| 聚乳酸（PLA）沙障凹曲面及沉积物粒度特征研究 |
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| 引用本文： | 王艺钊,原伟杰,丁国栋,虞毅,高广磊,章尧想,王陇.聚乳酸（PLA）沙障凹曲面及沉积物粒度特征研究[J].干旱区地理,2020,43(3):671-678. |
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| 作者姓名： | 王艺钊 原伟杰 丁国栋 虞毅 高广磊 章尧想 王陇 |
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| 基金项目： | 国家自然科学基金项目（31500586）；中央级公益性科研院所基本科研业务费专项（CAFYBB2016QB015）；国家自然科学基金项目（31270749）资助 |
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| 摘 要： | 在乌兰布和沙漠平坦沙地布设1 m×1 m 、1.5 m×1.5 m和2 m×2 m规格的聚乳酸(PLA)沙袋格状沙障，在风季后利用插钎法和激光衍射法分别测量障格内部凹曲面形态、测定表面0~3 cm沉积物粒度组成，分析不同规格沙障内部凹曲面形态特征、蚀积效应，计算平均粒径、标准偏差等粒度参数。结果表明：3种规格PLA沙障内部均能发育成稳定凹曲面，凹曲面深度随着规格的增大而逐渐增加，蚀积系数则逐渐减小，保持在1/12~1/10之间；障格内不同方位蚀积剖面曲线基本符合二次函数，但蚀积强度差异较大；1
m×1 m和1.5 m×1.5 m规格沙障处于堆积状态，堆积强度分别是侵蚀强度的50.1倍和5.6倍，易发生沙埋；2 m×2 m 规格障内单位体积蚀积量为0.02 g·cm-3，接近蚀积平衡状态，有利于长期发挥沙障防护效益；各规格障内沉积物均以极细沙和细沙为主，除1 m×1 m规格外，PLA沙障的阻滞作用使得极细颗粒含量百分比迅速下降。综合考虑沙障铺设成本和防护效果，得出在平坦沙地或者弱风区域内适合布设2 m×2 m 规格PLA沙障，研究结果可为PLA沙障在防沙工程中的合理应用提供科学参考。
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| 收稿时间： | 2019-08-23 |
Concave surface features and grain size
characteristics in polylactic acid sand barrier |
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| WANG Yi-zhao,YUAN Wei-jie,DING Guo-dong,YU Yi,GAO Guang-lei,ZHANG Yao-xiang,WANG Long.Concave surface features and grain size
characteristics in polylactic acid sand barrier[J].Arid Land Geography,2020,43(3):671-678. |
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| Authors: | WANG Yi-zhao YUAN Wei-jie DING Guo-dong YU Yi GAO Guang-lei ZHANG Yao-xiang WANG Long |
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| Abstract: | The features of concave surfaces,the effect of erosion
and deposition,grain size parameters of sediment (including average particle
size,standard deviation,skewness,and kurtosis) were analyzed separately in
three polylactic acid(PLA) sand barriers with different specifications,1 m × 1
m,1.5 m × 1.5 m,and 2 m × 2
m,which were laid on the flat sand in Ulan Buh Desert,Inner Mongolia,China.The
concave surfaces and sediment grain size characteristics of the surface layer
(0-3 cm) were measured using graduated sticks and laser diffraction methods
after the wind season.The results showed the three kinds of PLA sand barriers
could form stable concave surfaces.Along with the growth of sand barrier
specification,the depth of surfaces increased while the erosion deposition coefficient decreased in the range of 1/12-1/10.The
profiles in different directions basically fitted the quadratic
curve;nevertheless,the intensities of erosion-deposition varied widely.The 1 m × 1 m and 1.5 m × 1.5 m sand barriers stayed
in the deposition,of which deposition intensities were respectively 50.08,5.6
times the erosion intensities.The deposition intensities were 1.1 times the
erosion intensities and the erosion deposition volume
per unit was 0.02 g·cm-3 in the 2 m × 2 m sand barriers.In terms of
particle size and composition,we found that the sediment was mainly composed of
very fine sand,and with the exception of the 1 m × 1 m
specification,the retardation effect of PLA sand barriers resulted in a rapid
decrease in the content of very fine sand.The height of the PLA sand barriers
was 6-8 cm.The 1 m × 1 m and 1.5 m × 1.5 m sand barriers with large deposition intensities were prone to
sand burial and required additional labor costs for re-laying.The 2 m × 2 m sand barriers,blocked to erosion and deposition balance,were
beneficial to perform the long-term protective effect of sand
barriers.Considering the cost and protection effect of sand barriers,it was
concluded that the 2 m × 2 m PLA sand barriers were
suitable for flat sand or weak wind condition,and provided a scientific
reference for reasonable application in sediment control engineering. |
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