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清华大学学报(自然科学版)  2017, Vol. 57 Issue (4): 337-344    DOI: 10.16511/j.cnki.qhdxxb.2017.25.001
  水利水电工程 本期目录 | 过刊浏览 | 高级检索 |
三江源风沙活动区沙漠化风险与风动沙含量关系
徐梦珍1,2, 李艳富3, 李志威4, 王兆印1,2, 韩鲁杰1
1. 清华大学 水沙科学与水利水电工程国家重点实验室, 北京 100084;
2. 清华大学 三江源协同创新中心, 北京 100084;
3. 南京水利科学研究院 水文水资源与水利工程科学国家重点实验室, 南京 210029;
4. 长沙理工大学 水利工程学院, 长沙 410015
Relationship between the desertification risk index and blowing sand content of typical aeolian erosion areas in Sanjiangyuan
XU Mengzhen1,2, LI Yanfu3, LI Zhiwei4, WANG Zhaoyin1,2, HAN Lujie1
1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;
2. Sanjiangyuan Collaborative Innovation Center, Tsinghua University, Beijing 100084, China;
3. State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China;
4. School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha 410015, China
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摘要 通过调查采样,分析了三江源多个典型风沙活动区的沙土颗粒成分,发现风动沙(最易蚀颗粒)含量与沙漠化程度间存在一定的关系。进而定义了用于表征区域发生沙漠化的风蚀风险指数,并应用到多种类型的土地的沙漠化风险评价中。分析结果表明:风蚀风险指数与风动沙百分含量直接相关,当区域内风动沙百分含量低于50%时,发生沙漠化的风险极低;当风动沙百分含量超过60%时,沙漠化风险随风动沙百分含量的增加而显著增长。因此,可通过判定区域样地中的风动沙百分含量,及时预警该区域在一定时期内发生沙漠化的风险,通过采取相关措施降低风动沙百分含量,抑制风动沙活动,结合合理有效的植被措施,可使活动沙丘逐步被固定下来。
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徐梦珍
李艳富
李志威
王兆印
韩鲁杰
关键词 三江源风险指数风动沙粒径级配矿物成分    
Abstract:Field investigations and samplings in typical aeolian erosion areas in Sanjiangyuan were taken to study the features of sediment particles. The sediment composition distributions of active, semi-fixed, and fixed sand dunes were analyzed to identify the components of blowing sand when eroded by wind. The content of the blowing sand then influences the desertification. A desertification risk index which indicates the risk of desertification for an area was defined and applied to assess the desertification risk of the aeolian erosion areas. The desertification risk index of the sampled areas was correlated with the blowing sand percentage. Desertification is unlikely when the blowing sand percentage was less than 50%, with the desertification risk increasing exponentially as the blowing sand percentage increased for percentages over 60%. Therefore, the blowing sand percentage is recommended as an index for indicating the desertification risk of a region. Strategies to reduce the proportion of blowing sand and promoting vegetation coverage are recommended for preventing desertification in the Sanjiangyuan region.
Key wordsSanjiangyuan    desertification risk index    blowing sand    grain size distribution    mineral composition
收稿日期: 2015-06-18      出版日期: 2017-04-19
ZTFLH:  TV141+.1  
引用本文:   
徐梦珍, 李艳富, 李志威, 王兆印, 韩鲁杰. 三江源风沙活动区沙漠化风险与风动沙含量关系[J]. 清华大学学报(自然科学版), 2017, 57(4): 337-344.
XU Mengzhen, LI Yanfu, LI Zhiwei, WANG Zhaoyin, HAN Lujie. Relationship between the desertification risk index and blowing sand content of typical aeolian erosion areas in Sanjiangyuan. Journal of Tsinghua University(Science and Technology), 2017, 57(4): 337-344.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2017.25.001  或          http://jst.tsinghuajournals.com/CN/Y2017/V57/I4/337
  图1 研究区域及采样点分布
  图2 不同类型沙丘表层泥沙粒径级配比较
  图3 活动沙丘不同深度处泥沙粒径比较
  图4 半固定沙丘不同深度处泥沙粒径比较
  图5 固定沙丘不同深度处泥沙粒径比较
  图6 活动沙丘(A)、半固定沙丘(SF)、固定沙丘(F)的表层物质的矿物成分比较
  图7 不同类型沉积物中风动沙含量比较
  图8 地表风蚀风险指数与风沙含量的关系
  图9 不同级配风沙活动区的比较
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