基于探地雷达的水库坝基渗漏正演模拟  

Forward modeling of seepage of reservoir dam based on ground penetrating radar

作　　者：吴学礼[1,2] 贾江波[1,2] 孟凡华[1,2] 李素康 张浩浩[1,2] 

机构地区：[1]河北科技大学电气工程学院,河北石家庄050018 [2]河北省生产过程自动化工程技术研究中心,河北石家庄050018 [3]石家庄市佳信电气有限公司,河北石家庄050018

出　　处：《河北科技大学学报》2017年第4期389-394,共6页Journal of Hebei University of Science and Technology

基　　金：石家庄市科技攻关项目(141131371A)

摘　　要：水库坝基渗水将带来溃堤的风险,造成水资源浪费及生命财产的损失,针对现有技术无法确定坝体渗水洞坐标的实际情况,提出采用探地雷达对坝体进行日常检测。利用时域有限差分法(FDTD)对在二维空间进行FDTD按照Yee氏网格离散处理的原理,得到其电磁分布方程,基于水库坝基的实际构造,建立了空气层、混凝土层、黏土层及两个渗水洞的理想模型,并依据理想模型建立了带有石灰岩干扰点的混凝土层干扰模型。利用MATLAB实现系统架构,并进行正演模拟。结果显示:探地雷达可以用于较深目标体探测,通过改变探地雷达电磁波中心频率,并对比50,100和200MHz三种频率雷达电磁波的检测频谱,又对带干扰模型进行了模拟,验证了100MHz频率雷达电磁波,用于复杂地形的检测效果更优。The risk of the reservoir dam seepage will bring the waste of water resources and the loss of life and property.The ground penetrating radar（GPR）is designed as a daily inspection system of dams to improve the existing technology which can＇t determine the actual situation of the dam seepage tunnel coordinates.The finite difference time domain（FDTD）is used to solve the Yee＇s grids discreatization in two-dimensional space,and its electromagnetic distribution equation is obtained as well.Based on the actual structure of reservoir dam foundation,the ideal model of air layer,concrete layer,clay layer and two water seepage holes is described in detail,and the concrete layer interference model with limestone interference point is established.The system architecture is implemented by using MATLAB,and the forward modeling is performed.The results indicate that ground penetrating radar can be used for deep target detection.Through comparing the detection spectrum of three kinds of fre-quency electromagnetic wave by changing the center frequency of the GPR electromagnetic wave of 50 MHz,100MHz and 200 MHz,it is concluded that the scanning result is more accurate at 100 MHz.At the same time,the simulation results of the interference model show that this method can be used for the detection of complex terrain.

关 键 词：空间物理探测 探地雷达 水库大坝 Yee网格 正演模拟 

分 类 号：P225.1[天文地球—大地测量学与测量工程]