A method for mapping flood hazard along roads
2014 (English)In: Journal of Environmental Management, ISSN 0301-4797, E-ISSN 1095-8630, Vol. 133, 69-77 p.Article in journal (Refereed) Published
A method was developed for estimating and mapping flood hazard probability along roads using road and catchment characteristics as physical catchment descriptors (PCDs). The method uses a Geographic Information System (GIS) to derive candidate PCDs and then identifies those PCDs that significantly predict road flooding using a statistical modelling approach. The method thus allows flood hazards to be estimated and also provides insights into the relative roles of landscape characteristics in determining road-related flood hazards. The method was applied to an area in western Sweden where severe road flooding had occurred during an intense rain event as a case study to demonstrate its utility. The results suggest that for this case study area three categories of PCDs are useful for prediction of critical spots prone to flooding along roads: i) topography, ii) soil type, and iii) land use. The main drivers among the PCDs considered were a topographical wetness index, road density in the catchment, soil properties in the catchment (mainly the amount of gravel substrate) and local channel slope at the site of a roadstream intersection. These can be proposed as strong indicators for predicting the flood probability in ungauged river basins in this region, but some care is needed in generalising the case study results other potential factors are also likely to influence the flood hazard probability. Overall, the method proposed represents a straightforward and consistent way to estimate flooding hazards to inform both the planning of future roadways and the maintenance of existing roadways.
Place, publisher, year, edition, pages
2014. Vol. 133, 69-77 p.
Physical catchment descriptors (PCDs), GIS, PCA, PLS, Probability of flood hazard
Environmental Sciences Ecology
IdentifiersURN: urn:nbn:se:su:diva-102089DOI: 10.1016/j.jenvman.2013.11.032ISI: 000331341300009OAI: oai:DiVA.org:su-102089DiVA: diva2:708002