东海悬沙浓度垂向分布规律研究

IOCAS-IR > 海洋环流与波动重点实验室

	东海悬沙浓度垂向分布规律研究
其他题名	A study of vertical distribution's rule of suspended sediment concentration in the East China Seas
	刘咪咪
学位类型	博士
	2008-06-12
学位授予单位	中国科学院海洋研究所
学位授予地点	海洋研究所
关键词	悬沙浓度准调和分析潮流垂向分布相关分析线性回归模型细颗粒泥沙悬移特性
摘要	细颗粒泥沙运动及冲淤变化在深水航道整治工程中至关重要，研究细颗粒悬沙运动，悬沙浓度是一个关键。研究悬沙浓度，首先要研究悬沙浓度的水平和垂向分布，其中，垂向浓度又是海水中悬沙三维分布研究的核心。本文以2006年8月的长江口外海域的悬沙数据资料为基础，把经典的泥沙扩散理论模型和两相流颗粒浓度分布的运动理论模型的关于垂向含沙分布的理论，作为本研究的回归模型的理论依据，通过观测获得的悬沙浊度资料对应求出观测垂向剖面浓度，采用相关分析和多元线性回归的方法，分析了长江口外海域的悬沙浓度垂向分布特点，回归出悬沙垂向浓度分布模型，为了更好的揭示水动力条件对浅海陆架区悬浮物的影响，本文还用短期资料的潮流准调和分析方法，对东海三定点分表中底三层的25小时连续海流资料进行分析，计算了三测站六个主要分潮的北、东分量潮流调和常数，由于原始记录带有扰动信息，经过预处理计算出来常规每小时一次的海流观测结果，把海流加入了悬沙垂向分布模型。并在整个研究区域验证了悬沙垂向浓度分布模型。结果表明：垂向浓度的大小与相对水深相关性良好，而水深对其的影响则表现在梯度变化方面。通过悬沙垂向浓度模型，由海水底层浓度和海流可以计算得到不同水层的悬沙浓度；有效性检验和拟合结果检验表明，该模型置信度较高，且能够较为有效的预测海水中、上层水体的悬沙浓度值。
其他摘要	The movement of silty fine sand and the variety of the erosion and deposition are very important factor in the project of deep navigable channel regulation.The research of silty fine sand movement and suspended sediment concentration (SSC) is the key. AS to researching the SSC, the first step is the research of horizontal and vertical distribution. Meanwhile, vertical concentration is the core of research of suspended sediment three-dimensional distribution in seawater. Based on the observation data of SSC collected in the areas adjacent to Changjiang River Estuary in August, 2006. This paper takes the classical theoretical diffusion model and the microscopic kinetic theoretical model for dilute solid-liquid two-phase flows as the theoretical foundation. This paper statistically analyzed the features of vertical distribution of SSC in the sea water in the areas adjacent to Changjiang River Estuary, and established some linear regression models of vertical distribution of SSC adapting to this sea area on the basis of correlation analysis. In order to better reveal the effect of the hydrodanamic condition to shallow water shelf area of suspended sediment, this paper uses the tidal current quasi-harmonic method for short-term data to analyze the tidal current characteristics at three stations anchored in the East Sea.The harmonic component in North and East of 6 tidal constituents are calculated. Because of the turbulent information in the original records, we calculate the current regular hourly observations after pretreatment, and join the current data into the regression models. Throughout the study and verified suspension of the regional concentration of vertical distribution model.The conclusions are as following: The relative water depth is the main factor which closely affects the magnitude of SSC.As the bottom SSC and the currunt are known, the SSC at different depth layer can be calculated by using regression models. The validation tests of these models show high confidence score and the estimated values of SSC indicated that these models are more reliable and accurate when predicting the SSC in the upper and intermediate layers.
页数	61
语种	中文
文献类型	学位论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/827
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	刘咪咪. 东海悬沙浓度垂向分布规律研究[D]. 海洋研究所. 中国科学院海洋研究所,2008.

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