M. Colli

M. Colli
Artys

PhD, Fluid Dynamics and Environmental Processes Engineering
Development of advanced environmental monitoring and decision support systems for natural disaster risk management

About

44
Publications
9,145
Reads
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567
Citations
Citations since 2016
24 Research Items
539 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Introduction
Matteo Colli is a PhD in Fluid Dynamics and Environmental Engineering. Matteo does applied research in Hydrology, Computational Fluid Dynamics and Electronic Engineering applied to the environmental monitoring through opportunistic IoT sensor network. Currently, he is the CTO of Artys, a spin-off company of the University of Genoa that offers innovative solutions for environemntal risk mitigation.
Additional affiliations
March 2019 - present
Artys Srl
Position
  • CEO
March 2017 - March 2019
Università degli Studi di Genova
Position
  • Research Associate
January 2014 - February 2017
Università degli Studi di Genova
Position
  • Research Associate

Publications

Publications (44)
Article
The aero-dynamic response of snow gauges when exposed to the wind is responsible for a significant reduction of their collection performance. The modifications induced by the gauge and the wind shield onto the space/time patterns of the undisturbed airflow deviate the snowflakes trajectories. In Part I we investigate the disturbed air velocity fiel...
Article
The use of windshields to reduce the impact of wind on snow measurements is common. This paper investigates the catching performance of shielded and unshielded gauges using numerical simulations. In Part II, we investigate the role of the gauge and windshield aero-dynamics, as well as the varying flow field due to the turbulence generated by the ga...
Article
Recent studies have used numerical models to estimate the collection efficiency of solid precipitation gauges when exposed to the wind, in both shielded and unshielded configurations. The models used computational fluid dynamics (CFD) simulations of the airflow pattern generated by the aerodynamic response to the gauge/shield geometry. These are us...
Article
The accurate measurement of snowfall is important in various fields of study such as climate variability, transportation, and water resources. A major concern is that snowfall measurements are difficult and can result in significant errors. For example, collection efficiency of most gauge-shield configurations generally decreases with increasing wi...
Article
A drop counter catching-type gauge and a tipping-bucket rain intensity gauge are compared in this paper in order to investigate the performance of suitable correction algorithms. Comparison in the field is performed at the resolution of 1min by assuming the drop counter as a working reference at low to medium rainfall rates. The observed deviations...
Article
In this work, time-resolved three-dimensional numerical simulations supported by laboratory experiments aim to provide complementary information of the spray drying process, revealing pivotal details about the flow and particles dynamics. A drying model was implemented in the OpenFOAM open-source code and large-eddy simulations (LES) of the flow we...
Chapter
This chapter describes the measuring principles and technological solutions available for in-situ measurements of liquid (rain) and solid (snow) atmospheric precipitation. They can be classified into catching and non-catching precipitation gauges. Instruments belonging to the first family are generally based on gravity-related measuring principles...
Article
Full-text available
Accurate snowfall measurements are necessary for meteorology, hydrology, and climate research. Typical uses include creating and calibrating gridded precipitation products, the verification of model simulations, driving hydrologic models, input into aircraft deicing processes, and estimating streamflow runoff in the spring. These applications are s...
Article
Full-text available
Numerical studies of the wind-induced bias of precipitation measurements assume that turbulence is generated by the interaction of the airflow with the gauge body, while steady and uniform free-stream conditions are imposed. However, wind is turbulent in nature due to the roughness of the site and the presence of obstacles, while precipitation gaug...
Article
Full-text available
Correct regulation of meteoric surface and subsurface flow waters is a fundamental goal for the sustainable development of the territories. A new system, aimed at real-time monitoring of the rainfall and of the cumulated rainfall, is introduced and discussed in the present paper. The system implements a Sensor Network based on the IoT paradigm and...
Article
Adjustments for the wind-induced undercatch of snowfall measurements use transfer functions to account for the expected reduction of the collection efficiency with increasing the wind speed for a particular catching-type gauge. Based on field experiments or numerical simulation, collection efficiency curves as a function of wind speed also involve...
Article
This article compares different rainfall observing techniques available in the City of Genoa (Italy): the Ligurian regional tipping-bucket rain gauge (TBRG) network and the Monte Settepani long-range weather radar (WR) operated by the Ligurian Regional Environmental Protection Agency (ARPAL) and Smart Rainfall System (SRS), a network of microwave s...
Article
Full-text available
In operational conditions wind is the main environmental source of measurement biases for catching-type precipitation gauges. The gauge geometry induces a deformation of the surrounding airflow pattern, which is generally characterized by relevant updraft zones in front of the collector and above it. This effect deviates the trajectories of the lig...
Chapter
Globally, the risks from extreme weather are significant and increasing, mainly because larger numbers of people and their assets are being exposed to floods. To cope with such events a now-casting service would be worth to validate weather alerts and to give civil protection offices timely information on the precipitation. In this work, rain-monit...
Article
This paper describes the results obtained by the application of an innovative environmental monitoring technique able to estimate rainfall intensity in real time by processing the attenuation of microwave satellite link signal measured by low cost sensors. The satellite that has been used during our work, Turksat 42° E, belongs to the plethora of s...
Article
Full-text available
Transfer functions are generally used to adjust for the wind-induced undercatch of solid precipitation measurements. These functions are derived based on the variation of the collection efficiency with wind speed for a particular type of gauge, either using field experiments or based on numerical simulation. Most studies use the wind speed alone, w...
Conference Paper
Full-text available
This work presents the performance of an innovative environmental monitoring system-Smart Rainfall System (SRS)-that estimates rainfall in real-time by means of the analysis of the attenuation of satellite signals (DVB-S in the microwave Ku band). SRS consists in a set of peripheral microwave sensors placed on the field of interest, and connected t...
Conference Paper
Globally, the risks from extreme weather are significant and increasing, mainly because larger numbers of people and their assets are being exposed to floods. To cope with such events a now-casting service would be worth to validate weather alerts and to give civil protection offices timely information on the precipitation. In this work, rain-monit...
Article
Transparent ceramic materials may be used as optical windows, sensors, gas-tight components, etc. in specific marine applications by integration into metallic structures through joining procedures. In such systems the evaluation of galvanic effects between base alloys and compounds obtained during brazing is crucial. In this work, the galvanic beha...
Article
Full-text available
Despite the apparent simplicity, it is notoriously difficult to measure rainfall accurately because of the challenging environment within which it is measured. Systematic bias caused by wind is inherent in rainfall measurement and introduces an inconvenient unknown into hydrological science that is generally ignored. This paper examines the role of...
Article
The airflow surrounding any catching-type rain gauge when impacted by wind is deformed by the presence of the gauge body, resulting in the acceleration of wind above the orifice of the gauge, which deflects raindrops and snowflakes away from the collector (the wind-induced undercatch). The method of mounting a gauge with the collector at or below t...
Technical Report
Full-text available
The Solid Precipitation Intercomparison Experiment (SPICE) was conducted as an internationally coordinated project, initiated and guided by the Commission for Instruments and Methods of Observation (CIMO) of the World Meteorological Organization (WMO). The SPICE field experiments took place between 2013 and 2015, with a preparatory stage during the...
Article
Launched in 2011 within the European Metrology Research Programme (EMRP) of EURAMET, the joint research project "MeteoMet" – Metrology for Meteorology – is the largest EMRP consortium: National Metrology Institutes, Universities, meteorological and climate agencies, Research Institutes, collaborators and manufacturers are working together, developi...
Poster
Full-text available
An innovative environmental monitoring system - Smart Rainfall System (SRS) - that estimates rainfall in real-time by means of the analysis of the attenuation of satellite signals (DVB-S in the microwave Ku band) is presented. Such a system consists in a set of peripheral microwave sensors placed on the field of interest, and connected to a central...
Article
Full-text available
Eight rainfall events recorded from May to September 2013 at Hong Kong International Airport (HKIA) have been selected to investigate the performance of post-processing algorithms used to calculate the rainfall intensity (RI) from tipping-bucket rain gauges (TBRGs). We assumed a drop-counter catching-type gauge as a working reference and compared r...
Article
Full-text available
A number of rain events recorded from May to September 2013 at the Hong Kong International Airport (HKIA) have been selected to investigate the performance of post-processing algorithms used to calculate the Rainfall Intensity (RI) from Tipping-Bucket Rain Gauges (TBRGs). We assumed a drop counter catching-type gauge as a working reference and comp...
Article
Pluvial flooding in urban areas may derive from the limited or temporarily reduced efficiency of surface drainage, even when the underlying storm sewers are properly designed. This study focuses on the impact of uncertainties in the operational condition of the surface drainage system on pluvial flood hazard. The flood propagation model FLURB-2D is...
Conference Paper
Full-text available
The most widely used device to measure rainfall is the tipping bucket rain gauge (TBR), although there is no standard design. The precision and accuracy of TBR measurements vary, and calibration procedures are dependent upon the organisation or institution operating a network. Consequently, rainfall datasets may be heterogeneous and not easily comp...
Conference Paper
Full-text available
The liquid precipitation at the ground level is measured by means of different techniques and technologies for areal and point-scale quantification of rainfall intensity RI (mm/h) and the resulting total precipitation amount h (mm). Point-scale precipitation gauges fall in two main categories: catching type gauges, which collect the liquid equivale...
Research
Full-text available
Ph.D. Dissertation, 2014. The activity presented in this thesis work is focused on the experimental study of the ground-based precipitation measurement made by catching-type gauges in view of their wide employment in the national meteorological services. This dissertation copes with a few specific problems that systematically impact on the accurac...
Research
Full-text available
Investigation of the accuracy and precision of a modern Weighing Gauge (WG) under non steady-state reference flowrate conditions is addressed as the first objective of the present work. The preliminary development and validation of the laboratory equipment for the generation of variable time step reference flowrates is shown. The generator is chara...
Patent
La presente invenzione si riferisce ad un metodo per effettuare il potenziamento (bilanciamento, taratura dinamica e correzione in tempo reale) di un pluviometro a vaschette basculanti che viene realizzato mediante la sola rilevazione dei tempi di ribaltamento delle vaschette stesse e ad un dispositivo che realizza tale potenziamento.
Conference Paper
Full-text available
Rainfall measurement has an extensive historical precedent. Attempts have been made to standardise measurement procedures. This has never been successfully achieved. There are many sources of measurement error, some of which are compounded by poor rain gauge siting and a variation in gauge height. By far the worst cause of measurement inaccuracy is...
Conference Paper
Full-text available
The accurate measurement of solid precipitation plays a major role for water and risk management as well as climate monitoring, yet its observation is very complex and often afflicted by large uncertainties. WMO SPICE is an international coordinated assessment of the ability and reliability of automatic sensors to accurately measure solid precipita...
Article
The contribution of any single uncertainty factor in the resulting performance of infield rain gauge measurements still has to be comprehensively assessed due to the high number of real world error sources involved, such as the intrinsic variability of rainfall intensity (RI), wind effects, wetting losses, the ambient temperature, etc. In recent ye...
Conference Paper
Full-text available
The aerodynamic response of solid precipitation gauges when exposed to the wind is responsible for a significant reduction of their catching performance. This effect is known as the " exposure problem " and consists in the modification of the space/time patterns of the undisturbed airflow operated by the gauge itself or the employed wind shield, ca...
Patent
Tecnica di correzione dinamica in tempo reale delle intensità di pioggia misurate da pluviometri a pesata basata sull’ipotesi di funzionamento in termini di sistema dinamico lineare di 1° ordine, determinazione della relativa costante di tempo tramite semplici prove di laboratorio, e ricostruzione del segnale di pioggia reale.
Article
The available calibration experiences about rain intensity gauges relying on the weighing measuring principle are based on laboratory tests performed under constant reference flow rate conditions. Although the Weighing Gauges (WG) do provide better performance than more traditional Tipping Bucket Rain Gauges (TBR) under constant reference flow rate...
Article
Full-text available
Short interval snowfall, drizzle and light rainfall events can be hard to measure with precipitation gauges due to sampling limitations, wind effects, and noise. The noise observed in the data sampling can often be greater than the detectable signal from a real precipitation event. In addition wind effects can induce differential air pressure on th...
Article
Full-text available
Contextually to the ongoing Solid Precipitation InterComparison Experiment (SPICE), the WMO experimental initiative concerning solid precipitation measurement instruments, the Lead Centre "B.Castelli" on Precipitation Intensity has recently conducted laboratory investigations to test the performance of the automatic weighing type (WG) gauges under...
Article
Full-text available
The OTT Pluvio2 weighing type (WG) and the GEONOR T-200 vibrating-wire type (VWG) precipitation gauges were selected to compose the reference monitoring system of the WMO Solid Precipitation InterComparison Experiment field sites. It has been largely demonstrated in past laboratory activities how the weighing type gauges do provide more accurate pe...
Article
Full-text available
In recent years the WMO Commission for Instruments and Methods of Observation (CIMO) fostered noticeable advancements in the accuracy of precipitation measurement issue by providing recommendations on the standardization of equipment and exposure, instrument calibration and data correction as a consequence of various comparative campaigns involving...
Article
Full-text available
Measurement accuracy requirements for rainfall intensity gauges under operational use are becoming tighter after the recent Field Intercomparison of Rainfall Intensity Gauges promoted by WMO (the World Meteorological Organisation) demonstrated the achievable accuracy of a number of commercially available instruments (Vuerich et al., 2009). Various...
Conference Paper
Full-text available
Hydrologic performance of green roofs may differ in various climatic regions due to the specific precipitation climatology, building practices and green roof materials. To this aim the University of Genova recently developed a laboratory experiment by installing a dedicated test-bed. A small size green roof test bed was established at the laborato...

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Projects (2)
Project
The CIMO LC-PrIn maintains capability to perform dynamic calibration, metrological confirmation and intercomparison of rain intensity gauges in the laboratory and suitable equipment for - laboratory calibration - the traceability of its measurement standards and - measuring instruments, therefore providing support for certification of the instruments’ performance as a suitable Independent Third Party Organisation. It also maintains a set of gauges acting as a working reference for field measurements of rainfall/snow intensity. The CIMO LC-PrIn conducts research on - suitable equipment and procedures for routine field testing of network precipitation gauges which would be recommended for the standardization of field calibrations of precipitation gauges during operational use, - suitable devices and technical procedures to improve the testing capabilities following the results of the WMO Field Intercomparison of RI gauges - the interpretation of the influence of measurement errors on meteo-hydrological applications - correction procedure for historic data series - post-processing techniques for automatic correction of the measured rain intensity. The CIMO LC-PrIn has the necessary testbed and equipped facility to perform regular field measurement campaigns or international/regional comparisons with the purpose to test - the performance of different measuring principles for rainfall intensity (RI) and - the effects of laboratory calibrations mentioned above on the measured intensities. The CIMO LC-PrIn collaborates and cooperate with - relevant CIMO Expert Teams in developing guidance material - WMO regional instrument centres (RICs) and other international testbeds for the organization and participation in field tests for specific purposes or in international/regional intercomparisons; The CIMO LC-PrIn proposes: - standards on precipitation intensity measurements for consideration in WMO and ISO technical committees - reports on all significant tests to the CIMO community, through publication of IOM reports and publications in scientific journals - technical support and vocational training and periodic training courses on general and specific issues related to liquid/solid rainfall intensity measurements.