Table 1.
The selected indicators of the estuarine islands’ ecological vulnerability assessment index system [57,58,59,60].
| Criterion Layer | Indicator | Meaning | Positive/Negative |
|---|---|---|---|
| Pressure | Flood disaster intensity (FDI) | The extent and intensity of inundation under flood peak period. | + |
| Storm surge intensity (SSI) | The damage grade of storm surge along the coastline. | + | |
| Saltwater intrusion intensity (SII) | The extent and intensity influence by storm surge under storm surge. | + | |
| Land use intensity (lui) | The pressure of ecosystem caused by the change of land cover caused by human activities. | + | |
| State | Normalized differential vegetation index (ndvi) | NDVI indicates the state of vegetation with low vegetation cover. | − |
| Enhanced vegetation index (evi) | EVI indicates the state of vegetation with high vegetation cover. | − | |
| Net primary productivity (npp) | It indicates the degree of influence of external disturbance on ecosystem productivity. | − | |
| Landscape fragmentation (lf) | Represents the state of the ecosystem under the interference of human activities at both patch and landscape level. | + | |
| Biodiversity indicators (bi) | BI indicates the state of biodiversity under human influence. | − | |
| Soil organic matter (som) | Indicates the state of the physical and chemical properties of soil under the intrusion of salt water. | − | |
| Soil salinity intensity (SSAI) | Under the intrusion of seawater into groundwater and human intervention, under the action of strong evaporation and low rainfall washing, it represents the damaged state of soil | + | |
| Response | Ecological protection grades (EPG) | Indicates the effective managements respond to climate change and human influence. | − |
| Dam protection capabilities (DPC) | Indicates humans actions are responding to storm surge and sea level rise. | − |