| 库姆塔格沙漠羽毛状沙垄风沙活动强度特征 |
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| 引用本文： | 廖空太,李耀辉,刘虎俊,王继和,苏志珠,唐进年,丁峰,张景春,俄有浩,郑庆钟.库姆塔格沙漠羽毛状沙垄风沙活动强度特征[J].中国沙漠,2008,28(3):399-404. |
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| 作者姓名： | 廖空太 李耀辉 刘虎俊 王继和 苏志珠 唐进年 丁峰 张景春 俄有浩 郑庆钟 |
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| 作者单位： | 1.甘肃省荒漠化防治重点实验室/甘肃省治沙研究所, 甘肃 武威 733000; 2.中国科学院寒区旱区环境与工程研究所, 甘肃 兰州 730000; 3.中国气象局兰州干旱气象研究所, 甘肃 兰州 730020; 4.中国林业科学研究院, 北京 100091 |
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| 基金项目： | 甘肃省沙漠综合防治技术研究创新团队项目
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甘肃省科学事业项目
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甘肃省自然科学基金 |
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| 摘 要： | 以库姆塔格沙漠腹地的羽毛状沙垄为床面,通过风季实地观测与分析,研究了羽毛状沙垄的近地面风况、粒度特征及风沙流结构等。结果表明:羽毛状沙垄近地面风况具有明显的季节性,冬季盛行东风,其他季节盛行东北风;全年平均风速5.94 m·s-1,大于起沙风频率占总量的46.76%;新月形沙垄粒度变化在1.22～1.86之间,分选较好,垄间沙埂粒度变化在1.35～2.11之间,风选属于中偏差;随着风速的增大,地面以上0—2 cm高度层所含沙量有明显减少的趋势,2—20 cm所含沙量有增加的趋势,0—20 cm所含沙量占总输沙量的92.28%以上;在地面以上0—40 cm高度内,输沙率同2 m高处1 min平均风速为幂函数关系,不同性质的地表对输沙率有较大的影响;羽毛状沙垄的风速变化表现为新月形沙垄和垄间沙埂不同部位气流的增速和减速,风向变化表现为同风场下沙垄与沙埂风向夹角的存在。
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| 关 键 词： | 库姆塔格沙漠 羽毛状沙垄 风沙活动特征 |
| 文章编号： | 1000-694X(2008)03-0399-06 |
| 收稿时间： | 2007-4-26 |
| 修稿时间： | 2007年4月26日 |
Intensity of Sand-blown Activities over Feather-shaped Sand Ridge of Kumtag Desert |
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| LIAO Kong-tai,LI Yao-hui,LIU Hu-jun,WANG Ji-he,SU Zhi-zhu,TANG Jin-nian,DING Feng,ZHANG Jing-chun,E You-hao,ZHENG Qing-zhong.Intensity of Sand-blown Activities over Feather-shaped Sand Ridge of Kumtag Desert[J].Journal of Desert Research,2008,28(3):399-404. |
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| Authors: | LIAO Kong-tai LI Yao-hui LIU Hu-jun WANG Ji-he SU Zhi-zhu TANG Jin-nian DING Feng ZHANG Jing-chun E You-hao ZHENG Qing-zhong |
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| Institution: | 1.Gansu Key Lab of Desertification Combating; Gansu Desert Control Research Institute, Wuwei 733000, Gansu, China;2.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 3.Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China; 4.Chinese Academy of Forestry Science, Beijing 100091, China |
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| Abstract: | Through on-the-spot observation in windy season and data analysis a study on the wind regime, grain size characteristics and wind-sand flux structure near sand bed of feather-shaped sand ridge in the Kumtag Desert was conducted. The wind regime was seasonally changing, the E-dominated wind blew in winter and the N-E dominated wind blew in the other seasons. The annual average wind speed was 5.94 m·s-1 in the area, and the frequency of sand-blowing threshold wind was 46.76%. The grain size of barchan ridge was within 1.22—1.86, belonging to better rating, and the grain size between sandy ridges was within 1.35—2.11, belonging to weaker rating. With the increasing of wind speed, the sand content in wind-sand flux aboveground 0—2 cm reduced obviously; the content within 2—20 cm tended to increase, occupying more than 92.28% of the total. The sand-transporting rate of 0—40 cm height had power function relation with the average wind speed per minute at 2 m, in addition it was influenced strongly by different landforms. The wind regime over feather-shaped sand ridges appeared on the wind-speeding and wind-slowing in different positions of barchan and lowland, also on the variation of wind direction angle between that faced sand ridges. |
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