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

doi:10.12118/j.issn.1000-6060.2025.537

干旱区地理 ›› 2026, Vol. 49 ›› Issue (7): 1360-1374.doi: 10.12118/j.issn.1000-6060.2025.537 cstr: 32274.14.ALG2025537

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

蒙仲举¹^,²(), 安花¹^,², 刘静³, 李浩年¹^,², 孟芮冰¹^,², 杨毅¹^,², 李晓阳¹^,², 刘明心¹^,², 翟波⁴

¹ 内蒙古农业大学沙漠治理学院，内蒙古呼和浩特 010018
² 内蒙古自治区风沙物理与防沙治沙工程重点实验室，内蒙古呼和浩特 010018
³ 水利部牧区水利科学研究所，内蒙古呼和浩特 010020
⁴ 集宁师范学院地理科学与规划学院，内蒙古乌兰察布 012000

收稿日期:2025-09-05 修回日期:2025-10-27 出版日期:2026-07-25 发布日期:2026-07-07
作者简介:蒙仲举（1980-），男，博士，教授，主要从事荒漠化防治研究. E-mail: mengzhongju@126.com
基金资助:
内蒙古自治区揭榜挂帅项目(2024JBGS0009);内蒙古自治区直属高校基本科研业务费(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

Regulation effect of degradable lattice sand barrier on wind-sand activity of typical crescent dunes

MENG Zhongju¹^,²(), AN Hua¹^,², LIU Jing³, LI Haonian¹^,², MENG Ruibing¹^,², YANG Yi¹^,², LI Xiaoyang¹^,², LIU Mingxin¹^,², ZHAI Bo⁴

¹ College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China
² Key Laboratory of Aeolian Physics and Desertification Control Engineering from Inner Mongolia Autonomous Region, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China
³ Institute of Water Resources for Pastoral Area of the Ministry of Water Resources of China, Hohhot 010020, Inner Mongolia, China
⁴ School of Geography and Planning, Jining Normal University, Ulanqab 012000, Inner Mongolia, China

Received:2025-09-05 Revised:2025-10-27 Published:2026-07-25 Online:2026-07-07

摘要/Abstract

摘要：

雅布赖山风沙口作为巴丹吉林沙漠和腾格里沙漠的最大交汇处，风沙活动强烈、输沙路径复杂，是“三北”工程治理的重要区域。基于该区新月形沙丘迎风坡坡底、坡中、坡顶的多剖面梯度风沙同步观测，对比分析生物基可降解聚乳酸（PLA）沙障与裸沙的风沙流结构特征及风蚀物粒径分异规律。结果表明：（1） PLA沙障对坡底中高层输沙具有显著抑制作用（>30 cm无沙），PLA沙障坡中与坡顶减沙率达53%，但近地表输沙量仍较高，PLA沙障坡底和坡中的风沙流结构在0~10 cm出现拐点，偏离典型指数递减趋势。（2） PLA沙障坡底和坡顶输沙主要集中于0~30 cm，裸沙坡顶集中在0~20 cm（占比85%），裸沙坡底、坡中和PLA沙障坡中在0~100 cm均有输沙。（3）风蚀物粒径主要分布在100~500 μm之间，跃移为主导输运方式（体积分数>95%）；裸沙坡顶在2~10 cm的悬移颗粒占比显著提高（约为25%），而裸沙坡中同高度悬移仅约4%，在50~100 cm以跃移为主，伴随少量悬移（约为8%）和蠕移（约为5%）；PLA沙障的累积曲线变化规律较一致，颗粒运动以跃移为主。（4）风蚀物平均粒径随高度增加呈波动式下降趋势，分选性较好，峰态中等，偏度为近对称型。（5） PLA沙障在坡底与坡中形成中心侵蚀型单漏斗凹面，坡顶则发育西北向堆积棱线与双漏斗凹面结构，不同坡位蚀积深度呈显著梯度差异。PLA沙障通过显著改变近地表风沙流结构与输沙粒径组成，有效抑制沙丘迁移，为风沙口生态防护提供了数据支撑。

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

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 differentiation 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 sediment 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 barrier zones at the slope base and mid-slope shows an inflection point at 0-10 cm, deviating from the typical exponential decay trend. (2) Sediment transport at the base and crest of PLA sand barrier zones occurs primarily within 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 suspended 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 sorting. 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 differences 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.

Key words: PLA sand barrier, sediment transport grain size characteristics, concave surface, sand and wind flow structure, Yabulai Mountain sand and wind gap

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.

MENG Zhongju, AN Hua, LIU Jing, LI Haonian, MENG Ruibing, YANG Yi, LI Xiaoyang, LIU Mingxin, ZHAI Bo. Regulation effect of degradable lattice sand barrier on wind-sand activity of typical crescent dunes[J]. Arid Land Geography, 2026, 49(7): 1360-1374.

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距地面200 cm风速/m·s^-1	下垫面	风速廓线回归方程	空气动力学粗糙度/cm	摩阻流速/m·s^-1
6.06	PLA沙障坡底	U_Z=2.27ln Z+0.91，R²=0.99	0.67	0.91
6.06	裸沙坡底	U_Z=1.87ln Z+1.77，R²=0.99	0.38	0.75
7.68	PLA沙障坡中	U_Z=3.05ln Z+0.85，R²=0.97	0.76	1.22
7.68	裸沙坡中	U_Z=1.90ln Z+3.24，R²=0.99	0.18	0.76
9.15	PLA沙障坡顶	U_Z=3.29ln Z+1.44，R²=0.98	0.65	1.31
9.15	裸沙坡顶	U_Z=1.92ln Z+4.54，R²=0.96	0.09	0.78

特征指示	PLA沙障坡底	裸沙坡底	PLA沙障坡中	裸沙坡中	PLA沙障坡顶	裸沙坡顶
Q_0~2/g·cm^-2·min^-1	0.0028	0.0053	0.0754	0.1810	0.1517	0.2015
Q_2~10/g·cm^-2·min^-1	0.0075	0.0082	0.2968	0.3419	0.4290	0.3404
特征值	2.68	1.55	3.94	1.89	2.83	1.69

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

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