南海海底沉积物声学物理参数测定的温度和时间优化研究

摘要

Physical parameters such as water content, density and porosity of marine sediments are important for studying acoustic characteristics of sediments. Due to the complex and variety of the marine sediments in the South China Sea and precious deep-sea sediment samples, it is necessary to accurately determine the physical parameters of these sediment samples and make sure no damage to their chemical properties. However, the current measuring methods cannot meet the demands. In this study, we determined and analyzed the changing trends and characteristics of the water content, density, porosity of the clay, silt, and sand in three typical sediments with the drying time under different temperature (60, 80, 100, and 120 ℃) by using circular knives method and dryer method. The results are as follows. 1) The higher the temperature, the shorter the time of the total loss of pore water, and the periodic characteristics of the water loss process for the same type of sediment. 2) The times of typical sediments completely lose the pore water are in the order of tsand