CAJ | 학술논문

2010年和2011年在鸭绿江西水道和西岸潮间带共采集4根柱状样，通过对210Pb测年、粒度、总有机碳、重金属元素等多指标综合分析，探讨了：(1)鸭绿江河口西水道和西岸潮间带柱状沉积物中重金属的垂向分布及其来源；(2)重金属分布的粒度控制作用；(3)不同时期的粒度和重金属分布变化及其对流域变化的响应。结果表明：(1)Cu和Zn可能来源于有机质降解的内源释放； Cr和Ni表征了岩石风化剥蚀形成陆源碎屑的自然来源；Cd和Pb反映了人类活动的影响。(2)除西岸潮间带的Cd和Pb含量可能部分受来源影响外，研究区的粒度效应是控制鸭绿江地区重金属含量分布的最主要因素。(3)粒度变化与流域演变密切相关，重金属含量对流域变化和人类活动响应明显，大致以1940年、1970年、1995年为界分为四个沉积阶段：1940年以前，自然演变对鸭绿江河口西岸潮间带的重金属分布控制明显，而1940年来至今，人类活动的控制作用日益凸显。
2010년화2011년재압록강서수도화서안조간대공채집4근주상양，통과대210Pb측년、립도、총유궤탄、중금속원소등다지표종합분석，탐토료：(1)압록강하구서수도화서안조간대주상침적물중중금속적수향분포급기래원；(2)중금속분포적립도공제작용；(3)불동시기적립도화중금속분포변화급기대류역변화적향응。결과표명：(1)Cu화Zn가능래원우유궤질강해적내원석방； Cr화Ni표정료암석풍화박식형성륙원쇄설적자연래원；Cd화Pb반영료인류활동적영향。(2)제서안조간대적Cd화Pb함량가능부분수래원영향외，연구구적립도효응시공제압록강지구중금속함량분포적최주요인소。(3)립도변화여류역연변밀절상관，중금속함량대류역변화화인류활동향응명현，대치이1940년、1970년、1995년위계분위사개침적계단：1940년이전，자연연변대압록강하구서안조간대적중금속분포공제명현，이1940년래지금，인류활동적공제작용일익철현。
Four sediment cores were collected at the western channel and the intertidal flats of the western Yalu River estuary in 2010 and 2011. We analyzed the 210Pb dating, grain size, total organic carbon (TOC), and heavy metal contents through the core to investigate the spatial distribution patterns and the sources of heavy metals in the west of intertidal flats of the Yalu River estuary. Furthermore, we analyzed the effect of grain size on the distribution of heavy metal contents and discussed the responses of variation of grain size and heavy metal contents to catchment flow dynamic changes in different periods. Also, the principal component analysis (PCA) and cluster analysis were applied to analyze the origin of heavy metal. Our observations show that the heavy metal Cu and Zn may originate from organic matter degradation. On the other hand, the sources of Cr and Ni are dominated by the rock erosion while Cd and Pb reflect the impacts of human activities. Further analysis indicate that, the distribution of heavy metal in the entire study area is mainly dominated by grain size effect, except that the contents of Cd and Pb are partly influenced by sources in the western intertidal flat of Yalu River Estuary. Moreover, the grain size variations are highly correlated to the catchment revolution, and the variations of heavy metal contents displayed remarkable response to anthropogenic activities and catchment fluid dynamic changes. Overall, the vertical distribution of heavy metal within the core sediments can be divided into four phases:before 1940, 1941-1970, 1971-1995, and 1996-2010. Before 1940s, the distribution of heavy metal was mainly subjected to a natural evolution;however, from 1940s to 2010s, human activities played a more important role in the distributions of heavy metals.