Experimental study on variation of thermal conductivity of superficial submarine soils

HE Xutao; LIN Xiaobo; XU Jianliang; LI Shiqiang; YANG Jinghe; XU Haining

doi:10.3969/j.issn.1001-909X.2020.01.003

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Journal of Marine Sciences ›› 2020, Vol. 38 ›› Issue (1) : 20-26. DOI: 10.3969/j.issn.1001-909X.2020.01.003

Experimental study on variation of thermal conductivity of superficial submarine soils

HE Xutao¹, LIN Xiaobo¹, XU Jianliang¹, LI Shiqiang¹, YANG Jinghe², XU Haining¹

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Abstract

From the continental shelf at the east of Hangzhou Bay, 28 sample columns were acquired. The thermal conductivities of soils at different depths (0.2 m,1.0 m and 1.8 m) from these cores were tested by thermal probe. Correspondingly, particle size of the soils were also tested. Through the comparison between six kinds of soils in the study area, It was found that those with higher sand content (>10%) have bigger thermal conductivities. Besides, water content and dry density have significant effect on thermal conductivities of certain type of soil. Average value of thermal conductivity for superficial soils in Hangzhou Bay area,mixed deposit area and shelf sandy area are respectively 1.25 W·m^-1·K^-1, 1.45 W·m^-1·K^-1 and 1.46 W·m^-1·K^-1, which indicates that thermal conductivities increase from the coast to open waters. On the other hand, vertical variation of thermal conductivities shows that spatial factors including water depth and buried depth have no direct effect on the thermophysical properties of seabed soils.

Key words

marine soils / thermal conductivity / sand content / spatial distribution

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HE Xutao, LIN Xiaobo, XU Jianliang, LI Shiqiang, YANG Jinghe, XU Haining. Experimental study on variation of thermal conductivity of superficial submarine soils[J]. Journal of Marine Sciences. 2020, 38(1): 20-26 https://doi.org/10.3969/j.issn.1001-909X.2020.01.003

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