蓬莱近岸海域夏季悬浮泥沙输运及控制因素  

Transport and control factors of suspended sediment in Penglai offshore area in summer

作　　者：甘双庆 朱龙海[1,2] 张立奎[3] 宋彦[4] 胡日军[1,2] 白杏 林超然 谢波 GAN Shuangqing;ZHU Longhai;ZHANG Likui;SONG Yan;HU Rijun;BAI Xing;LIN Chaoran;XIE Bo(College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;Key Laboratory of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Ocean University of China,Qingdao 266100,China;North China Sea Engineering Prospecting Institute,State Oceanic Administration,Qingdao 266100,China;North China Sea Marine Forecasting Center of State Oceanic Administration,Qingdao 266061,China;Business School of Jishou University,Jishou 416000,China)

机构地区：[1]中国海洋大学海洋地球科学学院,青岛266100 [2]中国海洋大学海底科学与探测技术教育部重点实验室,青岛266100 [3]国家海洋局北海海洋工程勘察研究院,青岛266100 [4]国家海洋局北海预报中心,青岛266061 [5]吉首大学商学院,吉首416000

出　　处：《海洋地质前沿》2023年第12期12-25,共14页Marine Geology Frontiers

基　　金：国家自然科学基金“山东半岛海湾对泥沙的捕获机制−−以威海湾为例”(41776059)。

摘　　要：基于2019年6月在蓬莱近岸海域实地观测获取的样品和数据,研究了海流、温度、盐度和悬浮泥沙的时空分布特征,利用小波分析、单宽通量机制分解和Richardson数等方法,探讨了悬浮泥沙的输运机制和控制因素。研究区悬浮泥沙在平面上呈以登州浅滩为中心向周围海域逐渐降低的分布特征,垂向上呈由表层至底层逐渐升高的趋势。悬浮泥沙浓度变化与潮流变化具有较好的正相关关系,但在时间上滞后1~2 h。研究区单宽净输沙率为7.84~43.12 g/(s·m)。平流输运在研究区悬浮泥沙输运过程中占主导地位,垂向净环流输运次之。潮流是研究区悬浮泥沙输运的主要动力,悬浮泥沙净输运方向与余流方向一致,登州水道南部悬浮泥沙由西向东输运,水道中部悬浮泥沙由东向西输运,南长山岛两侧悬浮泥沙呈向水道输运的趋势。研究区海域部分水体层化现象明显,水体混合受到抑制,悬浮泥沙的分布和输运受到潮流、水体混合和地形地貌共同控制。Based on the hydrological and sediment observation data in spring tide period in Penglai coastal waters in Bohai Sea in June 2019,we studied the temporal and spatial distribution characteristics of ocean current,temperature,salinity,and suspended sediment,and discussed the transport mechanism and control factors of suspended sediment by using wavelet analysis,single width flux mechanism decomposition,and the Richardson number.Results show that the concentration of suspended sediment in the study area is characterized by a gradual horizontal decrease from Dengzhou shoal to the surrounding sea area,and a gradual vertical increase from the surface layer to the bottom layer.There is a good positive correlation between suspended sediment concentration change and tidal current change with a time lag of 1~2 h.The net sediment transport rate per unit width is 7.84~43.12 g/(s·m).Advection transport plays a dominant role in suspended sediment transport in the study area,followed by vertical net circulation transport.Tidal current is the main driving force of suspended sediment transport.The net transport direction of suspended sediment is consistent with the residual current direction.The suspended sediment in the south of Dengzhou waterway is transported from west to east,while that in the middle of the waterway is transported from east to west,and those on both sides of Nanchangshan Island is transported to the waterway.The stratification phenomenon of some water bodies in the study area is obvious,the mixing of water bodies is suppressed,and the distribution and transportation of suspended sediment are controlled by the tide,the mixing of water bodies,and the topography.

关 键 词：蓬莱近岸海域 悬浮泥沙输运 控制因素 梯度Richardson数 通量机制分解 

分 类 号：P736.2[天文地球—海洋地质] P731[天文地球—海洋科学]