Factors Influencing the Thermal Conductivity of Silt in the Yellow River Delta

作     者：YANG Xiuqing DENG Shenggui GUO Lei ZHANG Yan LIU Tao YANG Xiuqing;DENG Shenggui;GUO Lei;ZHANG Yan;LIU Tao

作者机构：College of Oceanic and Atmospheric SciencesOcean University of ChinaQingdao 266100China College of Marine GeosciencesOcean University of ChinaQingdao 266100China Institute of Marine Science and TechnologyShandong UniversityQingdao 266237China College of Civil EngineeringAnhui Jianzhu UniversityHefei 230000China Shandong Provincial Key Laboratory of Marine Environment and Geological EngineeringQingdao 266100China Qingdao National Laboratory of Marine Science and TechnologyQingdao 266100China 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2023年第22卷第4期

页      面：1003-1011页

核心收录：

学科分类：07[理学] 08[工学] 0707[理学-海洋科学] 081501[工学-水文学及水资源] 0815[工学-水利工程] 

基　　金：The authors would like to thank the National Natural Science Foundation of China(Nos.U2006213,42277139,42207172) the China Postdoctoral Science Foundation(No.2022M712989) the Natural Science Foundation of Shandong Province(No.ZR2022QD103). 

主　　题：silt in the Yellow River Delta thermal conductivity void ratio water content temperature salinity 

摘      要：The thermal conductivity of marine sediments is an important thermophysical parameter in the study of seafloor heat flow and marine engineering construction.Understanding the effect of thermal conductivity of marine sediments in the environment has a major engineering value and theoretical significance.In this work,a modified test method was used to measure the thermal conductivity of silt in the Yellow River Delta under different void ratios,moisture contents,temperatures,and salinities.Results showed that the thermal conductivity of silt in the Yellow River Delta decreased with the increase in the void ratio and increased with the water content.Compared with sand and clay,silt in the Yellow River Delta was the least affected by the void ratio and moisture content.Under low temperatures,the heat transfer of soil was controlled by the average velocity of the phonons;therefore,the thermal conductivity of silt in the Yellow River Estuary increased with temperature.The thermal conductivity of pore water decreased with increasing salinity.Moreover,certain salinity levels resulted in a phenomenon known as the‘compressing twin electrical layer’,which led to an increase in the contact area between soil particles.With the increase in salinity,the thermal conductivity of silt in the Yellow River Delta experiences an initial decline and a subsequent increase.The proposed thermal conductivity test method is more accurate than the existing technique,and the findings provide a basis for further study on the thermal characteristics of submarine sediments.