| Li Bowen,Jia Yonggang,Liu J. Paul,Su Jianfeng,Liu Xiaolei,Wen Mingzheng.The controlling factors of high suspended sediment concentration in the intertidal flat off the Huanghe River Estuary[J].Acta Oceanologica Sinica,2020,39(10):96-106 |
| 黄河三角洲潮滩高浓度悬浮沉积物的控制因素 |
| The controlling factors of high suspended sediment concentration in the intertidal flat off the Huanghe River Estuary |
| 投稿时间：2020-05-21 |
| DOI：10.1007/s13131-020-1679-9 |
| 中文关键词: 沉积物再悬浮 泥沙运输 波浪 潮流 现场观测 |
| 英文关键词:Huanghe River (Yellow River) sediment re-suspension sediment transport wave current in-situ observation |
| 基金项目: |
| 作者 | 单位 | E-mail | | 李博闻 | 山东省海洋环境与地质工程重点实验室, 中国海洋大学, 青岛, 266100
海洋、地球与大气科学系, 北卡州立大学, 罗利, 北卡罗莱纳州, 27695, 美国 | | | 贾永刚 | 山东省海洋环境与地质工程重点实验室, 中国海洋大学, 青岛, 266100
海洋地质过程与环境功能实验室, 青岛海洋科学与技术试点国家实验室, 青岛, 266061 | yonggang@ouc.edu.cn | | 刘敬圃 | 海洋、地球与大气科学系, 北卡州立大学, 罗利, 北卡罗莱纳州, 27695, 美国 | | | 苏建封 | 海洋、地球与大气科学系, 北卡州立大学, 罗利, 北卡罗莱纳州, 27695, 美国
海洋地质国家重点实验室, 同济大学, 上海, 200092 | | | 刘晓磊 | 山东省海洋环境与地质工程重点实验室, 中国海洋大学, 青岛, 266100
海洋地质过程与环境功能实验室, 青岛海洋科学与技术试点国家实验室, 青岛, 266061 | | | 文明征 | 中国地质调查局天津地质调查中心, 天津, 300170 | |
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| 中文摘要: |
| 黄河口潮滩以其悬浮沉积物浓度高而闻名。但是，目前对其高浓度悬浮沉积物的控制因素和来源的了解尚不清晰。因此，本文基于黄河口潮滩上为期7天的水动力(水深，波高和水流速度)和悬浮沉积物浓度观测，对黄河口潮滩不同海况下悬浮沉积物的控制因素和来源进行分析。数据显示，在大部分时间里，黄河口潮滩处于1级海况下(波高小于0.1m)，SSC的变化范围为0.1-3.5 g/L，潮流的沉积物输运为悬浮沉积物的主要来源。但是，当水动力作用增强并且导致海底发生大规模侵蚀时，再悬浮沉积物成为了悬浮沉积物的主要来源，水体中的悬浮沉积物浓度可达到17.3 g/L。我们发现悬浮泥沙通量主要受平流输运的控制，而波浪引起的切应力也可通过影响悬浮泥沙浓度影响悬浮泥沙通量的变化。在观测期间， 1级海况下，流致再悬浮沉积物浓度(RSC)大于波致RSC。与此相反，在2级海况下，波致RSC大于流致RSC，例如，在观测期间出现的单个波浪事件导致6小时内海床被侵蚀了11.8 cm。该研究揭示了河控河流三角洲潮滩附近高悬浮沉积物浓度的不同控制因素，并有助于我们更好地了解三角洲的沉积和侵蚀机制。 |
| 英文摘要: |
| The Huanghe River (Yellow River) is known by its high suspended sediment concentration (SSC) in its river mouth tidal flat. However, the factors controlling the high SSC over there are not well understood. Therefore, we conducted 7-d hydrodynamic observations (water depth, wave height, and current velocity) and SSC measurements on the tidal flat off the Huanghe River Mouth. The data shows that in most of time, under the calm sea condition, the SSC ranges 0.1–3.5 g/L, and sediment discharge from the river is the main source. However, when hydrodynamics are enhanced in a tidal cycle and large-scale erosion occurs on the seafloor, resuspended sediment becomes the main source, and the SSC in the water column reaches 17.3 g/L. We find the suspended sediment flux is mainly controlled by the tidal current and Stokes drift, while the wave-induced shear stress could also affect the variation of suspended sediment flux. During the observation period, when sea under calm-rippled conditions, the current-induced resuspended sediment concentration (RSC) was greater than the wave-induced RSC. In contrast, in smooth-wavelet sea conditions, the wave-induced RSC was greater than the current-induced RSC, for instance, a single wave event was found to cause 11.8 cm seabed erosion within 6 h. This study reveals different controlling factors for the high SSC near a river-influenced tidal flat, and helps us get a better understanding of a delta's depositional and erosional mechanisms. |
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