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

doi:10.11978/2017122

Abstract

Abstract:

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 t_sand<t_silt<t_clay; and at different time periods, the rate of pore water loss is quite different, which is mainly related to the particle size, the gap between particles and the loss of moisture contained in sediments in the later stage of drying. 3) The drying temperature of 80℃ is advisable, if the sediments is also needed for further comprehensive utilization and analysis, and the reference time and critical time are calculated for the complete drying of the three sediments. 4) Physics parameter of the critical time generation into the experience equation for velocity prediction is feasible at 80℃.

Key words: South China Sea, marine sediment, physical parameter, temperature, time

CLC Number:

P736.211

Yun LUO, Zhengyu HOU, Yuhang TIAN, Antao XU, Zhong CHEN. Optimization of temperature and time of acoustic physics parameters of seafloor sediment in the South China Sea[J].Journal of Tropical Oceanography, 2018, 37(4): 81-88.

Figures/Tables 9

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References 36

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沉积物类型		湿密度/(g•cm^-3)	干密度/(g•cm^-3)	含水率/%	比重	孔隙度
砂	本文	2.04	1.58	29.5	2.64	0.403
砂	南海^a	1.68~2.02	1.12~1.64	19.3~54.8	-	0.362~0.800
粉砂	本文	1.48	0.64	132.3	2.69	0.762
粉砂	南海^b	1.33~1.67	0.55~1.02	61.4~156.0	-	0.607~0.868
黏土	本文	1.41	0.52	170.1	2.72	0.808
黏土	南海	-	-	-	-	-

沉积物类型	失水率/%	含水率偏差/%	孔隙度偏差/%	公式(1)偏差/%	公式(2)偏差/%	公式(3)偏差/%	公式(4)偏差/%	公式(5)偏差/%	公式(6)偏差/%	公式(7)偏差/%	公式(8)偏差/%	公式(9)偏差/%
砂	99.12	1.02	0.97	0.13	0.29	0.25	0.29	0.29	0.29	0.26	0.12	0.18
粉砂	99.29	2.34	0.55	-1.74	-0.02	0.07	0.00	-0.02	0.04	-0.07	-0.04	0.13
黏土	99.30	-0.55	-0.12	0.68	0.02	-0.01	0.01	0.02	0.00	0.03	0.02	-0.02

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Optimization of temperature and time of acoustic physics parameters of seafloor sediment in the South China Sea

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