用光纤分布式温度传感检测水基础设施中的背景泄漏:来自传热-不饱和流动模型的见解

IF 3.9 3区 环境科学与生态学 Q1 ENGINEERING, CIVIL
Andrea D’Aniello
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引用次数: 0

摘要

使用光纤分布式温度传感(DTS)来检测和定位泄漏在水利基础设施中仍处于起步阶段,尽管它具有很好的能力。只有少数实验测试了这项技术,而且这些研究都没有关注小而持久的泄漏,如背景泄漏,这些泄漏无处不在,通常无法用现有技术检测到,从而对现有水资源构成严重威胁。为了测试光纤DTS检测和定位背景泄漏的可行性,本研究详细分析了在3种不同管道缺陷配置下,在没有或有管道保温的情况下,存在与周围土壤温差小到中等的泄漏(5、25和125 L/d)的情况下,泄漏水管周围的流量和温度变化。瞬态三维传热-非饱和流动数值模拟表明,尽管管道温度对周围土壤有影响,但光纤DTS仍有可能利用温度变化来检测和定位非常小的泄漏,如背景泄漏。分析表明,在泄漏的水和未受干扰的土壤之间给定的温差下,这些变化的范围、分布和幅度以对流为主,并且可能没有必要将光纤直接放置在管道下方。事实上,位于管道两侧和底部以下的公用沟槽内的光纤表现出相当甚至更好的性能,从而也为改造现有管道提供了新的机会。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Detecting Background Leakages in Water Infrastructure With Fiber Optic Distributed Temperature Sensing: Insights From a Heat Transfer-Unsaturated Flow Model
Abstract The use of fiber optic distributed temperature sensing (DTS) to detect and locate leaks is still in its infancy in water infrastructure, despite its promising capabilities. Only few experiments tested this technology, and none of these studies focused on small but persistent leaks, like background leakages, which are ubiquitous and generally go undetected with the technology currently available, thus posing a serious threat to the available water resource. To test the feasibility of detecting and locating background leakages with fiber optic DTS, this study provides a detailed analysis on flow and temperature alterations around leaking water pipelines in presence of small leaks (5, 25, and 125 L/d) with small to moderate temperature differences with the surrounding soil, under 3 different pipe defect configurations, either in absence or in presence of pipe thermal insulation. Transient 3D heat transfer-unsaturated flow numerical simulations showed that there is potential to use temperature alterations to detect and locate incredibly small leaks with fiber optic DTS, like background leakages, despite the influence of pipe temperature on the surrounding soil. The analysis showed that extent, distribution, and magnitude of these alterations are convection dominated at a given temperature difference between leaked water and undisturbed soil, and that it may not be strictly necessary to place the optical fiber directly below the pipe. Indeed, optical fibers located within the utility trench at the sides of the pipe and below its bottom showed comparable or even better performance, thus giving new opportunities to retrofit existing pipelines as well.
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来源期刊
Water Resources Management
Water Resources Management 环境科学-工程:土木
CiteScore
7.40
自引率
16.30%
发文量
332
审稿时长
9 months
期刊介绍: Water Resources Management is an international, multidisciplinary forum for the publication of original contributions and the exchange of knowledge and experience on the management of water resources. In particular, the journal publishes contributions on water resources assessment, development, conservation and control, emphasizing policies and strategies. Contributions examine planning and design of water resource systems, and operation, maintenance and administration of water resource systems. Coverage extends to these closely related topics: water demand and consumption; applied surface and groundwater hydrology; water management techniques; simulation and modelling of water resource systems; forecasting and control of quantity and quality of water; economic and social aspects of water use; legislation and water resources protection. Water Resources Management is supported scientifically by the European Water Resources Association, a scientific and technical nonprofit-making European association.
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