Papers
Info
The use of international data on fuel sales and vehicle fleet for the estimation of yearly national traffic volumes
International comparisons are frequently used to assess the road safety performance of a country or to monitor its development over time, at a national or regional level. In most instances either accident or injury risks have to be considered, which results in the need for a quantitative estimation of the amount of travel, namely traffic volumes. Only in special cases may risks be indirectly compared using methods of induced exposure.The required data on traffic volumes is not always readily available. This is especially true if old data or data from several countries for a long period are to be used, as in comparative time series analysis. Several simplifying assumptions can be adopted to bypass this lack of data but often the estimates resulting from these simple assumptions are not entirely satisfactory.Between 1996 and 1998 the European Union (EU) sponsored, within the scope of the 4th Research Framework Programme, a COST Action (COST 329) to analyse and establish a common methodological framework for description and analysis of safety developments
Year: 2005
Number Pages:
207-215.
Author(s): Cardoso, J. L.
: Accident Analysis and Prevention
Editor: Elsevier
Volume:
37.
Keywords: Traffic volume; Accident risk; Road Safety
Info
Transporte sedimentar num perfil de praia. Validação de um modelo matemático
N/A
Year: 2005
Number Pages:
pp. 33-39.
Author(s): Larangeiro, S. H. D. C.; Oliveira, F. S. B. F.; Taborda, R.; Silva, R.
Editor: Anais do Instituto Hidrográfico
Volume:
Nº 17.
Info
A Modeling System for Tidally Driven Long-term Morphodynamics
A modeling system to simulate tidally driven morphodynamics is developed and assessed. The system couples an existing shallow water model with a new morphological updating model. Four innovative features to improve the accuracy and efficiency of the system are implemented and tested. First, two alternatives are proposed to update the velocity field without running the hydrodynamic model. Both alternatives, based on an assumption on the behavior of friction, are more accurate than the traditional "continuity correction". Second, hydrodynamic results are provided in the frequency domain. The harmonic synthesis of the velocity time series simplifies interpolation and extrapolation of the hydrodynamic model results and the use of different time steps for the various components of the modeling system. Third, the time-integration of the sediment fluxes is performed with a Runge-Kutta method so the time step adapts in space and time to the flow characteristics. Finally, a criterion to determine the need for a new hydrodynamic simulation is derived, based on the importance of the errors introduced by the outdated flow field relative to those introduced by the sand-transport formulae.
Year: 2004
Number Pages:
42/4: 426-434.
Author(s): Fortunato, A. B.; Oliveira, A.
Editor: Journal of Hydraulic Research
Info
Accounting for the influence of initial chlorine concentration, TOC, iron and temperature when modelling chlorine decay in water supply
Degradation of water quality in supply and distribution systems is one of the foremost problems that water companies are faced with. It is every day practice in many countries to maintain a residual quantity of a disinfectant such as chlorine throughout the system, in order to ensure the safety of distributed water. However, the chlorine added at the water treatment plant disappears as it travels to the consumer tap, due to reactions in the bulk of the flow and at the pipewalls. This paper analyses the influence on free chlorine bulk decay of several water quality parameters, such as temperature, initial chlorine dosage, organic matter and iron content. The performance of five alternative kinetic models for describing the disinfectant behaviour is also assessed, considering both static and steady-state flow conditions. For the conditions tested, a parallel pseudo-first order model provided the best results. Although, in practice, parallel first order kinetic models fit experimental data better than the classic first order model, most water quality modelling software still relies on the latter as a base choice. The paper discusses practical conditions that may influence model selection for network simulation purposes, and the relevance of the associated errors.
Year: 2004
Number Pages:
15 p..
Author(s): Vieira, P.; Coelho, S.T.; Loureiro, D.
: Journal of Water Supply: Research and Technology
Editor: IWA
Volume:
53.7.
Keywords: Water distribution; Modelling; Kinetics; Decay; Chlorine
Info
Assessment of open boundary conditions on the elliptic formulation of the mild-slope equation
N/A
Year: 2004
Number Pages:
1567-1576.
Author(s): Oliveira, F. S. B. F.
Editor: Ocean Engineering
Volume:
Vol. 31/11-12.
Info
Caractrização e propagação da agitação marítima na praia de Porto Santo, Madeira
N/A
Year: 2004
Number Pages:
17 p.
Author(s): Fortes, C. J. E. M.; Capitão, R.; Neves, M. G.; Coli, A. B.
Editor: Artigo publicado da revista de Recursos Hídricos (APRH)
Volume:
vol. 25 nº 2, pp 25-42.
Info
DAMAGE ASSESSMENT AND DIAGNOSIS Sé Nova, Coimbra
This report concerns the Sé Nova, Coimbra, which was used as a case-study of the EU project COMPASS. It focuses the assessment of damage, diagnosis and advice for repair of salt decay anomalies. It concludes that repair of the damaged plasters could be done with a lime-mortar, as similar as possible to the existing one, namely in its high capillary absorption. A paint that does not constitute a barrier to the incoming salt solutions should also be used.
Year: 2004
Number Pages:
17.
Author(s): Gonçalves, T. D.; Delgado Rodrigues, J.
Editor: LNEC
Keywords: Plasters; Sé nova; Salt decay; Soluble salts; Case-study; Crystallization
Info
Decomposed rock mass characterization with crosshole seismic tomography at the Heroísmo station site (Porto)
At the Heroísmo station site (of Porto underground) there is a granitic rock mass formationnamed
Year: 2004
Number Pages:
531-538pp.
Author(s): Pereira, M. M.; Coelho, M. J.
Editor: Millpress, Rotterdam
Keywords: P-wave velocity; Seismic tomography; Residual soil; Rock mass characterization
Info
Emissários Submarinos em Portugal
N/A
Year: 2004
Number Pages:
11 p.
Author(s): Reis, M. T. L. G. V.; Neves, M. G.; Silva, L. G.
Editor: Artigo publicado na Revista da Associação de Recursos Hídricos
Info
Environmental Indicators as management tools of estuaries. Methodology and the case study of the Tejo estuary
N/A
Year: 2004
Number Pages:
13-24..
Author(s): Cardoso da Silva, M.; Rodrigues , A.
Editor: Journal of Coastal Conservation
Volume:
10.
|