Theoretical aspects and numerical modelling of the GPR method to analyse its possibilities for the detection of leakages in urban water supply networks

Pub Date : 2023-10-27 DOI:10.7494/geol.2023.49.4.357
T. Gołębiowski
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Abstract

Geophysical methods, especially selected electrical and electromagnetic ones, have been used for many years for the non-invasive detection of leakages from water supply networks. In this paper, the author focuses on theoretical aspects and numerical simulations to analyse the possibilities and limitations of the application of the selected electromagnetic method, i.e., the ground-penetrating radar (GPR) method for the aforementioned purpose. Various measurement techniques are used in the GPR method but in the paper the author refers to the most commonly used technique known as short-offset reflection profiling (SORP). As demonstrated in the paper, the detection of water leakages into a homogeneous and isotropic geological medium using the GPR method is a simple matter. However, the detection of leakages occurring in heterogeneous ground subjected to strong anthropopression and with the presence of electromagnetic interference becomes a difficult task, and interpretation may be difficult or even impossible. An important issue analysed in the paper was the phenomenon of the scattering of electromagnetic waves on underground anthropogenic objects, which very often occurs in urbanised areas. The results of the numerical modelling carried out for various scenarios of water leakages into typical ground allowed the possibilities and limitations of using the GPR method for the detection of leakages from water supply networks to be determined.
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GPR 方法的理论方面和数字模型,以分析其探测城市供水管网渗漏的可能性
多年来,地球物理方法,特别是选定的电学和电磁学方法,一直被用于对供水管网的渗漏进行非侵入式检测。在本文中,作者将重点放在理论方面和数值模拟上,以分析将选定的电磁方法,即探地雷达(GPR)方法应用于上述目的的可能性和局限性。GPR 方法中使用了多种测量技术,但作者在本文中提到的是最常用的短偏移反射剖面法 (SORP)。正如本文所展示的,使用 GPR 方法检测均质和各向同性地质介质中的漏水情况非常简单。然而,在受到强烈人为挤压和电磁干扰的异质地层中检测漏水则是一项艰巨的任务,解释起来可能很困难,甚至不可能。本文分析的一个重要问题是电磁波在地下人为物体上的散射现象,这种现象经常发生在城市化地区。通过对各种典型地下漏水情况的数值模拟结果,可以确定使用 GPR 方法检测供水管网漏水的可能性和局限性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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