Silvia Meniconi

Silvia Meniconi
Università degli Studi di Perugia | UNIPG · Department of Civil and Environmental Engineering

PhD

About

131
Publications
32,577
Reads
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2,222
Citations
Introduction
Graduated in Environmental Engineering, University of Perugia, 2003. PhD in Civil Engineering, University of Perugia, 2006. Marie Curie fellow at the Department of Mathematics and Computer Science at the Eindhoven University of Technology - TU/e (NL), 2005-2006. 2007-2016: assistant Professor, University of Perugia.
Additional affiliations
November 2016 - present
Università degli Studi di Perugia
Position
  • Professor (Associate)
November 2007 - October 2016
Università degli Studi di Perugia
Position
  • Professor (Assistant)
Education
November 2003 - October 2006
Università degli Studi di Perugia
Field of study
  • Diagnosis of pressure pipe systems by means of transients

Publications

Publications (131)
Article
Full-text available
Climate change has a strong impact on inland water bodies such as lakes. This means that the increase in lake temperature recorded in recent decades-in Europe as well-can change the evaporation regime of the lakes. This, together with the variation of the water cycle, in particular precipitation, implies that the water mass balance of lakes may var...
Article
A stochastic approach for modeling and analysing the transients due to the users’ water consumptions in a real water distribution system is presented. The analysis is based on field measurements of water consumption at each user and pressure at three nodes, acquired at 1 min and 0.01 s time step, respectively. The hydraulic numerical model used is...
Article
The transient flow phenomenon in a pipeline accounts for the flow variations with time and space. The transient energy analysis overlooks the process as it sums the energy of the entire pipe domain and reports it at each moment. The current research takes advantage of this approach to investigate different influential factors in water pipelines, in...
Article
In this paper, criteria for the optimal and market-oriented design of the Smart-Portable Pressure Wave Maker (S-PPWM) device are presented. The outlined criteria are based on the positive results obtained both in laboratory and real systems. The S-PPWM can be used for fault (e.g., leak) detection in pressurized transmission mains (TMs) within the s...
Conference Paper
La reti di distribuzione idrica sono tradizionalmente studiate assumendo condizione stazionarie. In realtà, i sistemi di distribuzione sono continuamente soggetti a regimi transitori. Le oscillazioni di pressione risultanti possono potenzialmente causare sia danni al sistema sia problemi di qualità dell’acqua distribuita dovuti all’intrusione di co...
Article
[Personalized Share Link: https://authors.elsevier.com/a/1dAQ239%7Et0Y0UU] The widespread use of plastic pipes in different fluid conveyance systems has greatly driven the recent development and application of transient-based methods (TBMs) for leak detection in viscoelastic/polymeric pipelines. Current TBMs for viscoelastic pipe leak detection ar...
Chapter
Because of their mechanical characteristics and durability, polymeric pipes use has grown, significantly, in Water Distribution Systems replacing elastic pipes (Steel, Concrete, …). In this paper, the study of transient flows in a polymeric looped network exhibiting a specific rheological behaviour compared to elastic pipes has been carried out. Th...
Article
Full-text available
Pressurised pipe systems transport fluids daily over long distances and sediment deposits are responsible for narrowing the cross-sectional area of the pipe. This reduces the carrying capacity in gravity pipes and increases the energy consumption in rising mains. As partial blockages do not give rise to any external evidence, they are considered th...
Article
Full-text available
This paper concerns the use of Transient Test-Based Techniques (TTBTs) for fault detection in a long transmission main. It reports the results of two series of transient tests executed in a real and operating pipe system. Because of the complexity of the investigated pipeline that includes several stubs, different pressure wave generators were used...
Article
Full-text available
This paper concerns the simulation of the water table elevation in shallow unconfined aquifers where infiltration is assumed as the main mechanism of recharge. The main aim is providing a reliable tool for groundwater management, that satisfies water supply managers. Such a tool is a candidate as a physically based alternative to the use of empiric...
Article
Full-text available
In this paper the results of an experimental validation of a technique for leak detection in polymeric pipes based on the inverse transient analysis (ITA) are presented. In the proposed ITA the Nelder–Mead algorithm is used as a calibration tool. Experimental tests have been carried out in an intact and leaky high-density polyethylene (HDPE) single...
Article
Full-text available
In this paper, the transient behavior of a single-branch pipe system (Y-system) is analyzed by means of numerical experiments in which a wide range of branch characteristics (i.e., size, location, and operating conditions) is investigated. In the executed systematic analysis, focused on the role of minor branches, the pressure signals of the Y-syst...
Article
This paper presents the results of the monitoring and analysis of the dynamic behaviour of the Gorino Ferrarese (Ferrara, Italy) water distribution system. The network is subjected to ordinary operational conditions, (i.e. no manoeuvres on pumps or valves are considered), the aim being to show that user demand may generate frequent and not negligib...
Article
This paper develops a transient wave-based method to estimate the viscoelastic parameters (VEPs) of a pipe where unknown leaks may exist. The proposed method exploits the fact that the time instants at which the transient pressure signal crosses the steady-state pressure signal is independent of leaks and dependent on VEPs. It is demonstrated that...
Article
To date, the use of matched-field processing (MFP) for leak detection in pipes has been limited to cases where the mismatch between data and model is assumed to be random and Gaussian distributed. This paper extends the MFP to the more realistic case where the mismatch involves both random and modeling errors. Experimental results show that the mod...
Article
Full-text available
Plastic/viscoelastic pipes, such as polyvinyl chloride (PVC), polyethylene (PE) and high-density polyethylene (HDPE), have been increasingly used in water piping systems, which has stimulated the study of viscoelastic hydrodynamics in these pipe systems. An in-depth understanding of the pipe-wall viscoelasticity features is beneficial and necessary...
Article
Contaminant intrusion in pipelines during transients is a remarkable mechanism, which leads to a decline in the quality of the contained water. The negative pressure of water hammer pressure waves is the trigger for the suction of pollution from the surrounding leak area, and hence deteriorating water quality. The volume of contamination intruded i...
Article
In a previous paper, the authors proposed a transient-based area reconstruction method to identify multiple blockages in pipe systems without prior knowledge of their geometry and number, resulting in very accurate numerical results. In this paper, the accuracy and robustness of the method is verified in a real laboratory system in which the experi...
Article
Full-text available
The pressure damping occurring in pressurized pipes with a leak during transients has been examined as a diagnostic tool – the so-called transient damping method (TDM) – mainly from the theoretical and numerical point of view. On the contrary, the experimental data are limited to few cases. As a consequence, there is a need of an extensive experime...
Article
Full-text available
Entrapped air blocking the flow in pipeline systems is a common cause of increased pumping costs. At present, air is generally removed via valves or pipeline excavation and drilling. This becomes inefficient in large networks where the precise location of the air is unknown. Fluid transients are a potential tool for detecting and locating air in pi...
Article
Full-text available
Plastic/viscoelastic pipes such as polyvinyl chloride (PVC), polyethylene (PE) and high-density polyethylene (HDPE) pipes have been increasingly applied in fluid piping systems. The understanding of the hydrodynamic behavior and features of such pipe materials is important in their practical applications. This paper develops an effective Frequency-...
Conference Paper
Full-text available
The subsea transmission main (TM) of Trieste, Italy, plays a crucial role in the water supply system managed by AcegasApsAmga SpA (Hera Group). With the aim of implementing a systematic inspection procedure (at present divers are used for periodic surveys) AcegasApsAmga SpA decided to proceed with Transient Test-Based Techniques (TTBTs). In this pa...
Conference Paper
Water distribution networks are traditionally modelled, designed and managed assuming steady flow conditions considering at most Extended Period Simulation (EPS) approach. However, water distribution systems are actually subject to unsteady flow phenomena. The resulting pressure oscillations can potentially cause structural damage to the systems as...
Article
Full-text available
Entrapped air in pipeline systems can compromise the operation of the system by blocking flow and raising pumping costs. Fluid transients are a potential tool for characterizing entrapped air pockets, and a numerical model which is able to accurately predict transient pressures for a given air volume represents an asset to the diagnostic process. T...
Article
In recent decades transient test-based techniques (TTBTs) have been used for fault detection in transmission mains. Within TTBTs, the direct transient analysis (DTA) allows the identification of the defects directly by analysing the pressure signal. A possible DTA procedure is based on the analysis of the damping of the pressure peaks. In this pape...
Book
Full-text available
More than half of the world’s population live in cities—with an increase of 1.5 billion city dwellers in the last 20 years. The United Nations predicts that this trend will continue; it is expected that up to 6.5 billion people will be living in cities by 2050. One of the main challenges for managers and authorities is to provide an adequate qualit...
Article
Full-text available
With the aim of refining a reliable tool for groundwater management, the ERA-Interim and ERA5 global atmospheric datasets provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) are examined. Attention is focused on the analysis of the behavior of the soil moisture content. The performance of ERA-Interim and ERA5 is evaluated by...
Article
An approximate inverse scattering technique is proposed for reconstructing cross-sectional area variation along water pipelines to deduce the size and position of blockages. The technique allows the reconstructed blockage profile to be written explicitly in terms of the measured acoustic reflectivity. It is based upon the Born approximation and pro...
Article
Full-text available
This document is intended to be a presentation of the Special Issue "Advanced Hydroinformatic Techniques for the Simulation and Analysis of Water Supply and Distribution Systems". The final aim of this Special Issue is to propose a suitable framework supporting insightful hydraulic mechanisms to aid the decision-making processes of water utility ma...
Article
Full-text available
The study of transient pressure waves in both low- and high-frequency domains has become a new research area to provide potentially high-resolution pipe fault detection methods. In previous research works, radial pressure waves were evidently observed after stopping the laminar pipe flows by valve closures, but the generation mechanism and componen...
Article
Full-text available
In the last decades several reliable technologies have been proposed for fault detection in water distribution networks (DNs), whereas there are some limitations for transmission mains (TMs). For TM inspection, the most common fault detection technologies are of inline types-with sensors inserted into the pipelines-and then more expensive with resp...
Article
In this paper, the analysis of fast laminar transients in pressurized pipes is developed using a Computational Fluid Dynamics model (CFD), combined with the Zielke model and laboratory data. The systematic verification of the performance of the CFD model executed in the first part of the paper allows defining the most efficient set of the discretiz...
Article
Recent studies of measured transient pressure signals showed that eigenfrequencies shift with changes in cross-sectional area of the conduit and used this fact to develop blockage-detection algorithms. However, an understanding of the physical basis for eigenfrequency shift-based algorithms is currently lacking. This paper shows heuristically, anal...
Article
Full-text available
Climate change influences hydrological cycle with a direct effect on groundwater resources, one of the most important supply sources for human consumption and irrigation. In a scenario where General Circulation Models do not represent yet a usual tool for water industry managers, potentially the use of global atmospheric datasets is of great intere...
Article
Full-text available
The Aqualibrium competition [1] is a fun way to learn about water supply and distribution. A pipe network has to be built with the aim of equally distributing a given volume of water between three reservoirs. The rules of such a competition prescribe that a looped network has to be built and this makes the problem quite complex because of the well-...
Article
Full-text available
In this paper the possibility of using transient tests, generated by the Portable Pressure Wave Maker (PPWM) device, as a powerful tool for singularity detection, is checked in a real transmission main. During tests, small pressure waves – with an entity smaller than 1 m of water column – are injected by means of the PPWM, just upstream of the end...
Article
The aim of this paper is to investigate the complex nature of the transient energy dissipation by using a computational fluid dynamics (CFD) model with a high spatial and temporal resolution together with one-dimensional (1D) models incorporating different unsteady friction (UF) formulations. The analysis focuses on a transient event in a single pi...
Article
Eigenfrequency shift in a pipe with a blockage is investigated experimentally. The experimental test rig consists of a reservoir-pipe-valve (RPV) system that contains a single partial blockage. Blockages with different lengths are considered. The experiments confirm the existence of certain frequency bands where waves reflect strongly from the bloc...
Article
Full-text available
We have monitored the presence of bacteria belonging to the genus Legionella in the plumbing of buildings at the University of Perugia (Italy).More than 300 water samples were collected from 156 control-point taps in 41 buildings comprised in the eight campuses of the University. Legionella was absent in most samples, while it was found in only 12...
Article
A pressure reducing valve (PRV) regulates the outlet pressure regardless of the fluctuating flow and varying inlet pressure, thereby reducing leakage and mitigating the stress on the downstream water distribution network (WDN). Notwithstanding the crucial importance of PRVs, few experimental data are available in the literature. The aim of this pap...
Article
Full-text available
Pressure control strategy through Pressure Reducing Valves (PRVs) has been deeply investigated as management strategy, aimed at water leakage reduction avoiding very expensive pipe replacement programmes. On the contrary, few experimental data are available in literature, particularly in unsteady-state conditions. In this paper, the results of some...
Article
Unsteady friction and its modelling have been widely studied in transient pipe flows for its influences and modification effect on pressure waves. Such a feature is of great importance particularly in pipe systems where the extreme pressure values are due to the overlapping of pressure waves generated in different sections. This paper investigates...
Conference Paper
Full-text available
This paper investigates the presence of Legionella in the water distribution systems of buildings of the University of Perugia (Italy). Further, as the genus Legionella comprises many different species and serogroups, of which L. pneumophila sg1 is the most often associated to human lung infections, a molecular characterization of the retrieved Leg...
Article
This paper presents the results of the calibration by means of a microgenetic algorithm, using Kelvin-Voigt viscoelastic parameters, to reproduce experimental unsteady flow tests in a polymeric pipe. During the tests, different pipe lengths—which give rise to different periods of the pressure oscillations—and initial discharges have been considered...
Article
This paper analyses the mechanism of interaction between an incident pressure wave and blockages of different geometrical characteristics (i.e., a butterfly and a ball valves, two short stretches of pipe with a reduced diameter, and a device simulating a longitudinal body blockage) by means of laboratory and numerical tests. Experiments have shown...
Article
Models of water pipeline systems should take into account the distribution in space and time of user demands and leakage. In the usual approach such a distribution is simplified lumping the system outflows at a reduced number of nodes. To investigate the effects of such a simplification, in this paper we explore by numerical models, both in the tim...
Article
Full-text available
In the companion paper [1] a procedure has been presented to delineate the wellhead protection areas in the Umbria region, where a large number of minor groundwater resources are exploited. While the national and the regional regulations do not differentiate in the protection area delineation guidelines between large and small resources, the propos...
Article
Full-text available
In the Umbria region a large number of small groundwater resources is exploited to supply drinkable water to customers. More than 400 of the wells and springs managed by Umbra Acque S.p.A., one of the three Umbrian managers, draw less than 10 l/s and about 240 of them supply less than 1 l/s. The national and the regional regulations do not differen...
Article
Full-text available
In this paper, the dynamics of pressure peaks in a single viscoelastic pipe with a leak (leaky pipe) is examined by means of laboratory and numerical experiments. Experimental tests are the necessary premise to a reliable calibration of a 1-D numerical model which allows to investigate in detail a wide range of both geometrical and flow conditions...
Article
Full-text available
Molecularly oriented PVC (known as PVC-O) was developed as an improvement to conventional unplasticized PVC (or PVC-u). For a given nominal pressure, the biaxial orientation of the pipe material allows to double the tensile strength and increase flexibility and resistance to cyclic fatigue, with a reduction in weight. Although the PVC-O pipes are p...
Article
Full-text available
This contribution analyzes the implementation of two widely used literature leakage models within an advanced pressure-driven hydraulic simulation model (WDNetXL system [1]). The used leakage modelling approaches are that introduced by Germanopoulos [2] and that proposed by Van Zyl and Cassa [3] based on experimental evidences under the assumption...
Article
Full-text available
Pressure control strategy through Pressure Reducing Valves (PRV) has been deeply investigated as management strategy, aimed at water leakages reduction avoiding very expensive pipe replacement programs. On the contrary, few experimental data are available in literature, with regard to PRV transient behavior in terms of its response to incoming pres...