WindMap UpdateWindMap Update · B. Sigrist -- WindMap Update, Aug. 2008, OSTIV Conference,WindMap...

WindMap UpdateWindMap UpdateIdentification of slope wind areasIdentification of slope wind areas

using topografic modelsusing topografic models

Update given at OSTIV Conference,Update given at OSTIV Conference,World Gliding Championship at LüsseWorld Gliding Championship at Lüsse

Berlin, August 2008Berlin, August 2008

Beda SigristBeda Sigrist

B. SigristB. Sigrist -- WindMap Update, Aug. 2008, OSTIV Conference,WindMap Update, Aug. 2008, OSTIV Conference,Lüsse/ BerlinLüsse/ Berlin 2

Conclusions of previousConclusions of previous OSTIVOSTIV--ConferenceConferenceStSt--Auban/FR,Auban/FR, 29.09.0729.09.07

TherMapTherMap considered reasonably matureconsidered reasonably mature(“Don’t spoil it!”)(“Don’t spoil it!”)

Increasing number ofIncreasing number of record flightsrecord flights using slopeusing slopewinds not foreseeable by convection modelswinds not foreseeable by convection models(Klaus Ohlmann etc.)(Klaus Ohlmann etc.)

Need for moreNeed for more precise slope wind modelsprecise slope wind models

Proposal of O. Liechti et H.Trimmel toProposal of O. Liechti et H.Trimmel to trytrygenerating slope wind mapsgenerating slope wind maps(“like TherMap”)(“like TherMap”)

Beginning of theWindMap developments

Beginning of theWindMap developments


ContentsContents

Topographic modelTopographic model

The basic WindMap approachThe basic WindMap approach Wind deviationWind deviation

Lee zonesLee zones

Channelling effectsChannelling effects

Some samplesSome samples

Options to go furtherOptions to go further


AA topographic modeltopographic model is a digitized land surfaceis a digitized land surface

TherMap/WindMap

SRTM ModelRaster ~90 m

TherMap/WindMap

SRTM ModelRaster ~90 m


For an independent surface field theFor an independent surface field the upwind componentupwind componentof the deviated wind can be computedof the deviated wind can be computed

Wind deviatingsurface flied

Guiding plane

Wind directionafter deviation

Normal vector ofsurface field

Original wind direction

Upwindcomponentafterdeviation


Lee wind areasLee wind areas

Wind direction

10


Sample map showing slope wind potentialSample map showing slope wind potentialSimple model (210 degrees)Simple model (210 degrees)


Acceleratedair flow

Wind channellingWind channelling

Without channelling

With channelling

WindMap considers local channelling ofwind (up to 400m)


Same sample map with channelling effectSame sample map with channelling effectThe map becomes more pronounced (Wind 210 Grad)The map becomes more pronounced (Wind 210 Grad)


ValidationsValidations using actual flight recordsusing actual flight recordsExample Stefan Leutenegger 13.5.07Example Stefan Leutenegger 13.5.07

EastEast--West flight north of Innsbruck InnsbruckWest flight north of Innsbruck Innsbruck

Innsbruck


Same Situation in 3DSame Situation in 3D(by overlaying WindMap to SeeYou)(by overlaying WindMap to SeeYou)

Innsbruck


Example of a flight of April 07Example of a flight of April 07Diablerets/CH, Wind from 180 degDiablerets/CH, Wind from 180 deg

Diablérèts


PublicationsPublications

The Basic WindMapThe Basic WindMap--Maps are available for downloadMaps are available for downloadon the Internet, or can be ordered on aon the Internet, or can be ordered on a CD.CD.

Areas covered:Areas covered: Alps of Austria, Switzerland and France,Alps of Austria, Switzerland and France,North and Center of Appennine/IT, PyreneesNorth and Center of Appennine/IT, Pyrenees

24 maps per region with wind directions incremented by 15 degrees


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Options to go furtherOptions to go further

TherMap/WindMap Actual weather situation

So far DELIBERATE separation from daily weather situation(too complex, variable, & difficult to select, represent and interpret)


One possibility: Daily (hourly) wind situationOne possibility: Daily (hourly) wind situation

Digitized wind data useable to generateactual WindMap maps ?

Digitized wind data useable to generateDigitized wind data useable to generateactual WindMap maps ?actual WindMap maps ?


Test made withTest made withtwo different wind data setstwo different wind data sets

1.1. FromFrom Austria ControlAustria Control::

raster 0.25 degrees (~20 km)raster 0.25 degrees (~20 km)

vertical 925, 850, 700 hPavertical 925, 850, 700 hPa

2.2. FromFrom MeteoblueMeteoblue (Uni Basle):(Uni Basle):

raster ~5 km, then smoothed to 1 kmraster ~5 km, then smoothed to 1 km

vertical 950, 900, 850,…, to 650 hPavertical 950, 900, 850,…, to 650 hPa


Example with data from AT Control:Example with data from AT Control:Flight H.Pirker, 23.07.07 at 15h UTCFlight H.Pirker, 23.07.07 at 15h UTC

Easy to identify the “hot areas” at a large map scale

Next slide


• This level of resolution hardly provides better local insights than thesame analysis using fixed average wind direction

• Raster too large for showing wind channelling in valleys

Example with data from AT Control:Example with data from AT Control:Extract of flight H.Pirker, 23.07.07 at 15h UTCExtract of flight H.Pirker, 23.07.07 at 15h UTC


Example with data from Meteoblue:Example with data from Meteoblue:20.07.08 at 12h UTC20.07.08 at 12h UTC

Original wind data at800 hPa with ~5kmraster

The same mapsmoothed downto 1 km raster


Example with data from Meteoblue:Example with data from Meteoblue:20.07.08 at 12h UTC20.07.08 at 12h UTC

Next slide


Example with data from Meteoblue:Example with data from Meteoblue:Extract of 20.07.08 at 12h UTCExtract of 20.07.08 at 12h UTC

• Maps reflectreal situationexperiencedduring flight

• Some valleychannellingeffectsare visible

• Some strongwaves foundduring flight(not includedin presentmodel)


ConclusionsConclusions

20km wind raster20km wind raster:: Allows already large scale identification ofAllows already large scale identification of

potential slope wind areaspotential slope wind areas

But for local interpretation the resultingBut for local interpretation the resultingWindMaps add little value againstWindMaps add little value againstpredetermined WindMapspredetermined WindMaps

Smoothed 5 kmSmoothed 5 km wind rasterwind raster Provides also better understanding of localProvides also better understanding of local

situationssituations

Has the potential to be further refined *):Has the potential to be further refined *): Local confluence effectsLocal confluence effects

More accurate identification of maskedMore accurate identification of masked(Ohlmann) areas(Ohlmann) areas

Should also show possible occurrence ofShould also show possible occurrence ofwaveswaves

*) 2 km raster being negotiated in CH*) 2 km raster being negotiated in CH


Key Questions ?Key Questions ?

How significant is theHow significant is thepotential user communitypotential user community forfordaily/hourly WindMap results ?daily/hourly WindMap results ?

Proposal e.g. one map/countryProposal e.g. one map/countryand day, for 12h UTCand day, for 12h UTC

If ok, is there anIf ok, is there an InternetInternethosthost providerprovider interested ininterested inupdating and publishingupdating and publishingdaily/hourly WindMap results ?daily/hourly WindMap results ?


Thank You !Thank You !

WindMap UpdateWindMap Update · B. Sigrist -- WindMap Update, Aug. 2008, OSTIV Conference,WindMap...

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