Abstract : in this paper , we make a study on sampling interval revision of atmospheric diffusion parameter in concentration prediction of atmospheric environmental impact assessment 文摘:就大气环境影响评价浓度预测中,对大气扩散参数取样时间订正问题进行了说明和讨论。
To calculate the diffusion parameters in theory, the fick second law is used . the calculational results provide valid evidence for determining the nitriding time . the reason for which causes the difference between the real results and the theoretical calculation is analyzed 运用fick第二定律,从理论上计算了扩散参数,为确定氮化时间提供了依据,并对造成实际结果和理论计算之间差距的原因进行了分析。
2 ) from the analysis of the aerodynamic parameters and turbulent flux transfer under different synoptic conditions we achieve the conclusion that on sands raising and sandstorm days turbulent momentum and sensible-heat fluxes are important exchange factors in the boundary layer, with turbulent exchange stronger in sandstorm weather than both on fine and sand raising days . prior to the occurrence of such an event, in particular, the super-adiabatic instability in the near-surface boundary will reinforce sandstorm weather condition . 3 ) atmospheric turbulent diffusion parameters z and y have apparent daily variation 沙尘天气下以亲地壳元素为主的气溶胶元素浓度均高于背景大气和浮尘天气,而且沙尘天气强度愈强,元素浓度的增加愈显著;背景大气、浮尘天气条件下亲地壳元素的浓度一般在10~(-1)10~0gm~3量级,扬沙、沙尘暴时一般达10~1gm~3量级,特强沙尘暴时高达10~2gm~3量级。
After the batch tests, geotechnical characteristics of cation contaminated clay are studied . it is found that adsorbed cation can induce significant changes in the mechanical properties of clay . : to determine diffusion parameters of cations through clay, some laboratory tests are carried, out via horizontal and vertical diffusion tests 在粘土吸附性的基础上,对粘土吸附污染物离子后的基本土工特性(塑性、渗透性、强度等)进行试验研究,总结了粘性土在渗滤液的长期作用下其土工特性的变化趋势。
The contents of this paper include the following several aspects : ( 1 ) a model of the fractures leakage is built through counting and analyzing the wealthy geological records of hae field, and a model of the fracture water transporting is also built according to the fracture water condition of its recharge and its runoff and its discharge in hae field; ( 2 ) this paper studies the chemical behavior and the migration parameters of the elenent sr2 + in ground water in hae field, the main contents include : the presence form of the element sr in ground water is analyzed by way of the rmodynamics; the absorption mechanism that granite and sand stone absorbs sr element is analyzed based on theory and experiment test the diffusion parameters of the element sr in water and in granite and in sand stone are researched with laboratory experiment test; the partition coefficient of sand stone and granite to sr is tested by the batch way 其研究内容包括以下几个方面:(1)通过对我国hae预选处置场丰富地质资料的大量统计和分析,建立了该处置场的基岩裂隙渗透模型。再根据hae预选处置场基岩裂隙水的补给、径流、排泄条件及水位动态特征,建立了预选处置场基岩裂隙水水运动模型。(2)对高毒性锶元素在我国hae预选处置场地下水中的化学行为和迁移参数进行系统的研究,其中主要包括运用热力学方法分析了锶元素在地下水中的存在形态,利用理论分析与实验测试相结合的方法分析了花岗岩和砂岩对核素锶的吸附机制,采用室内实验装置研究了核素锶在地下水中的扩散参数以及在花岗岩和砂岩中的本征扩散参数,采用静态批式法研究了锶在砂岩和花岗岩中的分配系数。
Dilution and dispersion in constant horizontal flow and bottom multi-port discharging was studied in accordance with the hydraulic model test . the influence of diffusion parameters ( jet angle, jet velocity, number of nozzle, riser space ) and environmental parameters ( water depth, water velocity ) on dilution were analyzed . the experimental results show that environmental parameters have prominent effects on wastewater dilution and dispersion, in addition to that, diffuser design parameters have significant influence on wastewater dilution and dispersion . for bailonggang outfall zone, jet angel is 10 or so, nozzle number is 16 or so 借助于人工模型试验,分析了恒定横流底部多孔排放时扩散器设计参数(射流角度、射流速度、喷口个数)、上升管间距)及环境参数(环境水深、环境流速)对污水近区稀释扩散效果的影响,实验结果表明,除了环境条件对污水稀释扩散效果影响明显之外,扩散器设计参数对污水的近区稀释扩散也有显著的影响,针对白龙港排放口水域,喷口射流角度宜控制在10左右,喷口个数取16个