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Title: 内湾の物質分散過程における潮流と恒流の相乗効果 (II)
Other Titles: THE COUPLING EFFECT OF THE TIDAL AND THE CONSTANT CURRENTS ON THE DISPERSION PROCESS IN THE INNER BAY (II)
Authors: 大西, 行雄  KAKEN_name
吉松, 康公  KAKEN_name
秋友, 和典  kyouindb  KAKEN_id
村本, 嘉雄  KAKEN_name
國司, 秀明  KAKEN_name
Author's alias: ONISHI, Yukio
YOSHIMATSU, Yasukimi
AKITOMO, Kazunori
MURAMOTO, Yoshio
KUNISHI, Hideaki
Issue Date: 1-Apr-1981
Publisher: 京都大学防災研究所
Journal title: 京都大学防災研究所年報. B = Disaster Prevention Research Institute Annuals. B
Volume: 24
Issue: B-2
Start page: 525
End page: 538
Abstract: To clarify the water dispersion mechanism in a channel with a complicated coastal geo-metry, some numerical experiments were made with a simple combination of the vortical flowA and the oscillatory flow B (CVOF model). The parameters A and B are the nondimen-sional intensities of these two types of flows which express the constant and the tidal flows inthe actual sea respectively. The followings are found. The coupling of two flows A and Byields the water dispersion. The nondimensional dispersion coefficient D is proportional toA2/B for smaller A/B and to AnB for larger A/B where n is about 2.47. The role of B islike as that of the eddy diffusivity K in the coupling effect of A and K on the dispersion.To examine CVOF model some hydraulic experiments were performed of dye dispersionin a channel, which is partitioned into 6 blocks with narrow openings by water breaksset (jetties) on both side walls alternately. The vortical flow is generated by the oscillatoryflow under the geometric effect of water breaks. It is found that CVOF model explains thepattern and the intensity of dye dispersion in the case when the oscillatory flow B is largeenough and when the opening is narrow enough. The larger dispersion coefficient isobtained for the narrower opening because of the coupling effect.
URL: http://www.dpri.kyoto-u.ac.jp/nenpo/nenpo.html
URI: http://hdl.handle.net/2433/70452
Appears in Collections:No.24 B-2

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