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You searched for +publisher:"Delft University of Technology" +contributor:("Langeveld, J."). Showing records 1 – 2 of 2 total matches.

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Delft University of Technology

1. Van der Steen, A.J. Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:.

Degree: 2013, Delft University of Technology

Introduction Dutch municipalities have a legal duty in groundwater management. Adequate and effective management of horizontal subsurface drainage systems is important in fulfilling this duty. The service life time of these systems have to be optimized. Financial resources should be used efficiently. Only since a few years there is a proactive attitude towards management and maintenance of subsurface drainage systems. There is still little experience on how to manage and maintain urban subsurface drainage systems. Current knowledge on system behavior, failure mechanisms and effectiveness of maintenance is mainly based on research to field drainage in agricultural context. More fundamental knowledge on these topics is required in order to assess which maintenance and monitoring efforts are suitable for adequate system management. Approach My research focused on municipally managed, horizontal subsurface drainage systems (mainly installed in the sewer trench). System failure processes, possible locations of system failure, effectiveness of maintenance by jet-flushing and required monitoring and inspection efforts are studied. The knowledge is gained by execution of a detailed case study to two different system types located in the municipality of Utrecht. A predominantly submerged and a predominantly dry system. Past system state inspection and system behavior monitoring data are studied. Time series are analyzed with time series analyses tool Menyanthes. In the context of this research project, an extensive system behavior monitoring campaign is executed in the case systems. Furthermore, several inspection techniques including CCTV camera inspection are applied Results - Knowledge on failure mechanisms. The major failure mechanism observed in the case systems was the formation of ochre. Ochre contamination, a dynamic process, can lead to major problems with high groundwater tables. - Insight in location of failure. Results from this research show that besides problems in the drain-soil interface focused on in literature, internal network clogging can also be a major driver for system failure. - Insight in effectiveness of maintenance by jet-flushing. Jet-flushing appeared to be primary effective in removal of ochre blockages from the internal drain cross-sections. Time-scale of re-clogging is however short. Within several months, the effect can be negated. - A possible approach in system investigation and assessment. Based on the obtained experience in inspecting and monitoring the case systems, an approach in system investigation and assessment is developed. The approach is presented in a decision tree-like scheme. The scheme can be used for the development of a management and maintenance plan for a particular system. Recommendation for future research This research can be considered as initiating research. New questions arose during the research. Permanently submerged (modern) subsurface drainage systems are not yet studied in detail. Some processes are not fully understood yet. Further research is therefore… Advisors/Committee Members: Van de Giesen, N.C., Van de Ven, F.H.M., Langeveld, J., Kruithof, A..

Subjects/Keywords: subsurface drainage systems; horizontal subsurface drainage; groundwater management

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Van der Steen, A. J. (2013). Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:36e09b1d-2c13-4e8c-b230-9c62aebde60f

Chicago Manual of Style (16th Edition):

Van der Steen, A J. “Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:.” 2013. Masters Thesis, Delft University of Technology. Accessed March 30, 2020. http://resolver.tudelft.nl/uuid:36e09b1d-2c13-4e8c-b230-9c62aebde60f.

MLA Handbook (7th Edition):

Van der Steen, A J. “Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:.” 2013. Web. 30 Mar 2020.

Vancouver:

Van der Steen AJ. Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:. [Internet] [Masters thesis]. Delft University of Technology; 2013. [cited 2020 Mar 30]. Available from: http://resolver.tudelft.nl/uuid:36e09b1d-2c13-4e8c-b230-9c62aebde60f.

Council of Science Editors:

Van der Steen AJ. Functioning, monitoring and maintenance of urban horizontal subsurface drainage systems:. [Masters Thesis]. Delft University of Technology; 2013. Available from: http://resolver.tudelft.nl/uuid:36e09b1d-2c13-4e8c-b230-9c62aebde60f

2. Malek Pour, S. Judgment under uncertainty: a probabilistic evaluation framework for decision-making about sanitation systems in low-income countries:.

Degree: 2012, Delft University of Technology

Sanitation, as described by the World Health Organization (WHO), refers to the provisions of facilities and services for safe disposal of human urine and faeces. On the outset of the 21st century, 40% of the world’s inhabitants do not have access to sanitation facilities and still rely on a bucket, a bush or a backstreet for excretion. Technically, all options that are required to deal with the global sanitation problem seem to have been already developed. However, the challenge remains in selection and implementation of technologies in a way that the desirable outcomes would be resulted. Some decision-making support tools have been developed so far to address this problem by assisting the decision-makers in selecting the appropriate technologies. While decision-making is about considering the likelihood of uncertain events, in most of the existing evaluation approaches the complex task of predicting and evaluating probabilities is reduced to simple judgmental operations. Forinstance, evaluation of sanitation options is often performed based on predicting the outcomes that best represent a sanitation system, with no or little regard to the factors that limit the predictive accuracy. This thesis adopts a new evaluation approach by taking into account the real world examples from executed sanitation facilities and develops a probabilistic evaluation framework in which sanitation options are assessed based on the probabilities that specific outcomes occur in practice. Absolute judgments are replaced by probable assessments, as this approach tries to keep its distance from making the uncertain certain. Although there may be a hidden consensus that quantification of occurrence probabilities for various outcomes of sanitation options is not always possible, some quantification methods are developed and presented in this thesis for all the assessment criteria. Moreover, this thesis does not only focus on making the decisions, but also tries to channel the decisions in a way that the negative outcomes of sanitation facilities would be reduced through the measures that could be taken to improve the performance of sanitation options. By applying the probabilistic evaluation approach for decision-making about sanitation facilities in low-income unplanned slum settlement of Nyalenda in Kisumu, Kenya (based on limited available data about this region in literature) it is indicated that while a sanitation option may be known for fulfilling a certain task by definition, through a probabilistic evaluation it may be revealed that the local conditions are not likely to allow the expected outcome to occur in practice and as a result this option would have no priority among other options. The necessity for monitoring and post-evaluation of implemented sanitation projects in order to have sufficient feedback for improvement of future decisions is also highlighted. Advisors/Committee Members: Van Lier, J., Celemens, F., Langeveld, J., Talsma, L..

Subjects/Keywords: sanitation; decision-making; probabilistic

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Malek Pour, S. (2012). Judgment under uncertainty: a probabilistic evaluation framework for decision-making about sanitation systems in low-income countries:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:7d002127-eb37-4014-b6fe-850732d288fa

Chicago Manual of Style (16th Edition):

Malek Pour, S. “Judgment under uncertainty: a probabilistic evaluation framework for decision-making about sanitation systems in low-income countries:.” 2012. Masters Thesis, Delft University of Technology. Accessed March 30, 2020. http://resolver.tudelft.nl/uuid:7d002127-eb37-4014-b6fe-850732d288fa.

MLA Handbook (7th Edition):

Malek Pour, S. “Judgment under uncertainty: a probabilistic evaluation framework for decision-making about sanitation systems in low-income countries:.” 2012. Web. 30 Mar 2020.

Vancouver:

Malek Pour S. Judgment under uncertainty: a probabilistic evaluation framework for decision-making about sanitation systems in low-income countries:. [Internet] [Masters thesis]. Delft University of Technology; 2012. [cited 2020 Mar 30]. Available from: http://resolver.tudelft.nl/uuid:7d002127-eb37-4014-b6fe-850732d288fa.

Council of Science Editors:

Malek Pour S. Judgment under uncertainty: a probabilistic evaluation framework for decision-making about sanitation systems in low-income countries:. [Masters Thesis]. Delft University of Technology; 2012. Available from: http://resolver.tudelft.nl/uuid:7d002127-eb37-4014-b6fe-850732d288fa

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