Grain size characteristics and sedimentary environment of surface sediments in East Juyan Lake

¹ Heihe Water Resources and Ecological Protection Research Center, 730030 Lanzhou, China
² Heihe Ejina Water Resources and Ecological Protection Research Center, 735400 Alashan, China
³ College of Earth and Environmental Sciences, Lanzhou University, 730030 Lanzhou, China
⁴ Luanjingtan Yellow River High-lift Irrigation Development Center, 750312 Alax, China

^* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract

East Juyan Lake is the tail lake of Heihe River. It not only plays an important role in maintaining the local ecological environment, but also has certain significance for the protection of East Juyan Lake wetland. In this paper, the grain size analysis of 72 surface sediment samples collected from East Juyan Lake was carried out. The results show that the average particle size of the sediments is between 3.76φ ~ 7.31φ, with an average value of 6.43φ. The types are mainly clay and silt, mostly sandy clayey silt and sandy clayey silt. The particle size is mainly characterized by the distribution of fine in the south and coarse in the north, coarse in the near shore and fine in the far shore, which is obviously affected by hydrodynamic conditions and source supply. The separation is poor, and the material source is diverse, which affects the uniformity of particle size. There are three types of sedimentary environment in the East Juyan Lake. The first type is located in the lakeside area, the second has general hydrodynamic conditions because the water depth is between the first type of sedimentary area and the third type of sedimentary area. The third has the deepest water depth, weak hydrodynamic conditions and the finest average particle size in the three areas.