Development and Application of a Multi-scale Flow Field Analysis System for Complex Terrain

Ulrich Uhrner, Renate Forkel, Johannes Werhahn, Raphael Jakob Reifeltshammer

Research output: Contribution to conferencePaper

Abstract

An accurate representation of flow in complex terrain is of major importance particularly for air quality related issues as well as wind energy. For air pollution modelling, an adequate representation of low wind speed conditions and inversions is a key aspect. Local scale models can resolve topographic effects at fine resolution of order 100 m, however their initialisation and specification of boundary conditions is challenging. Regional models may represent the synoptic and regional flow pattern by using nesting techniques but still have limited resolution. Several studies reported wind speed biases over basins and valleys with different models at katabatic conditions, particularly during winter.
This study presents a multi-scale modelling approach to represent these different scales utilizing high spatial resolution models at the local scale. To realize this, hourly regional model results based on multi-nesting techniques were used to simulate regional flow at 1 km horizontal resolution and finally to initialise a local flow model at 250 m resolution Optionally, in case of strong differences between simulated wind speed and temperature, measurements were used to adjust the initialisation of the local scale model. The focus of this study is laid on challenging winter conditions with low wind speeds and inversions.
Original languageEnglish
Number of pages5
Publication statusPublished - 19 Jun 2019
Event19th international conference on Harmonisation within Atmospheric Dispersion Modelling - Bruges, Belgium, Brügge, Belgium
Duration: 3 Jun 20196 Jun 2019
http://www.harmo.org/

Conference

Conference19th international conference on Harmonisation within Atmospheric Dispersion Modelling
Abbreviated titleHARMO 19
CountryBelgium
CityBrügge
Period3/06/196/06/19
Internet address

Fields of Expertise

  • Mobility & Production

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