黄河三角洲埕岛近岸海域悬浮泥沙运动

OFFSHORE SUPENDED SEDIMENT TRANSPORT IN HUANGHE DELTA CHENGDAO MARINE AREA

根据1998年9月8日和1999年3月19日两次对埕北海域进行的10个站位的同步海流、悬浮泥沙观测资料 ,进行该海区的悬浮泥沙输运趋势分析 ,发现该海区含沙量较大 ,从整个海区来看 ,底层含沙量大于表层含沙量 ,该海区泥沙含量普遍表现为东南部的泥沙含量高于西北部的泥沙含量 ;由单宽输沙量的计算及有关资料分析可以得出 ,秋季泥沙运移趋势是由东南向到西北向 ,而春季泥沙的运移趋势是由东北向到西南向 ;含沙量是随流速的加大而增加 ,含沙量的峰值稍滞后于流速的峰值 ;该海区为冲蚀海区 ,悬浮泥沙产生的平均年冲刷量为2cm/a 。

Data for current and suspended sediment in the Chengdao offshore area was co llected on Sepetmber 8,1998 and on March 9,1999. This paper analyzes trends in s uspended sediment transport. Results suggest a high level of suspended sediment generally, whith a higher concentration in the lower layers than the upper layer . The southeast area was also higher than the northwest area. Based on sediment discharge of unit width and other data, sediment fransport in Autumn was from the Southeast to the northwest but, in spring, was from the northeast to the sou thwest. The larger the ocean current, the higher the sediment concentration.The peak value of sediment discharge lags the sea current peak. The study area is al so an erosion area, with a average erosion rate is 2 cm/a, this plays a secondar y role in the formation of submarine topography.