Awards and publications

Publications in conferences and peer-reviewed journals crown exceptional investigations produced up to the standards expected in the scholarly arena

The array of contributions from Watermotion span the implementation of numerical techniques, analysis of the experimental data, and the investigation of environmental processes such as buoyant discharges and storm surges. These have been produced in the frame of both academic and consultancy assignments

Beyond the specifics, this publications record brings testimony to the ability of  • reporting in-depth studies • providing linkages to established knowledge • handling complex and rich data • applying rigorous methods • managing the refereeing process

— related citation statistics +Google Scholar
— related ↓ BibTex listing of peer-reviewed publications and reports


2010 | +Karl Emil Hilgard Hydraulic Award · American Society of Civil Engineers, Environmental Water Resources Institute

For the paper Deposition from particle-laden, plane, turbulent, buoyant jets of 2008
— related ∧quote of P. Natale


2022 | Giordano Lipari, Andrea Colagrossi
↓ Dam Break Flow Benchmarks: Quo Vadis?
+16th International SPHERIC Workshop • Catania IT • 7-9 June

Summary coming soon. The conference paper and figures are an open-access deposit in the Zenodo repository.

2022 | Pieter Roos, Giordano Lipari, Chris Pitzalis, Koen Reef, Geert Campmans, Suzanne Hulscher
↓ Storm Surges in an Idealized Tidal Channel: A Power Criterion for the Unsteady Bed Shear Stress
+NCK Days 2022 • Enschede NL • 7-9 June

Summary coming soon. The conference poster is an open-access deposit in the Zenodo repository.

2021 | Pieter Roos, Giordano Lipari, Chris Pitzalis, Koen Reef, Geert Campmans, Suzanne Hulscher
↓ Unsteady Linearisation of Bed Shear Stress for Idealised Storm Surge Modelling
Journal of Marine Science and Engineering  • 9(11)

The modelling of time-varying shallow flows, such as tides and +storm surges, is complicated by the nonlinear dependency of bed shear stress on flow speed. For tidal flows, +Lorentz’s linearisation circumvents nonlinearity by specifying a (steady) friction coefficient r based on a tide-averaged criterion of energy equivalence. However, this approach is not suitable for phenomena with episodic and irregular forcings such as storm surges.
Here, we studied the implications of applying Lorentz’s energy criterion in an instantaneous sense, so that an unsteady friction coefficient r(t) adjusts to the temporal development of natural wind-driven flows.
This new bed-stress parametrisation was implemented in an idealised model of a single channel, forced by time-varying signals of wind stress (acting over the entire domain) and surface elevation (at the channel mouth). The solution method combines analytical solutions of the cross-sectionally averaged linearised shallow-water equations, obtained in the frequency domain, with an iterative procedure to determine r(t).
Model results, compared with a reference finite-difference solution retaining the quadratic bed shear stress, show that this new approach accurately captures the qualitative and quantitative aspects of the surge dynamics (height and timing of surge peaks, sloshing, friction-induced tide-surge interaction) for both synthetic and realistic wind forcings.

2021 | Giordano Lipari, Cornelis Vuik
↓ High-resolution SPH simulations of a 2D dam-break flow against a vertical wall (collection of datasets)
Collection of datasets • 4TU Research Data

This collection contains simulations at four spatial resolutions of the benchmark solution of the 2D dam break impinging against a vertical wall used by D.D. Meringolo, S. Marrone, A. Colagrossi and Y. Liu. See “A dynamic δ-SPH model: how to get rid of diffusive parameter tuning” in Computers and Fluids, 2019, 179:334-355. The simulations implement a +Smoothed Particle Hydrodynamics methodology for weakly compressible flow.
The simulations in the individual datasets have spatial resolutions of the initial water column of 800, 1600, 3200 and 6400 particles, leading to total fluid-particle counts from 1M to 82M. The solver used is DualSPHysics 5.0 and the simulations have been performed on compute-capable +GPUs.
Weakly compressible SPH is a computationally intensive and computationally demanding technique. Obtaining high-resolution data sets can be either difficult, impractical or unaffordable for many scholars and practitioners. This collection provides data of an established benchmark usable, among other uses, for dissemination, visualisation, refined or extended `hot starts’, comparisons of behaviours and results after different parameter settings and across different solvers.

2018 | Koen Reef, Giordano Lipari, Pieter Roos, Suzanne Hulscher
↓ Time-varying storm surges on Lorentz’s Wadden Sea networks
Ocean Dynamics • 68(8) • 1051-1065

We present an idealized network model for +storm surges in the +Wadden Sea, specifically including a time-dependent wind forcing (wind speed and direction). This extends the classical work by +H.A. Lorentz who only considered the equilibrium response to a steady wind forcing. The solutions obtained in the frequency domain for the linearized shallow-water equations in a channel are combined in an algebraic system for the network. The velocity scale that is used for the linearized friction coefficient is determined iteratively. The hindcast of the +storm surge of 5 December 2013 produces credible time-varying results. The effects of storm and basin parameters on the peak surge elevation are the subject of a sensitivity analysis. The formulation in the frequency domain reveals which modes in the external forcing lead to the largest surge response at coastal stations. There appears to be a minimum storm duration, of about 3–4 h, that is required for a surge to attain its maximum elevation. The influence of the water levels at the North Sea inlets on the Wadden Sea surges decreases towards the shore. In contrast, the wind shearing generates its largest response near the shore, where the fetch length is at its maximum

— related ∧testimonial of S. Hulscher

2017 | Giordano Lipari
Storm-surge simulations: a quantitative comparison of some open-source shallow-water solvers
+4th International Symposium on Shallow Flows • Eindhoven NL • 26-28 June

Storm-surge simulations contribute key information to decisions with huge geographical coverage, future projection and socio-economical relevance. Available analytical solutions provide partial but exact benchmarks for unsteady wind-driven flows. These can be used as one means to verify the quality of numerical simulations of storm surges. This avenue has been undertaken with three mainstream flow solvers for the shallow-water equations: +AdCirc, +D-Flow Flexible Mesh, and +Telemac. The talk and summary outlined the assumptions, potentialities and outcomes of verification exercises addressing storm-surge modelling skills

2017 | Chris Pitzalis, Pieter Roos, Giordano Lipari, Koen Reef, Suzanne Hulscher
Time-dependent linearisation of bottom friction for storm-surge modelling in the Wadden Sea
+4th International Symposium on Shallow Flows • Eindhoven NL • 26-28 June

The nonlinear nature of bottom friction in shallow flow complicates its analysis, particularly in idealised models. For tidal flows, Lorentz’ linearisation has been widely applied, using an energy criterion to specify the friction coefficient. Here we propose an extension of this approach to storm surges, leading to a friction coefficient that may gradually vary over a storm event. The derivation is provided along with first results for a single channel and the network model used by Lorentz for the studies ahead of the +impoundment of the Zuiderzee

— related ∧testimonial of S. Hulscher

2016 | Koen Reef, Pieter Roos, Giordano Lipari, Suzanne Hulscher
A time-dependent network model for storm surges in the Wadden Sea
+Physics of Estuaries and Coastal Seas Conference • Scheveningen NL • 10-14 October

In the 1920s the Nobel laureate for physics +H.A. Lorentz developed a pioneering approach to quantify the increase of tide and storm surges in the outer Wadden Sea as a result of the +impoundment of the Zuiderzee with the Afsluitdijk. He solved for the attending laws of physics rather than relying on empirical formulations. To this end, he resorted to reasoned simplifications such as reproducing only storms that were relatively steady in wind speed and direction, and representing the full basin as a network of channels. A purpose-built flow solver of the University of Twente has showed that Lorentz’ approach maintains its historical merits also when the network model for the basin is used with a richer description of the storm winds. In the face of all remaining limitations, the simulation of the time evolution of the surge of the +Xaver/Sinterklaas storm (5 Dec 2013) resulted in a close agreement with measurements

— related ∧testimonial of S. Hulscher

2011 | Giordano Lipari, Peter K Stansby
↓ Review of experimental data on incompressible turbulent round jets
Flow, Turbulence and Combustion • 87(1) • 79-114

Noticeable disagreement can still be found between the available data sets of experiments in the far-field of round +jets. Hopefully this review will prove useful in guiding future experiments and numerical test cases. As of mid 2017, this contribution has been downloaded an honourable 630 times

2010 | Giordano Lipari, Jeroen Adema
↓ The generation of severe surges in the Dutch Wadden Sea: insights from data, hindcasting and numerical experiments
Storm Surges Congress 2010 • Hamburg DE • 13-17 September

The +Wadden Sea is a fringe basin of the North Sea protected by barrier islands. Only the storms managing to carry substantial amounts of water across the inlets cause severe surges. Extreme water levels do not rank in the same order as the wind speeds of such storms. Different storms of different strength can cause the same surge. Lagoon-like basins are vulnerable to a range of storms not necessarily having extreme features

— related ∧testimonial of J. Groeneweg

2008 | Alan Cuthbertson, David D Apsley, Peter Davies, Giordano Lipari, Peter K Stansby
↓ Deposition from particle-laden, plane, turbulent, buoyant jets
ASCE Journal of Hydraulic Engineering • 134(8) • 1110-1122

Less dense waters discharged in the sea for civil or industrial purposes may contain polluting sediment particles. These either drop nearby the release point or are carried up to the surface by buoyancy and fall through the water farther away. The distribution of such sediments over the sea bottom is investigated in this paper. In perspective, this study underpins potential dredging intervention for sea-bed sanitation. Paper awarded by the American Society of Civil Engineers. Downloaded 135 times as of mid 2017

— related awards

2008 | Giordano Lipari, Enrico Napoli
↓ The impacts of the ALE and hydrostatic-pressure approaches on the energy budget of free-surface flows
Computers and Fluids • 37(6) • 656-673

In a computer model for flows with a free surface, the artificial division of the water body into columns of computational cells follows the changing shape of surface and causes spurious effects in the balance expected from the physics. Also schematising water as layers simply laid one over the other has a limited applicability. Test cases show when these effects mishandle the energy that non-linear waves are expected to have

2007 | Giordano Lipari, David D Apsley, Peter K Stansby
↓ Numerical particle tracking studies in a turbulent round jet
BJ Geurts, H Clercx, WSJ Uijttewaal (eds.) • Particle-Laden Flow. From Geophysical to Kolgomorov Scales • ERCOFTAC Series, vol 11 • 207-219 • Springer

Technical paper on flow-modelling techniques. When dispersing a cloud of particles in a pre-computed flow field, the motion of the particles was eventually inconsistent with the statistics of the background flow field. Several conventional parametrisations of the random behaviour were put to the test. Other researchers have more recently defined the reasons of the discrepancies we reported on

2006 | Giuseppe Curto, Támas Krámer, Enrico Napoli, Giordano Lipari, János Józsa
↓ Large scale circulations in shallow lakes
M. Brocchini and F. Trivellato (eds) • Vorticity and Turbulence Effects in Fluid Structure Interaction • 83-104 • WIT press

The wind-driven large-scale vertical and horizontal circulation in shallow lakes are analysed upon considering the wind acceleration due to the abrupt roughness reduction from land to water. The Internal Boundary Layer (IBL) growing inside the atmospheric boundary layer causes the wind stress to curl and, together with the bathymetry changes, generates distinctive circulation patterns

2002 | Tobias Bleninger, Giordano Lipari, Gerhard H. Jirka
↓ Design and optimization program for internal diffuser hydraulics
2nd International Conference on Marine Waste Water Discharges • Istanbul TR • September 16-20

Pipelines laid on the sea bottom dispose of treated water at sea outfalls. ‘Diffusers’ (such as multiple risers and ports) enhance dilution by dividing the discharge into smaller effluxes at the release point. A model computes the variation of discharges through the ports for a range of designs. This study was preliminary to implementing the diffuser hydraulics tools in the CORMIX software

2004 | Giuseppe Ciraolo, Giordano Lipari, Enrico Napoli, Tamás Krámer, János Józsa
↓ Three-dimensional numerical analysis of turbulent wind-induced flows in the Lake Balaton (Hungary)
WSJ Uijttewaal GH Jirka (eds.) • Shallow Flows • 661–669 • Taylor & Francis

An in-house numerical solver for the unsteady, free-surface, homogeneous 3D Navier-Stokes equations has been used to investigate the response of Lake Balaton (Hungary) to synthetic wind forcing with special attention paid to the unsteady development of  recirculating patterns and water transfer processes induced by the complex topography. The eddy-viscosity profiles obtained with an algebraic model and with the standard k-ε closure are also shown. The governing equations are discretised with a finite volume method and integrated in time according to a fractional-step method

2000 | Emanuele Martino, Giordano Lipari, Anne Sanciaud-Azanza
ISBN 9788881582600 • Charta

An introduction for the art book of the photographer Emanuele Martino (1935-2010). The theme is the the sea (mare, in Italian) and its multiple manifestations. “Emanuele Martino photographs the movement of the sea, creating suggestive and meditative photos which unveil the mystery of the sea’s hidden allure”. In Italian and English. Out of print

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last edited October 2022 · authored by Giordano Lipari

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