摘要:
以乌裕尔河依安段沉积体为研究对象,通过对乌裕尔河依安大桥剖面考察及对依安县境内乌裕尔河沉积体挖探槽、探坑,结合样品的粒度分析结果,详细研究了其沉积特征。研究表明,乌裕尔河依安段为细粒曲流河沉积体,在垂向上总共形成了3期沉积旋回,主要发育河道、河漫滩和天然堤3种沉积亚相以及河床滞留沉积、点沙坝、河漫滩和沼泽4种微相。结合粒度分析结果,乌裕尔河依安段沉积体在C-M图上主要发育三段:递变悬浮段、均匀悬浮段和悬浮滚动段,反映了乌裕尔河水动力变化情况及沉积特征。
Abstract:
The sedimentary characteristics are treated in this study for the Yi'an area along the Wuyur River, Heilongjiang. The sediments herein are represented by the fine-grained meandering stream deposits, which vertically display three-phase depositional cycles, i. e. basal, middle and upper cycles, and may be grouped into three sedimentary subfacies, i. e. channel, overbank and natural levee subfacies, and four sedimentary microfacies, i. e. channel lag deposits, point bar, overbank and backswamp microfacies. The CM patterns based on the granulometric analysis of 30 pieces of samples from individual horizons in the middle cycles display three parts of sediment grain size curves, including the fining-upward graded suspension, homogeneous suspension, and roll suspension, respectively.
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