| 摘要: |
| 在海州湾海域采集了表层沉积物60 个, 经实验室分析获得了各采样点不同粒级组分的质量分数,在此基础上运用地统计学方法分析了砂、粉砂和黏粒三组分的空间变异特征, 并利用Kriging 插值方法绘制了相应的沉积物分布图。结果表明, 海州湾表层沉积物中砂和黏粒组分均具有较强的空间自相关性, 其空间自相关距离分别达到15 km 和28 km, 而粉砂则具有中等的空间自相关性, 自相关距离在12 km 左右; 在大于9 km 的尺度上, 3 种粒级沉积物的空间变异性表现出明显的各向异性特征。制图结果表明, 研究海域沉积物的总体组成状况是北部偏砂、南部偏黏、中部以粉沙为主。研究结果对连云港航道疏浚、整治及近海水产养殖规划等工作具有一定指导意义。 |
| 关键词: 沉积物 空间变异性 地统计学 海州湾 |
| DOI： |
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| 基金项目:江苏省高校自然科学基金项目(07KJD170012); 江苏省海洋资源开发研究院开放基金项目(JSIMR09B08); 淮海工学院自然科学基金项目(Z2008009) |
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| Characteristics of spatial variability of sediment grain size in the Haizhou Bay |
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LIU Fu-chengZ,HANG Cun-yong,PENG Jun
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| Abstract: |
| A total of 60 surficial sediment samples were collected in the Haizhou Bay in 2005, and the percentage of different sediment grain size components for each sample was also obtained through laboratory analysis. A geostatistics method, combined with Geographic Information System (GIS), was used to analyze spatial variabilities of the three sediment components (sand, silt and clay). The spatial variability of the different sediment components was apparent in isotropy within the maximum lag extent of 9 km, beyond which their anisotropy was increasing, especially between the perpendicular directions of NE40°and SE130°. The isotropic semivariograms showed that the ratios of nugget to sill for sand and clay were about 0.255 and 0.195, respectively, with the ranges of autocorrelation extending to about 15 km and 28 km, respectively, indicating that they had a relatively high strong autocorrelation. In comparison, silt had a middle strong autocorrelation with its ratio of nugget to sill and range being about 0.403 and 12 km, respectively. The maps of the three sediment components interpolated through block Kriging based on the fitted theoretical models depicted that the general sediment composition situation in the Haizhou Bay was clayey in the south, sandy in the north, and silty in the middle. |
| Key words: sediment spatial variability geostatistics the Haizhou Bay |
