A device and method for monitoring shallow sediment erosion and resuspension under internal wave environment

Abstract

The invention provides a device for monitoring seabed shallow sediment erosion resuspension in an internal wave environment. The device comprises a snorkeling system, an observation platform and a supporting system, the snorkeling system comprises a glass floating ball combination, a mooring rope, a subsurface buoy, a Kelvar cable and a limiting cylinder. The observation platform comprises a middle supporting rod, a stabilizing circular ring, a supporting rod, an acoustic Doppler current profiler, a sediment capturer, a circular ring with a hole, an optical backscattering turbidity meter, a battery bin, a conductivity-temperature-depth meter, a supporting plate and an acoustic Doppler velocimetry. The supporting system comprises a buffering device, a vertical supporting rod and a gravity anchor. According to the technical scheme of the invention; the device aims to directly reach the seabed to collect and obtain accurate suspended sediment concentration information on the basis of notdestroying the seabed environment. The influence of the seabed on the internal solitary wave suspended sediments is discussed; and the device is good for evaluating the suspension quantity caused by internal solitary waves and the influence on the seabed deposition process, is good for further predicting the seabed evolution, is good for accurately describing the sediment movement and improving the sediment resuspension quantity prediction level in application, and also provides a new technology and means for sediment resuspension research.

Description

technical field [0001] The invention relates to the technical field of seabed observation, in particular to a device and method for monitoring erosion and resuspension of shallow seabed sediments under an internal wave environment. Background technique [0002] Internal solitary waves are a special type of internal waves that induce significant interactions between seawater and the seafloor and have been shown to be effective contributors to sediment resuspension in shallow marine environments such as coasts, continental shelves, and estuaries. The action of internal solitary waves on the seafloor includes many complex processes. First, it exerts force on the seafloor, which in turn induces the resuspension and transport of seafloor sediments, and then leads to seafloor erosion or deposition, and has a transformation effect on the seafloor. . The seafloor bottom shape with drastic changes in internal solitary waves will enhance bottom flow velocity and bottom shear stress, ...

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in the existing technical means. For example, large technical errors in on-site water tank observation lead to inaccurate experimental data; indoor water tank tests are difficult to apply to outdoor environments due to their own conditions, so many researchers directly use indoor instrument simulation research or Putting the instrument directly in the sea layer to monitor the resuspension process destroys the sediment or hydrodynamic environment, resulting in inaccurate data on the concentration of resuspended suspended sediment, which limits the fine research on the sediment resuspension process

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