Abstract
The assessment of psychosocial impacts related to coastal hazards (erosion, submersion) has so far been mainly qualitative. As cost-benefit analysis is gaining popularity among communities to assess adaptation options in the face of increasing coastal hazards, there is a need to develop quantitative indicators to improve the inclusion of human impacts in decision-making. The project therefore aimed to suggest quantitative indicators for a cost-benefit analysis in the Lower St. Lawrence region exposed to the waters of the estuary of the St. Lawrence River in eastern Quebec, Canada. A systematic survey of five municipalities was conducted in 2019 (n = 101). In general, the prevalence of mental health impacts was the double than that of physical health (30 vs. 14%); and was higher for affected respondents: 50.0 and 23.9%, against 13.5 and 5.8% for unaffected respondents.With regards to psychosocial impacts, the main results were that affected people were 2.33 more stressed in normal times than unaffected respondents and this variation increased to 3.54 during a storm surge warning;the quality of sleep of affected respondents when a storm warning is issued was 2.39 poorer than that of unaffected respondents.With regards with economic impacts, an additional 11% in absenteeism has been observed among respondents affected;the likelihood of experiencing financial difficulties was 1.27 higher for those affected;a small subgroup of affected respondents (<10) declared a mean of 400 CAD of additional health expenses.The results show that the assistance received provides little protection against stress, or even increases it, if it is mainly financial. In addition, a high degree of social isolation and living alone increases stress in the face of hazards. Thus, social capital and psychosocial assistance act as a protective factor in reducing psychosocial impacts. The probability of financial stress, on the other hand, increases in the event of maladaptation (inefficient adaptation expenditures leading to repair costs). Overall, the importance of the impacts measured justifies further economical investigation for their inclusion in the cost-benefit analysis.
Highlights
In flood and shoreline erosion risk management, cost-benefit analysis (CBA) is the economic comparison of all direct and indirect benefits and costs of different technically feasible adaptation or mitigation options (Penning-Rowsell et al, 2013, Circé et al, 2016)
There is a lack of quantitative data on psychosocial impacts, which directly limits its integration into CBA
The objective of this study was to quantify the psychosocial impacts of coastal hazards on shoreline populations in eastern Quebec, in order to integrate them into a CBA
Summary
In flood and shoreline erosion risk management, cost-benefit analysis (CBA) is the economic comparison of all direct and indirect benefits and costs of different technically feasible adaptation or mitigation options (Penning-Rowsell et al, 2013, Circé et al, 2016). These analyses make it possible to determine priority areas or intervention strategies, identify the most appropriate adaptation measures and justify the investments associated with coastal management. The purpose of this paper is to present the results of a quantification of the psychosocial impacts of flooding and coastal erosion with a view to their integration into a CBA of adaptation options at the municipal level
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