Article
Environmental Sciences
Wei Shi, Paolo Peruzzo, Andrea Defina
Summary: This study focuses on the transportation of floating particles within an array of cylinders mimicking emergent vegetation stems. The experiments reveal that the probability and retention time of particle capture are mainly influenced by flow velocity, while stem density has a significant impact on the frequency of temporary captures. Prediction models for temporary capture events and their duration are proposed based on the experimental results.
WATER RESOURCES RESEARCH
(2022)
Article
Chemistry, Analytical
Junqi Yuan, Jian Feng, Sung Kwon Cho
Summary: This paper investigates the control of capillary forces acting on floating objects by manipulating the wetting properties of adjacent sidewalls. By introducing dielectrowetting and actively changing the contact angle on the sidewall, the capillary force can be easily controlled and reversed between attraction and repulsion. The tilting angle of the sidewall is identified as another critical parameter in this process, and a theoretical relation including this parameter shows good agreement with experimental results.
Article
Environmental Sciences
Juhua Luo, Guigao Ni, Yunlin Zhang, Kang Wang, Ming Shen, Zhigang Cao, Tianci Qi, Qitao Xiao, Yinguo Qiu, Yongjiu Cai, Hongtao Duan
Summary: This study presents a novel three-step classification algorithm based on Landsat imagery for the identification and monitoring of lake vegetation and algal bloom. The algorithm was validated on 22 lakes in the middle and lower reaches of the Yangtze River and applied to Landsat data from 1985 to 2021. The results show a significant decrease in lake vegetation and an increase in algal bloom in the study area, indicating an ongoing transition from a macrophyte-dominated state to a phytoplankton-dominated state.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Green & Sustainable Science & Technology
Yanhong Li, Dongliang Zhao, Guoliang Yu, Liquan Xie
Summary: The nature-based breakwater of floating emergent vegetation (BFEV) provides protection from wave erosion and promotes resilient and sustainable development in water environments. This study investigates the wave attenuation effect of BFEV through 312 physical tests in an indoor water flume, showing a wave height reduction of 38-62%. The study identifies four key parameters that influence the wave transmitted coefficient (C-t) and establishes a high correlation regression formula for C-t based on these parameters.
Article
Environmental Sciences
Wei Shi, Paolo Peruzzo, Andrea Defina
Summary: Emergent vegetation significantly influences floating particle transport and diffusion in open channel flow. A simplified Eulerian model is more cost-effective for rapid prediction compared to the Lagrangian model. The proposed Eulerian model accurately describes the dispersal and spatio-temporal distribution of floating particles within vegetated areas.
WATER RESOURCES RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Cheng Zhao, Lijun J. Cai, Min Nie, Luoran R. Shang, Yongan A. Wang, Yuanjin J. Zhao
Summary: A novel microbubble carrier inspired by the Cheerios effect has been developed for durable oral drug delivery, showing stability and controllability in product fabrication. The hollow microbubbles exhibit behavior similar to Cheerios, floating in gastric juice, adhering to the stomach wall, and enhancing drug absorption. In a proof of concept study, dexamethasone-loaded hollow microbubbles were shown to remain suspended in the stomach of mice for over 1 day, demonstrating good therapeutic effect in treating lupus erythematosus. The microbubble floating system is believed to have important values in long-term oral administration.
Article
Biochemical Research Methods
Roberto Pioli, Miguel Angel Fernandez-Rodriguez, Fabio Grillo, Laura Alvarez, Roman Stocker, Lucio Isa, Eleonora Secchi
Summary: This new microfluidic platform utilizes capillary forces to deposit individual particles into traps microfabricated onto a substrate, allowing for the generation of desired spatial layouts of colloidal particles. The platform can create various patterns and easily allows surface functionalization of trapped particles, demonstrating an easy-to-build platform for use in microfluidics labs.
Article
Engineering, Chemical
Annabel Bozon, Lennart Fries, Jana Kammerhofer, Laurent Forny, Gerhard Niederreiter, Stefan Palzer, Agba D. Salman
Summary: Food powder reconstitution is often compromised by powder floating, which affects the quality of food products. This study analyzed the floating behavior of soluble particles and partially coated beads, revealing that the duration of floating is influenced by various factors, including initial floating position, immersion, and dissolution velocity. Further research is needed to fully understand the complex mechanisms involved in powder floating.
Article
Engineering, Chemical
Annabel Bozon, Lennart Fries, Jana Kammerhofer, Laurent Forny, Gerhard Niederreiter, Stefan Palzer, Agba D. Salman
Summary: Research investigated the influence of surface heterogeneity on particle floating, revealing a dynamic floating phase caused by gradual depinning; steady-state floating is achieved when pinning is sufficiently pronounced; surface heterogeneities complicate theoretical predictions of particle floating.
Article
Engineering, Geological
Guoqing Cai, Yi Liu, Annan Zhou, Jian Li, Rui Yang, Chenggang Zhao
Summary: A temperature-dependent WRC model is developed in this study, considering both adsorption and capillarity. The proposed model shows good agreement between predicted and measured temperature-dependent WRCs. The main differences between different types of soils lie in the temperature effects on adsorption, which are represented by the parameter alpha.
Article
Geosciences, Multidisciplinary
S. Huang, J. Q. Yang
Summary: Vegetation increases the rate of hyporheic exchange by a factor of four at the same flow velocity. Turbulent kinetic energy is a better metric than flow velocity for predicting hyporheic exchange in regions with vegetation.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Energy & Fuels
Yafei Qiao, Angelica Tuttolomondo, Xingbang Lu, Lyesse Laloui, Wenqi Ding
Summary: This paper introduces a novel soil-water retention curve model that considers two different mechanisms of water retention - capillarity and adsorption - and their evolution with soil fabric along a generalized stress path. The model is justified against experimental evidence and incorporates specific water retention models for capillary and adsorption mechanisms, as well as a new parameter to relate them to experimentally determinable water retention curve. It is shown that the adsorptive mechanism is crucial in high suction range, while capillarity plays an important role in low suction range, with the developed capillary water retention curve allowing to interpret shear strength data under different saturation conditions.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2021)
Article
Biodiversity Conservation
Douglas Monteiro Cavalcante, Maria Tatiane Leonardo Chaves, Gabriella Moreira Campos, Jose Ramon Barros Cantalice, Genival Barros Junior
Summary: This study investigated the impact of flexible vegetation elements of Ipomoea pes-caprae species on water flow and sediment transport capacity. Results showed that aquatic vegetation directly influences river dynamics, with vegetation density having an impact on flow transport capacity. As the vegetation drag coefficient increases, it enhances the resistance to flow and reduces sediment transport capacity.
ECOLOGICAL INDICATORS
(2021)
Article
Environmental Sciences
Henri R. Sanness Salmon, Lucia J. Baker, Jessica L. Kozarek, Filippo Coletti
Summary: Understanding the transport of floating particles in streaming waters is crucial for predicting plastic pollution. This study investigates the motion of different-shaped and sized particles on the turbulent free surface of a meandering stream. The results show that larger particles exhibit similar velocities as tracers but have a more time-correlated motion and faster spreading rate.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Henri R. Sanness Salmon, Lucia J. Baker, Jessica L. Kozarek, Filippo Coletti
Summary: Understanding the transport of floating particles in streaming waters is crucial for predicting the spread of plastic pollution. This study investigates the motion of different-shaped and sized particles on the turbulent free surface of a meandering stream. The results show that larger particles have similar velocities to tracers but filter out extreme turbulent accelerations, leading to more time-correlated motion and faster spreading rates.
WATER RESOURCES RESEARCH
(2023)
Article
Clinical Neurology
Pierluigi Longatti, Alessandro Fiorindi, Paolo Peruzzo, Luca Basaldella, Francesca Maria Susin
JOURNAL OF NEUROSURGERY
(2020)
Article
Environmental Sciences
Riccardo Alvise Mel, Daniele Pietro Viero, Luca Carniello, Luigi D'Alpaos
Article
Water Resources
Riccardo A. Mel, Daniele P. Viero, Luca Carniello, Luigi D'Alpaos
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2020)
Article
Marine & Freshwater Biology
Riccardo A. Mel, Daniele P. Viero, Luca Carniello, Andrea Defina, Luigi D'Alpaos
Summary: The closure of the Venice Lagoon in October 2020 for the first time in history due to the Mo.S.E. system's operation not only prevented flooding but also led to unprecedented hydrodynamic scenarios. The closure facilitated a better understanding of wind effects on tide propagation, as well as the evaluation of gate operations' impact on seaward disturbance and infiltration into the lagoon.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Engineering, Civil
Tommaso Lazzarin, Daniele P. Viero, Daniela Molinari, Francesco Ballio, Andrea Defina
Summary: In this paper, a physics-based method for assessing flood damage is proposed. A non-dimensional impact parameter is introduced to combine water depth and flow velocity, which allows for evaluating relative damage functions for items of different nature. This method provides an understandable assessment of flood hazard even with limited data.
JOURNAL OF HYDROLOGY
(2022)
Article
Multidisciplinary Sciences
Davide Tognin, Alvise Finotello, Andrea D'Alpaos, Daniele P. Viero, Mattia Pivato, Riccardo A. Mel, Andrea Defina, Enrico Bertuzzo, Marco Marani, Luca Carniello
Summary: Coastal flooding prevention measures, such as storm-surge barriers, are widely adopted globally due to rising sea levels. However, their effects on shallow tidal embayment morphodynamics are poorly understood. Field data and modeling results from the microtidal Venice Lagoon reveal that artificial reduction of water levels leads to increased sediment resuspension and decreased salt marsh accretion.
Article
Water Resources
Tommaso Lazzarin, Daniele P. Viero
Summary: In this study, helical flow secondary currents are included in a two-dimensional depth-averaged hydro-morphodynamic model to analyze the flow field and bed evolution near bends. Different methods are compared in terms of their impact on the flow field and bed evolution using data from laboratory experiments and real-world case studies. The study also discusses key factors in secondary flow modeling, such as implementation tricks and mesh design guidelines.
ADVANCES IN WATER RESOURCES
(2023)
Article
Geosciences, Multidisciplinary
A. Ielpi, D. P. Viero, M. G. A. Lapotre, A. Graham, M. Ghinassi, A. Finotello
Summary: River meandering controls the age of floodplains through the formation of oxbows, while the spacing and timescales of bend evolution and abandonment can be used to constrain the distribution of floodplain ages and sediment-storage time. This approach applies to both natural and simulated rivers, suggesting its potential applicability to unconfined meandering rivers in other locations. However, further testing with independent geo- or dendrochronological data is required.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Civil
Tommaso Lazzarin, Daniele P. Viero, Daniela Molinari, Francesco Ballio, Andrea Defina
Summary: Commonly adopted procedures for flood damage assessment have limitations in describing the time evolution of hazard and exposure during the flood event. This study proposes a new framework that considers how flood damage evolves in time, showing potential for flood risk assessment and management.
JOURNAL OF HYDROLOGY
(2022)
Article
Mechanics
Tommaso Lazzarin, Daniele Pietro Viero, Andrea Defina, Luca Cozzolino
Summary: The present paper focuses on two unresolved issues in the free orifice flow under vertical sluice gates: flow stability at large gate openings and the determination of multiple solutions in the case of partial dam-break. Through laboratory experiments and numerical simulations, utilizing a computational fluid dynamics model with the volume of fluid method, these interconnected problems are investigated. A series of quasi-steady states is utilized to determine the threshold of relative gate openings for the transition from orifice flow to non-interacting flow. Furthermore, dam-break experiments with partial gate opening are conducted to establish reliable criteria for disambiguating multiple exact solutions provided by the one-dimensional shallow water theory.
Article
Mechanics
Daniele Pietro Viero, Tommaso Lazzarin, Paolo Peruzzo, Andrea Defina
Summary: The study proposes and discusses a theoretical approach to predict the behavior of open-channel supercritical flow passing over a non-orthogonal step. A sequence of oblique shock waves and expansion fans is generated near and downstream of the step. The proposed model is validated by comparing with a numerical model. Applications include using oblique steps and abrupt wall deflections to control wave fronts in channel bends. Special attention is given to the transition from supercritical to subcritical flow over a forward-facing step, which exhibits complex solutions and hysteresis effects. The theoretical and numerical models determine the existence and hysteresis domains of different flow configurations.
Article
Environmental Sciences
T. Lazzarin, G. Constantinescu, L. Di Micco, H. Wu, F. Lavignani, M. Lo Brutto, D. Termini, D. P. Viero
Summary: The present study investigates the impact of bed roughness on flow and turbulence structure around an isolated, partially-buried mussel. The results show that increasing bed roughness amplifies turbulence kinetic energy in the near-wake region and weakens the strength of the main downwelling flow.
WATER RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Tommaso Lazzarin, Andrea Defina, Daniele Pietro Viero
Summary: The present work aims to assess the change in flood risk over time due to landscape modifications. The town of San Dona di Piave (Italy) is used as a case study, as it has experienced significant urbanization and anthropization in recent decades, similar to other floodplains in Northern Italy. Flood damage to residential buildings is used as a proxy for flood risk. The analysis is conducted at a local scale, considering changes to individual buildings, and utilizes GIS data such as high-resolution topography, technical maps, and aerial images to track the evolution of the landscape in terms of urbanized areas and hydraulic structures. A physics-based hydrodynamic model is used to determine flood hazard, while an innovative method is employed to estimate the expected flood damage to residential buildings. The findings demonstrate the detrimental effect of urbanization on flood risk, with the risk increasing in proportion to the extent of urbanized areas. The study also highlights the time evolution of flood damage within individual flood events, reflecting changes in the flooding process. Overall, this research offers a promising technique for analyzing the effects of past landscape changes on flood risk, and provides a valuable tool for informed and sustainable land planning.
Article
Biotechnology & Applied Microbiology
Luigi Di Micco, Giulia Comunale, Stefano Bonvini, Paolo Peruzzo, Francesca Maria Susin
Summary: The study proposes a combined in-vitro and in-silico approach to estimate the distensibility of a deformable aorta replica. The dynamics of an aortic silicone arch were analyzed under physiological working conditions through a pulse-duplicator experiment and a Fluid-Structure Interaction simulation. The results suggest that the estimation of local distensibility from in-silico tests is reliable, overcoming the limitations of experimental methods.
BIOENGINEERING-BASEL
(2022)
Article
Biotechnology & Applied Microbiology
Giulia Comunale, Luigi Di Micco, Daniela Paola Boso, Francesca Maria Susin, Paolo Peruzzo
Summary: The choice of material and geometry for aortic replicas significantly affects the dynamics of the aorta, with the parametric geometry exhibiting a similar strain field to the patient-specific model with biological tissue. The flow velocity distribution is greatly influenced by local geometry, but plays a minor role in the arch's helicity.
BIOENGINEERING-BASEL
(2021)
