Models of behavior of forests under influence of wind loads

Authors

  • Dmitriy V. Rebko State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; ul. Mashinostroiteley, 25, Minsk, 220118, Belarus
  • Andrey N. Kamlyuk State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; ul. Mashinostroiteley, 25, Minsk, 220118, Belarus https://orcid.org/0000-0002-9347-0778
  • Sergey A. Borisevich Belarusian State Technological University; ul. Sverdlova, 13A, Minsk, 220006, Belarus

DOI:

https://doi.org/10.33408/2519-237X.2017.1-3.323

Keywords:

wind load, uprooting, stem breakage, critical wind speed, breaking stress, turning moment

Abstract

Purpose. To analyse two independently mathematical models (GALES and HWIND) for predicting the critical wind speed and turning moment needed to uproot and break the tree stems.

Methods. The GALES model calculates the aerodynamic roughness and zero-plane displacement of a forest stand. The aerodynamic roughness provides a measure of the stress (force: unit area) imposed on the canopy as a function of wind speed and the zero-plane displacement provides a measure of the average height on the tree at which the wind acts. This allows calculation of the bending moment imposed on the tree for any wind speed, as a result is the model to make predictions of the wind speed at which the tree will be overturned and broken. In the HWIND model the turning moment arising from the wind drag on the crown is calculated assuming a logarithmic upwind profile. Based on the sum of wind load and the contribution from the overhanging weight of the stem and branches the total bending moment is calculated. The breaking strength of the stem and the support given by the root-soil plate are calculated from previous experiments.

Findings. This allows calculating the wind speed required to break and overturn the tree.

Application field of research. Forecasting the consequences of emergency situations connected with strong winds. Conclusion. Models comparisons showed that it is necessary to improve existing models and to develop new ones which will be more accurate.

Author Biographies

Dmitriy V. Rebko, State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; ul. Mashinostroiteley, 25, Minsk, 220118, Belarus

Chair of Fire Rescue Equipment, Lecturer

Andrey N. Kamlyuk, State Educational Establishment «University of Сivil Protection of the Ministry for Emergency Situations of the Republic of Belarus»; ul. Mashinostroiteley, 25, Minsk, 220118, Belarus

Deputy Head of the University for Scientific and Innovation Activity; PhD in Physical and Mathematical Sciences, Associate Professor

Sergey A. Borisevich, Belarusian State Technological University; ul. Sverdlova, 13A, Minsk, 220006, Belarus

Assistant; PhD in Technical Sciences

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Published

2017-08-14

How to Cite

Rebko Д., Kamlyuk А. and Borisevich С. (2017) “Models of behavior of forests under influence of wind loads”, Journal of Civil Protection, 1(3), pp. 323–331. doi: 10.33408/2519-237X.2017.1-3.323.

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