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Citation:

Algorithm Derivation of Winter Facies Wind Protection of Shelterbelts Structural Parameters and Wind Permeability Coefficient

  • Received Date: 2011-04-26
  • To solve the problem in the absence of permeability algorithm in China's forestry industry standard "Technical Specification for Oasis Shelter Belt Construction (LY/T 1682—2006)", by defining and calculating the forest structural parameters-porosity β, stumpage surface porosity S', stumpage volume porosity V', aboveground surface area density C, aboveground bulk density W, the relations among these structural parameters and their relations with wind permeability coefficient α, shelterbelt width D and mean diameter of branch d were calculated, which is expressed as:W= V'/D = (1/4)dC= dS'/(4D) = (-πdlnβ)/(4D) =-(0.1πdlnα)/DIt is proofed that the main structural parameters have homogeneity and different structural parameters are of inheritance and consistency on the nature, there is no exclusivity in the strict sense, and is convertible under certain conditions, which is convenient for evaluating the wind-resistance effect of shelterbelt. A set of computational formulas for wind effect evaluation of farmland shelterbelt in dry and sandy area in northern China is derived.
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    Zhou X H, Brandle J R, Takle E S, et al. Relationship of three-dimensional structure to shelterbelt function: A theoretical hypothesis. [M]// Batish D R, Kohli R K, Jose S, et al. Ecological Basis of Agro Forestry[M]. New York: CRC Press, 2008:273-285
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Algorithm Derivation of Winter Facies Wind Protection of Shelterbelts Structural Parameters and Wind Permeability Coefficient

  • 1. The Experimental Center for Desert Forestry, Chinese Academy of Forestry, Dengkou 015200, Inner Mongolia, China

Abstract: To solve the problem in the absence of permeability algorithm in China's forestry industry standard "Technical Specification for Oasis Shelter Belt Construction (LY/T 1682—2006)", by defining and calculating the forest structural parameters-porosity β, stumpage surface porosity S', stumpage volume porosity V', aboveground surface area density C, aboveground bulk density W, the relations among these structural parameters and their relations with wind permeability coefficient α, shelterbelt width D and mean diameter of branch d were calculated, which is expressed as:W= V'/D = (1/4)dC= dS'/(4D) = (-πdlnβ)/(4D) =-(0.1πdlnα)/DIt is proofed that the main structural parameters have homogeneity and different structural parameters are of inheritance and consistency on the nature, there is no exclusivity in the strict sense, and is convertible under certain conditions, which is convenient for evaluating the wind-resistance effect of shelterbelt. A set of computational formulas for wind effect evaluation of farmland shelterbelt in dry and sandy area in northern China is derived.

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