干旱区地理2025，Vol.48Issue(12)：2158-2168,11.DOI:10.12118/j.issn.1000-6060.2024.560
额哈铁路内蒙古段大风条件下几种下垫面风沙流输沙的粒度特征
Grain size characteristics of wind-blown sand transport on several underlying surfaces under strong wind conditions in Inner Mongolia section of Ejina-Hami Railway
摘要
Abstract
This study investigates the grain size characteristics of wind-blown sand flow over the gravel desert,moving sand dunes,and eroded hills,as well as the corresponding protective measures along a railway in the Go-bi area.The study is based on an analysis of the grain size characteristics of sand particles in the wind-blown sand flows of different underlying surfaces in the Inner Mongolia section of the Ejina-Hami(E-Ha)Railway,in the Go-bi area,combined with field observations and indoor laser-based particle-size analysis methods.Results revealed that the sand on the underlying surface of the K728+000～K843+000 section of the E-Ha Railway was mainly composed of fine sand,medium sand,and very fine sand.The particle-size frequency curve shows one peak distri-bution.The sand flow structure was exponentially distributed under natural conditions and sand control projects,and the sand composition differed significantly at various heights.In addition,under natural conditions,there was no significant change in sand material in the 0-4 cm layer,whereas in the 4-10 cm layer,very fine sand and fine sand were easily carried to higher levels by wind.The 10-50 cm layer was primarily composed of fine and medi-um sand,accounting for 83.57%of the railway sand.The blown-sand prevention and control project can decrease the fine and medium sand content in the low layer(0-20 cm)by 53.98%and effectively intercept 37.47%of the very fine sand in the high layer(20-50 cm).Lastly,in the height range of 0-50 cm,the vertical differentiation of each particle size component was significant.When the height increased,the average particle size decreased and the content of fine sand gradually increased.In the wind-blown sand flow of each underlying surface,there was a significant correlation between the contents of very fine sand and fine sand and height(P≤0.05).The sorting coef-ficient,kurtosis value,and skewness value increased with increasing height.When the height exceeded 50 cm,the sorting of sand in the wind-sand flow became worse and the characteristics of each particle size did not change significantly.关键词
风沙流/粒度特征/下垫面/额哈铁路/戈壁区Key words
wind-sand flow/grain-size parameter/underlying surface/Ejina-Hami Railway/Gobi area引用本文复制引用
GUO Qi,YAN Min,ZUO Hejun,LIU Yaqi,XU Fujian,JIANG Chunyu..额哈铁路内蒙古段大风条件下几种下垫面风沙流输沙的粒度特征[J].干旱区地理,2025,48(12):2158-2168,11.基金项目
内蒙古自治区自然基金项目(2021BS03039) （2021BS03039）
内蒙古自治区直属高校基本科研业务费项目(BR220504) （BR220504）
内蒙古自治区高等学校创新团队发展计划(NMGIRT2408)资助 （NMGIRT2408）
