SGER: Measurement of the Electrical and Dielectric Properties of Degrading Refuse for Application of Borehole Ground Penetrating Radar to Monitoring Landfill Bioreactors

0097171 Ferre本项目的目的是通过研究分解垃圾的电和介电性质与其含水量的关系，探索使用钻孔探地雷达（GPR）测量填埋场的含水量。 具体而言，使用钻孔探地雷达的含水量测量的两个关键问题将得到解决：（1）与频率相关的分解垃圾的电和介电性能的测定和（2）空间灵敏度的钻孔探地雷达方法的空间可变的电和介电性能的定义。 将进行实验室柱实验以实现第一个目标。 为了实现第二个目标，PI之前开发的分析和数值方法将被扩展，以适应钻孔GPR情况;这些分析描述将在图森市的一个运营垃圾填埋场进行为期一年的现场测试，作为历史悠久的Rio努埃沃区复垦的一部分。 生物反应器填埋场中含水量的测量和监测对填埋场的运行具有重要意义。 水太多会阻碍空气流过垃圾，从而减缓降解速度;水分不足会导致地下温度升高，反应速度降低，并可能导致地下燃烧。 依赖于测量地下水体积含量的其他环境应用包括估计自然补给、优化人工补给和土壤含水层处理作业、监测边坡稳定和隔离危险废物。***

0097171FerreThe objective of this project is to explore the use of borehole ground penetrating radar (GPR) for the measurement of water content in landfills by studying the relationship of the electrical and dielectric properties of decomposing refuse with its water content. Specifically, two key issues underlying the use of borehole GPR for water content measurement will be addressed: (1) determination of the frequency-dependent electrical and dielectric properties of decomposing refuse and (2) definition of the spatial sensitivity of the borehole GPR method to spatially variable electrical and dielectric properties. Laboratory column experiments will be conducted to fulfill the first goal. To fulfill the second goal, analytical and numerical methods previously developed by the PI will be extended to fit the borehole GPR situation; these analytical descriptions will be field tested for one year in an operating landfill of the City of Tucson as a part of its reclamation of the historic Rio Nuevo district. Better measurement and monitoring of water content in a bio-reactor landfill is important to its operation. Too much water impedes the flow of air through the refuse slowing the rate of degradation; insufficient moisture can lead to increased subsurface temperatures, reduced reaction rates and the potential for subsurface combustion. Other environmental applications dependent upon measurement of volumetric water content of the subsurface include estimation of natural recharge, optimization of artificial recharge and soil aquifer treatment operations, monitoring of slope stabilization and isolation of hazardous wastes. ***