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1962 to present

Once a month. Approximately 100,000-125,000 new records are added per year.

Over 8,179,158 records as of November 2008

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TI:	Title Drag Partition for Regularly-Arrayed Rough Surfaces
AU:	Author Crawley, D M; Nickling, W G
AF:	Affiliation Guelph, Univ., Canada [Crawley]
SO:	Source Boundary-Layer Meteorology. Vol. 107, no. 2, pp. 445-468. May 2003
IS:	ISSN 0006-8314
PY:	Publication Year 2003
PB:	Publisher Dordrecht, Netherlands: Kluwer Academic Publishers, Dordrecht
AB:	Abstract Vegetation and other roughness elements distributed across a surface can provide significant protection against wind erosion by extracting momentum from the flow and thereby reducing the shear stress acting at the surface. A theoretical model has previously been presented to specify the partition of drag forces for rough surfaces and to predict required vegetation density to suppress wind erosion. However, the model parameters have not yet been constrained and the predictive capacity of the model has remained uncertain. A wind-tunnel study was conducted to measure the drag partition for a range of roughness densities and to parameterise the model in order to improve its range of potential applicability. The drag forces acting on both an array of roughness elements and the intervening surface were measured independently and simultaneously using new drag balance instrumentation. A detailed measure of the spatial heterogeneity of surface shear stresses was also made using Irwin sensors. The data agreed well with previous results and confirmed the general form of the model. Analysis of the drag partition confirmed the parameter definition beta = C(R)/C(S) (where C(R) and C(S) are roughness element and surface drag coefficients, respectively) and a constant proportional difference between the mean and maximum surface shear stress was found. The results of this experiment suggest that the definition for m, the surface shear stress inhomogeneity parameter, should be revised, although the theoretical and physical reasons for including this parameter in the model appear to be valid. Best-fit values for m ranged from 0.53 to 0.58. (Author)
LA:	Language ENGLISH
PT:	Publication Type Journal Article
DE:	Descriptors *wind Erosion; *surface Roughness Effects; *boundary Layer Flow; *atmospheric Boundary Layer; Curve Fitting; Drag Coefficients; Momentum Transfer
CL:	Classification 47 METEOROLOGY AND CLIMATOLOGY (AH)
UD:	Update 200313
AN:	Accession Number A03-20991 (AH)

The following field codes are found in the records of this database. Here they are listed in alphabetical order by two-letter code. See Field Codes and Search Examples for detailed descriptions and search examples.

AB = Abstract	LA = Language
AF = Affiliation	MC = Material Classification
AN = Accession Number	ML = Material
AU = Author	NR = Number of References
CA = Corporate Author	NT = Notes
CF = Conference	NU = Other Numbers
CL = Classification	PA = Patent Application Data
DE = Descriptors	PB = Publisher
DO = DOI	PC = Patent Country
EA = Email Address	PN = Patent Number
ED = Editor	PR = Patent Priority Data
EI = Electronic ISSN	PT = Publication Type
IB = ISBN	PY = Publication Year
IL = Illustrations	RE = References
IS = ISSN	RL = Resource Location
JC = Journal Coverage	RP = Report Number
JC = Journal Issue	SF = Subfile
JN = Journal Name	SO = Source
JV = Journal Volume	TI = Title
KW = Keywords	UD = Update