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- Title
Aplicação ao Porto de Sines (Portugal) de uma nova Metodologia de Avaliação do Risco para a Navegação Portuária utilizando o Sistema de Informação Geográfica Guiomar.
- Authors
Neves, Diogo Ruben; Rodrigues, Sara; Reis, Maria Teresa; Fortes, Conceição Juana; Santos, João Alfredo
- Abstract
This paper describes a first approach on the port navigation risk assessment using GUIOMAR, an integrated system for port and coastal engineering modelling developed at the National Civil Engineering Laboratory (LNEC), Portugal, using the GIS software ArcGIS™. One of the major concerns in naval and port engineering is the navigation safety within a port. When there is an obvious lack of security, the consequences might be devastating. Losses of human lives, cargo disturbances and environmental impacts can heavily penalize the maritime industries. Consequently, it has become increasingly important to develop methodologies and tools for risk assessment in port navigation. To assess the risk in port navigation, an integration of sea wave data near the port with numerical simulations is required, thus enabling the definition of the least favorable scenarios in terms of port navigation. A better understanding of the sea wave characteristics can be obtained using the numerical models of wave propagation and deformation that allow the simulation of relevant scenarios. However, since numerical models lead to large amounts of information, their implementation is complex and requires time for both preparation of the input data and results analysis. It is in this aspect that Geographical Information Systems (GIS) are an asset, allowing a better understanding of spatial and temporal information associated with complex natural phenomena through the sampling of trends and patterns that are essential in any decision-making process. In this context, the GUIOMAR system (Neves et al., 2009a,b) has been developed at the National Civil Engineering Laboratory (LNEC), Portugal, to become an integrated system for port and coastal engineering modelling in Portugal. Since this system is based on the GIS commercial software ArcGisTM, it enables the application of wave propagation models using all the functionalities inherent to GIS software and will certainly help in the management of port and coastal zones. A set of automatic procedures was designed to include a new methodology for navigation risk assessment based on the height of the waveinduced vertical movement of a ship along her trajectory. For each ship considered, the methodology can be summarized in three major steps: (i) determination of the wave regime at the gravity centers of the sections of the ship's trajectory within the port; (ii) determination of the amplitude of the vertical movements of a selected point in the ship in each of those gravity centers; and (iii) evaluation of the port navigation risk by assessing the product of the degree of probability of exceedance of a pre-set threshold for the ship's vertical movements by the degree of its consequences. To test these new procedures, a set of sea wave records of the Sines wave-buoy from 1988 to 2002 was transferred into the Sines Port using two numerical models for sea wave propagation and deformation (SWAN and DREAMS), included in the GUIOMAR system. The numerical model WAMIT was used for estimating the wave-induced vertical movements of two ships inside the port. By applying these new procedures, automatic generation of risk maps was carried out for three different trajectories for entrance voyages into the port: one ending at the oil terminal, another at the multipurpose terminal and another at the fishing port. These developments do contribute towards a more versatile and efficient GUIOMAR system, which results in a more adequate tool to support decision-making processes in port and coastal management.
- Subjects
PORTUGAL; COASTAL engineering &; the environment; CIVIL engineering &; the environment; GEOGRAPHIC information system software; ENVIRONMENTAL impact analysis; ENVIRONMENTAL risk assessment; PORT of Sines (Portugal)
- Publication
Journal of Integrated Coastal Zone Management / Revista de Gestão Costeira Integrada, 2010, Vol 10, Issue 4, p483
- ISSN
1646-8872
- Publication type
Article
- DOI
10.5894/rgci232