| 李志星1，2，李志忠1，2，3*，靳建辉1，2，3，白 利4，程 延1，2，徐晓琳1，2，张文静1，2.河北昌黎海岸沙丘粒度参数特征的风沙环境意义[J].海南师范大学学报自科版,2020,33(1):92-102 |
| 河北昌黎海岸沙丘粒度参数特征的风沙环境意义 |
| The Significance of Aeolian Environment Reflected by Particle SizeParameters of Coastal Dunes in Changli, Hebei Province |
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| DOI：10.12051/j.issn.1674-4942.2020.01.016 |
| 中文关键词: 海岸沙丘 粒度组成 粒度参数 风沙环境 冬季风 |
| 英文关键词: coastal dnes particle size composition particle size parameters aeolian environment winter monsoon |
| 基金项目:国家自然科学基金项目（41771020）；福建省自然科学基金项目（2017J01460） |
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| 中文摘要: |
| 海岸带的风沙活动规律是沙质海岸演变研究的重要内容。文章以中国温带季风区昌
黎翡翠岛沙丘海岸作为研究区，对不同地貌单元表层沙粒度参数及其反映的风动力时空变化特征
进行系统分析。在此基础上，以风沙沉积剖面的OSL年龄作为时间标尺，以风成沙平均粒径作为
风力强度的代用指标，提取海岸风沙沉积记录的风力强度变化序列，为海岸风沙治理及保护管理
提供科学依据。结果表明：（1）研究区沙丘沙具有典型的风成沙特征，表层沙样以横向沙脊沙平均
粒径最大，而横向沙脊表层沙样又具有自丘顶向两侧坡脚粗化的趋势，分选程度由迎风坡向背风
坡逐渐变好；（2）各个探坑剖面的粒度参数均呈现出较为明显的波动变化，其中丘间地剖面粒度参
数变化幅度整体上大于横向沙脊剖面；（3）近200 a来，海岸风沙平均粒径指示的冬季风盛衰变化
历史可以划分为 1760—1820 AD（冬季风强度整体较弱）、1821—1900 AD（冬季风相对强盛）和
1901AD至今（冬季风活动波动减弱）三个阶段。 |
| 英文摘要: |
| The pattern of aeolian activities in coastal zone is an important for the research on the evolution of sandy coast.
In this paper, the sandy coast of Feicuidao in Changli, which is located in temperate monsoon region of China, was choosen
as our study area. The spatio-temporal variation characteristics of wind force reflected by the grain size parameters of the
surface sand deposit in different geomorphic units were systematically analyzed. On this basis, OSL dating method was ap⁃
plied to get chronological information of the deposition, and the average particle size of sand was taken as the proxy index of
wind intensity so as to extract the wind intensity variation sequence. The results showed that: (1) sand deposit of dunes were typical aeolian sand the average particle size of the surface sand deposit was the largest on the transverse sand ridge, and it
showed a tendency of coarsening from the top to the bottom of the ridge on both sides, and the sorting degree gradually im⁃
proved from the windward to the leeward slope. (2) the particle size parameters of sand deposit fluctuated significantly with
depth of profiles, and the particle size parameters of the sand deposit in the interdune trough showed a more pronunced fluc⁃
tuation than in the transverse ridge. (3) In the past 200 years, the winter monsoon fluctuation history indicated by the mean
particle size of coastal sand deposit could be divided into three phrases: 1760~1820AD, the winter monsoon is relatively
weak as a whole; 1821~1900AD, winter monsoon is relatively strong; since 1901AD, winter monsoon weakened volatility. |
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