单探针热脉冲法测定饱和土壤固体百分比方法研究  

Measuring solid percentage of saturated soilusing single probe heat pulse method

作　　者：韦昊延 成静清 武廉策 孔琼菊 胡优 司炳成 李敏 WEI Haoyan;CHENG Jingqing;WU Liance;KONG Qiongju;HU You;SI Bingcheng;LI Min(Key Laboratory of Poyang Lake Water Resources and Environment of Jiangxi Province,Jiangxi Academy of Water Science and Engineering,Nanchang,Jiangxi 330029,China;Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education,Northwest A&F University,Yangling,Shaanxi 712100,China;Department of Soil Science,University of Saskatchewan,Saskatoon S7N5A8,Saskatchewan,Canada)

机构地区：[1]江西省水利科学院江西省鄱阳湖水资源与环境重点实验室,江西南昌330029 [2]西北农林科技大学旱区农业水土工程教育部重点实验室,陕西杨凌712100 [3]加拿大萨斯喀彻温大学土壤系,萨斯卡通S7N5A8

出　　处：《干旱地区农业研究》2024年第4期98-106,144,共10页Agricultural Research in the Arid Areas

基　　金：江西省鄱阳湖水资源与环境重点实验室开放基金(2021SKSH07);国家自然科学基金(42307392);国家重点研发计划(2021YFD1900700)。

摘　　要：以两组不同含水率下的典型淤泥饱和态土壤—油砂尾矿土壤为例,使用两个独立的探针,基于单探针热脉冲法以及Blackwell方程,提出3种接触热导率的获取方法(H T、H K和H av方法),通过对比热脉冲法测定值与烘干法得到的真实值检验不同方法的适用性。结果表明:不同探针对各组土样的热导率、热扩散率和比热容测定结果基本一致,说明探针导致的接触热导率差异并不影响土壤热特性的测定;但在H T方法、H K方法和H av方法下,扩散率和比热容有显著差异。与烘干法相比,基于H T方法的单探针热脉冲法在不同情景下测定的油砂尾矿固体百分比具有更好的一致性和稳定性,能提供可靠的淤泥饱和态土壤干湿状况测定结果。H K方法和H av方法虽然在第1组样品中表现尚可,对第2组样品测定的准确性不高,表明对同一探针的接触热导率值进行预先标定的方法存在局限性,根据温升曲线拟合获取接触热导率值仍有必要。This study took two typical saturated soils with different moisture contents oil sand tailings soil as an example.Using two independent single probes and based on the thermal pulse method and Blackwell equation,three methods for obtaining contact thermal conductivity were proposed:H T,H K,and H av methods.The applicability of different methods was tested by comparing the values measured by the thermal pulse method with the true values obtained by the drying method.The results showed that the thermal conductivity,thermal diffusivity,and heat capacity of different soil samples measured by different single probes were basically consistent,indicating that the differences in contact thermal conductivity caused by probes did not affect the determination of soil thermal characteristics.However,there were significant differences in diffusion rate and heat capacity under the H T,H K and H av method.The single probe thermal pulse method based on the H T method had better consistency and stability in measuring the solid percentage of oil sand tailings in different scenarios compared to the drying method and can provide reliable results for measuring the dry and wet conditions of saturated soil with silt.Although the H K and H av method performed well in the first set of samples,the accuracy of the measurement results for the second set of samples was not high,indicating the limitations of pre-calibration methods for the contact thermal conductivity values of the same probe.It is still necessary to obtain the contact thermal conductivity values by fitting the temperature rise curve.

关 键 词：单针热脉冲法 饱和土壤 土壤含水率 土壤热特性 土壤固体百分比 

分 类 号：S152.8[农业科学—土壤学]