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Ulrich Lemmin

Cette personne a quitté l’EPFL

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Publications associées (66)

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Unconfined Plunging of a Hyperpycnal River Plume Over a Sloping Bed and Its Lateral Spreading: Laboratory Experiments and Numerical Modeling

David Andrew Barry, Koen Blanckaert, Ulrich Lemmin, Haoran Shi

Hyperpycnal (negatively buoyant) river inflow into lakes and oceans often develops three-dimensional (3D) plunging flow patterns when laterally unconfined. To determine the 3D flow pattern characteristics, laboratory experiments of laterally unconfined plu ...

American Geophysical Union2022

From Particles to Flocs: Revealing Where Flocculation Occurs in the Nearfield of a Negatively-Buoyant River Plume in a Large Lake (Lake Geneva)

David Andrew Barry, Ulrich Lemmin, Valentin Kindschi, Htet Kyi Wynn, Violaine Florette Piton

The dynamics of sediments entering lakes in river plumes is virtually unknown. This field study provides unprecedented evidence of the initiation and evolution of suspended sediment flocculation in the nearfield of the negatively-buoyant Rh & ocirc;ne Rive ...

Amer Geophysical Union2024

Improved Turbulence Profiling with Field-Adapted Acoustic Doppler Velocimeters Using a Bifrequency Doppler Noise Suppression Method

Ulrich Lemmin, David Hurther

A novel noise reduction method and corresponding technique are presented for improving turbulence measurements with acoustic Doppler velocimeters (ADVs) commonly used in field studies of coastal and nearshore regions, rivers, lakes, and estuaries. This bif ...

2008

Deployment of a dynamic penetrometer from manned submersibles for fine-scale geomorphology studies

David Andrew Barry, Ulrich Lemmin, Nicolas Le Dantec

Dynamic penetrometers reveal information about seafloor strength, stratification, stability, and sediment remobilization. However, positioning is often limited to a range of meters making it difficult to target small-scale geomorphologic features. Deployme ...

Association for the Sciences of Limnology and Oceanography (ASLO)2013

The role of submesoscale filaments in restratification of the surface mixed layer and dissolved oxygen variability in large Lake Geneva: field evidence complemented by Lagrangian particle-tracking

David Andrew Barry, Ulrich Lemmin, Rafael Sebastian Reiss, Seyed Mahmood Hamze Ziabari, Mehrshad Foroughan

Theoretical studies on oceans and large lakes have shown that submesoscale instabilities in frontal zones tend to reduce horizontal density gradients and enhance vertical density gradients, thereby re-stratifying the Surface Mixed Layer (SML). Submesoscale ...

2023

Inter-basin exchange and mixing in hypolimnion of a large lake: The role of long internal waves

Ulrich Lemmin

American Society of Limnology and Oceanography2005

A multi-frequency Acoustic Concentration and Velocity Profiler (ACVP) for boundary layer measurements of fine-scale flow and sediment transport processes

Ulrich Lemmin, David Hurther

The use of acoustics to measure sediment transport boundary layer processes has gained increasing acceptance over the past two decades. This has occurred through the development of increasingly sophisticated measuring systems and theoretical developments, ...

2011

Buoyancy-tilted Shear Layers and Coherent Structures in Hyperpycnal River Plume Plunging

David Andrew Barry, Ulrich Lemmin, Haoran Shi

Shear layers and corresponding Kelvin Helmholtz-type Coherent Structures (KHCS) can be generated by rivers discharging into laterally-unconfined quiescent open water bodies (e.g., lakes). When the river discharge has a greater density than the receiving wa ...

AMER GEOPHYSICAL UNION2025

What role does stratification play during winter in wind-induced exchange between the multi-depth basins of a large lake (Lake Geneva)?

David Andrew Barry, Ulrich Lemmin, Rafael Sebastian Reiss

Detailed studies of wind-driven interbasin exchange in lakes, focusing on the underlying driving forces and how they are affected by stratification, are presently lacking. We therefore investigated how strati-fication modifies wind-induced exchange between ...

2023

Inter-basin exchange and mixing in a large lake: the role of long internal waves

Ulrich Lemmin

2005

Dynamics of secoundary of secondary currents and surface boils in turbulent open-channel flow revealed by surface particle image velocity measurements

Ulrich Lemmin, Ismail Albayrak

IAHR2007

Cross-section periodicity of turbulent gravel-bed river flows

Mário Jorge Rodrigues Pereira Da Franca, Ulrich Lemmin

Taylor & Francis2005

Cold-water events in the mixed layer of Lake Geneva

Ulrich Lemmin, Baris Özen

2005

Detection and reconstruction of coherent structures based on wavelet multiresolution analysis

Mário Jorge Rodrigues Pereira Da Franca, Ulrich Lemmin

Taylor & Francis2006

Turbulence measurements in shallow flows in gravel-bed rivers

Mário Jorge Rodrigues Pereira Da Franca, Ulrich Lemmin

2006

Experimental study on fine sediment resuspension in accelerating rough-bed open-channel flow

Ulrich Lemmin, Fereshteh Bagherimiyab Hunkeler

CRC Press2009

Cold-water events and dissipation in the mixed layer of a lake

Ulrich Lemmin, Baris Özen

2006

Leman-Baikal: Remote sensing of lakes using an ultralight plane

Ulrich Lemmin, Bertrand Merminod, Damien Bouffard, Natacha Pasche, Martin Rehak, Dragos Constantin, Yosef Akhtman, Vincent Maurice Nouchi

The Leman-Baikal project constitutes an international Swiss-Russian collaborative research initiative in the field of physical limnology. The three-year framework involves the development and deployment of a novel multispectral and hyperspectral remote sen ...

2014

A Study of Bottom Boundary Layer Dynamics in Unsteady Sediment-Laden Open-Channel Flow Using Acoustic Profiling

Ulrich Lemmin, David Hurther, Fereshteh Bagherimiyab Hunkeler

2009

Means of noise reduction in acoustic turbulence measurement

Ulrich Lemmin, Koen Blanckaert

Taylor & Francis Ltd2006