Jónas Elíasson

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Cost-benefit analysis (CBA) is widely used in public decision making on infrastructure investments. However, the demand forecasts, cost estimates, benefit valuations and effect assessments that are conducted as part of CBAs are all subject to various degrees of uncertainty. The question is to what extent CBAs, given such uncertainties, are still useful as a(More)
Short-duration precipitation bursts can cause substantial property damage and pose operational risks for wastewater managers. The objective of this study was to assess the present and possible future flood hazard in the combined sewer system in Reykjavik city centre. The catchment is characterised by two hills separated by a plain. A large portion of the(More)
The Expert Group consists of eight traffic experts with various specialities. The group read all documentation and then, during three intensive full-day seminars, drew the conclusions presented in this summary of the evaluation of the Stockholm Trial. Several group members have in different ways participated in preparatory tasks prior to the evaluation and(More)
The theory for non-stationary flow in translatory waves is developed for an inclined plane in a prismatic channel and a funneling channel. The existence of translatory waves traveling over dry land or superimposed on constant flow is established, and the dependance on the initial flow value is discussed. Inherent instabilities of the wave tail are(More)
The environment in which transport analysis and infrastructure planning takes place has changed dramatically during the last years. The focus is now, to a considerable extent, on how to transform the transport system in a direction that could be sustainable in the long run, rather than on planning for infrastructure investment to meet new demand. At the(More)
Transport investments and policies have increasingly shifted towards dealing with transport congestion rather than with shortening the potential free flow travel time. However, appraisal methodologies for congestion mitigation projects are relatively less well developed compared to methodologies for projects reducing free flow travel times. For instance,(More)
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