济-菏高速公路建设对稻屯洼湿地的影响及保护措施研究

高速公路是经济发展的重要基础设施,修建高速公路,提高公路网的密度是社会经济发展的基础.然而,高速公路穿越湿地也造成了湿地面积的不断减少、湿地生态环境的严重破坏等问题.正在建设的济-菏高速公路穿越稻屯洼湿地,公路建设过程及建成运营后都会对稻屯洼湿地的生态环境产生影响.针对这一问题,文章介绍了济-菏高速和稻屯洼湿地的基本概况,分析了公路建设对湿地环境的影响,在此基础上提出了湿地生态环境的保护措施.     

高效垂直流人工湿地在景观湖水循环净化中的应用--以天津东丽湖景观湖水循环净化工程为例

介绍了天津东丽湖景观湖水循环净化工程的工艺流程、运行工况,并对处理效果及景观湖水质进行了分析,对人工湿地系统及景观湖泊的管理和维护进行了总结.通过近1a的运行实践表明高效垂直流人工湿地系统作为一种生态水处理技术,对微污染地表水净化具有良好的实用价值和应用前景.     

人工湿地污水处理技术及其发展现状

人工湿地与传统的污水处理法相比具有基建、运行费用低，操作与维护简单等优点。总结了人工湿地系统的研究现状和目前存在的问题，并指出了其未来的发展方向。     

薄板超塑性胀形的金属流动分析

分别在板厚均匀变薄和板厚呈线性规律变化两种假设的基础上 ,对薄板超塑性胀形过程中金属的变形规律及质点流动进行了分析 ,导出了变形前、后 ,质点点位的对应关系式 ,并与受内压薄壁球壳的均匀胀形作了比较     

Numerical simulation of stratified turbulent two phase flow in aquatic environment

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Turbulence Perturbations in the Neutrally Stratified Surface Layer due to the Interaction of a Katabatic Flow with a Steep Ridge

Turbulence measurements were performed in Antarctica, on the Nansen Ice Sheet, dominated by westerly katabatic winds. The measurements were taken at two sites aligned with the katabatic wind fall-line. The measuring stations were located in the middle of a wide, flat iced area at a distance of 14 km from the base of a sloping surface and at the top of a steep ridge (Inexpressible Island). The aim was to investigate the perturbation of turbulence close to the ground generated by the interaction of the flow with the ridge. We present an analysis comparing the data measured at the upstream unperturbed station with those at the top of the obstacle. Moments and spectra of velocity components have been calculated for almost steady periods. The topography and roughness change produce a combined effect on the flow acceleration (of the opposite sign) and on the turbulent stresses (of the same sign). Spectra of velocity components measured at the top of the ridge and scaled by unperturbed quantities evidence an increment of energy in the high frequency subrange with respect to the up-stream flow. Moreover, the horizontal velocity components display a shift in turbulence maximum towards higher frequencies. The vertical velocity spectrum exhibits an energy increment at low frequencies with respect to the upstream spectrum.     

向海湿地贴地气层中CO2日平均浓度空间分异特征

研究了向海湿地贴地气层中CO2浓度8月份的日平均值在水平方向及垂直方向上的空间分异特征.结果表明,向海湿地贴地气层CO2日平均浓度在246~266mol/mol之间,低于三江平原湿地贴地气层乃至全球CO2浓度值,4个高度(0.1,0.6,1.2,2m)水平方向纬度分异显著,变异显著区基本一致;垂直分异差异显著,芦苇和香蒲湿地变异最大,岸边坡地变异最小.     

A numerical method for spherical particle motion in turbulent flow with large Reynolds number

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云南湿地的现状和保护对策

阐述了云南湿地资源现状;对湿地的盲目开垦和改造、生物资源过度利用、水资源不合理利用、污染加剧和泥沙淤积等问题,提出了相应的保护措施.     

Characterization of aliphatic hydrocarbons in deep subsurface soils near the outskirts of Beijing, China

Thirty-nine deep subsurface soils( 150—180 cm depth) near the outskirts of Beijing were investagated. The concentrations including n-alkanes from C13 to C36, pristane and phytane were in the range of 0.60 to 170.10μg/g, with a median value of 4.26. Carbon preference index values for n-alkanes ranged from 1.08 to 2.98, with a median value of 1.48. The percentage contribution of “wax” nalkanes was in the range of 6.03%--46.22%. A predominance of odd/even carbon n-alkanes and unresolved complex mixtures with different shapes and ranges were frequently observed. Factor analysis reduced the data set into three principal components and confirming contributions from low ( 19.58% ), medium ( 20.49% ) molecular weight species and long-chain n-alkanes (43.41% ), respectively.Molecular biomarkers such as pristane, phytane, hopanes and steranes were detected. Based on the principal component analysis, the concentration profiles and molecular markers, it was found that the aliphatic hydrocarbons were from both biogenic and anthropogenic sources.