Grain size characteristics and spatial variation of aeolian sediments in the Haerteng River, Northeastern Qaidam Basin, China

doi:10.7522/j.issn.1000-694X.2019.00108

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (2): 68-78.DOI: 10.7522/j.issn.1000-694X.2019.00108

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Grain size characteristics and spatial variation of aeolian sediments in the Haerteng River, Northeastern Qaidam Basin, China

Tian Min^1,2, Qian Guangqiang¹, Yang Zhuanling^1,2, Luo Wanyin¹, Lu Junfeng¹

1. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2019-09-14 Revised:2019-12-10 Online:2020-03-20 Published:2020-04-26

Abstract

Abstract: Haerteng River, located in the northeast of Qaidam Basin, is a near-closed inland basin. The source of aeolian sediments in this area is relatively single with simple dune types and short-term development. Haerteng River is also an ideal place to study the material migration and aeolian geomorphic process in plateau inland basin. The grain size analysis of 115 sediments of different types and geomorphologic positions shows that the surface sedimentary types in this area include dune sand, interdune sediment, fluvial sediment and gobi sediment, which are mainly composed of fine sand with an average content of 51.6%. The mean grain size of the dunes is between 1.01 Φ and 2.90 Φ with the sorting parameters varying from 0.28 Φ to 1.74 Φ. The frequency curve shows a nearly symmetrical skewness and mesokurtic. The distinctive dome dunes, which is the early stage of barchan dunes, have a mean grain size from 1.55 Φ to 2.54 Φ and the sorting is from moderate to relatively good level. Although the characteristics of coarser particles and poorer separation from the middle of the windward and the leeward to the top of dome dunes are shown, the sorting process is weaker than the barchan dunes in the same area. From a regional perspective, the mean grain size of barchan from west to east becomes coarser and the sorting gets worse on the W-E cross section A and it is true of the NW-SE cross section B although the sorting in section B is irregular. The results indicate that the provenances of the aeolian sediments in this area include alluvial deposits of Haerteng River and weathering denudation products of mountains. This study is important for determining the successive relationship between provenances and sediments, exploring the characteristics of the early stage of aeolian geomorphology. Meanwhile, it can provide reference information for regional wind-sand control after the water transfer project from Haerteng River to Dang River.

Key words: Haerteng River, aeolian geomorphology, dunes, grain size, spatial variation

CLC Number:

P931.3

Tian Min, Qian Guangqiang, Yang Zhuanling, Luo Wanyin, Lu Junfeng. Grain size characteristics and spatial variation of aeolian sediments in the Haerteng River, Northeastern Qaidam Basin, China[J]. Journal of Desert Research, 2020, 40(2): 68-78.

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Grain size characteristics and spatial variation of aeolian sediments in the Haerteng River, Northeastern Qaidam Basin, China

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