Table 2 Description of the risk dimensions and how they were calculated and normalized in this study
From: Riverine communities in the Central Amazon are largely subject to erosion and sedimentation risk
Dimensions | Variable /Indicator | Maximum value in all communities | Normalization |
|---|---|---|---|
Hazard | Increasing open water trends (erosion) Decreasing open water trends (sedimentation) | 48.05 73.22 | Increasing trends (erosion) / maximum values Decreasing trends (sedimentation) / maximum values |
Exposure | Total number of people | 649 | Total number of people / maximum values |
Vulnerability | Distance to Tefé’s urban area (km) | 384 | Distance to Tefé’s urban area / maximum values |
Distance to the nearest urban center (km) | 124 | Distance to the nearest urban center / maximum values | |
Total number of community migrations due to either erosion or sedimentation | does not apply | Values were defined as 1 = no migration, 0.8 = 1 migration, 0.6 = 2 migrations, 0.4 = 3 migrations and 0.2 = 4 migrations. Considering that the highest values correspond to the most vulnerable locations, due to the lack of experience in dealing with changes. | |
Number of women | 305 | Number of women / maximum values | |
Number of children | 254 | Number of children / maximum values | |
Number of elderly people | 29 | Number of elderly / maximum values | |
Education index | Does not apply | 2/3 (community people between 10–14 years that can read) + 1/3 (community people over 15 years old that can read). | |
Economic Development index | Does not apply | Average number of equipments per house in a community / Maximum value in all communities | |
Social Organization index | Does not apply | With Community Association = 0.25 + With community center = 0.25 + With school = 0.25 + With health agent = 0.25 | |
Social Development Index (SDI) based on three dimensions: education, economic development and social organization | does not apply | SDI = (Education Index + Economic Development index + Social Organization index) / 3The final value for risk computation is considered as (1 - SDI), to make communities with lower SDI values to have higher vulnerability | |
Total Vulnerability | Average of the values of the normalized variables mentioned above: Distance to Tefé’s urban area, Distance to the nearest urban center, Number of migrations, Number of women, children, elderly and Social Development Index | does not apply | does not apply |
Risk calculation | Multiplication of the variables hazard, exposure and total vulnerability | does not apply | does not apply |
