多介质迁移转化逸度模型的建立及软件实现
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摘要
气候变化和环境问题的全球化促使各国政府及科研机构致力于环境污染物的宏观环境行为研究,应用数学模型以及计算机软件技术模拟污染物在环境系统中的分布与归宿具有传统实验方法无可比拟的优越性,由此使得环境归趋研究的数字化得以形成并具有良好的发展前景。
     在众多研究污染物的宏观环境行为的环境模型中,应用较多的是加拿大特伦特大学环境模型研究中心的Donald Mackay教授提出的逸度模型。本文针对有机污染物的污染问题,采用环境归宿模拟技术中的热点模型——多介质迁移转化逸度模型,提出了在环境六相中,优化的传质系数。并结合计算机软件技术,对有机污染物在环境不同介质中的迁移转化和归趋过程进行模拟,定量表征污染物的时空变化规律,并有针对性的提出了两点未来研究建议。
     本文采用多介质环境逸度模型作为原型,针对所研究的具体问题,比较全面地考虑了有机污染物在所研究环境系统中的迁移、转化过程之后,开发出面向区域环境和有机污染物的动态多介质环境逸度模型,优化了多介质环境逸度模型中的部分内定参数,采用四阶Runge-Kutta的数值解法获得了高精度、收敛性好、稳定性高的模拟结果,并用软件实现模拟平台。
     模拟平台采用Microsoft Visual Basic 6.0与Microsoft SQL Server 2000作为开发工具,开发出简洁、方便用户操作的应用系统平台。模拟过程中可进行灵敏度分析,方便筛选出影响因子较大的参数;系统运行过程的初始输入、中间结果、模拟结果等均以文件的形式输出,方便作其他方面的研究。
     针对不同的区域环境和不同的有机污染物,结合相应的环境信息资料和污染物信息资料,模拟结果即可为模拟区域有机污染物的潜在风险评价提供参考依据。
The climate changing and the globalization of environment question urges various governments and scientific institutes devote to the research of macroscopic environment behavior of environment pollutants, using mathematics model as well as the computer software technology to simulate pollutants’distribution and fate in environment has the incomparable superiority which traditional experimental technique hasn’t. The above two reasons will form the tendency of the fate research digitization, which will obtain the profound development in the end.
     Of many macroscopic environmental behavior models for pollutants researching, the fugacity model has been widely used, proposed by Professor Donald Mackay from environment model study center of Canada Trent University. In view of the question of pollution of organic pollutants, the environment end-result simulating system of regional environment’s organic pollutants oriented is studied and developed in this paper, which uses the hot spot model of the environment end-result simulating technology——multi- medium fugacity model and the computer software technology, which can simulate organic pollutants’fate in the different mediums and quota attribute the special and temporal changing regulations of fugacity, concentration and quality in the environment multi- mediums.
     This paper uses the multi- medium environment fugacity model to take the prototype, in view of concrete question which is studied, comprehensively considering the environmental behaviors of organic pollutants, then the environment end-result simulating system of regional environment’s organic pollutants oriented is studied and developed, which optimizes some parameter in the multi- medium environment fugacity model and uses the value solution of four steps Runge-Kutta to obtain the simulating result which has high accuracy, good astringency and high stability.
     The stimulating platform uses Microsoft Visual Basic 6.0 and Microsoft SQL Server 2000 as the developing platform to research and develop the convenient desktop application system. The simulating process sector analysis conveniently screens the big influent factor parameters. The system’s initial input, intermediate results, ending result may be produced as a report, which is separated from the system and can be used alone, so that users can conveniently makes other research outside the system.
     According to the different regional environments, the analogue result can provide an effective approach for the latent risk assessment on the regional organic pollutants, when the corresponding regional environmental information is considered.
引文
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