Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 431470
Title Crosswind from a Single Aperture Scintillometer Using Spectral Techniques
Author(s) Dinther, D. van; Hartogensis, O.K.; Moene, A.F.
Source In: Proceedings of the 20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction, American Meteorological Society 09-13 July 2012, Boston, USA. - American Meteorological Society - p. 6B.6 - 6B.6.
Event 20th Symposium on Boundary Layers and Turbulence/18th Conference on Air-Sea Interaction, Boston, 2012-07-09/2012-07-13
Department(s) Meteorology and Air Quality
WIMEK
Publication type Contribution in proceedings
Publication year 2012
Abstract In this study we are interested in obtaining the wind component perpendicular to a path, the so called crosswind, using scintillometer measurements. A scintillometer is a device that consist of a transmitter and receiver. The transmitter emits a light beam which is refracted in the turbulent atmosphere, causing light intensity fluctuations that are recorded by the receiver. A scintillometer obtains a path-averaged estimate of the crosswind. For certain applications this can be advantageous, e.g. monitoring the crosswind along airport runways. Past research mainly focused on dual aperture scintillometers that use the time delay between the two signals to estimate the crosswind (Wang et. al., 1981). In this study we use spectral techniques, which are also applicable to single aperture scintillometer measurements. The essence of the spectral techniques lie in the fact that the scintillation power spectrum shifts linearly along the frequency axes as a function of the crosswind. Therefore, a salient point in the spectrum also shift linearly across the frequency axis. Three algorithms with different salient points were used, namely the corner frequency, maximum frequency, and the cumulative spectrum algorithm, which all used different representation of the scintillation power spectrum. Clifford (1971) described a theoretical model of the scintillation spectrum. We used this model to calibrate our algorithms, instead of relying on experimental calibration. The algorithms were examined with data, of a boundary layer scintillometer and sonic anemometer, collected at the Haarweg (The Netherlands). The scintillation spectra were obtained with Fast Fourier Transformations and wavelets. Wavelets were used to obtain a well-defined spectra for short time intervals (<1 minute).
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