Numerical Simulation of Terrain Effects of the Helan Mountain on A Rainstorm Process in Yinchuan, Ningxia, China
Received date: 2014-03-05
Revised date: 2014-04-16
Online published: 2015-03-20
The Helan Mountain is an important boundary of arid region and semi-arid region in northwestern China, but it is not clear how the topography impacts on the process of some heavy precipitation yet. In this article, the rainstorm occurred in Yinchuan during July 29-30 of 2012 was simulated and terrain sensitivity experiment of the Helan Mountain was performed by mesoscale numerical model WRFV3.4. The results indicated that the Helan Mountain promotes and strengthens the generation of low-level around flow cyclonic, vertical motion, divergence and moisture flux divergence in Yinchuan area. The promotion and strength are an important cause to produce the rainstorm. Vertical motion, divergence and moisture flux divergence strengthen and low-level flow shear convergence appears in the east of the Tengger Desert to the west of the Helan Mountain after smoothing the Helan Mountain terrain, which enhances the precipitation and expands the scope of the precipitation in the Tengger Desert. It was concluded that some heavy precipitation events which happened in Yinchuan to the east of the Helan mountain was strengthened by the Helan Mountain, however it has an obvious adverse effect on the precipitation events which happened in the east of the Tengger Desert to the west of the mountain.
Key words: rainstorm; Yinchuan; Helan Mountain; sensitivity experiment; Tengger Desert
Ning Guicai , Shang Kezheng , Wang Shigong , Ma Minjin , Zhao Wenjing . Numerical Simulation of Terrain Effects of the Helan Mountain on A Rainstorm Process in Yinchuan, Ningxia, China[J]. Journal of Desert Research, 2015 , 35(2) : 464 -473 . DOI: 10.7522/j.issn.1000-694X.2014.00040
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