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When suffer by floods or heavy rains, the river rises and inundate its banks, so that pedestrians and vehicles wading along the river have no reference to distinguish the boundary between the banks and the water. That's a big safety hazard.
The Bank Guard is a warning green belt floating on the water. Floating greenery creates hazardous waterways and coastal access roads that alert people to avoid hazards. The Bank Guard floats near the bank of the river in tandem. Usually, it serves as an artificial floating island and purifies the water through aquatic plants. When the water rises, The Bank Guard floats to form a warning belt to warn people
Ningbo Institude of technology, Zhejiang University