The Modeling Of Spatial Distribution Of Soil Mass Temperature Variation And Freezing-thawing Monitoring In Earthen Sites

With the sustainable development of cultural relics protection, as well as the continuous progress of the concept of heritage conservation, the focus of the work of heritage conservation gradually transforms from the traditional rescue protection to the protection of the heritage. The significance of protective prevention lies in the fact that, through the monitoring and control of storage environment of cultural relics, it reduces and avoids environmental destruction. At present, the main means to achieve environmental monitoring is to continuously obtain the sensor data of cultural relics and hosting environment through wireless sensor networks. However, the application of the technology in cultural relics prevention is still in an initial stage, because the monitor data lacks sufficient and deep analysis. The monitoring result is not intuitive and the effective information is also very limited, which impact on the effect of preventive protection of cultural relics. This situation is not conducive to the follow-up of the scientific research of heritage conservation.Temperature is an important factor of the weathering of soil sites, which is also one of the most common monitoring site of preventive protection. This paper applys the mathematical modeling, based on simulation test in the acquisition of a large number of wireless sensor network monitoring data, established relic soil mass temperature variation of spatial distribution model and freezing-thawing monitoring system.The model can achieve the following functions:by monitoring a small number of nodes, the temperature of the soil to obtain a cross-sectional standard deviation of the distribution of temperature of each point estimate of the standard deviation; Locate and estimate the freeze-thaw cycles soil area. The model achieves a goal to maximized use the existing environmental monitoring data and to provide an important reference for future soil site protection work. In addition, it provides technical support for further research of the mechanism of freezing and thawing of soil temperature variation.In the modeling process, first of all, the model was assumpted according to the related literatures; followed by Kriging interpolation method, software MATLAB and Surfer is used to solve the model in each of the key variables. After the completion of temperature change rate and modeling of the monitoring system of freezing and thawing were selected at random for two days as the study period, application model, the time spatial distribution model is drawn into intuitive contour map, and the change of soil temperature space distribution characteristics are summarized. Finally, through crossing validation of the model, model error analysis and results discussing are completed.The model validation and error analysis results show that The modeling of spatial distribution of soil mass temperature variation and freezing-thawing monitoring can perfectly reflect the actual situation, which can also accurately reflect the spatial distribution of temperature change and freezing-thawing region specific distribution. There are still certain errors in the value of actual temperature standard deviation and freezing-thawing area estimation. But it does not affect the practical value of these models.