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Distribution and health risk assessment of organochlorine pesticides(OCPs) in industrial site soils:A case study of urban renewal in beijing,china

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Journal of environmental Sciences 2009年第3期21卷 366-372页

作者： YANG Wenrui,WANG Rusong,ZHOU Chuanbin,LI Fengstate key {2. of Urban and Regional Ecology,Research Center for Eco-environmental Sciences,Chinese Academy of Sciences,beijing 100085,china. [a]state key {2. of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

A field survey was conducted in a contaminated industrial site of southern beijing, china to investigate the contents and distribution of the organochlorine pesticides （α-, β-, y-, δ-HCH, p,p＇-DDT, p,p＇-DDE, p,p＇-DDD and o,p＇-DDT） in the profiles of soil, and a health risk assessment was carded out with CalTOX multimedia exposure model. Results showed that mean concentrations of total hexachlorocyclohexane isomers （HCHs） and total dichlorodiphenyltrichloroethane isomers （DDXs） in soils were in the range of 13.2.- 148.71 mg/kg, and 3.02.67.43 mg/kg, respectively. Organochlorine pesticides （OCPs） content peaked in the surface and declined in soil profile with depth. The amounts of HCHs in three profiles of soil were larger than DDXs. Composition analysis indicated that there was a trend of degradation of OCPs in the site, but the mean of HCHs and DDXs concentration were over the {2. warning standard limit （HCHs, 0.50 mg/kg; DDXs, 0.50 mg/kg）. According to current land use development, health risk assessment with CalTOX and Monte Carlo analysis showed that health risks mainly came from two exposure pathways： dermal uptake and inhalation, and the total risk values all exceeded the general acceptable health risk value （10-6）. The sensitivity analysis indicated that five parameters significantly contributed to total risk.

关键词： pollution hexachlorocyclohexane isomers (HCHs) dichlorodiphenyltrichloroethane isomers (DDXs) soil profiles Monte Carlo sensitivity

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Retrospect and prospect of watershed hydrological model

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Communications in Nonlinear Science and Numerical simulation 2001年第3期6卷 172-177页

作者： B. CHEN, L. Z. XIA, Z. F. YANG and G. Q. CHEN state key {2. for Studies of Turbulence and Complex Systems / Center for environmental Sciences, Peking University, beijing 100871, china Institute of environmental Sciences, beijing Normal Universitg, state key Lab. Studs. T./C.S. Center for Environmental Sciences Peking University Beijing 100871 China Institute of environmental Sciences Beijing Normal University Beijing 100875 China

A brief review is presented of the development of watershed hydrological models. Conventional Hydrological Model, Grey Hydrological Model, Digital Hydrological Model and Intelligent Hydrological Model are analyzed. The frameworks of Fuzzy Cognitive Hydrological Model and Integrated Digital Watershed Hydrological Model are presented.

关键词： watershed hydrological model digital watershed complex system

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WATER QUALITY MODELING OF SUZHOU CREEK

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Journal of Hydrodynamics 2002年第2期14卷 83-90页

作者： Xu Zu-xin, Liao Zhen-liang pollution control and Resource Reuse {2. key laboratory, Tongji University, Shanghai 2.0092. china Liu Dong-sheng Shanghai environmental Information Center, Shanghai 2.0050, china pollution control and Resource Reuse {2. key laboratory Tongji University Shanghai 200092 China Shanghai environmental Information Center Shanghai 200050 China

Water-quality models are important tools for improving river environment. In this paper, the project 'Water Quality Modeling of the Suzhou Creek' was briefly described, including the choice and the principle of the model, the model study and methods, the calibration and verification of the stream model. A set of parameters about water environmental characteristic of the Suzhou Creek were put forward in the period of the third water dispatch experiment in 1999. It is necessary to point out that these parameters will change with the rehabilitation and construction of the Suzhou Creek.

关键词： water quality mathematical model Suzhou Creek

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Formation and causes of NOx pollution on the east side of the Taihang Mountains in china

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Science Bulletin 2011年第19期 2046-2051页

作者： TIAN HeZhong 1 , WANG Yan 1 , ZHAO Dan 1 , CHAI FaHe 2., XING ZiShan 3 & CHENG Ke 1 1 state key {2. laboratory of environmental simulation & pollution control, School of Environment, beijing Normal University, beijing 100875, china 2.Chinese Research Academy of environmental Sciences, beijing 100012. china 3 School of Computer Science and Technology, beijing University of Posts and Telecommunications, beijing 100876, china

Tropospheric column amounts of NO 2.from OMI/Aura products were applied to investigate the seasonal variation of NO x on the east side of the Taihang Mountains (ESTM) in china. The NO 2.concentration varied seasonally, with winter maxima and summer minima. To explore the causes of the heavy NO 2.pollution in this region, wind field {2.s were conducted by using the Fifth-Generation NCAR/Penn state Mesoscale Model (MM5). MM5 {2.s showed that wind directions in the ESTM region were dominated by northeasterly and northwesterly winds throughout the year and to a lesser degree by southwesterlies. Elevated NO 2.concentrations (higher than 50×10 15 molec/cm 2.) occurred in three meteorological situations: convergent wind fields (5 days), northeasterly winds (2.days), and calm days (1 day) in January. Although the local anthropogenic NO x emission strength was not so high as that in other developed areas, the calms and frequent occurrence of convergent wind fields, as well as unfavorable terrains for diffusion, resulted in the accumulation of atmospheric pollutants and hence heavy NO x pollution. Furthermore, long-distance NO x transportation from the beijing-Tianjin-Tangshan region to the ESTM area could be seen when the wind was from a northeasterly direction, especially under high wind speeds.

关键词： east side of the Taihang Mountains (ESTM) remote sensing of air pollution satellite data tropospheric NO 2 pollution wind field china

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灰关联分析方法用于指标体系的筛选

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数学的实践与认识 2002年第5期32卷 728-732页

作者：沈珍瑶杨志峰北京师范大学环境科学研究所环境模拟与污染控制国家重点联合实验室北京100875

灰关联分析方法作为一种在指标体系筛选中应用的定量方法 ,实际应用时应注意以下问题 :1要谨慎选择作为母序列的指标 ;2.考虑与总体目标的关系 ,当子序列与总体目标的关系和母序列与总体目标的关系不相一致时 ,在无量纲处理时应采用不... 详细信息

灰关联分析方法作为一种在指标体系筛选中应用的定量方法 ,实际应用时应注意以下问题 :1要谨慎选择作为母序列的指标 ;2.考虑与总体目标的关系 ,当子序列与总体目标的关系和母序列与总体目标的关系不相一致时 ,在无量纲处理时应采用不同的方法 ;3最好结合其他定量分析方法与定性分析方法来综合筛选指标体系 .文中结合黄河流域水资源可再生性评价指标体系的筛选工作。

关键词：灰关联分析方法指标体系筛选黄河水资源

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Analytical method of Cr stable isotope and its application to water pollution survey

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Chinese Science Bulletin 2010年第7期55卷 664-669页

High Cr(VI) concentration is a potential serious risk to environment and ecologic ***,it is essential to effectively monitor Cr contamination in water systems and scientifically evaluate its evolution trend.A new method of in-situ tracer technique by Cr isotopic analysis for quantitatively estimating Cr-contamination and its regional evolution in natural waters as well as a case application are reported in this *** on documented literatures,an experimental procedure for chemical separation and purification of Cr in water samples and its analytical method for Cr isotopic measurement by thermal ionization mass spectrometry(TIMS) are *** samples collected around a chemical factory in Hubei Province were analyzed by this *** samples showδ53Cr values ranging from-1.7‰to 7.3‰and an elevating trend with an increasing in distance from the sampling site to pollution source.A functional correlation following Rayleigh fractionation law was established between sample'sδ53Cr value and its extent of Cr *** study suggests that Cr isotopic analysis is an effective method to reveal the spatial distribution and its evolution trend of Cr contamination in the regional water *** is thus helpful to assessing the self-purifying ability of local water system according to Cr isotopic fractionation.

关键词：铬(VI) 水污染调查稳定同位素应用同位素分析供水系统演变趋势示踪技术

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Modeling of Hillslope Runoff and Soil Erosion at Rainfall Events Using Cellular Automata Approach

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Pedosphere 2009年第6期19卷 711-718页

作者： MA Ting ZHOU Cheng-Hu CAI Qiang-Guo state key {2. of Resources and environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 (China) Graduate University of the Chinese Academy of Sciences Beijing 100049 (China)

A novel quantitative cellular automata (CA) model that simulates and predicts hillslope runoff and soil erosion caused by rainfall events was developed by integrating the local interaction rules and the hillslope surface hydraulic processes. In this CA model, the hillslope surface was subdivided into a series of discrete spatial cells with the same geometric features. At each time step, water and sediment were transported between two adjacent spatial cells. The flow direction was determined by a combination of water surface slope and stochastic assignment. The amounts of interchanged water and sediment were computed using the Chezy-Manning formula and the empirical sediment transport equation. The water and sediment discharged from the open boundary cells were considered as the runoff and the sediment yields over the entire hillslope surface. Two hillslope soil erosion experiments under simulated rainfall events were carried out. Cumulative runoff and sediment yields were measured, respectively. Then, the CA model was applied to simulate the water and soil erosion for these two experiments. Analysis of simulation results indicated that the size of the spatial cell, hydraulic parameters, and the setting of time step and iteration times had a large impact on the model accuracy. The comparison of the simulated and measured data suggested that the CA model was an applicable alternate for simulating the hillslope water flow and soil erosion.

关键词： hillslope surface hydraulic parameters sediment simulation water

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多孔介质不溶混流体毛细压力与饱和度关系实验研究

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水动力学研究与进展（A辑） 2005年第5期20卷 665-672页

作者：郑冰陈家军尉斌支银芳北京师范大学环境学院环境模拟与污染控制重点联合实验室北京100875

采用根据张力计原理设计的简易装置实验测定多孔介质湿润相被单调驱替过程中湿润相饱和度与毛细压力的关系曲线,研究不同两相系统(水-气、水-油、油-气)中该关系的特点和联系。实验结果采用Van公式进行拟合,结果表明实测曲线和拟合曲线... 详细信息

采用根据张力计原理设计的简易装置实验测定多孔介质湿润相被单调驱替过程中湿润相饱和度与毛细压力的关系曲线,研究不同两相系统(水-气、水-油、油-气)中该关系的特点和联系。实验结果采用Van公式进行拟合,结果表明实测曲线和拟合曲线吻合很好。为了寻找预测任意两相系统湿润相饱和度与毛细压力关系的简单途径,在Parker等提出的折算理论基础上,采用两种方法处理实验数据、拟合参数,将折算系数应用于实测数据,结果表明通过引入折算系数,一组两相系统中湿润相有效饱和度与折算毛细压力的关系可用于其它两相。

关键词：不溶混流体两相毛细压力饱和度水油气

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OPTIMIZED DESIGN OF NATURAL ECOLOGICAL WASTEWATER TREATMENT SYSTEM BASED ON WATER ENVIRONMENT MODEL OF DYNAMIC MESH TECHNIQUE

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Journal of Hydrodynamics 2010年第1期22卷 1-8页

作者： XU Zu-xin WEI Zhong YIN Hai-long HUANG Li-hui state key {2. of pollution control and Resource Reuse Tongji University Shanghai 200092 China College of environmental Science and Engineering Shandong University Jinan 250100 China

A Natural Ecological Wastewater Treatment System （NEWTS） is usually built on natural terrain with necessary topography modification to improve water flowing route and pattern, and then the topography modified NEWTS should also have a reasonable water storage volume and hydraulic retention time so as to achieve the anticipated water purification effect. In this study, the dynamic mesh technique based on the finite element method and element storativity coefficients was presented to develop a two-dimensional hydrodynamic and water quality model, which was used to optimize the design of NEWTS under the dynamic land-water boundary due to various water storage volume. The models were employed in the optimized design of NEWTS from a large abandoned coal mine, which purifies the polluted water flowing into a large water storage lake, as part of the East Route South-to-North Water Transfer Project in china. Specifically, the natural topography modification scheme was presented, and further, a reasonable water storage volume and hydraulic residence time was obtained, based on the reasonable estimation of roughness coefficient and pollutant removal rate of the NEWTS with phragmites communis.

关键词： ecological wastewater treatment dynamic mesh hydrodynamic model water quality model abandoned coal mine

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挥发性有机污染物在土壤中的运移机制与模型

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土壤学报 2001年第3期38卷 315-323页

作者：彭胜陈家军王红旗北京师范大学环境科学研究所环境模拟与污染控制国家重点联合实验室北京100875

挥发性有机污染物在土壤多孔介质中有三种可能的存在状态 :溶于水中、挥发为气体及吸附于固体颗粒。挥发性有机污染物在水、气、固体颗粒三相间的物质交换与分配是决定其运移的重要因素 ,在相间物质交换为平衡的条件下 ,可用阻滞系数来... 详细信息

挥发性有机污染物在土壤多孔介质中有三种可能的存在状态 :溶于水中、挥发为气体及吸附于固体颗粒。挥发性有机污染物在水、气、固体颗粒三相间的物质交换与分配是决定其运移的重要因素 ,在相间物质交换为平衡的条件下 ,可用阻滞系数来表示其影响。污染物与土壤固体颗粒间的非平衡吸附解吸是相间交换中影响污染物运移的最重要的机制 ,由于天然土壤具有固有的不均质性。

关键词：污染物运移物质交换非平衡吸附解吸挥发性有机物土壤污染

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