近百年来人类活动对鸭绿江口河床演变影响的粒度沉积记录

Grain Size Sedimentary Records Representing Influence of Human Activities on Riverbed Evolution in Yalu River Estuary during Recent 100 Years

以鸭绿江口西汊道连续性较好的柱状沉积物为样本,对其210Pb年代、粒度特征和粒度参数进行了测定和分析,发现人类活动在沉积记录中有良好的粒度响应。其中,粒度对围海造地、航道治理等人类活动带来的河床演变最为敏感,水库拦截作用的粒度响应也比较清楚,对流域内的其它人类活动的粒度响应相对较弱。

The 210Pb dating, grain size characteristics and grain size parameters of core sediments with by better continuity collected in West - branch - way of Yalu River estuary were analyzed. It was found that human ac- tivities had good response to grain size. Among them, land reclamation and waterway regulation were the most sen- sitive factors to riverbed evolution. The interception effect of reservoir was also clear. The response of grain size to the other factors in human activities was relatively weak.