Publications de Nikki Vercauteren

The Effect of Scale on the Applicability of Taylor’s Frozen Turbulence Hypothesis in the Atmospheric Boundary Layer

Valentin Simeonov, Martin Froidevaux, Nikki Vercauteren, Marc Parlange, Chad Higgins, Caitlin Ellen Barry

Taylor’s frozen turbulence hypothesis is the central assumption invoked in most experiments designed to investigate turbulence physics with time resolving sensors. It is also frequently used in theoretical discussions when linking Lagrangian to Eulerian fl ...

2012

Water Vapor and Heat Exchanges over Lakes

Nikki Vercauteren

Quantifying the interaction of the atmosphere and water surfaces is of great importance for water resources management, climate studies of ocean-atmosphere exchange and regional climate in coastal areas. Atmospheric dynamics over water surfaces have genera ...

EPFL2011

Evolution of superficial lake water temperature profile under diurnal radiative forcing

Ulrich Lemmin, Nikki Vercauteren, Marc Parlange, Wolf Hendrik Huwald, Ivan Lunati

In lentic water bodies, such as lakes, the water temperature near the surface typically increases during the day, and decreases during the night as a consequence of the diurnal radiative forcing (solar and infrared radiation). These temperature variations ...

American Geophysical Union2011

Estimation of wet surface evaporation from sensible heat flux measurements

Nikki Vercauteren, Marc Parlange, Wolf Hendrik Huwald

A new method is proposed to estimate wet surface evaporation by means of measurements of sensible heat flux and of air temperature, relative humidity, and wind speed at one level only. This formulation is made possible by the linearization of the Bowen rat ...

American Geophysical Union2009

Scale dependence of subgrid-scale model coefficients: An a priori study

Nikki Vercauteren, Marc Parlange, Charles Vivant Ignacio Meneveau

Dynamic subgrid-scale models require an a priori assumption about the variation in the model coefficients with filter scale. The standard dynamic model assumes independence of scale while the scale dependent model assumes power-law dependence. In this pape ...

2008

Subgrid-Scale Dynamics of Water Vapour, Heat, and Momentum over a Lake

Ulrich Lemmin, Nikki Vercauteren, Marc Parlange, Wolf Hendrik Huwald, Charles Vivant Ignacio Meneveau

We examine the dynamics of turbulence subgrid (or sub-filter) scales over a lake surface and the implications for large-eddy simulations (LES) of the atmospheric boundary layer. The analysis is based on measurements obtained during the Lake-Atmosphere Turb ...

2008