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[1]MA Zhenghu,QU Xiangning,ZHAO Xini,et al.Grain Size Characteristics and Genesis Analysis of Sand Dunes on the South Bank of Lake Shahu in Ningxia[J].Research of Soil and Water Conservation,2019,26(06):267-273,279.

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Grain Size Characteristics and Genesis Analysis of Sand Dunes on the South Bank of Lake Shahu in Ningxia

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 06 Page number: 267-273,279 Column: Public date: 2019-10-17

Title:: Grain Size Characteristics and Genesis Analysis of Sand Dunes on the South Bank of Lake Shahu in Ningxia

Author(s):: MA Zhenghu^1,2, QU Xiangning^1,2, ZHAO Xini^1,2, LIU Yaqing^1,2, HE Zhirun^1,2; 1. State Key Laboratory Breeding Base of Land Degradation and Ecosystem Restoration, Ningxia University, Yinchuan 750021, China;
2. Key Laboratory of Northwest Degraded Ecosystem Restoration and Reconstruction, Ministry of Education, Ningxia University, Yinchuan 750021, China

Keywords:: sand dunes; granularity characteristics; causes; Lake Shahu of Ningxia

CLC:: P931.3

DOI:: -

Abstract:: The grain size characteristics of sand dune can reflect the sand source, transportation, sort and wind intensity during the formation of sand dunes, and can also reflect the influence of terrain and human activities on the movement of sand flow. Through sampling the samples in the depths of 0-5 cm, 20-25 cm, 25-50 cm along the linear dune chain on the south bank of Lake Shahu, the correlation analysis and McManus (1988) moment method were used for particle size analysis. The results show that the particle size components are mainly fine sand (33.72%~64.52%) and fine sand (29.12%~64.39%), and do not contain coarse sand and very coarse sand, the clay only exists in the eastward extension of the windward slope, particle size of the deeper layer is finer than that of the shallow layer in each part. The characteristics of the particle size parameters indicate that the average grain size of the sand ridge line is significantly higher than that of the other parts. Sorting is better in different parts of the dune and at different depths. The partial deviation of the sand ridge line and the control area was coarse and partial, and other parts were finely biased. The kurtosis is narrow and most of them belong to the extremely narrow kurtosis (Kg_φ>1.5), and the dune is more mature. The results show that the grain size components of sand dunes on the south bank of Lake Shahu are mainly fine sand and very fine sand, and the sand source is mainly from local sandy area. At the same time, wind force, sedimentary environment and human factors are also the important influences on processes of the formation and development of sand dunes.

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