Abstracts for the 6th International GAME Conf.
3-5 December 2004
Kyoto Japan
Enhancing Precipitation by the Special Topography
Cheng Xingwu (1), Xu Hui (1), Qian Mingkai (1), Liang Shuxian (1), Xu Sheng (1)
(1) Huaihe River Commission of MWR, China
Enhancing precipitation by mountain is topographic forcing effect, there are many research results about special topography, such as Wu zi mountain in Hainan island. Some results have indicated the physical mechanism of the mountain-valley breeze and sea-land breeze Himalaya mountain(Everest) , being concerned in any GCM modal, is a typical example. Because so many mountains are different in the world, the results of orographic precipitation is different. This paper has analysed on enhancing precipitation by Da Bie Mountain (DBM). DBM is located in the southwest of the Huaihe river basin, upper reaches of Huaihe river. It is toward from southeast to northwest, the average height of DBM is ranged from 300 to 500 meter, the top of mountain is, Bai Ma Jian, 1774 meter high. During flood period (from later May to September) each year, the monsoon of east Asia carrying moisture from southwest often passes over the DBM, air flow is in quadrature with DBM, the dynamical convection and heat are forced by the topography ,positive vorticity is increased and also dynamic trough is strengthened when air flow pass over the mountain, as well caused the more intensity and frequent rainstorm appeared in northern of the DBM. The phenomenon can been explained by the theory of conservation of potential vorticity. Diagnostic study by used of Petterssen theory showed enhancing precipitation is because of the change of vorticity advection, temperature advection and adiabatic heating by the special topography.
Submittal Information
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The Hydrological Bureau of the Huaihe River Commission, MWR, P.R.China | |
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No 41 West Fengyang road, Bengbu, 233001, Anhui Province, P.R.China | |
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