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ROAD SURFACE WETNESS AS AFFECTED BY EVAPORATION, SURFACE RUNOFF AND TRAFFIC SPLASHING
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Physics.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Physics.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Road surface wetness governs the fate of pollutants on the road surface. The wetness is also important for estimating the risk of ice formation during winters. The road surface water is affected by evaporation, run-off and traffic induced splash and spray. Increased knowledge of how these processes govern the road surface water and how they could be modelled would help to improve the possibility to abate problems with raised levels of air pollutants, as well as traffic safety issues by facilitating optimization of the use of anti- and de-icing chemicals. The aim of this study was to use a modeling tool in order to differentiate between three processes governing the loss of wetness from the road surface within a cross section of a road during two different climatic scenes (winter and spring). Two new measurement techniques were used for detailed measurements of road surface wetness across a road to validate the model. It could be concluded that the changes in wetness on the road can be simulated from general simple weather and traffic information. Furthermore, the wetness across the road is very heterogeneous and can be described by a distribution of regulating parameter values. The presented model application has a potential for real time application on roads and within a region and also for predictions of future conditions by using weather forecast data.

National Category
Other Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-105150OAI: oai:DiVA.org:kth-105150DiVA: diva2:570108
Note

QS 2012

Available from: 2012-11-16 Created: 2012-11-16 Last updated: 2012-11-16Bibliographically approved
In thesis
1. Measurements for winter road maintenance
Open this publication in new window or tab >>Measurements for winter road maintenance
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Winter road maintenance activities are crucial for maintaining the accessibility and traffic safety of the road network at northerly latitudes during winter. Common winter road maintenance activities include snow ploughing and the use of anti-icing agents (e.g. road salt, NaCl). Since the local weather is decisive in creating an increased risk of slippery conditions, understanding the link between local weather and conditions at the road surface is critically important. Sensors are commonly installed along roads to measure road weather conditions and support road maintenance personnel in taking appropriate actions. In order to improve winter road maintenance, more precise information about road surface conditions is essential. In this thesis, different methods for estimation of road weather are developed, discussed and tested. The methods use the principles of infrared thermometry, image analysis and spectroscopy to describe ice formation, snow accumulation and road surface wetness in specific patches or along road sections. In practical applications, the methods could be used for better planning of snow clearing operations, forecasting of ice formation and spreading of road salt. Implementing the proposed methods could lead to lower maintenance costs, increased traffic safety and reduced environmental impact.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. x, 45 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1069
Keyword
winter road maintenance; sensors; infrared thermometry, energy efficiency, road salt
National Category
Other Civil Engineering
Identifiers
urn:nbn:se:kth:diva-105152 (URN)978-91-7501-566-8 (ISBN)
Public defence
2012-12-07, V1, Teknikringen 76, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20121116

Available from: 2012-11-16 Created: 2012-11-16 Last updated: 2013-09-02Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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Output format
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