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71.
Loren P Conrad Milovan S. Beljin 《Journal of the American Water Resources Association》1996,32(6):1209-1220
ABSTRACT: Numerical models were used to examine the limitations of the assumptions used in an analytical induced infiltration model. The assumptions tested included negligible streambed effects, negligible areal recharge, two-dimensional ground water flow, fully penetrating rivers and wells, and constant surface water stage. For situations that deviate from the underlying assumptions, the analytical model becomes a less reliable predictor of induced infiltration. The numerical experiments show that streambed effects cannot be neglected if the streambed conductivity is more than one order of magnitude lower than the aquifer hydraulic conductivity. Areal recharge cannot be neglected if the ground water basin receives more than 5 in/yr of areal recharge. Three-dimensional flow effects due to well partial penetration cannot be neglected if the ratio of horizontal hydraulic conductivity to vertical hydraulic conductivity (Kh/Ku) is greater than 10. Surface water elevation fluctuations can significantly influence the induced infiltration rate, depending on the degree of fluctuations and the ground water hydraulic gradient. 相似文献
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Seasonal variations of Rn concentrations in the air of a tunnel located in Nagano city 总被引:2,自引:0,他引:2
H. Muramatsu Y. Tashiro N. Hasegawa C. Misawa M. Minami 《Journal of environmental radioactivity》2002,60(3):1070-274
The seasonal variation of 222Rn concentrations in the air of tunnels constructed during World War II at Nagano City has been investigated. The determination of 222Rn concentrations in tunnel air was performed using a solid-state nuclear track detector technique. The monthly radon concentrations changed smoothly, decreasing towards winter and increasing towards summer, and it was found that the concentrations strongly correlate with the temperature difference between the inside and the outside of the tunnel. In the innermost areas of the tunnel, the maximum concentration was observed in July, its value being about 6500 Bq m (-3). The concentrations of radon in the tunnel air decrease exponentially towards the openings of the tunnel, which indicates that the radon concentration in the tunnel is basically governed by diffusion and mixing of radon gas with air. These observations lead to the conclusion that the seasonal variation of the radon concentration in the tunnel air is mainly caused by a convection current due to a stack effect induced by the temperature difference between the tunnel air and the outside air. 相似文献
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安全生产标准是规范企业安全生产工作的基础性规范,是安全生产法律体系的重要组成部分,也是安全生产监管监察执法的重要依据。为掌握安全生产标准现状,收集、梳理了已发布的安全生产标准603项和正在研制阶段的标准385项,对标准发布年份、在研标准计划年份、标准领域分布、标准级别和标准性质多个维度进行分析,总结标准工作存在的问题,提出安全生产标准制(修)订及发展建议,为安全生产标准工作的持续完善提供参考。 相似文献
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引入流动电流这一重要电动化学参量,研究了在天然浑浊水中SC的基本模式,撮了SC与水中悬浮胶体颗凿表面电荷量及无机阳离子之间的理论关系,探讨了离子的浓度,性质,存在环境等对体系电动特性的影响,并对水中常见8种阳离子共存条件下的电动化学特性进行了实验分析,从而建立了无机阳离子对胶体的聚沉能力与电动响应特性之间的实际联系。 相似文献
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珠江三角洲经济区耕地锐减,水资源分布不均,工业和农业污染严重,农业生态环境日趋恶化。经济发展不平衡,农业趋于萎缩状态,本文针对这些问题,提出了珠江三角洲农业生态环境治理的指导思想、发展目标和基本措施。 相似文献
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利用衍生化气相色谱法对黄磷诱发氧化苯酚降解产物进行了研究,在磷酸存在下,以甲醇作酯类衍行生试剂,分别和SE-52和HP-17石英毛细管双柱结合GC-MS进行分离定性定量,黄磷诱发氧化苯酚降解产物以羧酸为主,在反应温度50℃时,表现为一级反应特征,速率常数(K):0.077min^-1,半衰期(t1/2):9.0min。 相似文献
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Past mining activities in the county of Cornwall in the United Kingdom, has exposed the local environment to raised levels of As. Previous research has shown an increased concentration of As in crops grown in such areas and the subsequent take-up of As through the food chain may lead to an increased body burden in man. In an attempt to evaluate this, a pilot study was carried out using Particle Induced X-ray Emission to compare the hair As concentration of a group of Cornish residents to that of a control group consisting of residents in the counties of Oxfordshire and Wiltshire. The null hypothesis being that there is no significant difference between the hair As concentrations of the two groups.Each group comprised thirty six age and sex matched subjects. The mean hair As concentration for the Cornish group was 2.51 g g-1, which is significantly greater than that of 0.7 g g-1 found in the control group (p = 0.004). The World Health Organisation suggests a hair As value greater than 1 g g-1 as evidence of increased exposure to As and 5 g g-1 is quoted by the Canadian Government as evidence of significant ingestion of As. Twenty one Cornish subjects registered a value at or above 1 g As g-1 compared to nine in the control group (p = 0.0003). Five subjects in the Cornish group had values that exceed 5 g As g-1, compared to only two in the control group (p = 0.23). We use the results of this study as evidence to support our continued work in this area in order to evaluate possible health implications. 相似文献