Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 103 for “"water distribution systems"”.
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Bursts identification in water distribution systems
… the identification of burst locations in water distribution systems (WDS) by analysis of field and simulation experimental data. This required the development of a new hybrid method of burst detection and sizing, and also a burst location identification algorithm. Generally, existing …
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Global optimization of water distribution systems
… procedure GLOBAL for the global optimization of water distribution systems is presented. The procedure identifies an optimal tree layout for the network and augments it with loop forming links to assure reliability. Thus, the chosen optimal layout in judiciously subjected to various flow …
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Modelling water quality for water distribution systems
Maintaining water quality in distribution systems has become a prominent issue in the study of water networks. This thesis concentrates on disinfectant and particle counts as two important indicators of water quality. The models discussed in this work are based on data collected by the author. The …
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Cavitation and Bubble Formation in Water Distribution Systems
… gas are not directly relevant to natural water systems and require a redefined cavitation inception number which considers dissolved gases. In a pressurized water distribution system, classical cavitation is only expected to occur at extreme negative pressure caused by water hammer or at …
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Pressure, leakage and energy management in water distribution systems
… problem represents the total cost of water treatment and pumping energy. Developed network scheduling algorithm consists of two stages. The first stage involves solving a continuous problem, where operation of each pump is described by continuous variable. Subsequently, the second …
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A Model for Determining Leakage in Water Distribution Systems
… cause significant problems for utilities and water users in terms of lost revenue and interrupted service. In many cities the leakage is as high as forty percent. A water audit is carried out to assess system-wide leakage. However, to detect leakage at the level of a pipeline, a physical …
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Head-dependent modelling and optimisation of water distribution systems
The construction, operation and maintenance of water distribution systems (WDSs) involve a huge capital investment and it is essential to design and manage them in a cost effective way. The optimisation approaches (e.g. evolutionary algorithms) for optimal design or operation of WDSs require …
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Chlorine dioxide and by-products in water distribution systems
… and/or a post-disinfectant in several water treatment plants in the United States. Chlorine dioxide is associated with its byproducts chlorite and chlorate. Chlorine dioxide, chlorine, chlorite and chlorate were sampled in four distribution systems where chlorine dioxide is used for …
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Optimal design of municipal and irrigation water distribution systems
… Forces and moments tests, surface pressure distribution measurements as well as the surface pressure fluctuations, and mini-tuft flow visualization tests were made to document the flow characteristics on the surface of the body with an artificial boundary layer trip.
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Cyber-Physical Attacks and Detection Methods in Water Distribution Systems
… Internet of Things (IoT) devices to increase water management efficiency and enhance water quality services. However, the limitations of IoT devices, such as small sizes and poor security, weaken the Water Distribution System (WDS) security and many attackers compromise the critical components …
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Biostability In Drinking Water Distribution Systems Study At Pilot-scale
… were investigated for 18 months in 18 pilot distribution systems, under various water quality scenarios. This study specifically investigated the impact of steady-state water changes on HPC levels in chlorinated and chloraminated distribution systems. Chlorination was more effective than …
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Water Quality Variations During Nitrification In Drinking Water Distribution Systems
… documents the relationship among the major water quality parameters during a nitrification episode. Nitrification unexpectedly occurred in a chloraminated pilot drinking water distribution system practicing with a 4.0 mg/L as Cl2 residual dosed at 4.5:1 Cl2:NH3-N. Surface, ground and sea …
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Accumulation of Lead by Biofilms in Drinking Water Distribution Systems
… MI, indicate that lead exposure from drinking water is a major health concern in the United States. Over six million lead service lines are still in use in the United States, and a universal protocol to safely remove these lead service lines from drinking water distribution systems has not yet …
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Detection and Localization of Pressure Transients in Water Distribution Systems
Water distribution systems are critical to urban water supply, but as they age they become increasingly vulnerable to bursts and leaks, leading to significant economic, social, and environmental consequences. The complexity and inaccessibility of underground pipelines present substantial challenges …
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An Optimal Pipe Replacement Scheduling Model for Water Distribution Systems
While the idea of critical break rate of water distribution pipeline (defined as the break rate after which it is no longer economical to continuously repair) has been accepted in the literature and among the practicing engineers, the formula to obtain the critical break rate has remained elusive. …
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Evaluation of Iron Corrosion Release Models for Water Distribution Systems
Customer complaints of red water problems remain to be a frequent occurrence for water utilities. While material sources may vary, it is generally accepted that iron rust resulting from corrosion of iron based pipes is the predominant cause of red water issues. Recent efforts have lead to the …
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Fate of Salmonella Typhimurium in biofilms of drinking water distribution systems
The propensity of Salmonella to persist in water environments under unfavourable conditions is of concern as these water environments serve as contamination reservoirs. The role of contaminated water in the transmission of Salmonella in developing countries is largely unknown. The fate and …
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