High-Resolution Large-Eddy Simulations of Scalar Transport in Atmospheric Boundary Layer Flow over Complex Terrain

Michioka, Takenobu; Chow, Fotini Katopodes

doi:10.1175/2008jamc1941.1

Cited by 47 publications

(29 citation statements)

References 35 publications

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“…Until now, the coupled simulation of snow transport has been only implemented in regional climate models applied over large areas at horizontal resolution higher than 5 km (Gallée et al, 2001;Lenaerts et al, 2012). However, previous works have shown that atmospheric models can be run at high resolution in complex terrain to simulate in coupled mode meteorological situations such as wildland fire (Mandel et al, 2011, resolution of 100 m) or scalar dispersion (Michioka and Chow, 2008, resolution of 25 m). These studies were successful at capturing the flow structures in complex terrain.…”

Section: Vionnet Et Al: the Coupled Snowpack/atmosphere Model Mesmentioning

confidence: 99%

Simulation of wind-induced snow transport and sublimation in alpine terrain using a fully coupled snowpack/atmosphere model

et al. 2014

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Abstract. In alpine regions, wind-induced snow transport strongly influences the spatio-temporal evolution of the snow cover throughout the winter season. To gain understanding on the complex processes that drive the redistribution of snow, a new numerical model is developed. It directly couples the detailed snowpack model Crocus with the atmospheric model Meso-NH. Meso-NH/Crocus simulates snow transport in saltation and in turbulent suspension and includes the sublimation of suspended snow particles. The coupled model is evaluated against data collected around the experimental site of Col du Lac Blanc (2720 m a.s.l., French Alps). First, 1-D simulations show that a detailed representation of the first metres of the atmosphere is required to reproduce strong gradients of blowing snow concentration and compute mass exchange between the snowpack and the atmosphere. Secondly, 3-D simulations of a blowing snow event without concurrent snowfall have been carried out. Results show that the model captures the main structures of atmospheric flow in alpine terrain. However, at 50 m grid spacing, the model reproduces only the patterns of snow erosion and deposition at the ridge scale and misses smaller scale patterns observed by terrestrial laser scanning. When activated, the sublimation of suspended snow particles causes a reduction of deposited snow mass of 5.3 % over the calculation domain. Total sublimation (surface + blowing snow) is three times higher than surface sublimation in a simulation neglecting blowing snow sublimation.

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Section: Vionnet Et Al: the Coupled Snowpack/atmosphere Model Mesmentioning

confidence: 99%

Simulation of wind-induced snow transport and sublimation in alpine terrain using a fully coupled snowpack/atmosphere model

et al. 2014

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“…Chow et al (2006) and Weigel et al (2006Weigel et al ( , 2007 indicated that the complex thermal structure and dynamics of the atmospheric flow over the complex terrain present in the Swiss Alps may be reproduced in detail using ARPS with Moeng and Wyngaard's (1989) LES model turned on. Michioka and Chow (2008) also showed that ARPS performs well when configured to run in the LES mode. These authors coupled ARPS to a code that calculates the dispersion of passive pollutants and ran simulations in regions of highly complex terrain using one-way nested grids, where the highest resolution was 25 m in the horizontal directions.…”

Section: M S Paiva Et Al: Influence Of High-resolution Surface mentioning

confidence: 89%

“…ARPS was formulated to be run in either a RANS (ReynoldsAveraged Navier-Stokes) or a LES code that solves the threedimensional, compressible, nonhydrostatic, filtered NavierStokes equations. The relevant settings for our application requires the use of ARPS in the LES mode because the length scale is based on the grid spacing, as explained by , and the difference between RANS and LES in this case is in the definition of the length scale (Michioka and Chow, 2008). For the LES mode, the length scale employed in the eddy viscosity equation is based on the grid size, whereas the length scale for the RANS mode is based on a PBL (planetary boundary layer) depth or distance from the ground.…”

Section: M S Paiva Et Al: Influence Of High-resolution Surface mentioning

confidence: 99%

Influence of high-resolution surface databases on the modeling of local atmospheric circulation systems

2014

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Abstract. Large-eddy simulations are performed using the Advanced Regional Prediction System (ARPS) code at horizontal grid resolutions as fine as 300 m to assess the influence of detailed and updated surface databases on the modeling of local atmospheric circulation systems of urban areas with complex terrain. Applications to air pollution and wind energy are sought. These databases are comprised of 3 arc-sec topographic data from the Shuttle Radar Topography Mission, 10 arc-sec vegetation-type data from the European Space Agency (ESA) GlobCover project, and 30 arc-sec leaf area index and fraction of absorbed photosynthetically active radiation data from the ESA GlobCarbon project. Simulations are carried out for the metropolitan area of Rio de Janeiro using six one-way nested-grid domains that allow the choice of distinct parametric models and vertical resolutions associated to each grid. ARPS is initialized using the Global Forecasting System with 0.5 • -resolution data from the National Center of Environmental Prediction, which is also used every 3 h as lateral boundary condition. Topographic shading is turned on and two soil layers are used to compute the soil temperature and moisture budgets in all runs. Results for two simulated runs covering three periods of time are compared to surface and upper-air observational data to explore the dependence of the simulations on initial and boundary conditions, grid resolution, topographic and land-use databases. Our comparisons show overall good agreement between simulated and observational data, mainly for the potential temperature and the wind speed fields, and clearly indicate that the use of high-resolution databases improves significantly our ability to predict the local atmospheric circulation.

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“…Vertical grid spacing of 2 m is utilized in both domains, up to a height of 84 m, above which vertical stretching is applied. Note that ARPS and ARPS-CANOPY have been applied in previous studies with horizontal and vertical grid spacing O (10 m) or smaller (e.g., Michioka and Chow, 2008;Dupont and Brunet, 2008). With this vertical grid structure, there are nine grid points at or below the canopy crown (canopy height is 18 m).…”

Section: Model Configuration and Parameterizationmentioning

confidence: 99%

A study of the influence of forest gaps on fire–atmosphere interactions

et al. 2016

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Abstract. Much uncertainty exists regarding the possible role that gaps in forest canopies play in modulating fireatmosphere interactions in otherwise horizontally homogeneous forests. This study examines the influence of gaps in forest canopies on atmospheric perturbations induced by a low-intensity fire using the ARPS-CANOPY model, a version of the Advanced Regional Prediction System (ARPS) model with a canopy parameterization. A series of numerical experiments are conducted with a stationary low-intensity fire, represented in the model as a line of enhanced surface sensible heat flux. Experiments are conducted with and without forest gaps, and with gaps in different positions relative to the fire line. For each of the four cases considered, an additional simulation is performed without the fire to facilitate comparison of the fire-perturbed atmosphere and the background state. Analyses of both mean and instantaneous wind velocity, turbulent kinetic energy, air temperature, and turbulent mixing of heat are presented in order to examine the fire-perturbed atmosphere on multiple timescales. Results of the analyses indicate that the impact of the fire on the atmosphere is greatest in the case with the gap centered on the fire and weakest in the case with the gap upstream of the fire. It is shown that gaps in forest canopies have the potential to play a role in the vertical as well as horizontal transport of heat away from the fire. Results also suggest that, in order to understand how the fire will alter wind and turbulence in a heterogeneous forest, one needs to first understand how the forest heterogeneity itself influences the wind and turbulence fields without the fire.

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High-Resolution Large-Eddy Simulations of Scalar Transport in Atmospheric Boundary Layer Flow over Complex Terrain

Cited by 47 publications

References 35 publications

Simulation of wind-induced snow transport and sublimation in alpine terrain using a fully coupled snowpack/atmosphere model

Simulation of wind-induced snow transport and sublimation in alpine terrain using a fully coupled snowpack/atmosphere model

Influence of high-resolution surface databases on the modeling of local atmospheric circulation systems

A study of the influence of forest gaps on fire–atmosphere interactions

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