水下污染源分布模型输入参数的变分辨识

IF 0.7 Q4 OCEANOGRAPHY Physical Oceanography Pub Date : 2019-12-01 DOI:10.22449/0233-7584-2019-6-621-632
S. Kochergin, V. Fomin
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引用次数: 0

摘要

意图本文的目的是构建和验证确定水下水源出口污染物浓度和水流速度的变分程序,并分析算法对测量数据中随机噪声水平的敏感性。方法和结果。采用三维斜压σ坐标水循环模型计算了流场。污染转移模型的实现包括TVD型单调方案的应用。温度和盐度的初始剖面是根据水下释放区域的探测结果预先设定的,并且使用ADCP测量数据定义了回流的特征速度。通过最小化二次函数的迭代过程来识别问题的输入参数。对水下污染源参数识别的数值实验表明,如果不考虑噪声,可以重建原始参数,相对误差<1%。结果表明,如果来自测量方案的更多信息点的数据被同化,则识别问题具有更好的条件性。结论。在数值实验分析的基础上,证明了线性化算法能够识别水下声源的参数。所提出的算法可用于解决一系列环境问题,也可用于解释和规划旨在研究沿海水域废水分布的现场实验。
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Variational Identification of Input Parameters in the Model of Distribution of the Pollutants from the Underwater Source
Purpose. The aim of the paper is to construct and to validate the variational procedure for determining the pollutant concentration and the water flow out velocity at the underwater source exit, as well as to analyze the algorithm sensitivity to the level of random noise in the measurement data. Methods and Results. The flow field was calculated using the three-dimensional baroclinic σ-coordinate model of water circulation. Realization of the pollution transfer model included application of the TVD-type monotone schemes. The temperature and salinity initial profiles were preset based on the results of probing in the area of the underwater release, and the characteristic velocity of the back-ground currents was defined using the data of the ADCP-measurements. The input parameters of the problem were identified by means of the iterative procedure for minimizing the quadratic functional. The numerical experiments on identifying parameters of the underwater pollution source showed that if noise was left out of account, the original parameters were reconstructed with a relative error < 1%. It is shown that the identification problem becomes of better conditionality in case the data from more informative points of the measurement scheme are assimilated. Conclusions. Based on the analysis of the numerical experiments, the linearization algorithm is shown to be able to identify the parameters of the underwater source. The proposed algorithms can be used to solve a wide class of environmental problems, as well as to interpret and to plan the field experiments aimed at studying the wastewater distribution in the coastal waters.
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来源期刊
Physical Oceanography
Physical Oceanography OCEANOGRAPHY-
CiteScore
1.80
自引率
25.00%
发文量
8
审稿时长
24 weeks
期刊最新文献
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