Sand blocking effect and grain size characteristics of Jilantai Salt Lake protection system

doi:10.7522/j.issn.1000-694X.2021.00202

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (4): 50-59.DOI: 10.7522/j.issn.1000-694X.2021.00202

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Sand blocking effect and grain size characteristics of Jilantai Salt Lake protection system

Xuewei Guan¹^,²(), Caiyi Yang¹, Guangming Liu²(), Ji Wang³, Meng Xiao¹, Yanlong Ding⁴, Jinlin Chen¹()

^1.Co -Innovation Center for Sustainable Forestry in Southern China，Nanjing Forestry University，Nanjing 210037，China
^2.Institute of Soil Science，Chinese Academy of Sciences，Nanjing 210008，China
^3.Desert Science and Engineering College，Inner Mongolia Agricultural University，Hohhot 010019，China
^4.College of Tourism，Inner Mongolia University of Finance and Economics，Hohhot 010070，China

Received:2021-10-11 Revised:2021-11-25 Online:2022-07-20 Published:2022-08-29
Contact: Guangming Liu,Jinlin Chen

Abstract

Abstract:

Wind-blown sand hazard is one of the important factors restricting the exploitation of resources in desert saline-alkali lake region. It is of great significance to study how to prevent and control the wind-blown sand hazard by protective effect in this region to realize the sustainable exploitation of salt lake resources. Therefore， this study takes the protection system of Jilantai Salt Lake as the research object. Through the method of field positioning monitoring and indoor analysis， the monthly sediment flux at different parts of the protection system is observed to explore the sand movement mode of the protection system of Jilantai Salt Lake and the variation law of monthly sediment flux， so as to provide data support for the effect evaluation of the protection system of Jilantai Salt Lake. The results showed that：（1） The wind speed from the mobile sand ridge to the center of the salt lake showed a trend of first decreasing and then increasing. In addition to the white thorn shrub， the wind speed of the plots was basically not affected by the wind direction. （2） Seasonal variation has a great influence on the sediment flux above 50cm height of the protection system except the shelterbelt. （3） During the observation period， the sediment transport flux in the 0-40 cm height range of the protection system accounted for 53.43%-96.63% of the total sediment transport flux， and the sand movement in the region was mainly dominated by jump. （4） From the flowing sand ridge to the center of salt lake， the distribution curve of sand particle size showed a bimodal type， and the sand particle size increased first， and reached the maximum at the saline-alkali beach， and then decreased slightly. In addition to the shelter belt， the sediment transport flux above 50 cm height of Jilantai Salt Lake protection system is greatly affected by the season， but the overall can still intercept 95.79%-99.93% of the sand， so as to effectively avoid the salt lake area.

Key words: sand transport flux, sand blocking effect, protection system, Jilantai Salt Lake

CLC Number:

P931.3

Xuewei Guan, Caiyi Yang, Guangming Liu, Ji Wang, Meng Xiao, Yanlong Ding, Jinlin Chen. Sand blocking effect and grain size characteristics of Jilantai Salt Lake protection system[J]. Journal of Desert Research, 2022, 42(4): 50-59.

Figures/Tables 9

Fig.1 Monthly distribution of mean annual sediment transport potential in Jilantai area

Fig.2 Composition of protection system

Table 1 The location， topography and vegetation characteristics of the observation plot

样地	经纬度	地貌状况	植被特征
流动沙垄	39°49′08″N，105°44′06″E	流沙，沙丘高度5—10 m，长200—500 m。沙面结构松散	沙垄上部无植被，丘间偶见沙米、白刺，盖度<10%
白刺灌丛	39°48′32″N，105°44′02″E	白刺沙包高度0.5—5 m，沙表面质软，半固定	白刺为主，灌丛之间有少量芦苇、沙米、苦豆子，盖度15%
防护林带	39°48′07″N，105°43′48″E	地面起伏较小，沙面有结皮	沙枣、花棒、梭梭，盖度80%
盐碱滩地	39°47′13″N，105°43′51″E	地势平坦，表面盐结皮发育	盐爪爪、碱蓬、芦苇，盖度30%
盐湖湖心	39°46′26″N，105°43′40″E	地势平坦，覆沙表面为盐结皮	无植被

Fig.3 Long-term wind speed observation sample points （A）and long-term sand collection instrument deployment （B）

Fig.4 Changes of wind speed profile in different parts of the protective system under different wind

Fig.5 Different roughness and friction speed of the protection system

Fig.6 Sediment flux in different parts of the protection system in a year

Fig.7 The total amount of sediment transported in different parts of the protection system in each month during a year

Fig.8 The particle size characteristics of the sand transported by the protection system

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Sand blocking effect and grain size characteristics of Jilantai Salt Lake protection system

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