img

Wechat

Adv search

JOURNAL OF DESERT RESEARCH ›› 2018, Vol. 38 ›› Issue (2): 262-269.DOI: 10.7522/j.issn.1000-694X.2016.00156

Previous Articles     Next Articles

Effects of Biodegradable Poly Lactic Acid Sand Barriers on Surface Sediment Grain-size Characteristics at Sand Dunes

Ding Yanlong1, Gao Yong1,2, Wang Ji1,3, Sun Xiaorui1, Dang Xiaohong1,3, Han Yanlong1, Li Peng1   

  1. 1. Desert Science and Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China;
    2. Wind Erosion Key Laboratory of Central and Local Government, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China;
    3. National Positioning Observation Research Station of Hangjin Desert Ecosystem, Ordos 017400, Inner Mongolia, China
  • Received:2016-08-08 Revised:2016-11-17 Online:2018-03-20 Published:2018-03-20

Abstract: In this research, the surface layer(0-3 cm) of different specifications PLA(Poly Lactic Acid) sand barriers in the northern Jilantai Salt Lake was selected to analyse the grain-size characteristics. The sediment particle size distributions were identified by using laser diffraction technique. The grain-size characteristics parameters, such as average particle size, sorting, skewness and kurtosis were determined, then calculated and analysed sand-fixation benefits of sand barriers. The results indicated that the sediment particle size was mainly made up of fine sand, medium sand and very fine sand. The medium sand, very fine sand and fine sand were the key factors that affected the sediment particle thickness in the sand barriers. The PLA sand barrier increased the content of medium sand and coarse sand, decreased the content of fine particles, and the sorting became worse, the kurtosis deviated from normal distribution and turned negative partial. The frequency distribution curves became wider, while the cumulative frequency curve became slow. The sediment particle size distributions tended to be coarsen. The sand drift activities inside the 1m 1m specification PLA sand barriers on the entire sand dune was deposition. The sand drift activities in 2m 2m and 3m 3m sand barriers at windward and leeward slope performed as deposition as well, while the top of sand dune was erosion. Considering laying costs and protective effects, 2m 2m was the best specification of PLA sand barriers for the study area.

Key words: grain-size characteristics, sediment, PLA sand barriers, Jilantai Salt Lake

CLC Number: