悬浮颗粒物粒径分布的幂律模型研究——以黄渤海为例

发布时间：2018-03-25 04:12

本文选题：黄渤海　切入点：悬浮颗粒物　出处：《海洋科学》2016年06期

【摘要】：为了准确地描述悬浮颗粒物粒径的分布特征,探索高精度的悬浮颗粒物粒径分布模拟,本文基于2014年11月黄、渤海的现场悬浮颗粒物粒径数据,研究了幂律模型在黄、渤海的适用性;同时,参考粒径作为幂律模型的重要参数,影响着幂律模型的斜率(颗粒粒径分布斜率)和模拟精度,因此对不同参考粒径下幂律模型的斜率变化情况以及模型模拟精度也进行了分析。结果显示:黄、渤海区域颗粒粒径分布斜率在0.46~7.53(均值:4.09),其中84.2%的斜率在3.2~4.5范围内;当参考粒径小于7.33μm时,颗粒粒径分布斜率变化大(均值为5.60±1.09),颗粒粒径分布模拟误差大,平均相对误差绝对值在20%~85%范围内,平均相对误差绝对值的平均值为48.2%;当参考粒径为7.33~19.8μm时,颗粒粒径分布斜率为4.08±0.29,颗粒粒径分布模拟的平均相对误差绝对值在5%~25%范围内,平均相对误差绝对值的平均值为9.8%;当参考粒径大于19.8μm时,颗粒粒径分布斜率为3.87±0.25,颗粒粒径分布模拟的平均相对误差绝对值在2%~10%范围内,平均相对误差绝对值的平均值为6.0%。误差分析表明:参考粒径取值大于19.8μm,幂律模型对颗粒粒径分布的模拟效果较好,最优参考粒径可选为122.0μm,此时模拟误差最小(平均相对误差绝对值的平均值为4.79%±1.78%)。
[Abstract]:In order to accurately describe the particle size distribution characteristics of suspended particles and to explore the high precision simulation of particle size distribution, this paper studied the power law model based on the field particle size data of Yellow Sea and Bohai Sea in November 2014. At the same time, the reference particle size, as an important parameter of the power law model, affects the slope of the power law model (the slope of particle size distribution) and the simulation accuracy. Therefore, the slope variation of power law model under different reference particle sizes and the simulation accuracy of the model are also analyzed. The results show that the slope of particle size distribution in the Yellow Sea and Bohai Sea is 0.46 ~ 7.53 (mean value: 4.09), and the slope of 84.2% is in the range of 3.2n4.5; When the reference particle size is less than 7.33 渭 m, the slope of particle size distribution changes greatly (mean value is 5.60 卤1.09 渭 m), the simulation error of particle size distribution is large, the mean relative error absolute value is in the range of 20 ~ 85%, the average relative error absolute value is 48.2%, and when the reference diameter is 7.33 ~ 19.8 渭 m, The slope of particle size distribution is 4.08 卤0.29. The mean relative error absolute value of particle size distribution simulation is in the range of 5%, and the average relative error absolute value is 9.8%, when the reference particle size is greater than 19.8 渭 m, The slope of particle size distribution is 3.87 卤0.25, and the average relative error absolute value of particle size distribution simulation is in the range of 2 ~ 10%. The average relative error absolute value is 6.00.The error analysis shows that the reference particle size is greater than 19.8 渭 m, and the power law model can simulate the particle size distribution better. The optimal reference particle size can be chosen as 122.0 渭 m, and the simulation error is the smallest (the average absolute value of the average relative error is 4.79% 卤1.78%).
【作者单位】：南京信息工程大学海洋科学学院;江苏省海洋环境探测工程技术研究中心;
【基金】：国家自然科学基金项目(41276186,41576172,41506200) 江苏省自然科学基金项目(BK20151526,BK20150914) 江苏省高校自然科学基金项目(15KJB170015) “全球变化与海气相互作用”专项(GASI03030101) 江苏省“青蓝工程”优秀青年骨干教师项目江苏高校优势学科建设工程资助项目(PAPD) 国家海洋公益性行业专项项目(201005030)~~
【分类号】：P734.2

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