terrain modeling Articles

  • Complex terrain dispersion modelling exercise

    In the framework of the Fourth Workshop, a model inter-comparison exercise is proposed with respect to environmental impact assessment. The purpose of the exercise is to study the compatibility of the performance of similar dispersion models over complex topographies. Contributors were asked to use the same meteorological input over complex terrain topography and to perform dispersion ...


    By Inderscience Publishers

  • Dispersion modelling in complex terrain using wind climatologies

    If annual mean values of concentration in complex terrain have to be determined, a representative wind climatology, which reflects local flow characteristics, is needed. This gives rise to two problems. First, observational data representative of the dispersion area are frequently not to hand. Second, the flow in the dispersion area itself may show a significant spatial structure, so transport is ...


    By Inderscience Publishers

  • Influence of high-model grid resolution on photochemical modelling in very complex terrains

    The study of photochemical pollution in very complex terrains, such as the Northeastern Iberian Peninsula (NEIP), is primarily influenced by local topography. This kind of study demands a high spatial resolution. In order to illustrate the influence of the grid resolution on tropospheric ozone levels, several simulations were carried out with MM5-EMICAT2000-CMAQ model using horizontal resolutions ...


    By Inderscience Publishers

  • AERMOD Versus CTDMPLUS: A Complex Terrain Case Study

    ABSTRACT The American Meteorological Society/U.S. Environmental Protection Agency (AMS/EPA) Regulatory Model Improvement Committee (AERMIC) has updated the Industrial Source Complex (ISC) air dispersion model. The AERMIC model (AERMOD) is capable of predicting ambient pollutant concentrations in simple terrain and elevated terrain. The complex terrain capabilities of AERMOD are of particular ...


    By Weston Solutions, Inc

  • Particulate matter pollution simulations in complex terrain

    The preliminary results of a simulation of the air quality in a region of Northern Italy are presented. The simulation was performed using a modelling system based on a meteorological model, an interface code and a transport–chemistry model. Comparisons with measured data are presented and discussed. Keywords: PM pollution, air quality, transport–chemistry modelling, dispersion ...


    By Inderscience Publishers

  • Realistic approach to 2-D flow modelling for complex terrain

    The capabilities of regional and mesoscale meteorological models make them attractive to use in air pollution studies. Especially, flow modelling and dispersion analysis in complex terrain plays an important role in the control of emissions into the atmosphere. In the numerical simulation of an atmospheric phenomenon, various coordinate systems are used to represent the terrain and the vertical ...


    By Inderscience Publishers

  • Evaluating emergency response models of radiological dispersion in complex terrain

    Operational airborne releases of trace quantities of the radioactive noble gas 41Ar from the HIFAR Nuclear Research Reactor located in Sydney, Australia, are valuable for evaluating emergency response models incorporating radiological dispersion. A network of meteorological stations and GR–150 environmental gamma dose detectors are placed in the complex terrain within a 5 km radius of the site. ...


    By Inderscience Publishers

  • ADMS 5 Complex Terrain Validation Westvaco Corporation

    1 Introduction The Westvaco Corporation's pulp and paper mill1 in rural Luke. Maryland is located in a complex terrain setting in the Potomac River valley [2]. A single 190-in buoyant source was modelled for this evaluation. There were 11 SO2 monitors surrounding the facility, with eight monitors well above stack top on the high terrain east and south of the mill at ...

  • Model evaluation of RIMPUFF within complex terrain using an 41Ar radiological dataset

    The newly updated atmospheric dispersion model RIMPUFF is evaluated using routine releases of 41Ar from the former HIFAR research reactor located in Sydney, Australia. A large number of 41Ar measurements from a network of environmental gamma detectors are used to evaluate the model under a range of atmospheric stability conditions within the complex terrain area. Model sensitivity of input ...


    By Inderscience Publishers

  • Methodology of model testing and application to dispersion simulation above complex terrain

    This paper concerns an integrated model testing exercise focussed on the use of model performance statistical indices. SAFE_AIR is a multisource model mainly designed to describe dispersion of airborne pollutants from point sources at local-to-regional scales over complex terrain in non-stationary meteorological and emission conditions. It was applied in the region of Ilo, Peru, a complex coastal ...


    By Inderscience Publishers

  • Comparison of two different operational models for complex terrain in neutral flow

    The estimation of pollutant concentration from sources in complex terrain is something very difficult to achieve in an operational situation. In this paper, we evaluate two different approaches of wind-field modelling. The first is a fully used, mass consistent, model (MINERVE) from Aria Technologies, based on the interpolation of wind data under the constraint of minimising flux divergence. The ...


    By Inderscience Publishers

  • Modelling urban canopy and terrain for transport diffusion simulations at sub-mesoscales

    Studies of the transport and dispersion of atmospheric pollutants at the scale of a part or the whole of an urban agglomeration require numerical simulations over domains between a few kilometres and a few tens of kilometers (sub-meso scale to meso-y scale). Current computer capabilities do not allow for a grid resolution sufficiently fine to explicitly simulate the flows at the scale of urban ...


    By Inderscience Publishers

  • Development of numerical model for dispersion over complicated terrain in the convective boundary layer

    Complicated terrain and atmospheric stability are important factors in the predicting the dispersion of air pollutants. The aim of our study is to develop practical dispersion model for unstable conditions for regulatory use. The numerical model we adopted was a combination of the potential flow model and Lagrangian stochastic dispersion model. In this model, time-mean flow field is solved by the ...


    By Inderscience Publishers

  • A heuristic approach to particle flows in complex terrain

    A heuristic approach based on emulating the Navier-Stokes equations is proposed for a shorthand description of flows of airborne particle in complex terrain. The exercise is motivated by the need for a simple, computer-inexpensive, yet comprehensive and flexible model to support a software package on nuclear accident consequence assessment, currently in development at IFA-Bucharest. Central to ...


    By Inderscience Publishers

  • Influence of turbulence closure on the simulation of flow and dispersion in complex terrain

    A dispersion simulation test for the RAMS-MIRS-SPRAY (RMS) modelling system in real complex terrain is presented. As a test case, the TRACT campaign was chosen because this data set allows the comparison of both the meteorological variables and the tracer concentrations. Particular attention was focused on testing alternative turbulence closures and assessing their influence on modelling both the ...


    By Inderscience Publishers

  • ADMS 5 Flat Terrain Validation Kincaid, Indianapolis and Prairie Grass

    1 Introduction This document presents a summary of ADMS model results compared against three well known field data sets: Prairie Grass. Kincaid and Indianapolis. Results are also presented for two U.S. models: ISCST and AERMOD. ISC ST is the United States Environmental Protection Agency model. It is a so-called 'old generation' model, similar to the UK R-91 model, based on the ...

  • Simulating the impact of roads on hydrological responses: examples from Swedish terrain

    In this study, the potential impacts of road topography on hydrologic responses at the watershed scale were simulated. The method considered used a geographic information system to identify road embankment locations and subsequently remove them from the baseline elevation data. Starting from both the ‘with’ and ‘without’ road elevation model, the surface and near-surface hydrological responses ...


    By IWA Publishing

  • A numerical study of mesoscale airflow and dispersion over coastal complex terrain

    A computational system composed of a three dimensional (3D) mesoscale model and a Lagrangian stochastic model is applied to forecast the boundary layer dynamics and Carbon Oxide (CO) air concentrations from motor vehicle emissions in the Rome urban area over the Lazio region of Italy. The model results show a general good agreement with observations at one location near Rome. The simulation ...


    By Inderscience Publishers

  • Validation of numerical simulations of precipitation in complex terrain at high temporal resolution

    Atmospheric flow over Iceland has been simulated for the period January 1961 to July 2006, using the mesoscale MM5 model driven by initial and boundary data from the ECMWF. A systematic comparison of results to observed precipitation has been carried out. Undercatchment of solid precipitation is dealt with by looking only at days when precipitation is presumably liquid or by considering the ...


    By IWA Publishing

  • ADMS 5 Complex Terrain Validation Hogback Ridge Tracer Experiments

    1 Introduction During October 1982. the United States Environmental Protection Agency (US EPA) earned out a series of eleven tracer gas experiments near Farmington, New Mexico, in the United States [1]. Hogback Ridge is a small hill with maximum elevation 104 m above the minimum elevation in the area. The terrain is semi-arid, with sparse vegetative cover of desert shrubs and grasses. ...

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