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81.
通过用重量法测定水中油类物质的几个影响因素的研究,得出了能够取得满意测定结果的方法.改进后的方法,减轻了工作量,节省了分析费用,有利于批量分析. 相似文献
82.
对目前使用较为常见的pH预测模式和方法进行了分析探讨,提出了各自的适用和范围和存在问题,并提出了比较合理的pH值预测模式和方法. 相似文献
83.
从飞机炮击环境的特性出发,指出GJB150.20-86窄带随机加宽带随机飞机炮振试验方法的局限性以及应用傅立叶分析方法分析炮击信号的不合理性,提出应用时-频联合分析方法进行炮击信号分析的可行性以及小波(Wavelet)分析技术用于炮击信号中确定性信号和非平稳随机信号分离的应用途径。最后,提出适用实验室炮击环境模拟的脉冲方法(Pulse Method)数学模型。 相似文献
84.
利用星座图法进行大气质量评价,优化了路径权值的算法,得出的星座图在两维颊内具有同样模式距离接近和不同模式距拉开的特点。 相似文献
85.
从韦伯—费希纳定律S=KlogR出发,指出在大气污染物背景浓度限值Cioo至明显危害浓度限值CI∞范围内,当污染物浓度成等比变化时,人对污染物浓度刺激量的主观差别感觉成等差变化。应用"等差分级、等比赋值"的指数标度法计算出6种大气污染物的三级标准浓度限值与我国制定的《大气环境质量标准》,GB3095-82规定的污染物日平均浓度限值基本接近,为我国《大气环境质量标准》提供了合理依据。 相似文献
86.
Development and Testing of a Physically Based Model of Streambank Erosion for Coupling with a Basin‐Scale Hydrologic Model SWAT
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B. Narasimhan P.M. Allen S.V. Coffman J.G. Arnold R. Srinivasan 《Journal of the American Water Resources Association》2017,53(2):344-364
A comprehensive streambank erosion model based on excess shear stress has been developed and incorporated in the hydrological model Soil and Water Assessment Tool (SWAT). It takes into account processes such as weathering, vegetative cover, and channel meanders to adjust critical and effective stresses while estimating bank erosion. The streambank erosion model was tested for performance in the Cedar Creek watershed in north‐central Texas where streambank erosion rates are high. A Rapid Geomorphic field assessment (RAP‐M) of the Cedar Creek watershed was done adopting techniques developed by the Natural Resources Conservation Service (NRCS), and the stream segments were categorized into various severity classes. Based on the RAP‐M field assessment, erosion pin sites were established at seven locations within the severely eroding streambanks of the watershed. A Monte Carlo simulation was carried out to assess the sensitivity of different parameters that control streambank erosion such as critical shear stress, erodibility, weathering depth, and weathering duration. The sensitive parameters were adjusted and the model was calibrated based on the bank erosion severity category identified by the RAP‐M field assessment. The average observed erosion rates were in the range 25‐367 mm year?1. The SWAT model was able to reasonably predict the bank erosion rates within the range of variability observed in the field (R2 = 0.90; E = 0.78). Editor's note : This paper is part of the featured series on SWAT Applications for Emerging Hydrologic and Water Quality Challenges. See the February 2017 issue for the introduction and background to the series. 相似文献
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M. Konz A. Younes P. Ackerer M. Fahs P. Huggenberger E. Zechner 《Journal of contaminant hydrology》2009,108(3-4):168-175
Konz, M., Ackerer, P., Younes, A., Huggenberger, P., Zechner, E., 2009a. 2D Stable Layered Laboratory-scale Experiments for Testing Density-coupled Flow Models. Water Resources Research, 45. doi:10.1029/2008WR007118., a series of laboratory-scale 2D tank experiments were conducted and accurately simulated for density driven flow problems on homogeneous porous media. In the present work, we extended the numerical and experimental studies to heterogeneous problems. The heterogeneous porous medium was constructed with a low permeability zone in the centre of the tank and had well-defined parameters and boundary conditions. Concentration distributions were measured in high resolution using a photometric method and an image analysis technique. The numerical model used for the simulations was based on efficient advanced approximations for both spatial and temporal discretizations. The Method Of Lines (MOL) was used to allow higher-order temporal discretization. Three different boundary conditions, corresponding to different localizations of the inflow and the outflow openings at the opposite edges of the tank, were applied to investigate different flow scenarios in the heterogeneous porous medium flow tank. Simulation results of all three density coupled experiments revealed a density-dependent behavior of dispersion. Thus, a reduction of dispersivites was required to obtain a good matching of the experimental data. The high quality of the experiments enabled a detailed testing of numerical variable-density flow codes under heterogeneous conditions. Therefore, the experiments were considered to be reliable benchmark tests. 相似文献
90.
河流水环境质量综合评价方法比较研究 总被引:12,自引:0,他引:12
提出了对河流水环境质量综合评价方法的基本要求,对水环境质量评价方法的现状进行了研究,并通过对各种方法的 比较,探讨了今后水环境质量综合评价方法的发展方向。 相似文献