Showing papers by "Slobodan Djordjević published in 2006"
01 Jun 2006
TL;DR: In this article, the authors presented a descriptive analysis performed on a real database containing collapse and blockage incident records for a large sewer system in the UK, using a hybrid modelling technique, evolutionary polynomial regression, two different formulas for blockage events and collapse failures.
Abstract: The sewer system is a service that is expected to function without interruptions. Continuous assessment, maintenance and rehabilitation are the key to maintaining a required level of service at an acceptable cost. An appropriate and cost effective prioritisation scheme for periodical surveys could be built based on failure data collected by sewerage companies over time. Such a scheme could be achieved using data-driven modelling techniques jointly with engineering knowledge of the failure mechanisms. This paper presents a descriptive analysis performed on a real database containing collapse and blockage incident records for a large sewer system in the UK. Starting from a statistical study of both failure types, the most important variables are identified and a classification scheme is suggested. Then, using a hybrid modelling technique, evolutionary polynomial regression, two different formulas for blockage events and collapse failures are obtained and their engineering interpretation is offered.
86 citations
TL;DR: A new MOGA, the preference ordering genetic algorithm, is proposed, that alleviates the drawbacks of conventional Pareto-based methods and is demonstrated on the calibration of a physically-based, distributed sewer network model.
23 citations
01 Jan 2006
TL;DR: In this paper, the authors describe the development of Whole Life Costing application to urban drainage management, which is based on the use of Key Performance Indicators (KPls) and is carried out over an extended time period, typically 50 years.
Abstract: This paper describes the development of Whole Life Costing application to urban drainage management. We report on the development of the methodology that incorporates the ability to bring together hydraulic and asset performance modelling with the costs of providing and maintaining service provision. A software platform has been specifically developed to provide an integrative mechanism to achieve this and to allow the investigation of alternative decisions. Importantly this approach is based on the use of Key Performance Indicators (KPls) and is carried out over an extended time period, typically 50 years. Whole Life Costing approaches on which this methodology is based, have been shown to offer an ideal platform to integrate the analyses of urban drainage systems with the costs associated with a particular management and operation regime and to link this with levels of service requirements and investment strategies. This provides tools that take account of system behaviour, performance and regulation within a sensible economic and engineering framework ensuring that the expenditure on service delivery by service providers is effective and efficient.
2 citations