An in-situ digital monitoring method for nonlinear dynamic process of seabed sediment resuspension

Abstract

The invention provides an in-situ digitized monitoring method for a seabed sediment resuspension nonlinear dynamic process. The in-situ digitized monitoring method comprises the steps that suspended sediment concentration inversion is conducted through seabed-based ADCPs, a probe of each ADCP serves as a signal source, and therefore space-time distribution of the suspended sediment concentration is obtained; a blind source separation technique is used for separating the suspended sediment concentration; according to the principle of nonlinear dynamics, a track of the suspended sediment concentration in a state space is reconstructed by utilizing a time series, and suspended sediment concentration information is converted into correlation dimensions, complexity, a maximal Lyapunov index and an approximate entropy nonlinear index, wherein the correlation dimensions, the complexity, the maximal Lyapunov index and the approximate entropy nonlinear index reflect the features of the nonlinear dynamics; a nonlinear trend is drawn by means of a nonlinear index of the time series and used for reflecting changes in the features of the nonlinear dynamics in the whole process. The in-situ digitized monitoring method for the seabed sediment resuspension nonlinear dynamic process realizes seabed in-situ real-time monitoring of nonlinear dynamic behaviors of changes of the suspended sediment concentration in the resuspension process, provides technical support for mechanism study in the seabed sediment resuspension process, and has the application value of establishing a suspended sediment concentration change model later and predicting the suspension and raise amount of seabed sediments.

Description

technical field [0001] The invention belongs to the technical field of marine monitoring, and relates to an in-situ digital monitoring method for seabed sediment resuspension, in particular to an in-situ digital monitoring method for the seabed sediment resuspension nonlinear dynamic process. 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 process of continuous cycle of starting, transporting, settling, resuspension, and retransportation, which is not only directly related to the change of ecological environment, the evolution of beaches, the silting of ports and waterways, material circulation, human The living space and sustainable development of society, and involves the solution of many major basic scientific problems. [0003] The widespread development of muddy coasts in my country determines...

AI Technical Summary

Problems solved by technology

Because the turbulence that causes sediment resuspension is complex and strange, they include various eddies of different sizes and shapes that flow and change with time, and involve high-dimensional problems. Traditional, linear research methods have been difficult to study sediment There have been new breakthroughs in the understanding of the mechanism of sediment resuspension. How to mine and analyze these large-capacity, high-sampling frequency observation data of suspended sediment concentration has become a bottleneck problem restricting the study of sediment resuspension, thus limiting sediment resuspension. process research

Images