库姆塔格沙漠三垄沙地区砾波纹形态、粒度及环境风况  

Morphology,grain size and environmental wind regine of granule ripples in the Sanlongsha area of the Kumtagh Desert

作　　者：郭酉元 钱广强 杨转玲 邢学刚 Youyuan Guo;Guangqiang Qian;Zhuanling Yang;Xuegang Xing(Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Geography and Resources,Guizhou Education University,Guiyang 550018,China)

机构地区：[1]中国科学院西北生态环境资源研究院沙漠与沙漠化重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]贵州师范学院地理与资源学院,贵州贵阳550018

出　　处：《中国沙漠》2024年第4期37-45,共9页Journal of Desert Research

基　　金：国家自然科学基金项目(42071016,42241110);贵州省基础研究计划(自然科学类)项目(黔科合基础-ZK[2021]一般187)。

摘　　要：砾波纹是由双峰沉积物组成的粗颗粒风沙地貌,其发育与形态、粒度和风况之间的关系鲜有报道。通过野外考察、实地观测和实验分析等手段,对三垄沙地区典型砾波纹的形态、粒度以及其发育地区的风况特征进行了初步的研究。结果表明:研究区砾波纹脊线长度为1.23~24.05 m,平均为5.22 m。波纹间距2.62~4.73 m,平均间距为2.52 m。砾波纹的高度0.07~0.41 m,平均为0.18 m,形态指数为17.61。沉积物粒度分布为双峰或三峰分布,表层(0~1 cm)和下层(1~5 cm)平均粒径均值分别为0.64Φ和1.32Φ,表层峰顶处颗粒平均粒径为-0.91Φ。研究区平均风速为4.19 m·s-1,起沙风平均风速为8.65 m·s-1,主要在夏季。研究区年输沙势为804.88 VU,各季节风向变率大于0.8,属低变率风况,春季和夏季输沙势较大,占全年总量的67.1%。合成输沙方向为200.2°,基本垂直于砾波纹的脊线走向。Granule ripple is a coarse-grained aeolian sand geomorphology composed of bimodal sediments,but the relationship between its development and wind regime,grain size and morphology is rarely reported.By means of field investigation,field observation and experimental analysis,the grain size and morphology of typical granule ripples and the characteristics of wind regime in Sanlongsha area are studied.The results show that the length of granule ripples ridge in the study area ranges from 1.23 m to 24.05 m,with an average of 5.22 m.The average spacing between the ripples is 2.52 m,and the range is between 2.62 m and 4.73 m.The height of the granule ripples is between 0.07 m and 0.41 m,the average is-0.91Φ,and the RI index is 17.61.The particle size distribution of the sediments is bimodal or trimodal.The average particle size of the surface(0-1 cm)and the sublayer(1-5 cm)is 0.64Φand 1.32Φ.The average wind speed in the study area is 4.19 m·s~(-1),and the average sand-driving wind speed is 8.65 m·s~(-1).The main wind season is in summer.The annual drift potential in the study area is 804.88 VU,and the seasonal wind direction variability is greater than 0.8,which belongs to low wind variability,and the drift potential is large in spring and summer,accounting for 67.1%of the annual total.The RDD is 200.2°,which is basically perpendicular to the movement direction of the granule ripples.

关 键 词：库姆塔格沙漠 砾波纹 形态 粒度 输沙势 

分 类 号：P931.3[天文地球—自然地理学]