Statistisk kartläggning av dimma längs E4:an mellan Helsingborg och Jönköping

Detta är en Kandidat-uppsats från Uppsala universitet/Luft-, vatten- och landskapslära

Författare: Caroline Vahlberg; [2013]

Nyckelord: ;

Sammanfattning: Fog is a small-scale weather phenomenon that are fascinating to people. However, the presence of fog in road traffic reduces the visibility and increases the risk of road accidents. By the Swedish Road Weather Information System (VViS), the safety on roads could ameliorate and road accidents caused by fog and other weather hazards could be prevented. Fog is however a complex and usually local phenomenon, why fog formation generally is not easy to predict. For that reason, a statistical mapping of fog, especially along a motorway with high traffic volumes, could be useful in planning to prevent road accidents.    The study begins with a theory section describing the formation and deformation of fog, important factors that influences the fog formation, favourable places where fog often tends to form, different types of fog and the problem it may cause for the road traffic. In this study, a statistical mapping of fog has been made at six places along the motorway E4 between Helsingborg and Jönköping during the period 1st of October 2004 – 30th of April 2012. The study is based on meteorological data from the Swedish Road Weather Information System. The purpose of the statistical mapping was to determine the total, the monthly and the daily frequency of the presence of fog at the different places, and analyse how local variations in terrain and weather at each place may affect the occurrence of fog. The results show that the daily variation of fog is most evident during April, where the frequency has its peak during the morning hours. During November, December and January, fog tends to occur anytime during the day and night. The study also show that fog is most common at the places who are located closest the seaside, and places where the local climate characterise by stagnation of cold air or a high emission of longwave radiation in combination with a moist environment or nearby lakes or watercourse.

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