摘要
本文报道了笔者于渤海湾采集的9个柱样品,用^(210)Pb法测定的现代沉积速率;^(210)Pb剖面揭示出人类和自然原因所产生的沉积事件。并对该湾的沉积过程进行了探讨。 海河口844站^(210)Pb剖面反映出六十年代初,天津新港进行水下工程时出现瞬时堆积的记录;1041站记录了1964年一次雍潮出现的高速沉积带。从而,表明人类和自然对现代沉积作用的贡献,并且,指出这对海洋工程、沉积学及环境科学研究均十分重要。
210Pb dating has determined modern sedimentation rate for 9 cores from Bohai Bay. It is found that sedimentation rate is relatively high off the Haihe River mouth (generally over 15mm/yr, and even up to 40-50mm/yr near the bay apex), and gradually decreases in anchorage and outer sea area, usually less than 8mm/yr.
Radioactive profiles of the sediments have revealed important events in modern sedimentary environments, core column at site 1041 records the time of the Huanghe River flood and channel changes; and 210Pb profile from site 844 reflects the'instant accumulation'caused by human activities.
We think that studies of modern sedimentation rate can be able to unco ver both man-made and natural events and this is very significant to ocean development engineering and scientific researches of environment.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1990年第3期15-22,共8页
Marine Geology & Quaternary Geology
关键词
渤海湾
海洋
沉积物
沉积
速率
Bohai Bay marine sediments sedimentation rate 210Pb
