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《四川环境》2017,(Z1)
使用《环境影响评价技术导则大气环境》(HJ2.2-2008)推荐的大气环境影响预测模式(AERMOD和CALPUFF)对某一复杂地形区域高架烟囟排放的放射性核素进行了大气扩散模拟的对比研究。模拟结果表明:在研究时段内,AERMOD计算出的平均落地浓度最大值高于CALPUFF;计算出的最大小时落地浓度和最大日均落地浓度也均高于CALPUFF计算出的相应值。对复杂地形条件下的高架烟囟释放,AERMOD出现最大小时落地浓度的时刻不一定是风速较低的时刻,而是对应下风向附近有高海拔受体、且风速适中、污染物易通过风的平流输送在高海拔受体处形成撞山高浓度的时刻;CALPUFF出现最大小时落地浓度的时刻一般是排放口和地表风速较低、且大气又极不稳定、垂直方向湍流剧烈的时刻。对复杂地形条件下的放射性核素大气扩散模拟,相对于AERMOD模式,CALPUFF模式可模拟生成更加真实的气象场、采用了烟团扩散模式而更具优势。 相似文献
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村庄生活污水治理工程是近年来乡村振兴和环保整治的重点。针对村庄生活污水治理工程中范围广、地形复杂、隐蔽工程多等特点,通过BIM+GIS技术在全生命周期过程中的应用,使村庄生活污水治理工程各阶段的数据不再孤立,在工程各阶段有序传递、共享和集成,实现真正意义上的工程项目的 BIM全生命周期管理;整个项目在设计、施工及运维等阶段都能够有效地依据BIM模型建立完善的资源计划、控制资金风险、节约成本和提高工作效率。 相似文献
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城镇化是推动我国经济社会发展的重要动力,在高速发展的同时,带来大量污染排放,威胁乡村环境质量与可持续发展。在对乡村生态环境问题剖析的基础上,从战略、实施、方式等层面探索解决思路,围绕科学规划、发展方式、基础建设、管理机制、宣传教育等方面分析关键点,加强乡村环境保护,保障城镇化建设健康发展,为促进农村农业持续发展提供持久动力。 相似文献
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Trametes versicolor decolorized 2000 mg L(-1) of the mono-azo substituted naphthalenic dye Amaranth with no dye sorption observed visually. The changes in the toxicity were assessed over a period of 30 d for the dye-treated viable culture, control (no dye added), and a boiled culture treated with dye, using the Microtox Acute Toxicity assay. Before dye addition, the culture filtrate had some toxicity, which increased after the dye addition. The toxicity of the dye-treated culture decreased during the treatment. The loss of toxicity occurred at the same time, with the loss of color suggesting that detoxification is associated with decoloration. The change in pH was due to natural metabolic processes and had a small effect on detoxification. Because the toxicity of the treatment was similar to that of the control at the end of the treatment, the effluent seems to be safe for release into the environment, potentially rendering this treatment suitable for industrial application. 相似文献
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泵站树状给水管网流量具有随机性,而这种随机性变化会直接影响管网的建设费用和动力费用.针对这-特点,应用随机规划原理,建立泵站树状给水管网机会约束模型,编写基于随机模拟的遗传算法程序求解该模型.机会约束模型能较客观地反映该管网的实际工况,使优化设计结果更符合实际. 相似文献
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Günay Kocasoy 《Environmental management》1989,13(4):469-475
The increase in the number of tourists visiting a coast is desired by most of the countries for economic reasons. However, this increase in tourism may cause pollution of the sea. This can be only avoided by proper planning and by predicting the carrying capacity of the coast in terms of sea pollution. This is especially important for developing countries where part of the wastewater is discharged without any treatment into the sea.In the present study the beaches were classified according to their use — and consequently the amount of waste discharged into the sea — into four groups: (1) coasts that are used only for swimming and recreational purposes; (2) coasts used simultaneously for dwelling, swimming, and recreational purposes; (3) coasts along which only dwellings exist; and (4) natural and man-made harbors, i.e., coasts used as shelters. During the survey,40,320 observations were made between December 1985 and February 1988 to determine the effect of the number of tourists on seawater quality. The results obtained were analyzed by a multilinear regression program to obtain an empirical equation giving the extent of the sea pollution in terms of coliform concentration as a function of population density and some other environmental factors.The equations derived in this study enable the determination of the carrying capacity of a beach in terms of pollution as well as the expected degree of pollution corresponding to a given population density. Furthermore, it allows the prediction of the extra carrying capacity that can be obtained by improving the waste-disposal conditions. 相似文献
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阐释了信息产业专门化街区的内涵,结合对合肥市黄山路信息产业专门化街区构成要素的分类及其邻近度的分析,分别从空间结构演化、景观演化、功能演化三方面阐述了合肥市黄山路由"电子一条街"向"信息产业专门化街区"的总体演化阶段,探讨了信息产业专门化街区的未来发展趋势。 相似文献
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