利用能原位矫正探针间距的TDR-热脉冲多功能探头测量土壤热特性，液态水和冰含量

TDR探针和双针热脉冲探针方法被广泛用来测量土壤热特性以及土壤水分含量。作为传统的双针热脉冲探针方法，为了减小由于探针变形而引起的测量误差，在实际应用中探针长度通常小于5厘米。而传统的TDR探针在长度小于5厘米后导致水分测量精度降低。这就造成目前能同时作为TDR探针和双针热脉冲探针使用的多功能探针无法满足实际测量需要。本研究拟解决以下问题：.（1）从理论上将基于无限线性热源近似的，双针热脉冲探针原位间距矫正方法进一步改进和完善，使之能将针体有限直径，针体热容量有限考虑在内。.（2）制作能同时作为TDR探针使用的，能原位矫正间距的多功能双针热脉冲探针，并用于室内冻土实验，得到土壤热特性以及土壤水分含量，冰含量。.（3）将能原位矫正间距的多功能探针用于野外实验，在考虑了土壤大气界面的边界条件，初始条件后用于测量得到土壤比热，液态水含量，冰含量。并和宇宙射线中子水分测量装置结果比较 。

TDR probe and dual heat pulse probe (DPHP) methods are widely used in measuring soil thermal properties and soil water content. To reduce the errors caused by probe deflection in the measurements, the traditional probe length of the DPHP is usually less than 5 cm, which will result in the decrease accuracy of measured water content. Therefore, the multi-purpose probe which combines the TDR and DPHP methods cannot match the needs of real application. In this study, we intend to solve the following problems:.(1) Based on the infinite linear heat source, to improve the self-spacing-correcting DPHP method theoretically with taking the limited diameter and heat capacity of the probe body in to account..(2)To make the multi-purpose probe which can be used as the TDR probe and self-spacing-correcting DPHP probe simultaneously and use it in the measurement of thermal properties and ice content of frozen soil in laboratory..(3)To apply the new multi-purpose probe in field to measure the heat capacity, water content and ice content values of soil,by taking the soil-atmosphere-interface boundary condition and initial condition into accounts. The results will be compared with those measured by cosmic ray soil moisture monitoring system (COSMOS).