Seabed sediment transport in-situ test device and use method thereof

The invention discloses a seabed sediment transport in-situ test device and a use method thereof, and relates to the technical field of marine geological disaster and sediment dynamics. A transport channel is provided with a closed channel with a downward opening; a lower end opening of the transport channel is used for being inserted with seabed sediments; a flow forming device is arranged on thetransport channel and is used for forming seabed stable laminar flow in the closed channel of the transport channel; and a reinforcing rib bracket is arranged above the transport channel and is usedfor arrangement and/or recycling and/or fixation of the transport channel. The beneficial effects of the device are as follows: the annular transport channel in an in-situ closed state is constructed,the influence of complex environments such as external surface waves and the like is blocked, and the device has huge advantages compared with an indoor simulated seabed; and the device is favorablefor promoting the transport