Modelling the dispersal and depositional processes of the suspended sediment in the central South Yellow Sea during the winter
Modelling the dispersal and depositional processes of the suspended sediment in the central South Yellow Sea during the winter
复制标题
模拟南黄海中部冬季悬浮沉积物的扩散和沉积过程
DOI：
10.1002/gj.2827
复制
发表时间：
2016-08-01
影响因子：
1.8
通讯作者：
Li, Guangxue
中科院分区：
文献类型：
--
作者：
Gao, Fei;Qiao, Lulu;Li, Guangxue
南黄海中心泥质区是黄海环流系统在8000年前稳定下来后形成的，其特征是细粒颗粒。南黄海中部泥质区的分布和厚度均根据2012年中海系统中部8个高分辨率海底剖面的解译进行了更新。该区域主要位于北纬34.5°～36.5°、东经122°～124.5°范围内，呈北西厚、南东薄的“+”字形。最大厚度可达11m。同时，南黄海中部泥质区与环山东半岛斜坡沉积体的过渡带存在一条弱沉积带。本文建立了冬季风驱动环流下的数值模拟，研究悬浮泥沙的扩散和沉积过程。研究表明，潮汐弱流低能区的存在是控制南黄海中部泥质区的主要因素，与前人的研究结果相似，但我们发现沉积物在冬季是由黄海暖流输送的。冬季，黄海暖流可将南方泥沙带入这里，我们认为它是输送泥沙进入泥质区的主要动力。模拟结果与实测的弱沉积带吻合较好；受黄海暖流和黄海沿岸流切变锋控制。剪切锋起到了“水障”的作用，阻止了黄海沿岸流携带的沉积物直接扩散到泥质区，也阻止了黄海暖流携带的沉积物扩散到沿岸带，从而出现了弱沉积带。版权所有 (c) 2016 约翰·威利父子有限公司
The muddy area in the centre of the South Yellow Sea (SYS) is formed and characterized by fine-grained particles since the Yellow Sea circulation system became stable before 8000years. The distribution and thickness of the central South Yellow Sea muddy area are both updated based on the interpretation of eight high-resolution sub-bottom profiles in central SYS, 2012. The area mainly locates within 34.5 degrees-36.5 degrees N, 122 degrees-124.5 degrees E, showing thick in the north and west and thin in the south and east with a +' shape. The maximum thickness is up to 11m. Meanwhile, there appears a weak deposition belt in the transition zone between the central South Yellow Sea muddy area and the slope deposit body surrounding Shandong Peninsula. In this paper, a numerical simulation under wind-driven circulation in winter is established to study the dispersal and depositional processes of the suspended sediment. Studies show that the presence of a weak-current-low-energy area by the tide is the primary factor to control the muddy area in central South Yellow Sea with similar results to previous research, but we find that the sediment is transported by the Yellow Sea Warm Current in winter. In winter, the Yellow Sea Warm Current can carry the southern sediment into here and we believe that it is the main driving force to transport sediment into the muddy area. The weak deposit band of the simulation result and measurement matched well; it is controlled by the shear front of the Yellow Sea Warm Current and the Yellow Sea Coastal Current. The shear front plays the role of a water barrier' to prevent the sediment carried by the Yellow Sea Coastal Current spreading directly to the muddy area and the sediment carried by the Yellow Sea Warm Current spreading to the coastal zone, so the weak deposit band arose. Copyright (c) 2016 John Wiley & Sons, Ltd.