Economic evaluation of the potential impacts of the erosion of Quebec's maritime coasts in a context of climate change / : Évaluation économique des impacts potentiels de l'érosion des côtes du Québec maritime dans un contexte de changements climatiques

In the Gaspésie – Îles-de-la-Madeleine administrative region, the length (54% of the coastline) and value (79% of the total) of potentially exposed transport infrastructure by 2065 are by far the highest in maritime Quebec, specifically in the RCM of La Haute-Gaspésie. [...] The analysis of coastal change at high temporal and spatial resolution performed in recent years by the LDGIZC and the UQAR coastal geoscience research chair has shown that different patterns of coastal evolution exist along the coasts of maritime Quebec, particularly because of the diversity in the types of coastlines and their high lithostratigraphic variability. [...] The choice of the data source used to assess future economic losses was made in the following order of priority: 1- Presence of recent coastal change data (≈1990 to present) (15% of coasts covered); 2- Presence of data derived from the coastal erosion monitoring network of the LDGIZC (2000- 2012) when the density of measuring stations is high within a single homogeneous segment (20% of coasts cove [...] The identification and use of the buildings were validated using graphic registers provided by each of the RCMs, with the exception of the Manicouagan RCM, the city of Port-Cartier in the RCM of Sept-Rivières, the RCM of Minganie, Rocher-Percé (except the area from L’Anse du Nord to Cap Blanc) and in the city of Matane in the RCM of Matanie. [...] The equation used to calculate building exposure in number of remaining years in a safe zone is shown in Figure 2. This is done by measuring the distance between the element and the current shoreline or coastline, subtracting the safety margin and dividing the difference by the probable annual migration rate to obtain the number of years before the element is exposed.