ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2020, Vol. 17, No. 7, pp. 9-18

The method of comparison of WAVEWATCH III model calculation results with the data of Ka-band radar

M.A. Panfilova 1 , A.M. Kuznetsova 1 , G.A. Baydakov 1, 2 , Yu.I. Troitskaya 1 , V.Yu. Karaev 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
2 A.M. Obukhov Institute of Atmospheric Physics RAS, Moscow, Russia
Accepted: 28.10.2020
DOI: 10.21046/2070-7401-2020-17-7-9-18
Numerical simulation of sea waves in Persian Gulf was conducted using WAVEWATCH III model for the two different source terms. The day typical for winter season with stable northwest wind was chosen for modeling. Comparison of mean square slope obtained from the Ka-band radar data and mean square slope from the model spectrum was performed. The radar operates at low incidence angles, and mean square slope is calculated within the frameworks of Kirchhoff approximation. The comparison is complicated by the following details. The part of the sea wave spectrum with wave length of decimeter band and shorter significantly contributes to the mean square slope from Ka-band radar data, while the shortest wave length in the spectrum from WAVEWATCH III model is of the order of meter. The method to calculate mean square slope from model data is presented. It implies integrating of the composite spectrum, which long-wave part is obtained by WAVEWATCH III model, while the descending part is from the sea wave spectrum model. The new method for validation of wave model by the satellite data is presented, where mean square slope plays the role of the parameter for comparison.
Keywords: numerical modeling of waves, parameterizations, Ka-band radar, mean square slope
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