(a) Observation points (St.1 and St.2) are indicated by black squares. (b) Observations were conducted from 2017 to 2018; the water quality (WQ) system performed continuous measurement for approximately one year, while the sediment trap (ST) system was installed for 55 days to measure the amount of sinking particles. (c) Resuspension of seabed sediments was the primary origin of the particles in the high-turbidity layer.