Sediment transport off the Huanghe (Yellow River) delta and in the adjacent Bohai Sea in winter and seasonal comparison
Sediment transport off the Huanghe (Yellow River) delta and in the adjacent Bohai Sea in winter and seasonal comparison
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DOI：
10.1016/j.ecss.2010.06.005
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发表时间：
2011-07
影响因子：
2.8
通讯作者：
Zuosheng Yang;Youjun Ji;N. Bi;K. Lei;Houjie Wang
中科院分区：
文献类型：
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作者：
Zuosheng Yang;Youjun Ji;N. Bi;K. Lei;Houjie Wang
利用2006年11月黄河三角洲外3个时间序列船载站和临渤海24个格网站3个调查样带的流速、水温、盐度、浊度和悬沙浓度资料，研究了冬季条件下黄河三角洲外、临渤海的输沙情况，并与夏季条件下的输沙情况进行了比较。水柱中盐度、温度和沉积物的均匀分布表明水体混合良好。在三角洲沿岸发现了一个高悬沙浓度带（SSC），其宽度为35 km。在废弃的刁口黄河口和现今黄河口周围的表层和中层存在两个最高的SSC中心，在废弃的清水沟黄河口周围的底层存在第三个最高的SSC中心。这三个最高的SSC中心在冬季成为主要的沙源区。根据高底切应力区位置、盛行波方向和河口凸起地形特征，确定了冬季风暴波和潮流流共同作用下三个最高南海温中心的再浮成因。3个沿海样带的悬沙通量（SSF）表明，三角洲西北部的沉积物在最近三角洲叶的海岸向东北和东南方向移动。冬季SSC和SSF分别是夏季的1.7 ~ 27.1倍和2 ~ 122.5倍。这说明冬季输沙强度要比夏季强得多，但夏季入海河水量和输沙量要大得多，这是由于冬季风暴的强大作用。夏季由于水动力较弱，大量的黄河入海泥沙聚集在狭窄的沿海地区，冬季主要受风暴潮的强烈再悬浮作用向近海输送。黄河三角洲沿海地区夏季为泥沙汇区，冬季为泥沙源区，是对东亚季风季节变化的响应。1976 - 2003年黄河水下三角洲的侵蚀堆积模式表明，河载泥沙主要沉积在南部沿海地区，也是冬季向南输沙强烈的结果。
Based on the data on the current velocity, water temperature, salinity, turbidity and concentration of suspended sediment collected in November 2006 along three survey transects at three time-series, ship-based stations off the Huanghe (Yellow River) delta, and at twenty-four grid survey stations in the adjacent Bohai Sea, sediment transport off the Huanghe delta and in the adjacent Bohai Sea under winter regime were studied and compared with those from the summer season. The homogeneous distribution of salinity, temperature and sediment in the water column indicated a well-mixed body of water. A zone of high suspended sediment concentrations (SSC) >100 mg l−1with a width of 35 km was identified along the delta coast. Two highest SSC centers were found in the surface and middle water layers around the abandoned Diaokou Huanghe river mouth and the present Huanghe river mouth, and the third one in the bottom layer around the abandoned Qingshuigou Huanghe river mouth. These three highest SSC centers become major sediment source areas in winter. Based on the location of the high bottom shear stress zone, the prevailing wave directions and the protuberant topography of the river mouths, we identified the resuspension origin of the three highest SSC centers caused mostly by the winter storm waves, partially by tidal currents. Suspended sediment flux (SSF) along the three coastal transects indicated that the sediment in the northwest part of the delta was transported northeastward and southeastward along the coast of the recent delta lobe. The SSC and SSF were higher in winter than summer by 1.7–27.1 and 2–122.5 times, respectively, except around the present river mouth. This indicates that the intensity of sediment transport in winter is much stronger than in summer due to the powerful effect of winter storms although the river water and sediment discharges to the sea were much greater in summer. The massive Huanghe sediment to the sea was accumulated in a narrow coastal area due to weak hydrodynamics in summer, and then strongly resuspended mostly by storm waves in winter and transported to the offshore area. The coastal area off the Huanghe delta acts as a sediment sink in summer and converted to be a sediment source in winter in response to the seasonal variation of the East Asian monsoon in this region. The erosion–accumulation pattern of the Huanghe subaqueous delta from 1976 to 2003 illustrates that river-laden sediment is deposited mainly in the southern part off the coastal area and it is also the result of intensive southward sediment transport in winter.