论文部分内容阅读
通过对渤海湾西岸L剖面中同一关键层的碳酸钙和原生腹足类壳体的14C测年对比研究,确定了晚全新世约2800calBP的层位及沉积速率0.045cm/a;8个样柱的137Cs和210Pbexc强度、蓄积量揭示了距今约120年来堤后盐沼的平均沉积速率约为0.35cm/a,而面向开放海湾的潮坪上部则达到约2～3cm/a。研究区近1个世纪以来沉积速率的加速趋势,是渤海湾西岸泥质海岸带的特征之一。
Based on the 14C dating of calcium carbonate and protozoal gastropod shells in the same key layer in the L section of the west bank of the Bohai Bay, we determined that there were about 2800 calBP layers and a deposition rate of 0.045 cm / a in the late Holocene. Eight sample columns The 137Cs and 210Pbexc intensities reveal the average deposition rate of post-dike salt marshes is about 0.35cm / a in about 120 years and about 2 ~ 3cm / a in the upper part of the tidal flat facing the open gulf. The accelerating trend of sedimentation rate in the study area in the last century has been one of the characteristics of the muddy coastal zone on the west coast of Bohai Bay.