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KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Physics.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Snowfall often causes limitations for road transportation and large efforts are devoted to snow removal. Snow that falls on a road surface often melts due to the surface being warmer than the air under some circumstances. Melting of snow can also be induced by use of road salt. Consequently, snow measurements by precipitation sensors along roads may indicate thicker snow depths than are actually present on the roads. A method for determining the onset time of snow accumulation on roads based on a combination of precipitation measurements and image processing is presented. The method detects whether the snow accumulates rather than melts. It can be used to calculate accumulated snow depth, a more accurate measurement than using precipitation sensors alone. The method was tested over one winter and showed potential to improve the description of snow accumulation in a road network, which could lead to more efficient planning of snow removal.

Keyword [en]
Winter road maintenance; Snow ploughing; Image analysis
National Category
Engineering and Technology Other Earth and Related Environmental Sciences
URN: urn:nbn:se:kth:diva-105142OAI: diva2:570101

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.
Trita-LWR. PHD, ISSN 1650-8602 ; 1069
winter road maintenance; sensors; infrared thermometry, energy efficiency, road salt
National Category
Other Civil Engineering
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)

QC 20121116

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

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Riehm, MatsJansson, Per-Erik
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