Seabed Sediment Resistivity In Situ Measurement Technology And Application Research

Based on the special project for national ocean research in the public Interest“Chinese offshore seabed sediment acoustic survey and evaluation system research”(No. GY10-01) the research for this article was carried out. Combined with the needof Chinese offshore seabed sediment acoustics research and evaluation, this articlesystematically studied the seabed sediment resistivity in situ measurement techniques,developed micro electrode resistivity probe system and deck test and analysisinstrument for sediment resistivity, and used the instrument to experimentally studythe seabed sediment in the South China Sea and the yellow seaThe main research achievements are as follows1. This article systematically studied the direct resistivity parallel plate doubleelectrode measurement technology for sediment, measurement technology of parallelfour point probe electrode, measurement technology of annular four electrode, andanalyzed the features of their detection technology. The article detailed study theannular four electrode probe measurement technology, discussed the influence ofprobe’s structure factor on measurement results, and on the basis of predecessors’research the structure factor correction method was proposed.2. The article studied the nonlinear characteristic of the seabed sedimentresistivity and the optimized technology to overcome it, used the finite elementanalysis method to analysis the impact of probe structure factors and error correction;the intelligent fuzzy logic control method to detect and drive the signal of resistivitywas proposed, and effectively overcome the system error of the probe.3. The article developed a set of point electrode micro probe system that meet theneed of sediment resisivity in situ detection and indoor rapid determination,developed a instrument to test and analysis the virtual sediment resistivity and the testwas carried out.4. The article studied the Chinese offshore seafloor sediment porosity, moisture content and clay mineral influence on resistivity, preliminary discuss the relations ofseabed sediment resistivity and sedimentary acoustic parameters, studied theresistivity distribution features and their possible causes of seabed sediment in southchina sea and the yellow sea.The main innovation points include the following two aspects:1. In terms of the resistivity measurement, the article put forward two methods,the first is to analysis and correct the finite element for micro probe structure factorand the second is the high precision constant current source fuzzy logic controlmethod. Determined the structure factor correction coefficient of the probe, the sensorof micro resistivity in situ probe was developed.2. In terms of resistivity test, in combination with sedimentary acoustic surveyevaluation system research, the relationship of China offshore sediment resistivity,porosity and water content was preliminarily determined, and the sediment resisitivitydistribution characteristics in our country is identified for the first time.