Abstract

The composition of bottom sediments in the Simmy River (the Amur River tributary, the Bolon Nature Reserve, Khabarovsk krai, Russia) was studied using laser diffractometry, sedimentation analysis, and electron microscopy. It was found that the grain-size composition of sediments from the area treated was mainly constituted by small-size grains and characterized by the accumulation of fine sand which conformed to lacustrine–alluvial genesis of the territory. The sediments in the near-mouth area were mainly formed by particulate alluvium with prevailing silty fraction. The definitive effect on the composition of sediments is exerted by hydrological conditions of Lake Bolon receiving the riverine waters: the variations in the lake water level conform to those in the Amur River. It was shown that the coagulation and precipitation of suspended solids at low content of organic matter (below 1%) resulted in the appearance of volume-aggregated dense and viscous sediments. A higher content of organic matter (>6% in the Kirpu tributary of the Simmy River) caused the “nodal” differentiation of volume-aggregated spatial structures to form porous microaggregates.

中文翻译：

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Bolon自然保护区西米河底沉积物的粒度组成

摘要

使用激光衍射，沉积分析和电子显微镜研究了西米河（阿穆尔河支流，波隆自然保护区，俄罗斯哈巴罗夫斯克州）的底部沉积物组成。结果发现，处理区的沉积物的粒度组成主要由小颗粒组成，其特征是细砂的积累与该地区的湖泊冲积成因相吻合。近口区域的沉积物主要由颗粒冲积物和主要粉质组分形成。接受河流水的博伦湖的水文条件对沉积物成分具有决定性的影响：湖泊水位的变化与阿穆尔河的变化一致。结果表明，在低有机物含量（低于1％）下，悬浮固体的凝结和沉淀导致出现体积聚集的致密和粘性沉积物。较高的有机质含量（西米河基尔普支流中> 6％）导致体积聚集的空间结构“节点”分化，形成多孔的微聚集体。