Analysis of Aerodynamic Roughness of the Debris-Covered Keqicar Glacier

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Aerodynamic roughness length z0 is an important aerodynamic parameter in representing the aerodynamic properties and estimating on the energy balance of the surface moraine. The aerodynamic roughness length in the pre-ablation and ablation period at No. 3 site of the Koxkar Baxi Glacier were calculated using the single dimensional wind speed method and the data from the eddy covariance system in 2009. The results show that z0was 0. 101 m in the pre-ablation period and was ranged from 0. 093 m to 0. 098 m in the ablation period. The influenced of snow covering on the surface on z0 was greatly. On the snow-covered surface,z0 was bigger. The z0 in unstable air condition was big but in stable air condition was small. When the wind speed was constant,z0 increased with the friction velocity increasing; when the friction velocity was constant,z0 decreased with the wind speed increasing.