Ilaria Butera

Ilaria Butera
Politecnico di Torino | polito · DIATI - Department of Environment, Land and Infrastructure Engineering

About

40
Publications
2,436
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258
Citations
Introduction

Publications

Publications (40)
Article
Full-text available
Can the ensemble smoother with multiple data assimilation be used to predict discharge in an Alpine karst aquifer? The answer is yes, at least, for the Bossea aquifer studied. The ensemble smoother is used to fit a unit hydrograph simultaneously with other parameters in a hydrologic model, such as base flow, infiltration coefficient, or snow meltin...
Conference Paper
Full-text available
Regional rainfall frequency analyses are based on rain gauge data that are affected by spatio-temporal discontinuities and gaps that can significantly influence the results of the statistical analyses. Neglecting the shorter series leads to ignore an amount of information that can be essential to correctly understand the spatial variability of the...
Article
Full-text available
The dependence of rainfall on elevation has frequently been documented in the scientific literature and may be relevant in Italy, due to the high degree of geographical and morphological heterogeneity of the country. However, a detailed analysis of the spatial variability of short-duration annual maximum rainfall depths and their connection to the...
Conference Paper
L’influenza della morfologia e della quota sulla distribuzione delle piogge estreme, sebbene ampiamente documentata in letteratura, non è ancora stata analizzata approfonditamente sull’intero territorio italiano. In questo studio proponiamo alcune analisi delle relazioni fra morfologia e valori medi degli estremi annui di pioggia di durata sub-gior...
Poster
Full-text available
Italy is a mountainous country with peculiar exposure to severe rainstorms. With the aim of improving the rainstorm hazard assessment over ungauged areas, the spatial variability of the relationship between rainfall and elevation is investigated over Italy, using local linear regression analysis. The analysis focuses on annual precipitation extreme...
Preprint
Full-text available
The dependence of rainfall on elevation has frequently been documented in the scientific literature and may be relevant in Italy, due to the high degree of geographical and morphological heterogeneity of the country. However, a detailed analysis of the spatial variability of short-duration rainfall extremes and their connection to the landforms doe...
Article
Full-text available
The collection and management of hydrological data in Italy has been dealt with at national level, initially, by the National Hydrological Service (SIMN), and at regional level in the last 40 years. This change has determined problems in the availability of complete and homogeneous data for the whole country. As of 2020, an updated and quality-cont...
Article
A 2D saturated-unsaturated unsteady-flow numerical study has been carried out to analyze the behavior of levees stressed by flood events. The investigation has involved: i) simulation of the seepage process in a simplified levee over a long period of river flows; ii) the use of a synthetic design hydrograph to be utilized as an alternative to a lon...
Conference Paper
Full-text available
Water wheels are hydraulic machines that employ the water’s weight to rotate. Because of their large diameter, the rotational speeds range from 2 to 10 revolutions per minute. Such conditions require ex-pensive power take off systems. For this paper, a wa-ter wheel with an innovative power transmission was tested, showing maximum global efficiency...
Article
Full-text available
A rotary hydrostatic pressure machine (RHPM) is a hydropower converter for very low head applications (less than 2.5 m). An RHPM can be installed in straight canals, because its wheel can generate a hydraulic head as a result of the created dam effect. Some new experimental results on an RHPM are presented in this paper. Because of the asymmetric s...
Article
Full-text available
In heterogeneous porous media, transmissivity can be regarded as a spatial stochastic variable. Transmissivity fluctuations induce stochasticity in the groundwater velocity field and transport features. In order to model subsurface phenomena, it is important to understand the relationships that exist between the variables that characterize flow and...
Article
To assess spring vulnerability level, the vulnerability estimator for spring protection areas (VESPA) index has been proposed. The VESPA index method is based on the joint use of discharge, electrical conductivity, and temperature data, measured at the spring location. In this paper the VESPA index method has been examined through the analysis of o...
Article
In practical situations concerning aquifers, time and/or economic restraints often make it impossible to construct numerical models, and in these cases simple methodologies could be useful, at least for feasibility studies. In this context, the present manuscript deals with the use of a straightforward cokriging method to use data acquired from a m...
Article
Over the last decade, the increase in the costs of non-renewable energy sources and a growing environmental awareness have led research institutions and companies to show more interest in renewable energy, and that derived from hydraulic sources has been undergoing a resurgence of interest, especially concerning Small Hydropower Plants. In this con...
Article
Aim of this work is to propose a stochastic description of the leakage between two aquifers separated by a semi-permeable layer with low hydraulic conductivity. The source of uncertainty here considered is the random fluctuation of the phreatic surface of surficial aquifer, originated from random rainfall events. The study focuses on an area surrou...
Article
This work addresses the issue of recovering the release history of a pollutant injection in water distribution systems through the application of geostatistical tools. Geostatistical tools are applied to the inverse problem of recovering the release history of a pollutant injected into a water distribution pipeline network in this paper. This appli...
Article
This paper describes an innovative procedure that is able to simultaneously identify the release history and the source location of a pollutant injection in a groundwater aquifer (simultaneous release function and source location identification, SRSI). The methodology follows a geostatistical approach: it develops starting from a data set and a rel...
Article
When dealing with groundwater flows, many difficulties arise in the characterization of an aquifer and in the identification of the solute trajectories, due to the natural heterogeneity of the porous formations. Transmissivity spatial variability is the main source of uncertainty in an aquifer system in the study of two-dimensional flows and as det...
Article
In recent time a great attention is devoted to the solution of inverse problems in groundwater and, more specifically, in pollution transport. One of the main problems occurring in literature is the identification of the location of the pollutant source of the release history of the pollutant injection. Such information is deduced by the analysis o...
Article
The restoring of the pollutant release history makes use of transfer functions (TFs) usually known by analytical formulation. In many cases the computation of an analytical TF is not possible; this fact limits the application of the inverse procedures to very simple conditions or it forces to drastic simplifications of complicated problems. In this...
Article
The design conditions of a river embankment are usually computed in a steady state, in a similar way to those due to the maximum river level of an assigned return period. The seepage analysis of the water pressure that stresses the embankment, with an increase in the risk of failure owing to both static instability and piping effects, results in an...
Article
The interest in environmental issues has led great attention to the quality of groundwater. Since '90 increasing attention has been paid to the problem of recovering the release history of a pollutant because the knowledge of the pollution injection function gives information about the future pollution spread, allows a better planning of remediatio...
Article
The restoring of the pollutant release history makes use of transfer functions (TFs) usually known by analytical formulation. In many cases the computation of an analytical TF is not possible; this fact limits the application of the inverse procedures to very simple conditions or it forces to drastic simplifications of complicated problems. In this...
Article
The great interest in environmental issues has led to an attention to the quality of groundwater. Scientific efforts in groundwater flow studies have primarily focused on the flow and transport behavior and on the identification of the corresponding parameters. Since '90 increasing attention has been paid to the problem of recovering the release hi...
Article
Full-text available
In this paper the problem of recovering the temporal release history of a pollutant is approached with a geostatistical methodology that analyzes the pollutant concentration measured at a given time in the aquifer. The adopted methodology was developed by Snodgrass and Kitanidis [1997] for one-dimensional flow and transport. Here it is extended to...
Article
In this work, on the basis of the spatial concentration data available at a given time, the temporal release history of a pollutant is recovered by a geostatistical method- ology. The problem in hand belongs to the inverse problems category: in literature different approaches are proposed for their solution. The geostatistical methodology adopted i...
Article
Full-text available
The stochastic approach has been shown to be an excellent tool for the characterisation and analysis of velocity fields and transport processes through heterogeneous porous formations. The main results (linear theory) have been obtained for problems with simplified flow conditions, usually in the assumption of uniform in the average flow, but a gre...
Article
Transport of a conservative solute takes place in a heterogeneous formation of spatially variable conductivity. The latter is modeled as a random space function of stationary lognormal distribution. As a result the velocity field and the concentration are also random. Assuming that measurements of concentration of an existing plume are available, t...
Article
In this paper an attempt to evaluate, by Monte Carlo simulations, the minimum size of a plume necessary to reach the ergodic limit for spatial moments is carried out in the presence of uniform recharge (both positive and negative). The results, obtained for different degree of flow nonuniformity, are discussed and compared with the case of uniform...

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