Device and method for in-situ real-time monitoring of seabed boundary layer based on spontaneous potential measurement

Abstract

The invention belongs to the technical fields of seafloor environment observation and marine engineering geology, and relates to an in-situ real-time monitoring device and method for a benthic boundary layer based on natural potential measurement. An observation device adopted for the in-situ real-time monitoring device and method is a natural potential measurement probe, electrodes of the probe are solid-state annular reference electrodes with high stability, do not need power supply and are not affected by electrode polarization; the probe measures a potential difference value generated by natural potentials of two different substances including seawater and seafloor sediment, a seabed interface is determined according to the potential difference between every wo electrodes, and the change of the concentration of upper and lower substances of the surface of the seabed is reflected; the probe is simple in structure, the monitoring method is clear, and the monitoring accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of seabed environment observation and the technical field of marine engineering geology, and relates to an in-situ real-time monitoring device and method for measuring the seabed boundary layer based on natural potential. Background technique [0002] The seabed boundary layer is not a fixed single-phase layer. It refers to an area generated by the interaction between hydrodynamic forces and the seabed within a certain range above and below the seabed interface. This area contains both the disturbed water flow and the disturbed water below the seabed. sedimentary layer. Energy transmission and material exchange between seawater and seabed frequently occur in this layer. It is precisely because of the existence of this dynamic process that the study of the seabed boundary layer can better describe the erosion and deposition process of seabed sediments. The evolution process of erosion and deposition has impo...

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Problems solved by technology

[0003] At present, in-situ monitoring of the seabed boundary layer is mainly realized by three technologies: sound, light, and electricity. The current optical and acoustic methods can only observe changes on the seabed and above the seabed, and cannot For better observation of the sediments in the lower part of the seabed, the method of resistivity measurement can realize the function of monitoring both the upper and lower parts of the seabed, such as the dynamic observation device and method of the deep seabed boundary layer (patent number: CN201810276805. 7)

Although the above-mentioned monitoring method can realize the observation of the lower part of the seabed, its monitoring frequency and cycle are still limited by the battery capacity, and it does not solve the problem of electrode polarization in the water, and cannot accurately measure the concentration of suspended sediment in the water. In addition, it has not established The relationship between the change of the upper and lower boundary layers on the seabed and the measured parameters

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