不同大气稳定度分类法及扩散参数方案对CALPUFF模拟结果的影响及拟合湍流方案的研究  

Effects of different atmospheric stability classification and diffusion parameter schemes on CALPUFF simulation results and a turbulence fitting scheme

作　　者：鲍昕杰 杨宗甄[1] 陶乃贵[1] 张晓峰[1] 王一川 BAO Xinjie;YANG Zongzhen;TAO Naigui;ZHANG Xiaofeng;WANG Yichuan(Suzhou Nuclear Power Research Institute,Jiangsu Suzhou 215004;Nuclear and Radiation Safety Center,MEE,Beijing 102445)

机构地区：[1]苏州热工研究院有限公司,江苏苏州215004 [2]生态环境部核与辐射安全中心,北京102445

出　　处：《辐射防护》2023年第2期145-154,共10页Radiation Protection

摘　　要：通过沿海某核电厂址在不同大气稳定度条件下开展的示踪试验,验证了CALPUFF模式中三种大气扩散参数方案在不同大气稳定度条件下的数值模拟效果。研究结果表明,实测湍流方案的模拟效果受大气稳定度分类结果的影响较小,综合评估结果最好。在模式模拟大气稳定度分类结果和基于气象塔实测数据的大气稳定度分类结果一致的条件下,微气象方案模拟结果略差于实测湍流方案模拟,好于PG方案。在环评重点关注的不利天气条件下,采用微气象方案或PG方案的模拟结果可能会与实际浓度分布结果有偏差。为了解决长期实测湍流数据不易获取的问题,将用于大气稳定度分类的气象塔实测数据及对应时段的湍流观测资料进行拟合,构造出各大气稳定度条件下湍流脉动标准差方程。统计结果表明,结合了大气稳定度指标的拟合湍流方案模拟效果良好,对于提高核电厂大气扩散模拟效果具有一定的实用意义。The numerical simulation results of three diffusion parameter schemes in CALPUFF model under different atmospheric stability conditions are verified by tracer tests at a coastal nuclear power plant site.The results show that the simulation effect of the measured turbulence scheme is less affected by the classification results of atmospheric stability,and the comprehensive evaluation result is the best.Under the condition that the classification results of atmospheric stability simulated by the model are consistent with those based on the measured data of the weather tower.And the simulation results of the micrometeorological scheme are slightly worse than that of the measured turbulence scheme,and are better than that of the PG scheme.Under the adverse weather conditions that the EIA focuses,the simulated results of the micrometeorological or PG scenarios may differ from the actual concentration distribution results.In order to solve the problem that it is difficult to obtain long-term measured turbulence data,the measured data of meteorological tower used for classification of atmospheric stability and the turbulence observation data of corresponding period were fitted,and the standard deviation equation of turbulence pulsation under various atmospheric stability conditions was constructed.The statistical results show that the fitting turbulence scheme combined with the atmospheric stability index has a good simulation effect,which has a certain practical significance for improving the atmospheric diffusion simulation effect for nuclear power plants.

关 键 词：CALPUFF 大气稳定度 示踪试验 大气扩散参数 湍流观测 

分 类 号：X169[环境科学与工程—环境科学]