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Rong-Rong Z.,Beijing Urban Construction School | Che-Sheng Z.,CAS Institute of Geographical Sciences and Natural Resources Research | Zhong-Peng H.,Beijing Urban Construction School | Xiao-Meng S.,Nanjing Hydraulic Research Institute
Environmental Forensics | Year: 2012

Environmental pollution problems are crucial concerns that have attracted a great deal of public attention. More actions are urgently required on formulating remediation strategies for contaminated sites and setting effective standards and regulations for reducing the toxic pollutants in the environment. To achieve these needs, comprehensive understanding of and characterizing the natural behavior of chemical in the environment are essential tasks for environmental risk assessment and management. Compared with direct multimedia monitoring, multimedia-modeling systems are more viable and practicable. In this article, most widely recognized multimedia models were categorized and reviewed. The concepts that form the foundation of each multimedia model were described, and the advantages and the limitations of multimedia model were discussed. The aim of this article was to consider challenges and opportunities in improving present multimedia modeling system and also to pave the way for future research in this field. © 2012 Copyright Taylor and Francis Group, LLC. Source


Zhang R.,Beijing Urban Construction School | Zhan C.,Chinese Academy of Sciences | Song X.,Nanjing Hydraulic Research Institute | Song X.,Chinese Ministry of Water Resources | Liu B.,China University of Geosciences
Frontiers of Environmental Science and Engineering | Year: 2014

Part I of this study develops an enhanced environmental multimedia modeling system (EMMS) based on fuzzy-set approach. Once the model development is complete, the composite module and the entire modeling system need to be tested and validated to ensure that the model can simulate natural phenomena with reasonable and reliable accuracy. The developed EMMS is first tested in a complete case study. And then verification results are conducted to compare with extensively researched literature data. In the third step, the data from an experimental landfill site is used for a pilot-scale validation. The comparisons between EMMS outputs and the literature data indicate that the EMMS can perform accurate modeling simulation. The modules of EMMS could support the entire environmental multimedia modeling system. Further field-scale validation is finished. The results are satisfactory. Most of the modeling yields closely match the monitoring data collected from sites. In addition, with the aid of fuzzy-set approach, EMMS can be a reliable and powerful tool to address the complex environmental multimedia pollution problems and provide an extensive support for decision makers in managing the contaminated environmental systems. © 2014 Higher Education Press and Springer-Verlag Berlin Heidelberg. Source


Zhang R.,Beijing Urban Construction School | Zhan C.,CAS Institute of Geographical Sciences and Natural Resources Research | Song X.,Nanjing Hydraulic Research Institute | Song X.,Chinese Ministry of Water Resources | Liu B.,China University of Geosciences
Frontiers of Environmental Science and Engineering | Year: 2015

Part I of this study develops an enhanced environmental multimedia modeling system (EMMS) based on fuzzy-set approach. Once the model development is complete, the composite module and the entire modeling system need to be tested and validated to ensure that the model can simulate natural phenomena with reasonable and reliable accuracy. The developed EMMS is first tested in a complete case study. And then verification results are conducted to compare with extensively researched literature data. In the third step, the data from an experimental landfill site is used for a pilot-scale validation. The comparisons between EMMS outputs and the literature data indicate that the EMMS can perform accurate modeling simulation. The modules of EMMS could support the entire environmental multimedia modeling system. Further field-scale validation is finished. The results are satisfactory. Most of the modeling yields closely match the monitoring data collected from sites. In addition, with the aid of fuzzy-set approach, EMMS can be a reliable and powerful tool to address the complex environmental multimedia pollution problems and provide an extensive support for decision makers in managing the contaminated environmental systems. © 2014, Higher Education Press and Springer-Verlag Berlin Heidelberg. Source


Zhan C.,Chinese Academy of Sciences | Zhang R.,Beijing Urban Construction School | Song X.,Nanjing Hydraulic Research Institute | Song X.,Chinese Ministry of Water Resources | Liu B.,China University of Geosciences
Frontiers of Environmental Science and Engineering | Year: 2013

Multimedia environmental modeling is extremely complex due to the intricacy of the systems with the consideration of many related factors. Traditional environmental multimedia models (EMMs) are usually based on one-dimensional and first-order assumptions, which may cause numerical errors in the simulation results. In this study, a new user-friendly fuzzy-set enhanced environmental multimedia modeling system (FEEMMS) is developed, and includes four key modules: an air dispersion module, a polluting source module, an unsaturated zone module, and a groundwater module. Many improvements over previous EMMs have been achieved through dynamically quantifying the intermedia mass flux; incorporating fuzzy-set approach into environmental multimedia modeling system (EMMS); and designing a user-friendly graphic user interface (GUI). The developed FEEMMS can be a useful tool in estimating the time-varying and spatial-varying chemical concentrations in air, soil, and groundwater; characterizing the potential risk to human health presented by contaminants released from a contaminated site; and quantifying the uncertainties associated with modeling systems and subsequently providing robustness and flexibility for the remediation-related decision making. © 2013 Higher Education Press and Springer-Verlag Berlin Heidelberg. Source


Xiao Y.,Chongqing University | Liu X.,Chongqing University | Zhang R.,Beijing Urban Construction School
Energy and Buildings | Year: 2012

A Z-transfer function method is proposed to calculate transient heat flow through the envelope of an underground cavern in this paper. The envelope of an underground cavern has great heat capacity and high thermal inertia. In order to obtain the correct Z-transfer coefficients, indoor air temperature is expressed as a superposition of mean annual temperature, annual temperature wave and daily temperature wave. Corresponding to the three types of temperatures, three heat flows are calculated separately, and then are superposed. The thermal zones formed by annual temperature wave and daily temperature wave are different; thus, the ratio of amplitude frequency characteristics of the transfer functions is proposed to define the boundaries of the two different thermal systems. After transforming an underground cavern into an equivalent cylinder, the Z-transfer function coefficients of two thermal systems are calculated. Case study shows that heat fluxes at interior surface calculated by Z-transfer coefficient method have good agreement with those by numerical finite difference method, and the deviation between the results from two methods is only 1% of that from numerical method. However, the computation time of Z-transfer coefficient method is less than 1% of that of numerical method. © 2011 Elsevier B.V. All rights reserved. Source

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