10.4122/1.1000001239
Antunes, P. A.
P. A.
Antunes
Barbosa, A. E.
A. E.
Barbosa
Highway runoff characteristics in coastal areas \342\200\223 A case study in Aveiro, Portugal
DTU Library, Technical University of Denmark (DTU)
2005
Conference presentation
Coastal areas
highway runoff
monitoring
salinity
pollutants
Higher School Of Technology Of The Higher Institute For Technology Of Viseu, Environment Department
Environment Department
Higher School Of Technology Of The Higher Institute For Technology Of Viseu
Portuguese National Laboratory For Civil Engineering, Hydraulics
Hydraulics
Portuguese National Laboratory For Civil Engineering
2005
en
10.4122/1.1000001240
text/xml
In the framework of a study for the Portuguese Road Institute, the authors carried out a monitoring study of the IP5 highway, located at the coast line. The TSS and the turbidity values measured in 40 runoff samples were relatively low, resulting from the low potential of the drainage area and surroundings to contribute with solids. Heavy metals results (Fe, Zn, Cu, Pb, Cd and Ni) were in accordance with other studies. It was confirmed the continuous decrease in Pb concentrations in stormwater. Analysis revealed high levels of salinity (161 mg/l) and chlorides (51.3 mg/l) that are usually reported only for roads with de-icing salts application. Searches in the literature revealed only one reference to marine aerosols as contributing to chloride presence in stormwater, and no notice of increased pavement deterioration in coastal highways. Salinity present in coastal areas may provoke structural alterations in the pavement that may be associated to a larger release of its constituents. The fact that black particles were observed both in the runoff samples and at the IP5 drainage system may be indicators of such phenomena. The authors plan to carry on further field and laboratory investigations, with the objective of better understanding these phenomena.