干旱区地理2026，Vol.49Issue(7)：1360-1374,15.DOI:10.12118/j.issn.1000-6060.2025.537
可降解格状沙障对典型新月形沙丘风沙活动调控作用研究
Regulation effect of degradable lattice sand barrier on wind-sand activity of typical crescent dunes
摘要
Abstract
The Yabulai Mountain wind-sand gap,the largest convergence zone between the Badain Jaran Desert and the Tengger Desert,is subject to intense aeolian activity with complex sediment transport pathways,making it a critical area for the Three-North Shelterbelt Project.Through multi-profile gradient synchronous observations of wind and sand conducted at the foot,mid-slope,and crest of the windward slope of crescent-shaped dunes in this region,this study compares the structural characteristics of sand transport flows and the particle size differen-tiation patterns of wind-eroded sediments between biodegradable poly lactic acid(PLA)sand barriers and bare sand surfaces.The results indicate the following:(1)PLA sand barriers markedly suppress mid-to-high-level sedi-ment transport at the slope base(sediment-free above 30 cm).Sediment reduction rates at the mid-slope and crest reach 53%,although near-surface sediment transport remains high.The wind-sand flow structure in PLA sand bar-rier zones at the slope base and mid-slope shows an inflection point at 0-10 cm,deviating from the typical expo-nential decay trend.(2)Sediment transport at the base and crest of PLA sand barrier zones occurs primarily with-in the 0-30 cm range,whereas bare sand crests concentrate transport within 0-20 cm(accounting for 85%).Bare sand at the base and mid-slope,along with PLA sand barriers at the mid-slope,exhibit sediment transport across the full 0-100 cm range.(3)The particle size distribution of wind-eroded material falls primarily between 100 and 500 μm,with saltation as the dominant transport mechanism(volume fraction>95%).At the bare sand slope crest,the proportion of suspended particles increased markedly to approximately 25%within the 2-10 cm range,whereas suspended transport at the same elevation on the bare sand mid-slope accounted for only about 4%.At the mid-slope,transport occurred primarily via saltation within the 50-100 cm range,accompanied by minor sus-pended transport(approximately 8%)and creep transport(approximately 5%).The cumulative distribution curves for PLA sand barriers exhibit consistent patterns,with particle motion dominated by saltation.(4)The average grain size of wind-eroded material shows a fluctuating decrease with increasing elevation,indicating good sort-ing.The distribution displays moderate kurtosis and near-symmetric skewness.(5)PLA sand barriers produce a central erosion-type single-funnel concave surface at the slope base and mid-slope,while the slope crest develops a northwest-trending accumulation ridge and a double-funnel concave structure.Considerable gradient differenc-es in erosion and accumulation depths are observed across different slope positions.PLA sand barriers effectively suppress dune migration by altering near-surface wind-sand flow structures and sediment grain size composition,providing data support for ecological protection at wind-sand convergence zones.关键词
PLA沙障/输沙粒度特征/凹曲面/风沙流结构/雅布赖山风沙口Key words
PLA sand barrier/sediment transport grain size characteristics/concave surface/sand and wind flow structure/Yabulai Mountain sand and wind gap引用本文复制引用
蒙仲举,安花,刘静,李浩年,孟芮冰,杨毅,李晓阳,刘明心,翟波..可降解格状沙障对典型新月形沙丘风沙活动调控作用研究[J].干旱区地理,2026,49(7):1360-1374,15.基金项目
内蒙古自治区揭榜挂帅项目(2024JBGS0009) （2024JBGS0009）
内蒙古自治区直属高校基本科研业务费(BR22-13-03) （BR22-13-03）
内蒙古自治区高等学校加强我国北方重要生态安全屏障建设研究专项资助 （）
