Adaptive center constraint for joint release rate estimation and model correction: Multi-scenario validation against wind tunnel experiments

IF 3.3 3区 工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY
Xinpeng Li , Jiayue Song , Yujie Zhang , Li Yang , Sheng Fang
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引用次数: 0

Abstract

Release rate estimation is crucial for the consequence assessment and emergency decision-making in nuclear accidents. However, inevitable model biases can lead to significant deviations. This study proposes an Adaptive Center Constraint for joint release rate estimation and model correction (ACC joint) for improved robustness and accuracy. It uses a tailored cost function to determine the optimal center constraint, which can automatically adapt to different cases. It was validated against four wind tunnel experiments, which simulated complex dispersion scenarios with densely built-up and highly heterogeneous terrains. The ACC joint method was compared with the Tikhonov and joint correction. The results indicate that the proposed method significantly improves the accuracy of release rate estimation. Compared to the joint correction method, the mean relative error is reduced by 38.6% and 31.4% in the all-measurement and independent validation, respectively. Furthermore, sensitivity analysis reveals that the ACC joint method provides lower mean relative error with different numbers of measurements and shows ultimate stability in all scenarios. It also suggests that measurement sites should be positioned in downwind high-concentration areas and the foot of mountainous areas for reliable estimation. The results from different cost functions verify the scalability of the proposed method, providing potential applications to other complex scenarios.

用于联合释放率估算和模型修正的自适应中心约束:根据风洞试验进行多场景验证
释放率估算对于核事故的后果评估和应急决策至关重要。然而,不可避免的模型偏差会导致重大偏差。本研究提出了一种用于联合释放率估计和模型修正的自适应中心约束(ACC joint),以提高鲁棒性和准确性。它使用定制的成本函数来确定最佳中心约束,可自动适应不同情况。四次风洞实验对该方法进行了验证,这些实验模拟了建筑密集和高度异质地形的复杂扩散场景。ACC 联合法与 Tikhonov 法和联合修正法进行了比较。结果表明,所提出的方法大大提高了释放率估算的准确性。与联合修正法相比,在全测量和独立验证中,平均相对误差分别减少了 38.6% 和 31.4%。此外,敏感性分析表明,ACC 联合方法在不同测量次数下的平均相对误差较低,并且在所有情况下都表现出最终稳定性。这也表明,为了进行可靠的估算,测量点应设在下风高浓度地区和山脚下。不同成本函数的结果验证了所提方法的可扩展性,为其他复杂场景的应用提供了可能。
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来源期刊
Progress in Nuclear Energy
Progress in Nuclear Energy 工程技术-核科学技术
CiteScore
5.30
自引率
14.80%
发文量
331
审稿时长
3.5 months
期刊介绍: Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.
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