Numerical estimation of multiple leakage positions of a marine pollutant using the adjoint marginal sensitivity method
Numerical estimation of multiple leakage positions of a marine pollutant using the adjoint marginal sensitivity method
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DOI：
10.1016/j.compfluid.2021.105195
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发表时间：
2021-10
影响因子：
2.8
通讯作者：
Shunsuke Kanao;Toru Sato
中科院分区：
文献类型：
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作者：
Shunsuke Kanao;Toru Sato
当海洋中的污染物浓度异常高时，寻找污染物的泄漏位置和泄漏通量就显得非常重要。为了减少在海洋中的这种搜索工作的时间和费用，提出了一种数值方法，用于使用有限数量的观测浓度数据来估计泄漏位置及其通量。该方法被称为伴随边际灵敏度方法，其是用于估计泄漏位置和通量的时间向后概率方法。在这项研究中，我们改进的方法来处理多个泄漏位置，并验证了这种新开发的方法。此外，我们展示了成功估计的条件，通过改变流速，涡流扩散系数，两个泄漏位置之间的距离，空间观测范围，和传感器间距的一个精心策划的二维案例研究的模拟结果。此外，我们应用这种方法的三维情况下，真实的地形，并获得合理的可接受的结果，表明在二维案例研究中学到的知识是有效的。
When abnormally high concentration of a pollutant is observed in the ocean, it is very important to search for leakage positions and fluxes of the pollutant. To reduce time and expense of such search effort in the ocean, a numerical method was proposed for estimating a leakage position and its flux using a limited number of observed concentration data. This method is called the adjoint marginal sensitivity method, which is a time-backward probabilistic method to estimate a leakage position and a flux. In this study, we improved the method to deal with multiple leakage positions and validated this newly developed method. In addition, we showed the conditions for successful estimation using the simulation results of a well-planned two-dimensional case studies by changing flow velocity, eddy diffusion coefficient, distance between two leakage positions, spatial observation range, and sensor spacing. Moreover, we applied this method to a three-dimensional case with real topography and obtained reasonably acceptable results, suggesting that the knowledge learnt in the two-dimensional case studies is effective.