AHFO-based soil water content sensing technology considering soil-sensor thermal contact resistance

扫码查看

原文链接

万方数据

外文摘要：The actively heated fiber-optic(AHFO)technology has become emerged as a research focus due to its advantages of distributed,real-time measurement and good durability.These attributes have led to the gradual application of AHFO technology to the water content measurement of in situ soil.However,all existing in situ applications of AHFO technology fail to consider the effect of soil-sensor contact quality on water content measurements,limiting potential for the wider application of AHFO technology.To address this issue,the authors propose a method for determining the soil-sensor thermal contact resistance based on the principle of an infinite cylindrical heat source.This is then used to establish an AHFO water content measurement technology that considers the thermal contact resistance.The reli-ability and validity of the new measurement technology are explored through a laboratory test and a field case study,and the spatial-temporal evolution of the soil water content in the case is revealed.The results demonstrate that method for determining the soil-sensor thermal contact resistance is highly effective and applicable to all types of soils.This method requires only the moisture content,dry density,and thermal response of the in situ soil to be obtained.In the field case,the measurement error of soil water content between the AHFO method,which takes into account the thermal contact resistance,and the neutron scattering method is only 0.011.The water content of in situ soil exhibits a seasonal variation,with an increase in spring and autumn and a decrease in summer and winter.Furthermore,the response of shallow soils to precipitation and evaporation is significant.These findings contribute to the enhancement of the accuracy of the AHFO technology in the measurement of the water content of in situ soils,thereby facilitating the dissemination and utilization of this technology.

外文关键词：

Soil water contentActively heated fiber-optic(AHFO)technologySoil-sensor thermal contact resistanceReliabilityIn situ application

作者：

Mengya Sun、Peng Wu、Bin Shi、Jin Liu、Jie Liu、Juncheng Yao、Yipin Lu、Yunqiang Wang、Xiaoyan Li

展开 >

作者单位：

School of Earth Sciences and Engineering,Hohai University,Nanjing,210098,China

School of Earth Sciences and Engineering,Nanjing University,Nanjing,210023,China

Department of Architecture and Civil Engineering,City University of Hong Kong,999077,Hong Kong,China

State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an,710061,China

展开 >

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina Postdoctoral Science Foundation

项目编号：

42307189420307012023M740974

出版年：

2024

DOI：

10.1016/j.jrmge.2024.05.009

岩石力学与岩土工程学报(英文版)

中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD

影响因子：0.404

ISSN：1674-7755

年,卷(期)：2024.16(7)