Optimal site selection
Target fishery of reefs
Artificial reefs for fish: Water depth 15~70m
Artificial reefs for shellfish and algae: Water depth 5~15m
Artificial reefs for marine forest plants: Water depth 1~15m
Subjects and criteria of artificial reefs suitability assessment [Based on Instruction No.86「Regulations on the execution and management of artificial reef projects」 of the Ministry of Oceans and Fisheries]
| Subject of investigation | Method of investigation | Criteria of suitability assessment |
|---|---|---|
| Water depth | Measured through an echo sounder and MBES |
Areas with a water depth below 70m, where the artificial reefs are safe from collapsing from typhoons and storms |
| Dissolved oxygen(mg/L) | Surface layer and bottom layer measured separately | Above 5mg/L |
| ph | " | 6.5~8.5 |
| Flow velocity | Measured through a hydrometer | Maximum flow velocity below 2m/s |
| Seafloor topography | Measured through SSS and MBES | Flat sea area with a slope under 5/100 |
| Form of substratum | Particle size analysis or investigation on the earth pressure and internal force of the soil, to prevent the artificial reef from collapsing | In case the content of muck soil or mud is above 70%, the safety factor is determined based on the geological assessment and the calculation of the earth pressure and internal force caused by stratum and core sediments. |
|
Algae (Reefs for shellfish, algae, and marine forest plants only) |
Investigation of inhabitation of algae (Quadrat investigation, investigations on photosynthesis rate and quantity of light distribution) |
Based on investigation and analysis on photosynthesis rate quantity of light distribution in algae habitats |
| Environmental pollution | Field confirmation | An area free from environmental pollution |
Reinforced conditions of the suitability assessment: Extension of investigation items
Biological factors: Distribution, movement, live food of target organism
Physiochemical factors: Water environment of the habitat, physical ocean environmental factors such as the waves and flow of water
Engineering factors: Structure, type, optimal allocation, construction method of the artificial reef
Structure of fishery, utilization status of the fishing ground (Reflect the opinions from fishermen)
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