A probe rod and method for multi-parameter in-situ observation of seabed pore water based on fiber grating

Abstract

The invention relates to a fiber grating-based multi-parameter in-situ observation probe rod for seabed pore water, comprising a probe rod body and a probe rod pressure-resistant bin, and a sensor array, an underwater acoustic transducer and a watertight connector are installed on the top of the probe rod pressure-resistant bin. , The fiber multi-parameter demodulator, master control system and lithium battery are installed inside the probe rod pressure chamber, the bottom of the probe rod pressure chamber is connected to the auxiliary chamber, the auxiliary chamber is threadedly connected to the metal permeable stone, and the bottom of the auxiliary chamber is sealed with the probe body; The probe rod body includes a probe rod unit which is sealed and connected by a connector. An external seawater channel and a pore fluid channel are formed in the connector. The pore fluid channel is embedded in the pore fluid controller. The connector is equipped with a connecting metal permeable stone. An optical fiber pore water sensor is screwed on the upper end face of the piece, and a sampling bottle is screwed on the lower end face of the connecting piece for each pore fluid channel. The invention provides real and reliable observation data for monitoring and early warning of seabed geological disasters and marine engineering construction, and has important practical significance.

Description

technical field [0001] The invention relates to the technical field of seabed monitoring, in particular to a fiber grating-based multi-parameter in-situ observation probe rod and method for seabed pore water. Background technique [0002] At present, the global economic growth is slowing down, and the problems of resource depletion, ecological destruction and disappearance of demographic dividends are severe, and various countries are looking for new economic growth points. Compared with terrestrial resources, global marine resources have more development space and the technical problems of marine resource development are being solved continuously. The marine industry in the 21st century will bring important development opportunities to these coastal cities and countries. The first trial production of natural gas hydrate in Haicheng in the South China Sea was successful, the Hong Kong-Zhuhai-Macao Bridge was officially opened to traffic, the Sino-French Ocean Satellite was ...

AI Technical Summary

Problems solved by technology

However, this method disturbs the sample greatly, and the properties of pore water in the sediment inevitably change during this process, making the measurement results uninterpretable

In addition, there is a method of directly penetrating the pore water sampling probe on the seabed for sampling, but this method often has fewer samples and has the disadvantage of being unable to continuously observe

However, technical methods such as submarine CPTU testing and submarine pore pressure observation probes often use electrical sensors to sense the pore water pressure changes of seabed sediments, which have low measurement accuracy and single functions.

[0006] Therefore, on the basis of the current existing technology, it is impossible to accurately and simultaneously obtain multiple parameter change data of seabed sediment pore water. How to develop a high-precision, multi-parameter in-situ long-term observation probe and The method provides real and reliable observation data for submarine geological disaster monitoring and early warning and marine engineering construction, which has important practical significance

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