Method for separating suspended sediment concentration in process of resuspension of submarine sediment

Abstract

The invention provides a method for separating suspended sediment concentration in a process of resuspension of submarine sediment. The method comprises the following steps of collecting one or a group of suspended sediment concentration time sequence observation data by utilizing a seabed base, carrying out pretreatment on the obtained mixed suspended sediment concentration observation data, separating mixed suspended sediment concentration by utilizing a blind source separation method, and carrying out character matching and identification on a suspended sediment concentration separation result to obtain the resuspension suspended sediment concentration of the submarine sediment. According to the method for separating the suspended sediment concentration in the process of the resuspension of the submarine sediment, which is disclosed by the invention, the suspended sediment concentration generated by advection and diffusion functions in suspended sediment concentration observation data can be separated, the resuspension suspended sediment concentration data is more accurate, the error of the observation result of the sediment resuspension process is reduced, a new manner is provided for the research on the sediment resuspension, and a new way is also provided for the source apportionment of multiple-source suspended sediment concentration.

Description

technical field [0001] The invention belongs to the technical field of marine monitoring, and relates to a method for separating the concentration of suspended sediment, in particular to a method for separating the concentration of suspended sediment in the resuspension process of seabed sediment. Background technique [0002] Sediment resuspension is a common phenomenon in marine processes and an important source of suspended sediment in muddy nearshore seas. Under the action of ocean dynamics, sediment is often in the continuous cycle dynamic process of starting, transporting, settling, resuspension, and retransportation. When resuspension occurs, part of the sediment enters the water body, which will inevitably lead to changes in the concentration of suspended sediment. Accurately obtain resuspension The change of suspended sediment concentration during the suspension process is the key to the study of sediment resuspension. At present, the main methods and means to stud...

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Problems solved by technology

At present, the main methods and means to study the sediment resuspension process are laboratory tank tests, on-site tank observations and on-site time-series observations of suspended sediment concentration. Due to the complexity of ocean dynamics and sedimentation processes, on-site tank observations are limited by their own working principles , the test results sometimes have large errors, and the results of the indoor tank test are difficult to apply to the field environment

Using the time series observation data of suspended sediment concentration to study resuspension requires separating the suspended sediment concentration produced by advection and diffusion from the observed data of suspended sediment concentration, but the current research cannot successfully separate the suspended sediment concentration produced by advection and diffusion. This is a key problem that has not been overcome in the study of time series observation data of suspended sediment concentration. Many researchers directly use the data of suspended sediment concentration to conduct resuspension research, ignoring advective sediment transport and suspended sediment concentration. background, resulting in inaccurate data on resuspended suspended sediment concentrations, limiting fine-grained studies of sediment resuspension processes

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