基于电阻率法的人工湿地堵塞区域探测方法

Detection method of constructed wetland clogging based on resistivity method

人工湿地污水处理技术已经得到广泛的应用,但目前对人工湿地堵塞问题,无法对堵塞区域进行精确定位。为了解决这个问题,根据潜流人工湿地结构和堵塞区域的特点,建立了长、宽、高分别为146、119和102 cm水槽物理实验模型,利用改进的高密度电阻率测井法开展了探测和定位人工湿地堵塞区域的实验研究,并结合人工湿地堵塞模型的Visual MODFLOW(VMOD)流场模拟特征,探讨了基于电阻率法探测和定位人工湿地堵塞区域的可行性。结果表明,改进的高密度电阻率测井法在电阻率探杆的电极间距不大于5 cm,供电极距D_(AB)/2不超过12.5 cm的情况下,通过绘制电阻率数据的二维和三维视电阻率等值线图,能够更好地定位高阻体的空间位置和形态。可见,利用改进的高密度电阻率测井方法可以探测和定位人工湿地高阻堵塞区域,实现堵塞区域的精确定位。

Constructed wetland for sewage treatment has been widely used,but at present,the blocked area in constructed wetland can not be accurately located.To solve the problem,according to the characteristics of subsurface flow constructed wetland structure and blocked area,a physical experimental model of a flume with length,width and height of 146,119 and 102 cm,respectively,was established.Experimental research on detecting and locating the blocked area of constructed wetland was carried out by using an improved highdensity resistivity logging method.Combined with Visual MODFLOW(VMOD)flow field simulation characteristics of the constructed wetland blocking model,the feasibility of detecting and locating the blocked area of the constructed wetland based on the resistivity method was discussed.The experimental results show that the improved high-density resistivity logging method could well locate the spatial position and shape of high resistivity body by drawing two-dimensional and three-dimensional apparent resistivity contours of resistivity data under the condition that the electrode spacing of the resistivity probe rod and the power supply distance of DAB/2 were less than 5 cm and 12.5 cm,respectively.Therefore,the improved high-density resistivity logging method can be used to detect and locate the high resistance blocked area of constructed wetland,which can realize the accurate location of the blocked area.