关键词：
临策铁路;防沙明洞;新月形沙丘;粒度分异
摘 要：
本文通过临策铁路防沙明洞影响区内外新月形沙丘各部位粒度特征参数的对比研究,探明了防沙明洞对新月形沙丘粒度特征的影响分异规律。研究表明:(1)防沙明洞改变了影响区内新月形沙丘的自然风场结构,地表沙物质呈现粗粒化、粒径均匀程度提高、粒径分布集中的特点。(2)防沙明洞上风向沙丘各个部位沙物质粗粒化程度均高于下风向沙丘,上风向沙丘迎风坡、下风向沙丘背风坡粒度变化最显著。(3)防沙明洞上风向沙丘运动状态受冬季风控制,风蚀作用强于堆积作用,而下风向沙丘运动状态受夏季风控制,堆积作用强于风蚀作用。
译 名：
OPENCUT TUNNEL OF SAND PREVENTION TO GRAIN SIZE CHARACTERISTICS OF DIFFERENTIATION AT BARCHAN DUNES IN LINHE-CEKE RAILWAY
作 者：
LEI Pengfei,ZUO Hejun,CHEN Shichao(Inner Mongolia Agricultural University,Inner Mongolia Hohhot,010019)
关键词：
Linhe-Ceke railway;opencut tunnel of sand prevention;barchan dunes;grain size characteristics
摘 要：
Based on the analysis of sand particle size's features around Linhe-Ceke railway,proven that the regularity features of sand movement in the study area and the shed on the impact of Barchan dunes.This study shows that :(1)the opencut tunnel of sand prevention affect the old wind structure of open cut tunnel of sand prevention,sand particle size became more coarse-grained,more homogeneous distribution and more concentrate distribution.(2)The coarse-grained degree of all parts of the sand dunes' upwind ward were higher than the downwind ward,the particle size change significant in the frontal of upwind ward and leeward side of downwind ward.(3) Because of the control of opencut tunnel of sand prevention'motion by Winter Monsoon,wind erosion is stronger than stacking at upwind ward,however stacking interaction is stronger than wind erosion at downwind ward by the control of summer monsoon.
