The texture of the Simmy bottom sediments ("Bolon'sky" reserve)

Abstract

The texture of bottom sediments of the Simmy River and its tributaries in the area of the “Bolon'sky” reserve (Khabarovskiy region, Far East) was studied with methods of laser diffractometry, sedimentation and electron microscopic analysis. It was found out that the texture of Simmy sediments in downstream is characterized by the accumulation of fine sand, which corresponds to alluvial-lake genesis of the studied area. In the wellhead part of river sediments are formed mainly by suspended sediments with a predominance of the clay fraction. This is due to the impact of the floodplain Bolon Lake, which level fluctuations correspond to changes in the level of water in the Amur River. It is shown that coagulation and deposition of suspended particles with low content of organic matter (< 1%) leads to the formation of volumetric aggregated, dense and viscous sediments. The high content of organic matter in sediments (> 6%, the Kirpy River, the tributary of the Simmy River) leads to the “nodal” differentiation of spatial structures and to the formation of porous microaggregates.

References

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