ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 45 Issue 5 > 2019,45(5):641-650. DOI:10.7519/j.issn.1000-0526.2019.05.005 Prev Next
Simulation of Wire Ice Thickness During a Freezing Rain Process in Henan Province
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Abstract:
The atmospheric circulation analysis and ice thickness simulation are conducted to the freezing rain process in Henan Province in 8-11 February 2010 by using the Weather Research and Forecasting (WRF) mesoscale numerical model coupled with the Jones ice thickness model. The results show that: (1) The emergence of an intense inversion layer and the mixing of cold and warm air masses above Henan and northern Anhui reached the freezing weather conditions. (2) The simulated precipitation and 10 m wind direction and wind speed were similar to the observed values, but the intensity of the simulated precipitation center was slightly larger. (3) The simulated wire ice accretion appeared and developed rapidly when the surface temperature went below 0℃. In the icing growth and maintenance phase, the vertical temperature and hydrate simulation results show that the height and low altitude configuration is consistent with the change trend of ice thickness. Ice accretion first appeared to the north of Funiu Mountain, and then extended to the southeast. The evolution of the simulated ice range and the thickness of the wire ice accretion generally coincided with the observed data, which proves that this model can be applied to the prediction of ice accumulation in Henan Province. (4) The simulated ice thickness was too large in some areas, which might be attributed to many reasons, for example, as simulation demands highly accurate terrain data, the simulated wind speed is too large, the angle between the wind direction and the electric wire is ideally assumed, and the threshold range of the Jones ice model is narrowed. Although the WRF model of ice thickness has some capability in the simulation of wire ice accretion, it still needs further improvement.
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