Icing Micro-terrain Identification and Verification Method of Transmission Line Based on DEM Analysis
Widespread micro-terrain microclimates pose a serious risk of icing for transmission lines.However,the cur-rent definition of micro-terrain remains a vague descriptive definition,and existing quantification methods mainly rely on a large number of observational samples and empirical knowledge.This paper proposes a method for extracting indicators and identification criteria for micro-terrain based on digital elevation models(DEMs)and statistical data on icing disasters.Simplified geographical models are constructed based on geographical feature boundaries for various micro-terrain types.Validation of the classification and identification conditions is performed through numerical simulation calculations and wind tunnel experiments.Moreover,the meteorological characteristics are simulated under different micro-terrain condi-tions,and the reliability of the identification conditions for ice-covered micro-terrain is verified.The results indicate that icing micro-terrain is typically distributed continuously and is less likely to exist in isolation,often exhibiting complex combinations of multiple micro-terrain types.Typical icing micro-terrain that meets the identification criteria displays dis-tinct micro-meteorological characteristics,with the most pronounced effects at windward entrances and maximum wind acceleration occurring at mountain summits except for saddle types.This method overcomes the shortcomings of cluster-ing methods that lack geographical interpretability and reduces sample dependence,providing design standards for transmission lines in the absence of icing observations.
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