基于边界定位法的填埋场渗漏检测

提出了以传输线模型为基础的新型填埋场渗漏检测方法,并且建立了填埋场渗漏检测的非均匀传输线模型.利用模型中边界电气量以及渗漏区域2个分界面电压连续的基本原理推导出测距方程,通过线路两端电气量的采样值,计算模型的特性阻抗和传播系数.结果表明:检测频率为30 MHz时,渗漏和未渗漏区域的衰减常数和相位常数差异性最大;同一频率下,渗漏区域的值高于未渗漏区域;特性阻抗的模值随频率增加而减小,辐角则随频率的增加而增大;测量中不同步采样对测距精度有一定影响.为提高测距精度,应选用较高的检测频率并保证两端电气量同步采样.

Landfill Leakage Detection Based on Boundary Localization Method

In this study,a new type of landfill leakage method based on a transmission line model was proposed,and a non-uniform transmission line model was constructed.The ranging equation was deduced by using the electrical parameters of the boundary and the basic principle of voltage continuity in the two boundaries of the leakage area.The characteristic impedance and transmission coefficient of the transmission line were calculated from the electric parameters of both ends.The experimental results showed that:1) at the frequency of 30 MHz,the difference of the attenuation and phase constants between the leakage and non-leakage area reached a maximum value;2) at the same frequency,the values in the leakage area were bigger than those in the non-leakage area;3) with increase of frequency,the characteristic impedance modulus decreased and the radiation angle increased;4) asynchronous sampling had some effects on measurement accuracy.Therefore,to improve the ranging precision,high detection frequency should be used,and synchronous sampling of both electrical ends should be ensured.