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  • CN 62-1070/P
  • ISSN 1000-694X
  • 双月刊 创刊于1981年
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沙漠与沙漠化

草原区植被对土壤风蚀影响的风洞模拟试验研究

  • 刘艳萍1 ,
  • 刘铁军1 ,
  • 蒙仲举2
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  • 1.水利部牧区水利科学研究所, 内蒙古 呼和浩特 010020;
    2.内蒙古农业大学, 内蒙古 呼和浩特 010019

收稿日期: 2012-09-22

  修回日期: 2012-12-01

  网络出版日期: 2012-12-01

Wind Tunnel Simulation Test on the Influence Factorsof Wind Erosion in Grassland Areas

  • LIU Yan-ping1 ,
  • LIU Tie-jun1 ,
  • MENG Zhong-ju2
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  • 1.Institute of Water Resources for Pastoral Area, Hohhot 010020, China;
    2.Inner Mongolia Agricultural University, Hohhot 010019, China

Received date: 2012-09-22

  Revised date: 2012-12-01

  Online published: 2012-12-01

摘要

在前期研究的基础上,选择内蒙古乌兰察布荒漠草原区为研究区域,通过野外移动风洞模拟试验,开展荒漠草原植被对土壤风力侵蚀影响的定量化分析研究,旨在探讨不同植被盖度下空气动力学粗糙度的变化、不同植被盖度下的风沙流结构特征及植被盖度与风蚀输沙率的定量关系,从而为水土流失机理研究提供理论依据。试验研究表明:空气动力学粗糙度随着地表植被盖度的增加呈三次函数关系增加,拟合函数为Z0=ax3+bx2+cx+d;随着距地高度的增加,各层收集到的风蚀量呈不同程度降低,随着地表植被盖度的增加,各层输沙量也均降低;不同风速下植被盖度与风蚀输沙率之间呈幂函数相关。

本文引用格式

刘艳萍1 , 刘铁军1 , 蒙仲举2 . 草原区植被对土壤风蚀影响的风洞模拟试验研究[J]. 中国沙漠, 2013 , 33(3) : 668 -672 . DOI: 10.7522/j.issn.1000-694X.2013.00096

Abstract

Based on previous studies, selecting desert grasslands in the Ulanqab League of the Inner Mongolia as studied area, we carried out a quantitative analysis on influence of vegetation coverage on wind erosion by simulation test with a field mobile wind tunnel, which aimed at discussing the change of aerodynamic roughness and flow structure features under different vegetation coverage, and the quantitative relationship between vegetation coverage and sediment yield. Results show that aerodynamic roughness increases linearly approximately with the increase of vegetation coverage, and linear functional relationship is Z0=ax3+bx2+cx+d. With the increasing of the height above the ground, sediment yield decreases. With the increase of vegetation coverage, sediment yield at each layer also reduces. Under different wind speeds, the relation between sediment yield of wind erosion and vegetation coverage is related by a power function. The conclusion will provide a theory basis for soil and water loss mechanism research.

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