ESTIMATION OF SURFACE ROUGHNESS LENGTH FOR URBAN LAND: A REVIEW
INTERNATIONAL JOURNAL OF INNOVATIVE RESEARCH IN TECHNOLOGY
Urbanization and development in developing countries have led to growth of urban area in all the directions. To accommodate this huge population urban areas have seen abrupt increase in the number of high rise structures which are affect the flow of wind inside the urban area. Wind flow inside an urban area is a key microclimatic phenomenon as it counters the effect of Urban Heat Island affect and also disperses the accumulated pollution. To model and simulate the behaviour of urban winds
... the urban area knowledge of urban roughness plays a significant role. Urban roughness constitutes of land use and land cover elements that introduce turbulence in the flow of wind. Roughness Length (z 0) and Zero Plane Displacement Height (z d) are two key parameters that are used to designate urban roughness. Many Air Pollution dispersion models are depend upon surface roughness values. To Accurate predictions of air quality and atmospheric dispersion at high spatial resolution rely on surface roughness parameters. Thus, Computation of these parameters is complex and is usually done using Micrometeorological methods and Morphometric methods. Micrometeorological methods are expensive and require complex set up to be installed and hence are not feasible to be used in urban areas. This paper gives a detail description about surface roughness and different type of estimation of surface roughness.