOCI  悬浮体浓度  风浪  沿岸流
DOI:10.11759/hykx20190312004
分类号:
基金项目:国家自然科学基金项目
Temporal and Spatial Distribution and Formation Mechanism of Suspended Sediment Concentration Suspension in the Coastal Area of Shandong Peninsula
LiuLin, Wang Zhenyan
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences
Abstract:
The coastal waters of the Shandong Peninsula are the necessary places where the modern Yellow River sediments are transported to the Yellow Sea. It is an important area for the study of the source-sink process in the East shelf seas of China. Based on the total suspension sediment (TSS) data of GOCI satellite in 2015, the monthly variation characteristics of suspended sediment concentration (SSC) and suspended sediment front in Shandong Peninsula were analyzed, and the formation mechanism was preliminarily discussed by using wind speed, wave height and sea surface temperature data. The results show that the distribution of TSS in Shandong Peninsula is the highest in winter, the second in spring and autumn, and the lowest in summer. The diffusion of TSS can be divided into four stages, namely, stable outward transport stage in winter, retreat to shore stage in spring, near shore storage stage in summer and the diffusion stage in autumn. There is a turbid water body with high SSC along the shallow coastal area of Shandong Peninsula. The turbidity zone also shows seasonal variation, that is, it begins to form in autumn, and SSC, width and extension length of the turbidity zone reach the maximum in winter, weakens in spring and disappears in summer.It is concluded that the main source of in the TSS coastal waters of Shandong Peninsula is the resuspension of seabed sediments. The variations of intensity about wind speed, wave and coastal current have an important control effect on the seasonal variation of SSC. The monthly variation of the wind and waves is basically synchronized with the monthly variation of SSC. The wind and waves change the critical depth of resuspension of seabed sediments by influencing the intensity of mixing and stirring of seawater, which provides the material source of TSS for surface seawater. The turbid zone is formed by the transport of high SSC along the coastal current along Shandong Peninsula, so the seasonal variation of the turbid zone is the same as the flow path and the intensity variation trend of the coastal current.
Key words:  coastal waters of Shandong Peninsula  GOCI  suspension concentration  wind and waves  coastal current
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