11 results on '"Santos, Bertha"'
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2. Research of the impact of bumps on vehicle speeds
- Author
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Kempa, Jan, Chmielewski, Jacek, Prandol, Dominika, Santos, Bertha, and Gonçalves, Jorge
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- 2023
- Full Text
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3. Prioritization of railway proximity interventions: The case of the Portuguese railway network
- Author
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Gonçalves, Jorge, Santos, Bertha, and Oliveira, Alexandra
- Abstract
•Rail infrastructure management using MCDA and quadrant analysis.•Priority evaluation matrix for railway proximity interventions (close to the user).•Activities’ relevance based in technical and non-technical criteria best combination.•Flexible decision support tool adjustable by railway decision makers.•Most important activities imply 70% of the needed annual intervention investment.
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- 2022
- Full Text
- View/download PDF
4. GIS-based inventory for safeguarding and promoting Portuguese glazed tiles cultural heritage
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Santos, Bertha, Gonçalves, Jorge, Almeida, Pedro G., and Martins-Nepomuceno, Ana M. T.
- Abstract
Innovative, non-invasive, digital, and cost-effective instruments for systematic inventory, monitoring and promotion are a valuable resource for managing tangible and intangible cultural heritage. Due to its powerful and effective inventory and analysis potential, which allows supporting central and local entities responsible for cultural heritage management, Geographic Information Systems (GIS) have proven to be an appropriate information technology for developing these kinds of instruments. Given the above, this work aims to introduce a GIS-based instrument to support inventorying, safeguarding, tourism, and cultural promotion of the traditional Portuguese glazed tile (‘azulejo’, in Portuguese) to raise general awareness of the importance of this unique Portuguese heritage. To the best of the authors’ knowledge, there is no other instrument available with inventory and safeguarding management functions that is accessible and affordable, developed to be used at a municipal level and that contributes to the enrichment of the cultural and tourist information. Information from 70 tile works located in the Portuguese city of Covilhã was used to test the proposed GIS tool, resulting in a georeferenced alphanumeric, graphical, image and drawing inventory and in three pedestrian routes for touristic and cultural heritage promotion. The results were validated by both the research team and the municipality of Covilhã, foreseeing its expansion and daily use in the management of the heritage of the traditional Portuguese glazed tile. The proposed instrument can be replicated in other locations and easily implemented and managed by municipalities or institutions dealing with the protection of cultural heritage.
- Published
- 2023
- Full Text
- View/download PDF
5. Simplified Model of Road-User Costs for Portuguese Highways
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dos Santos, Bertha, de Picado-Santos, Luís, and Cavaleiro, Victor
- Abstract
When evaluating road design, maintenance, and rehabilitation, the Portuguese Road Administration does not consider road-user costs. A simplified model of road-user costs for highway networks and the selection of input values for Portuguese conditions were defined, with 2006 as the base year for calculations. The steps in defining the model were the analysis of the most important models of current road-user costs to provide the conceptual framework for a simplified and new model; the characterization of Portuguese highways by input data definition; and the inventory of official sources, formulations, and definition directives for input data. With the simplified formulation, user costs can be integrated in management frameworks in an easy, fast, and reliable way. A consideration of extended transport costs (construction, maintenance, and user costs) will allow a more accurate life-cycle economic analysis and will contribute to the sustainability of road infrastructure. Two applications of the model to Portuguese road networks under concession are presented.
- Published
- 2011
- Full Text
- View/download PDF
6. Simplified Model of Road-User Costs for Portuguese Highways
- Author
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Santos, Bertha Maria Batista dos, de Picado-Santos, Luís Guilherme, and Cavaleiro, Victor Manuel Pissarra
- Abstract
When evaluating road design, maintenance, and rehabilitation, the Portuguese Road Administration does not consider road-user costs. A simplified model of road-user costs for highway networks and the selection of input values for Portuguese conditions were defined, with 2006 as the base year for calculations. The steps in defining the model were the analysis of the most important models of current road-user costs to provide the conceptual framework for a simplified and new model; the characterization of Portuguese highways by input data definition; and the inventory of official sources, formulations, and definition directives for input data. With the simplified formulation, user costs can be integrated in management frameworks in an easy, fast, and reliable way. A consideration of extended transport costs (construction, maintenance, and user costs) will allow a more accurate life-cycle economic analysis and will contribute to the sustainability of road infrastructure. Two applications of the model to Portuguese road networks under concession are presented.
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- 2011
- Full Text
- View/download PDF
7. Validation of an indirect data collection method to assess airport pavement condition
- Author
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Santos, Bertha, Almeida, Pedro G., Feitosa, Ianca, and Lima, Débora
- Abstract
In this study the authors compare two methods for airport asphalt pavement distress data collection applied on the main runway of Amílcar Cabral international airport, located at Sal Island in Cape Verde. The two methods used for testing were traditional visual inspection (on-foot) and an indirect method using a vehicle equipped with image capture and recording, lasers and geolocation devices (in-vehicle inspection). The aim of this research is to contribute to the validation of the proposed low-cost in-vehicle pavement distress inspection system with semiautomatic data processing in order to be considered in the implementation of the pavement condition assessment component of airport pavement management systems (APMS). This is a particularly important component as from the collected distress data it is possible to assess the condition of the pavements and define intervention strategies. Validation of the indirect data collection method is evaluated by statistical comparison of the collected distress data and pavement condition index (PCI) obtained from both methods. Statistically non-significant differences between the result sets validate the proposed indirect method, however the analysis evidenced two aspects that need improvement in the proposed system, namely the quality of the captured images to identify distresses with lower severity level and inspector training for proper allocation of severity levels during image analysis. This results in significant advantages considering that the total amount of the runway pavement area is inspected. Inspection time is reduced and data collection cost can be reduced. Processing and results visualization on GIS environment allows revaluation of the dataset on the in-vehicle method. Data interpretation and measurements quality control becomes simpler and faster.
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- 2020
- Full Text
- View/download PDF
8. Data Collection Methodology to Assess Road Pavement Condition Using GNSS, Video Image and GIS
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Santos, Bertha, Almeida, Pedro G., and Maganinho, Leonor
- Abstract
Traffic loads, along with the environment, damage pavement over time. The degradation of pavement quality is reflected in the development of a diversity of pavement distresses, such as cracking, deformation or deterioration. These distresses may occur on the surface and/or in the pavement structure, having a determinant role in pavement's quality. Aiming to increase the degree of reliability of the pavement distress data and reduce pavement observation time and visual inspection operations cost, this work presents the main steps proposed for a methodology to observe, record and evaluate flexible road pavement distresses to assess the quality of road pavements. This methodology is based on an in-vehicle inspection using GNSS and video image capture devices and in the use of Geographic Information System (GIS). Validation of the proposed methodology was made through a case study by comparing the results obtained on the in-vehicle inspection to those from a traditional visual inspection performed on foot. The similarity of results obtained by the two approaches allowed to conclude about the feasibility of the proposed methodology. Among the main advantages of the proposed methodology a highlight is on the possibility to identify, quantify and locate the most severe pavement distresses through the use of spatial tools available on GIS, producing information maps and reports that can be used in the decision-making process about road pavements rehabilitation and conservation.
- Published
- 2019
9. Pedestrian Road Accident Index for Municipalities: The Portuguese Case
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Santos, Bertha and Carvalheira, Carmen
- Abstract
Portuguese road traffic accidents statistics show that the number of accidents with fatalities and serious injuries has in general decreased in recent years. However, the number of accidents involving pedestrians is still high when compared with those observed in other countries of the European Union. In order to assess this problem, an index of pedestrian road traffic accidents for municipalities that could be used in decision-making about pedestrian safety measures is proposed. The use of absolute values of accidents involving pedestrians (running over) does not allow itself a reliable comparison of pedestrian safety level between municipalities. In this sense, the approach proposed uses the information available in the Portuguese database PORDATA to calculate a municipal index that takes into account the degree of exposure of pedestrians to accident, based on national and municipal resident population annual growth rates and number of pedestrian's casualties. This index allows to identify the municipalities with unfavourable deviation to national numbers of road accidents involving pedestrians (per 10000 inhabitants), supporting the plan and allocation of human and economic resources for the diagnosis, definition and implementation of safety measures. The results obtained can be visualized in a GIS for a more comprehensive comparison between municipalities. The analyses performed for Portugal showed that, in general, municipalities with higher resident population annual growth rates, located mostly along the coastline and in more consolidated urban areas, tend to present better index values, which points to the need to intervene in less consolidated areas.
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- 2019
10. Pedestrian Environment Quality Assessment in Portuguese Medium-Sized Cities
- Author
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Sousa, Adriana, Santos, Bertha, and Goncalves, Jorge
- Abstract
The features of pedestrian spaces contribute to sustainable urban mobility and consequently to improve the quality of the built environment. A pedestrian space free of obstacles, with slight slopes, continuous, agreeable, attractive and safe, is definitely a space that invites to enjoyment and socialization. With the aim of improving the pedestrian circulation conditions, the present paper describes a set of approaches for assessing the quality of pedestrian environment and presents an adapted approach that can be used in medium-sized cities. Land use, pedestrian facilities and road/traffic attributes are the most common topics addressed in the pedestrian environment evaluation. These attributes can be expressed in scores and their spatial distribution can be represented using Geographical Information Systems (GIS), supporting the decision making process of pedestrian system improvement. For Portuguese medium-sized cities, the Pedestrian Environmental Quality Index (PEQI) was adapted and tested through a case study in Covilha city. The main steps of the methodology include the definition of relevant data, preparation of survey forms, training of data collection teams, data collection, database organization, PEQI calculation and GIS data visualization, management and maps production. The case study focused on the areas that have a significant pedestrian flow, either because of commercial, services and recreation activities, or because they are important links of the public transport system. As main findings, it was possible to conclude that the selected approach allows a great flexibility in the incorporation of new attributes and weights according to specific technical goals and scenarios (calibration).
- Published
- 2019
11. GIS-Based Transport Accessibility Analysis to Community Facilities in Mid-Sized Cities
- Author
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Tome, Andre, Santos, Bertha, and Carvalheira, Carmen
- Abstract
Transport accessibility is an important issue for the sustainable development of cities. This work presents a GIS-based accessibility analysis approach that can be applied to assess accessibility to community facilities in medium-sized cities using publicly available data. For that purpose, a case study was developed using the road network and public transport data from Covilha municipality, in Portugal. Data collected on websites were treated and organized to build the network dataset and perform network analyses with the aid of the ArcGis(r) Network Analyst extension (creation of service areas and Origin-Destiny (OD) cost matrices). Four accessibility evaluation analyses were performed for two transport modes: accessibility to the municipality main community facilities by private and urban public transport (isochronous and OD matrices), by inter-urban public transport (time); and accessibility by private transport between civil parishes (isochronous and OD matrices). The population and the territory covered by different travel times were also determined. The case study results showed that the accessibility in Covilha is quite reasonable, either using private transport inside the municipality (maximum 30 minutes for covering nearly 95% of the resident population and 83% of the territory), or urban public transport inside the urban perimeter (maximum 50 minutes). However, the periphery civil parishes of the municipality have lower levels of accessibility for inter-urban public transport (reaching 115 minutes). The utility of the approach was validated through the results obtained in the case study, where it was possible to observe patterns of accessibility across the municipality for the considered modes, making it possible to improve the overall accessibility through the identification of priority areas of intervention.
- Published
- 2019
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