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Statistical features of aerodynamic effective roughness length over heterogeneous terrain

Huang Jin Zhong Zhong Guo Wei-Dong Lu Wei

Statistical features of aerodynamic effective roughness length over heterogeneous terrain

Huang Jin, Zhong Zhong, Guo Wei-Dong, Lu Wei
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  • Received Date:  25 August 2012
  • Accepted Date:  03 October 2012
  • Published Online:  05 March 2013

Statistical features of aerodynamic effective roughness length over heterogeneous terrain

  • 1. Department of Basic Course, Nanjing Institute of Technology, Nanjing 211167, China;
  • 2. College of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China;
  • 3. ICGCR, Nanjing University, Nanjing 210093, China
Fund Project:  Project supported by the National Basic Research Program of China (Grant Nos. 2011CB952002, 2010CB428505).

Abstract: With a new scheme of effective roughness length for heterogeneous terrain, based on the atmospheric boundary layer Monin-Obukhov similarity theory as well as flux and mass conservation principles, the statistical features of effective roughness length and its sensitivity to atmospheric stratification stability and roughness step for three surface category case are investigated. The results show that the effective roughness length is greater than the area-weighted logarithmic average one and the effective drag coefficient is more than 10% greater than the average one in most cases. The effective roughness length is much more sensitive to the roughness step, though it is dependent on the atmospheric stratification stability, and the relative percentage of effective roughness length and the effective drag coefficient will be 4 times and 3 times, respectively, for the double roughness step case. Therefore, the area-weighted average roughness length should be replaced by the effective one when the surface heterogeneity is considered in numerical models, which can represent the integrated effect of heterogeneous terrain.

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