Journal of Tropical Oceanography >
Optimization of temperature and time of acoustic physics parameters of seafloor sediment in the South China Sea
Received date: 2017-11-12
Request revised date: 2017-12-18
Online published: 2018-07-16
Supported by
National Natural Science Foundation (41376057, 41676056);National Science and Technology Support Program (2014BAB14B01)
Copyright
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<tsilt<tclay; 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
LUO Yun , HOU Zhengyu , TIAN Yuhang , XU Antao , CHEN Zhong . 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 . DOI: 10.11978/2017122
Fig. 1 Sampling locations in the South China Sea图1 取样站位图 |
Fig. 2 Ternary diagrams for classification of the sediment图2 砂、粉砂、黏土端元类型投影图 |
Tab. 1 Determination of physical parameters of sediments表1 测定的沉积物物理参数 |
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 |
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 |
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 |
南海 | - | - | - | - | - |
注: a表示文献数据来源于Chen et al, 1988; 潘国富, 2003; 卢博 等, 2005; 卢博 等, 2006b; 邹大鹏 等, 2007; 洪刚 等, 2011; 田雨杭, 2016; 田雨杭 等, 2016; b表示文献数据来源于潘国富, 2003; 卢博 等, 2006b; 邹大鹏 等, 2009、2012; Lu et al, 2010; Hou et al, 2015; 田雨杭 等, 2016; -表示数据缺省 |
Fig. 3 Temporal change of water loss of sand sediment under different temperatures图3 不同温度下, 砂沉积物失水率随烘干时间的变化 |
Fig. 4 Temporal change of water loss of silt sediment under different temperatures图4 不同温度下, 粉砂沉积物失水率随烘干时间的变化 |
Fig. 5 Temporal change of water loss of clay sediment under different temperatures图5 不同温度下, 黏土沉积物失水率随烘干时间的变化 |
Fig. 6 Temporal changes of water loss of three sediments under different temperatures图6 不同温度下, 三种沉积物失水率随时间的变化 |
Tab. 2 The sound velocity prediction deviation of critical time and total drying at 80℃表2 80℃下, 临界时间与完全烘干的声速预报偏差 |
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 |
Tab. 3 The critical time of three types of sediments under four different experimental temperatures表3 三类沉积物在4种实验温度下的临界时间(单位: h) |
沉积物类型 | 120℃ | 100℃ | 80℃ | 60℃ |
---|---|---|---|---|
砂 | 3 | 4 | 9 | 18 |
粉砂 | 9 | 16 | 30 | 60 |
黏土 | 10 | 18 | 34 | 72 |
The authors have declared that no competing interests exist.
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