| 动态图像法应用于海滩沉积物粒度粒形测试及其与筛析法的比较 |
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| 引用本文： | 罗章,蔡斌,陈沈良.动态图像法应用于海滩沉积物粒度粒形测试及其与筛析法的比较[J].沉积学报,2016,34(5):881-891. |
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| 作者姓名： | 罗章 蔡斌 陈沈良 |
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| 作者单位： | 1.华东师范大学河口海岸学国家重点实验室 上海 200062; |
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| 基金项目： | 海洋公益性行业科研专项(201405037)Public Science and Technology Research Funds Projects of Ocean |
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| 摘 要： | 筛析法是海滩沉积物粒度分析较经典和常用的方法。随着科学技术的发展，利用动态图像法分析沉积物粒度逐渐得到推广。本文利用动态图形法和筛析法对海南岛5个海滩剖面20组沉积物样品进行粒度粒形测试，并将两种方法所测得的粒度进行比较。测试分析结果显示，该方法的测试结果重复性好，精度高；通过与筛析法的对比显示，动态图像法与筛析法的测试结果非常接近，粒度级配曲线基本一致，各个粒度参数值很接近且相关性非常好（R2>0.94）；由动态图像法得出的粒形参数可以看出，粒径相当的不同海滩沉积物粒形参数有很大差别，同一海滩不同部位的球形度和宽长比变化很大，对称度和凹凸度变化稍小。研究表明，动态图像法与筛析法之间的粒度分析差异主要来自于两者测量原理的不同和天然海滩砂颗粒形状的不规则；动态图像法解决了不规则沉积物粒度的测量。因此，动态图像法可以替代筛析法来测量沉积物粒度，应用前景广阔。
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| 关 键 词： | 动态图像法 Camsizer XT 海滩沉积物 粒度参数 筛析法 |
| 收稿时间： | 2015-10-21 |
Grain Size and Shape Analysis of Beach Sediment using Dynamic Image Analysis and Comparison with Sieving Method |
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| LUO Zhang,CAI Bin,CHEN ShenLiang.Grain Size and Shape Analysis of Beach Sediment using Dynamic Image Analysis and Comparison with Sieving Method[J].Acta Sedimentologica Sinica,2016,34(5):881-891. |
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| Authors: | LUO Zhang CAI Bin CHEN ShenLiang |
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| Institution: | 1.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;2.Retsch Technology, Shanghai 201204, China |
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| Abstract: | The sieving analysis is a classic and common method used to measure the particle sizes of beach sediments. With the development of scientific technology, grading analysis by dynamic digital imaging has been widely popularized. We analyzed the particle size and the shape of 20 sediment samples from 5 beaches of Hainan Island by the methods of dynamic image analysis and sieving analysis, and then compared the testing results of the particle size analyzing from the two methods. The results of the dynamic image analysis indicate that this technique has good repeatability and high accuracy. By comparing the results obtained from digital dynamic imaging with those from sieving analysis, we can conclude that the results match well:the grading curves intersect, the particle size parameter values are close and their relevance is rather good (R2>0.94). Analyzing the particle shape parameter values from the digital dynamic images, we learn that there are obvious differences between different coastal segments with similar particle sizes. The sphericity and aspect ratio of particles from different parts of the same beach change greatly, while their symmetry and convexity change slightly. The study indicates that the different results obtained from the two methods mainly derived from their different measurement principles and the irregular particle shapes of beach sediments. The digital dynamic imaging method has completely solved the problems caused by particle shape irregularity, so it can nearly replace sieving analysis in measuring particle size, which has a broad application prospect. |
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| Keywords: | dynamic image analysis Camsizer XT beach sediment grain-size parameters sieving analysis |
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