黄河三角洲埕北海域底质沉积物粒度特征及泥沙输运分析

发布时间：2018-08-08 20:41

【摘要】：通过黄河三角洲埕北海域表层沉积物的粒度资料、实测潮流数据以及50a一遇的波浪要素,分析了埕北海域表层沉积物的分布类型以及粒度参数特征,并计算了表层沉积物的临界起动应力、日平均单宽输沙通量以及波流共同作用下的单宽推移质输沙率。结果表明:研究区表层沉积物主要是粉砂质砂、砂质粉砂、粉砂和泥四种,分选中等偏差,近对称到正偏,中等尖锐到尖锐峰态;对大潮期间埕北海域潮流底应力和表层沉积物的临界起动应力的计算说明潮流在大部分区域具有起动和输运泥沙的作用;秋季潮流作用下的日平均单宽输沙通量均值为372.32kg/(m·d),方向为涨潮流向。利用贝克尔(Bijker)和经典的Van Rijn公式计算出的50a一遇的波流共同作用下单宽推移质日平均净输沙率结果近似相等。
[Abstract]:Based on the grain size data of the surface sediments in Chengbei sea area of the Yellow River Delta, the measured tidal current data and the wave elements once in 50 years, the distribution types and grain size parameter characteristics of the surface sediments in Chengbei sea area are analyzed. The critical incipient stress of surface sediment, the daily average single width sediment transport flux and the single width bed load transport rate under the combined action of wave and current are calculated. The results show that the surface sediments in the study area are mainly silty sand, silty sand and mud. The calculation of the bottom stress of the tidal current and the critical starting stress of the surface sediment in Chengbei sea area during the spring tide shows that the tidal current has the function of starting and transporting sediment in most areas. The average daily mean single width sediment transport flux under the action of autumn tidal current is 372.32kg/ (m d), direction, which is the direction of high tide flow. By using Becker (Bijker) and the classical Van Rijn formula, the results of daily average net sediment transport rate of order width bed load are approximately equal.
【作者单位】：中国海洋大学海洋地球科学学院;中国海洋大学海底科学与探测技术教育部重点实验室;
【基金】：国家重点基金——黄河沉积物环山东半岛陆架的搬运和沉积过程及机制研究(41530966)
【分类号】：P736.21

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