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- Johansson Thunqvist, Eva-Lotta, et al.
(författare)
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Airborne spreading and deposition of de-icing salt : A case study
- 1999
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Ingår i: Science of the Total Environment. - : Elsevier. - 0048-9697 .- 1879-1026. ; 235:1-3, s. 161-168
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Tidskriftsartikel (refereegranskat)abstract
- In this study it was concluded that between 20 and 63% of the de-icing salt applied on the road was transported by air and deposited on the ground 2-40 m from the road. The reason for the higher percentages is suggested to be intense snowfall, which leads to more splash generation and ploughing. Ninety percent or more of the total deposition occurs within 20 m at all transects. For all periods and both localities the deposition was greater on the east side of the road, which reflects the prevailing westerly winds in relation to the de-icing action occasions.
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- Johansson Thunqvist, Eva-Lotta, et al.
(författare)
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Factors regulating the air-borne spreading of pollutants from roads
- 1998
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Ingår i: The Xth International PIARC Winter Road Congress. - London : PTRC Education and Research Services Ltd. ; , s. 459-468
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Konferensbidrag (refereegranskat)abstract
- Pollutants from roads are spread by mechanisms such as splash, spray and ploughing. In this study, the spreading was studied at two locations where information on the local weather was available and the amount of salt applied on the road could be obtained. When comparing the deposition of Na, Ca, K and Mg, the road-related gradient is obvious; the increase of sodium in the containers closest to the road is sometimes more than 1000-fold, and the increase of the other cations 10 - 100 fold. Also during a period of no de-icing the deposition of cations is higher towards the road. The deposition of Na is related to the amount of road salt applied, and also to wind and type and amount of precipitation. The increase of other cations could be an effect of weathering and/or ion-exchange on the fresh surfaces of the road.
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