Izvorni znanstveni članak
NUMERICAL SIMULATION OF VORTEX SHEDDING OBSERVED AT THE HONG KONG INTERNATIONAL AIRPORT USING A SHALLOW MODEL
P.W. Chan
orcid.org/0000-0003-2289-0609
; Hong Kong Observatory, 134A Nathan Road, Kowloon, Hong Kong, China
C.M. Shun
; Hong Kong Observatory, 134A Nathan Road, Kowloon, Hong Kong, China
Sažetak
The Hong Kong International Airport is situated in an area of hilly terrain, with a number of hills to its northeast and on the mountainous Lautau Island to the south. In a stably stratified boundary layer, vortices shed by these hills arc sometimes observed by the Terminal Doppler Weather Radar (TDWR) and the Doppler Light Detection and Ranging (LIDAR) System operated by the Hong Kong Observatory. They have a length scale of at least several hundred metres and occur with a shedding period of 15 to 45 minutes. This paper uses a single-layer shallow water model to simulate the vortex shedding events observed in two wind regimes, namely, an easterly wind case on 19 January 2005 and a northeasterly wind case on 27 January 2002. The model wind field (resolved along the measurement radials of TDWR and LIDAR) and the vortex shedding periods in the simulations were found to be largely consistent with the TDWR and LIDAR observations. Though the dynamical equations are simplified and there is a single layer only, the shallow water model appears to grasp the basic dynamics of the observed shedding events.
Ključne riječi
vortex shedding; shallow water model; Doppler LIDAR; Terminal Doppler Weather Radar
Hrčak ID:
64406
URI
Datum izdavanja:
15.12.2005.
Posjeta: 862 *