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地理学报  2008 

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, PP. 1207-1217

Keywords: 地统计法,半方差图,粒径趋势分析,特征距离,北部湾

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Abstract:

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。

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