Guillaume Fromant

• Grenoble Alpes University

Assessing sediment stocks and transfers has become a key issue in recent decades. While the contribution of acoustic methods has led to a better understanding of sediment dynamics, through the measurement of waves and currents, the idea of using them to quantify the sediment fluxes is in full development. However, the use of these methods requires...

Sand transport predictions represent high social, economic and environmental stakes. Therefore, reliable sand transport models are needed. On a beach, either erosion or accretion can take place. Mechanisms leading to erosion are quite well known whereas accretion is less well predicted. Onshore transport occurs in the Wave Boundary Layer (WBL). Up...

Large‐scale wave flume experiments are conducted in the ripple vortex regime to study near bed coarse sand transport processes below asymmetric surface waves typical of the coastal nearshore region. For this purpose, a set of complementary acoustic instruments were deployed under regular nearshore wave conditions. Time‐resolved velocity, sand conce...

Accurate modelling and prediction of sediment transport in aquatic environments is essential for sustainable coastal and riverine management. Current capabilities rely on physical process-based numerical models and fine-scale sediment flux measurements. High-resolution hydroacoustic instrumentation has emerged as a promising tool for such measureme...

In order to improve sand transport models, the coastal engineering community needs data collected in natural conditions. In particular, sand transport processes in the wave boundary layer still need to be investigated, but the high temporal and spatial variability observed in this area makes it complicated to monitor it properly. In order to addres...

In order to improve sand transport models, the coastal engineering community needs data collected in natural conditions. In particular, sand transport processes in the wave boundary layer still need to be investigated, but the high temporal and spatial variability observed in this area make it complicated to monitor it properly. In order to address...

A novel laboratory device was developed to generate homogeneous suspended sediment concentration and to provide sufficient volume, ≈ 1 m3, for several sensors functioning simultaneously. The hydrodynamic characteristics and the functionalities of the new device were evaluated. Experiments using four types of sediments were also conducted to investi...

Acoustic scattering can be used to estimate Suspended Sediment Concentration (SSC) through acoustic inversion methods. Current SSC quantification methods are mostly unable to observe both spatial and temporal variations. Here, we assess the possibility to measure both using a Multibeam Echosounder (MBES). MBES combine a large spatial covering in th...

A novel laboratory device was developed to generate homogeneous suspended sediment concentration and to provide sufficient volume, ≈ 1 m3, for several sensors functioning simultaneously. The hydrodynamic characteristics and the functionalities of the new device were evaluated. Experiments using four types of sediments were also conducted to investi...

We present the hydroacoustic inversion tool HYDRAC. This versatile open-source software, developed in Python 3, offers the capability to read hydroacoustic data from widelyused instruments (eg. ABS, ADCP,…) and perform acoustic inversions following several advanced methods found in the literature to estimate the Suspended Particulate Matter mass co...

In the present paper, a data set of time-resolved two components velocity profile measurements under steady uniform turbulent rough clear water and sheet-flow are presented. The purpose of this campaign was to evaluate the performances of a commercial ADVP, the UB-Lab 2C from the company Ubertone, by comparing it to a well-established instrument, t...

The present study aims to extend insights of surf zone turbulence dynamics to wave groups. In a large-scale wave flume, bichromatic wave groups were produced with 31.5 s group period, 4.2 s mean wave period, and a 0.58m maximum wave height near the paddle. This condition resulted in plunging-type wave breaking over a fixed, gravel-bed, barred profi...

Wave boundary layer (WBL) dynamics are measured with an Acoustic Concentration and Velocity Profiler (ACVP) across the sheet flow‐dominated wave‐breaking region of regular large‐scale waves breaking as a plunger over a developing breaker bar. Acoustic sheet flow measurements are first evaluated quantitatively in comparison to Conductivity Concentra...

Multiphase CFD models recently have proved promising in modelling cross‐shore sediment transport and morphodynamics (Jacobsen et al 2014). However, modelling breaking wave turbulence remains a major challenge for these models, because it occurs at very different spatial and temporal length scales and involves the interaction between surface generat...

The present data have been collected during a mobile-bed experiment in the CIEM wave flume at UPC, Barcelona, during a two-month campaign (May-June 2014) as part of the STW/EPSRC-funded SINBAD project (University of Twente, University of Aberdeen, University of Liverpool, 2012-2016). The experiment focused on extending insights in sand transport pr...

Intense sediment transport experiments were performed in a gravity-driven open-channel flow with two sizes of uniformly distributed nonspherical acrylic particles having median diameters of 1.0 and 3.0 mm and a maximum packing volumetric concentration (ϕ) of 0.55. The flow conditions were adapted to each particle size to ensure similar sediment tra...

This paper shows preliminary results of experiments obtained in a large-scale wave flume under monochromatic waves plunging over a fixed bar. Velocity measurements were conducted using acoustic and optical instruments at 22 cross-shore locations ranging from the final part of the shoaling zone up to the inner surf zone. The measurements included th...

Intense sediment transport experiments were performed in a gravity driven open-channel flow with two sizes of non-spherical acrylic particles of diameter dp=1.0mm and dp=3.0 mm, and a maximum packing volumetric concentration of 0.55 m3/m3. Two flow conditions were adapted to ensure the same sediment transport regime for particle sizes as sheet flow...

The study of the suspended particulate matter (SPM) transport is essential to understanding oceans and rivers, for their presence can impact the environment, from marine habitats or water quality degradations to important changes of the seabed morphology. Among a large number of surrogate techniques in traditional water sampling, acoustical methods...

La mesure de Matières En Suspension (MES) est cruciale autant pour comprendre les transferts sédimentaires que pour les études des écosystèmes marins. Elles sont classiquement mesurées ponctuellement par des prélèvements d’eau in situ, ou à partir des propriétés optiques de l’eau. Mais depuis plusieurs décennies, les appareils acoustiques ont montr...