地统计法支持的北部湾东部海域沉积物粒径趋势分析

doi:10.11821/xb200811010

地理学报 ›› 2008, Vol. 63 ›› Issue (11): 1207-1217.doi: 10.11821/xb200811010

地统计法支持的北部湾东部海域沉积物粒径趋势分析

马菲¹, 汪亚平^1,2, 李炎³, 叶长江¹, 徐志伟¹, 张凡¹

1. 南京大学地理与海洋科学学院, 南京210093;
2. 南京大学海岸与海岛开发教育部重点实验室, 南京210093;
3. 厦门大学海洋环境科学联合重点实验室, 厦门361005

收稿日期:2008-05-17 修回日期:2008-09-15 出版日期:2008-11-25 发布日期:2008-11-25
通讯作者: 汪亚平(1972-), 男, 教授, 主要从事沉积动力学、自然地理学研究。E-mail: ypwang@nju.edu.cn
作者简介:马菲(1987-), 女, 本科生, 地理科学专业。E-mail: mf.yeah@163.com
基金资助:
国家908 专项(908-01-ST09); 国家大学生创新训练计划项目(SIT-05); 教育部“新世纪优秀人才支持计划” (NCET-06-0446); 国家基础科学人才培养基金(J0630535)

The Application of Geostatistics to Analysis of Grain Size Trend in the Eastern Beibu Gulf

MA Fei¹, WANG Yaping^1,2, LI Yan³, YE Changjiang¹, XU Zhiwei¹, ZHANG Fan¹

1. School of Geographic and Oceanographic Science, Nanjing University, Nanjing 210093, China;
2. Ministry of Education Key Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093, China;
3. College of Oceanography and Environmental Science, Xiamen University, Xiamen 361005, China

Received:2008-05-17 Revised:2008-09-15 Online:2008-11-25 Published:2008-11-25
Supported by:
National 908 Project Program of China, No.908-01-ST09; National Undergraduate Innovation Education Program of China, No.SIT-05; Supported by Program for New Century Excellent Talents in University, No.NCET-06-0446; Talents in Basic Science of China, No.J0630535

摘要/Abstract

摘要：

在北部湾东部海域采集表层沉积物71 个，通过粒度分析获得其粒度参数(平均粒径、分选系数、偏态)，用克里格插值法将不规则采样站位的粒度参数内插为规则网格分布的相应粒度参数。采用地统计法分析其空间相关性，计算度量空间相关性范围的参数，即半方差图中的变程值。结果表明，使用地统计分析获得的粒度参数变程值物理意义较为明确，可作为粒径趋势分析模型的特征距离，其中分选系数变程值作为特征距离的计算结果与前人的海流、沉积物输运信息更为吻合；这在一定程度上消除了传统方法(试算法或经验估计法) 获取特征距离可能造成的模型计算误差。采用不同间距插值时得到的粒径趋势矢量具有不同的空间分辨率，其中高分辨率的细化图所反映的海底沉积物净输运趋势与余流和环流等所反映的沉积物输运细节特征吻合较好，低分辨率的概化图可大致反映该区域沉积物的总体输运趋势。地统计分析的结果对未来研究工作中采样间距的选取也具有指导意义。

关键词: 地统计法, 半方差图, 粒径趋势分析, 特征距离, 北部湾

Abstract:

A total of 71 surficial sediment samples are collected in the eastern Beibu Gulf, and then the moment parameters (i.e. mean size, sorting coefficient and skewness) are obtained by grain size analysis. By using kriging interpolating methods, the regular meshes of grain size parameters are calculated. A geostatistic analysis is applied to study the spatial autocorrelation for these parameters; while the range, a parameter in the semivariogram metering the bound of the spatial autocorrelation, is estimated. It shows that the range for sorting coefficient is physically meaningful, and also the obtained grain size trends are consistent with the annual ocean circulation pattern and sediment transport rates from previous studies. Thus, the range from the sorting coefficient variogram can be used as the characteristic distance in the grain size trend analysis model, which may remove the bias caused by traditional determination of characteristic distance (e.g. based on experience or testing methods). The sediment transport patterns are retrieved on the basis of grain size parameters interpolated with varied distances, which indicates that the small interpolation distance can produce better transport pattern with high resolution and give more detailed information. Hence, the results from geostatistic analysis can be guidable in determination of sampling stations density in the future field work.

Key words: geostatistic method, semi-variogram, grain size trend analysis, characteristic distance, Beibu Gulf

马菲,汪亚平,李炎,叶长江,徐志伟,张凡. 地统计法支持的北部湾东部海域沉积物粒径趋势分析[J]. 地理学报, 2008, 63(11): 1207-1217.

MA Fei, WANG Yaping, LI Yan, YE Changjiang, XU Zhiwei, ZHANG Fan. The Application of Geostatistics to Analysis of Grain Size Trend in the Eastern Beibu Gulf[J]. Acta Geographica Sinica, 2008, 63(11): 1207-1217.

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地统计法支持的北部湾东部海域沉积物粒径趋势分析

The Application of Geostatistics to Analysis of Grain Size Trend in the Eastern Beibu Gulf

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