Abstract
A damage pattern that is occasionally found after a period of strong winds shows an area of damaged trees inside a forest stand behind an intact stripe of trees directly at the windward edge. In an effort to understand the mechanism leading to this damage pattern, wind loading in the forest-edge region during passages of extreme gusts with different characteristics are investigated using a scaled forest model in the wind tunnel. The interaction of a transient extreme gust with the stationary atmospheric boundary layer (ABL) as a background flow at the forest edge leads to the formation of a vortex at the top of the canopy. This vortex intensifies when travelling downstream and subsequently deflects high-momentum air from above the canopy downwards resulting in increased wind loading on the tree crowns. Under such conditions, the decrease in wind loading in the streamwise direction can be relatively weak compared to stationary ABL approach flows. The resistance of trees with streamwise distance from the forest edge, however, is the result of adaptive growth to wind loading under stationary flow conditions and shows a rapid decline within two to three tree heights behind the windward edge. For some of the extreme gusts realized, an exceedance of the wind loading over the resistance of the trees is found at approximately three tree heights behind the forest edge, suggesting that the damage pattern described above can be caused by the interaction of a transient extreme gust with the stationary ABL flow.
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References
Adrian RJ (1991) Particle-imaging techniques for experimental fluid mechanics. Annu Rev Fluid Mech 23:261–304
Adrian RJ, Westerweel J (2011) Particle image velocimetry. Cambridge University Press, Cambridge
Bonnesoeur V, Constant T, Moulia B, Fournier M (2016) Forest trees filter chronic wind-signals to acclimate to high winds. New Phytol 210:850–860
Brasseur O (2001) Development and application of a physical approach to estimating wind gusts. Mon Weather Rev 129:5–25
Choi EC, Hidayat FA (2002) Gust factors for thunderstorm and non-thunderstorm winds. J Wind Eng Ind Aerodyn 90:1683–1696
Dantec Dynamics (2013) DynamicStudio user’s guide. Dantec, Skovlunde
Dupont S, Brunet Y (2008a) Impact of forest edge shape on tree stability: a large-eddy simulation study. Forestry 81:299–315
Dupont S, Brunet Y (2008b) Edge flow and canopy structure: a large-eddy simulation study. Boundary-Layer Meteorol 126:51–71
Dupont S, Brunet Y (2009) Coherent structures in canopy edge flow: a large-eddy simulation study. J Fluid Mech 630:93–128
Dupont S, Pivato D, Brunet Y (2015) Wind damage propagation in forests. Agric For Meteorol 214:243–251
ESDU (2001) Characteristics of atmospheric turbulence near the ground, Part II: single point data for strong winds (neutral atmosphere). Eng Sci Data Unit 85020:42
Finnigan JJ (2000) Turbulence in plant canopies. Annu Rev Fluid Mech 32:519–571
Finnigan JJ, Brunet Y (1995) Turbulent airflow in forests on flat and hilly terrain. In: Coutts MP, Grace J (eds) Wind and Trees. Cambridge University Press, Cambridge, pp 3–40
Gardiner BA, Stacey GR, Belcher RE, Wood CJ (1997) Field and wind tunnel assessments of the implications of respacing and thinning for tree stability. Forestry 70:233–252
Gardiner B, Peltola H, Kellomäki S (2000) Comparison of two models for predicting the critical wind speeds required to damage coniferous trees. Ecol Model 129:1–23
Gardiner B, Marshall B, Achim A, Belcher R, Wood C (2005) The stability of different silvicultural systems: a wind-tunnel investigation. Forestry 78:471–484
Gardiner B, Byrne K, Hale S, Kamimura K, Mitchell SJ, Peltola H, Ruel JC (2008) A review of mechanistic modelling of wind damage risk to forests. Forestry 81:447–463
Gardiner B, Schuck ART, Schelhaas M-J, Orazio C, Blennow K, Nicoll B (2013) Living with storm damage to forests. European Forest Institute, Joensuu
Grant RH (1983) The scaling of flow in vegetative structures. Boundary-Layer Meteorol 27:171–184
Gromke C (2011) A vegetation modeling concept for building and environmental aerodynamics wind tunnel tests and its application in pollutant dispersion studies. Environ Pollut 159:2094–2099
Gromke C, Ruck B (2012) Pollutant concentrations in street canyons of different aspect ratio with avenues of trees for various wind directions. Boundary-Layer Meteorol 144:41–64
Gromke C, Ruck B (2015) Introduction of a new forest model for wind-tunnel studies and PIV-measurements of flow phenomena at the windward forest edge. In: Proceedings 23. GALA Fachtagung “Lasermethoden in der Strömungsmesstechnik”, Dresden, pp 43.1–8
Gromke C, Ruck B (2016) PIV-measurements on the momentum transfer in the forest edge region during extreme gusts. In: Proceedings 24. GALA Fachtagung “Experimentelle Strömungsmechanik”, Cottbus, pp 37.1–10
Gromke C, Jamarkattel N, Ruck B (2016) Influence of roadside hedgerows on air quality in urban street canyons. Atmos Environ 139:75–86
Grunert F, Benndorf D, Klingbeil K (1984) Neuere Egebnisse zum Aufbau von Schutzpflanzungen. Beitr Forstwirtsch 18:108–115 (in German)
Holmes JD (2007) Wind loading of structures, 2nd edn. Taylor and Francis, New York
Klausmann K, Ruck B (2017) Drag reduction of circular cylinders by porous coating on the leeward side. J Fluid Mech 813:382–411
Koizumi A, Motoyama J, Sawata K, Sasaki Y, Hirai T (2010) Evaluation of drag coefficients of poplar-tree crowns by a field test method. J Wood Sci 56:189–193
Krayer WR, Marshall RD (1992) Gust factors applied to hurricane winds. Bull Am Meteorol Soc 73:613–618
Mayhead GJ (1973) Some drag coefficients for British forest trees derived from wind tunnel studies. Agric Meteorol 12:123–130
Morgan J, Cannell MG (1994) Shape of tree stems—a re-examination of the uniform stress hypothesis. Tree Physiol 14:49–62
Morse AP, Gardiner BA, Marshall BJ (2002) Mechanisms controlling turbulence development across a forest edge. Boundary-Layer Meteorol 103:227–251
Paulsen BM, Schroeder JL (2005) An examination of tropical and extratropical gust factors and the associated wind speed histograms. J Appl Meteorol 44:270–280
Peltola H, Gardiner B, Nicoll B (2013) Mechanics of wind damage. In: Gardiner B, Schuck ART, Schelhaas M-J, Orazio C, Blennow K, Nicoll B (eds) Living with storm—damage to forests. European Forest Institute, Joensuu, pp 31–38
Quine CP, Gardiner BA (2007) Understanding how the interaction of wind and trees results in windthrow, stem breakage, and canopy gap formation. In: Johnson EA, Miyanishi K (eds) Plant disturbance ecology—the process and the response. Elsevier, Oxford, pp 103–155
Raffel M, Willert CE, Kompenhans J (2007) Particle image velocimetry: a practical guide. Springer Science & Business Media, Berlin
Raupach MR, Bradley EF, Ghadiri H (1987) A wind tunnel investigation into aerodynamic effect of forest clearings on the nesting of abbott’s Boody on Christmas Island. Tech. rep., CSIRO Centre for Environmental Mechanics, Canberra, 21 pp
Raupach M, Finnigan JJ, Brunet Y (1996) Coherent eddies and turbulence in vegetation canopies: the mixing-layer analogy. Boundary-Layer Meteorol 78:351–382
Ruck B (2017) Lecture on environmental aerodynamics. http://www.windforschung.de/bilder_orginale/pub/U-pup/Thumbnails.html
Rudnicki M, Mitchell SJ, Novak MD (2004) Wind tunnel measurements of crown streamlining and drag relationships for three conifer species. Can J For Res 34:666–676
Schelhaas M-J, Nabuurs G-J, Schuck A (2003) Natural disturbances in the European forests in the 19th and 20th centuries. Glob Change Biol 9:1620–1633
Stacey GR, Belcher RE, Wood CJ, Gardiner BA (1994) Wind flows and forces in a model spruce forest. Boundary-Layer Meteorol 69:311–334
Tischmacher M, Ruck B (2013) Interaction of gusts and forest edges—an experimental wind-tunnel study. Forestry 86:523–532
Traeumner K, Wieser A, Ruck B, Frank C, Röhner L, Kottmeier C (2012) The suitability of Doppler lidar for characterizing the wind field above forest edges. Forestry 85:399–412
Vickery PJ, Skerlj PF (2005) Hurricane gust factors revisited. J Struct Eng 131:825–832
Vogel S (1989) Drag and reconfiguration of broad leaves in high winds. J Exp Bot 40:941–948
Vogel S (2009) Leaves in the lowest and highest winds: temperature, force and shape. New Phytol 183:13–26
Vollsinger S, Mitchell SJ, Byrne KE, Novak MD, Rudnicki M (2005) Wind tunnel measurements of crown streamlining and drag relationships for several hardwood species. Can J For Res 35:1238–1249
Westerweel J (1997) Fundamentals of digital particle image velocimetry. Meas Sci Technol 8:1379
Westerweel J, Elsinga GE, Adrian RJ (2013) Particle image velocimetry for complex and turbulent flows. Annu Rev Fluid Mech 45:409–436
Wiernga J (1993) Representative roughness parameters for homogeneous terrain. Boundary-Layer Meteorol 63:323–363
WTG (1994) WTG-Merkblatt über Windkanalversuche in der Gebäudeaerodynamik. Windtechnologische Gesellschaft, Aachen, Germany, 42 pp (in German)
Yang B, Shaw RH, Paw UKT (2006) Wind loading on trees across a forest edge: a large eddy simulation. Agric For Meteorol 141:133–146
Acknowledgements
The financial support of the Deutsche Forschungsgemeinschaft DFG (German Research Foundation) under Grant Ru 345/30-2 is gratefully acknowledged by the authors. The authors are indebted to Graeme Prest (Forestry Commission, UK) for providing the photograph shown in Fig. 1 and to Barry Gardiner (Forestry Commission, UK/INRA, France) for providing information. Finally, the authors thank the anonymous reviewers for helpful comments.
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Gromke, C., Ruck, B. On Wind Forces in the Forest-Edge Region During Extreme-Gust Passages and Their Implications for Damage Patterns. Boundary-Layer Meteorol 168, 269–288 (2018). https://doi.org/10.1007/s10546-018-0348-4
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DOI: https://doi.org/10.1007/s10546-018-0348-4