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Influence of Along-valley Terrain Heterogeneity on Exchange Processes Over Idealized Valleys : Volume 15, Issue 12 (16/06/2015)

By Wagner, J. S.

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Book Id: WPLBN0003988264
Format Type: PDF Article :
File Size: Pages 15
Reproduction Date: 2015

Title: Influence of Along-valley Terrain Heterogeneity on Exchange Processes Over Idealized Valleys : Volume 15, Issue 12 (16/06/2015)  
Author: Wagner, J. S.
Volume: Vol. 15, Issue 12
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Rotach, M. W., Gohm, A., & Wagner, J. S. (2015). Influence of Along-valley Terrain Heterogeneity on Exchange Processes Over Idealized Valleys : Volume 15, Issue 12 (16/06/2015). Retrieved from http://ebooklibrary.org/


Description
Description: Institute of Meteorology and Geophysics, University of Innsbruck, Austria. Idealized numerical simulations of thermally driven flows over various valley–plain topographies are performed under daytime conditions. Valley floor inclination and narrowing valley cross sections are systematically varied to study the influence of along-valley terrain heterogeneity on the developing boundary layer structure, as well as horizontal and vertical transport processes. Valley topographies with inclined valley floors of 0.86° increase upvalley winds by a factor of about 1.9 due to smaller valley volumes (volume effect) and by a factor of about 1.6 due to additional upslope buoyancy forces. Narrowing the valley cross section by 20 km per 100 km along-valley distance increases upvalley winds by a factor of about 2.6. Vertical mass fluxes out of the valley are strongly increased by a factor between 1.8 and 2.8 by narrowing the valley cross sections and by a factor of 1.2 by inclining the valley floor. Trajectory analysis shows intensified horizontal transport of parcels from the foreland into the valley within the boundary layer in cases with inclined floors and narrowing cross sections due to increased upvalley winds.

Summary
Influence of along-valley terrain heterogeneity on exchange processes over idealized valleys

Excerpt
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