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(abstract) Measurement of Aerodynamic Roughness Using Radar Backscatter over Vegetated Surfaces

Show simple item record Wall, S.D. en_US Rasmussen, K.R. en_US Greeley, R. en_US 2004-10-06T03:53:03Z 2004-10-06T03:53:03Z 1994-01-17 en_US
dc.identifier.citation France en_US
dc.identifier.clearanceno 93-1199 en_US
dc.description.abstract Gathering of local information from remote platforms is often a more cost-effective way of obtaining the required data type than are local measurements. A good example is the collection of wind regime data in order to infer the amount and type of aeolian transport at a given site. This paper describes a potential mechanism for remotely inferring the wind regime from synthetic aperture radar data and describes a project to estimate the practicality of using such a mechanism. Both radar backscatter and wind flow are functions of the roughness of the site under study. It is therefore reasonable to suspect that a fairly well-behaved relationship might exist between normalized radar backscatter coefficient and aerodynamic roughness length. Aeolian transport of small particles depends in turn on wind flow and is an important quantity to measure for several economic-related reasons, but the direct measurement of wind flow regime generally involves construction of wind towers and many days of data collection, making such data extremely expensive and prohibitive in areas that cannot be easily accessed. For both desert and vegetated sites where extensive wind profile data already exist, a NASA airborne multifrequency, multipolarization radar was used to acquire radar data at several incidence angles. At the vegetated sites, vegetation height varied from tens of centimeters to several meters, and surface roughness was a few centimeters. en_US
dc.format.extent 63300 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject.other radar backscatter vegetated surfaces surface roughness wind flow aeolian transport en_US
dc.title (abstract) Measurement of Aerodynamic Roughness Using Radar Backscatter over Vegetated Surfaces en_US

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