【摘要】：選取榆商高速神木縣錦界鎮(zhèn)路段兩側(cè)緊鄰公路的沙丘和距離公路較遠(yuǎn)未經(jīng)人為擾動(dòng)的原始沙丘,采集沙丘表層沉積物進(jìn)行粒度特征分析.結(jié)果表明,S20高速公路錦界鎮(zhèn)路段兩側(cè)沙丘以中沙和粗沙為主,其次為細(xì)沙,極粗沙和粉沙含量都很少.公路西北側(cè)沙丘平均粒徑略大于東南側(cè),分選系數(shù)均較好,兩側(cè)沙丘的偏度均為負(fù)偏,峰度主要為中等型.公路建設(shè)改變了局地近地表氣流發(fā)展,使得高速路兩側(cè)風(fēng)速增大,并且呈現(xiàn)從西北向東南風(fēng)速逐漸減小的規(guī)律,進(jìn)而導(dǎo)致兩側(cè)沙丘表層沉積物粒徑分布出現(xiàn)明顯差異.
[Abstract]:The sand dunes adjacent to the highway and the original dunes which are far away from the highway in Jinjie Town of Shenmu County are selected and the surface sediment of the sand dunes is collected to analyze the granularity characteristics of the sand dunes. The results show that the sand dunes are mainly medium sand and coarse sand, followed by fine sand, and the content of extremely coarse sand and silt is very little. The average diameter of the sand dunes in the west and north side of the highway is slightly larger than that in the southeast side, and the sorting coefficient is better. The deviation of the sand dunes on both sides is all negative, and the kurtosis is mainly of the medium type. The highway construction changes the local near surface air flow development, increases the wind speed on both sides of the highway, and gradually reduces the wind speed from northwest to southeast, which leads to the obvious difference in the grain size distribution of surface sediment on both sides of sand dunes.
【作者單位】： 陜西師范大學(xué)旅游與環(huán)境學(xué)院;中國(guó)科學(xué)院寒區(qū)旱區(qū)環(huán)境與工程研究所中國(guó)科學(xué)院沙漠與沙漠化重點(diǎn)實(shí)驗(yàn)室;內(nèi)蒙古師范大學(xué)蒙古高原環(huán)境與全球變化實(shí)驗(yàn)室;
【基金】：中央高�；究蒲袠I(yè)務(wù)費(fèi)專(zhuān)項(xiàng)資金資助項(xiàng)目(GK201604011)
【分類(lèi)號(hào)】：U418.56
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本文編號(hào)：2259415