人为干扰下海岸沙丘表面粒度分布变异实证研究——以河北昌黎黄金海岸横向沙脊为例  

Research on Variation of Distribution Model of Grain Size on Coastal Transverse Ridge Under Influence of Human Activities

作　　者：董玉祥[1] 马骏[1] 黄德全[1] 

机构地区：[1]中山大学地理科学与规划学院,广东广州510275

出　　处：《中国沙漠》2008年第2期202-207,共6页Journal of Desert Research

基　　金：国家自然科学基金项目(40571019)资助

摘　　要：选择我国海岸沙丘尤其是横向沙脊最为典型的河北昌黎黄金海岸,分别在人为干扰剧烈和人为干扰较少的区段,按垂直于横向沙脊走向各选择一个典型的横向沙脊断面,采集其表面沙质沉积物粒度样品,通过对样品粒度及其参数的分析与计算,对比分析人为干扰对海岸沙丘表面粒度分布的可能影响。结果表明,在滑沙和迎风坡脚沙质地表翻动与堆积沙堆等人为影响下,横向沙脊表面粒度分布发生了明显变异,由近自然状态下自沙脊两侧坡脚向脊顶粒径变细和分选变好、向陆背风坡的细化与分选优于向海迎风坡、脊顶沙粒最细及向陆背风坡脚最粗的自然分布模式转变为人为干扰下自两侧坡脚向沙脊坡部粒径变细与分选变好、向海迎风坡的细化与分选优于向陆背风坡、向海迎风坡粒径最细及迎风坡脚最粗的人为分布模式。Two profiles on typical coastal transverse ridge,located at Changli Gold Coast zone in Hebei Province which is one of the most typical coastal Aeolian distribution regions in China and famous for the tall and typical transverse ridges,were chosen to compare the variation of distribution model of grain size on coastal dune,one profile represented the sample influenced by human activities and the other represented the sample uninfluenced by human activities.On two profiles,there were 107 sand samples collected on typical coastal transverse ridge.The parameters of grain size of samples were analyzed and calculated by use of the number of mean size,standard deviation,skewness and kurtosis.The comparison of parameters of grain size of two profiles on coastal transverse ridge show the distribution characteristics of grain size of two profiles on coastal transverse ridge are distinct different.Under natural environment,the distribution model could be concluded as that the finest and the best sorting sands distributed on the top of coastal transverse ridge,the fining and sorting on the leeward slope are better than that on the windward slope and the coarsest sands distributed at its leeward slope bottom.Affected by the human activities,such as sliding and trampling of tourists on the top of transverse ridge as well as overturning and piling of coastal sands at the bottom of windward slope of coastal transverse ridge,the distribution characteristics of grain size on coastal transverse ridge became more fining and sorting from bottom to slope on the transverse ridges,the fining and sorting of sands on the windward slope are better than that on the leeward slope,the finest sands distributed at the windward slope and the coarsest sands distributed at the bottom of windward slope.

关 键 词：海岸沙丘 横向沙脊 粒度分布 变异 人为干扰 

分 类 号：X144[环境科学与工程—环境科学]