摘要
以三门峡坝下河漫滩湿地为研究对象,探讨^(137)Cs及^(210)Pb计年法应用于沉积速率研究的可行性。三门峡坝下河漫滩沉积物柱^(137)Cs及^(210)Pb计年分析表明:1964年及1986年的^(137)Cs蓄积峰峰形完好,^(137)Cs计年法用于沉积速率推算可行;由于沉积过程为快速堆积且受水文扰动较大,^(210)Pbex比活度—深度曲线呈现出不规则的摆动,而非指数衰减曲线,因此^(210)Pb计年法不适用于沉积速率推算;基于^(137)Cs计年法计算得出1954—1963年、1964—1985年、1986—2015年的沉积速率分别为3.50、1.82、1.17 cm/a,沉积速率受水库调度运行方式影响显著。
137Cs and210Pb dating techniques were applied for the sediment core in the downstream river floodplain of Sanmenxia Reservoir toexplore the feasibility of study on sedimentation rate. There were obvious peaks of137Cs in 1964 and 1986 in the sediment core,which meantthe137Cs dating technique was applicable for the study on sedimentation rate. However,the210Pb dating technique was not suitable because ofthe rapid deposition process and hydrological disturbance. Based on the137Cs dating technique,sedimentation rates in three periods were cal-culated,which were 3.50 cm/a（from 1954 to 1963）、1.82 cm/a（from 1964 to 1985）and 1.17 cm/a（from 1986 to 2015）respectively.The sedimentation rates were inflected seriously by reservoir operation.
出处
《人民黄河》
CAS
北大核心
2017年第4期62-65,共4页
Yellow River
基金
国家自然科学基金资助项目(21447007)
