Estimating mean windflow in hilly terrain from tamarack (Larix lancina (Du Roi) K. Koch) deformation

Robertson, Alexander

doi:10.1007/bf02189371

Cited by 16 publications

(10 citation statements)

References 14 publications

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“…If wind direction is parallel to the ridge, wind can then pass around the obstacle so that wind speed and turbulence are greater at the bottom of the slope where the obstacle is larger (Hutte 1968). When wind blows perpendicular to the crest, wind speed will increase uphill, being maximum at the summit, whereas if wind direction is oblique, wind will be blowing around and over the upwind shoulder so that wind often becomes turbulent and changes direction at mid-slope (Robertson 1986). Just behind a hill top, windthrow hazard can be quite high since, even though wind speed abates, turbulence continues to increase (Hutte 1968;Moore 1977).…”

Section: Topographymentioning

confidence: 99%

“…Robertson (1991), working with larch in Newfoundland, was able to relate the presence of compression wood and wind direction. Stem characteristics could then be used on level ground but the formation of compression wood induced by slope would prevent their use on dissected topography (Robertson 1986). Robertson (1986Robertson ( ,1987 has also demonstrated a relationship between crown deformations and average wind speed and direction.…”

Section: Local Observationsmentioning

confidence: 99%

“…Stem characteristics could then be used on level ground but the formation of compression wood induced by slope would prevent their use on dissected topography (Robertson 1986). Robertson (1986Robertson ( ,1987 has also demonstrated a relationship between crown deformations and average wind speed and direction. An index of deformation, built from field photographs, was used to estimate average wind speed (Robertson 1987).…”

Section: Local Observationsmentioning

confidence: 99%

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Understanding windthrow: Silvicultural implications

Ruel¹

1995

The Forestry Chronicle

156

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Windthrow is a damaging agent that can be of paramount Le renversement des arbres sous l'action du vent peut revetir une importance in silviculture. Windthrow depends on a number of importance considkrable en sylviculture. Le chablis dkpend de nomfactors interacting with each other. This paper tries to incorporate breux facteurs en interaction. Cet article tente d'intkgrer la notion windthrow concerns into the silvicultural decision making process de risque de chablis dans la prise de dkcisions sylvicoles en by understanding the windthrow process and its interaction with amkliorant la comprkhension du phknomkne et de son interaction silviculture. The forces involved in the windthrow process are avec la sylviculture. Dans un premier temps, les forces impliqukes reviewed. The effects of natural factors on these forces are dans le processus du renversement sont passkes en revue. Par la examined and the potentid impact of silviculture on these factors suite, l'effet des variables naturelles sur ces forces est examink pour is discussed. Some available hazard rating systems are reviewed, ensuite de reffet &s prafiques sylvicoles sur celles-ci. Enfin, wing to underline their applicability in the Eastern Canadian conquelques systkmes d'kvaluation du risque de chablis sont prksentext. Climate affects the severity and frequency of storms.tks en faisant ressortir leur applicabilitk dans le contexte de 1'Est However, wind speed in a particular stand is influenced strongly Canadien. ~e a une grande influence sur l'ampleur et la by local topography. Soil and root characteristics determine the frkquence des tempetes. Par contre, la force du vent agissant sur sturdiness of the anchoring system. Many stand-related factors, , peuplement donne est grandement influenck par la toPogaphie such as stand height, age, density and stem form, can also exert locale. Les caractkristiques du sol et du systkme racinaire, quant an influence on the resistance to uprooting. Silviculture can moda elles, dkterminent la sobdig de llancrage de la tige. plusieurs fatify the vulnerability to windthrow by acting on these factors. In de peuplement peuvent aussi jouer un file quant 2 la d h b i l i g stands at risk, stripcutting, thinning Or the of new margins au hauteur, gge et densit6 du peuplement, forme des can cause important losses. The impact of stem form also inditiges... L,action du sylviculteur sur un de ces facteurs peut influthe need for an of stand density. Among the enter le risque de chablis. Dans les peuplements susceptibles, la hazard rating systems available, the British system seems the most coupe par bandes, rklclaircie ou la &ation de nouvelles lis2res complete but would require some adjustments for use in the vent occasionner des considkrables, L,importance de Eastern Canadian context. la forme des tiges dkmontre l'intkret d'un contr6le prkcoce de la densit6 du peuplement. Parmi les systkmes d'kvduation du risque Key words: windthrow, uprooting, blowdown, wind de chablis, le systkme Britannique semble le plus complet mais des ajuste...

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Section: Topographymentioning

confidence: 99%

Section: Local Observationsmentioning

confidence: 99%

Section: Local Observationsmentioning

confidence: 99%

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Understanding windthrow: Silvicultural implications

Ruel¹

1995

The Forestry Chronicle

156

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show abstract

“…Our data suggest patterns of distortion in alpine and subantarctic plants, regardless of growth form, do not simply relate to the most frequent strong winds, as is generally the case in other environments (Noguchi, 1979;Hadley and Smith, 1983;Robertson, 1986;Wooldridge et al, 1996), with some exceptions, such as seasonality of winds (Holtmeier, 2009).…”

Section: Correspondence Of Distortion To Wind Regimesmentioning

confidence: 54%

Wind Distortion in Alpine and Subantarctic Plants is Constant among Life Forms but does not Necessarily Reflect Prevailing Wind Direction

Fitzgerald

Kirkpatrick

2017

Arctic, Antarctic, and Alpine Research

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“…The tree is photographed perpendicular to the maximum deformation, and analyzed using a grid overlay on the photo to measure deformation angles. Tree ring analysis can also be used to estimate windspeed (Robertson 1986). Tree sections are measured for ring width on the lee and windward side of the trunk, with ring width wider on the lee or branched side.…”

Section: Experimental Methodsmentioning

confidence: 99%

Proceedings-symposium on whitebark pine ecosystems: Ecology and management of a high-mountain resource; 1989 March 29-31; Bozeman, MT

Schmidt¹,

McDonald²

1990

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Estimating mean windflow in hilly terrain from tamarack (Larix lancina (Du Roi) K. Koch) deformation

Cited by 16 publications

References 14 publications

Understanding windthrow: Silvicultural implications

Understanding windthrow: Silvicultural implications

Wind Distortion in Alpine and Subantarctic Plants is Constant among Life Forms but does not Necessarily Reflect Prevailing Wind Direction

Proceedings-symposium on whitebark pine ecosystems: Ecology and management of a high-mountain resource; 1989 March 29-31; Bozeman, MT

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