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Flow Structure and Turbulence Characteristics in Meandering Channel
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사행수로의 흐름구조 및 난류특성

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Type
Academic journal
Author
Journal
KOREAN SOCIETY OF CIVIL ENGINEERS JOURNAL OF THE KOREAN SOCIETY OF CIVIL ENGINEERS B Vol.26 No.5B KCI Accredited Journals
Published
2006.9
Pages
469 - 479 (11page)

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Flow Structure and Turbulence Characteristics in Meandering Channel
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1n order to investigate characteristics of the primary flow and the secondary currents in meandering channels, the laboratory experiments were conducted in S-curved channels with angle of bend, 150°, and sinuosity of 1.52. The experimental conditions was decided varying average depth and velocity. Under these experimental conditions, spatial variations of the secondary currents in multiple bends were observed. The experimental results revealed that the distribution of primary flow in straight section is symmetric without respect to the experimental condition and the maximum velocity line of the primary flow occurs along the shortest path in experimental channel, supporting the result of previous works. The secondary currents in second bend became more developed than those in first bend. Particularly, the outer bank cell developed distinctively and the secondary current intensity was low at the straight section and high at the bends, periodically. Also, the secondary current intensity at the bends was as twice to three times as that at the straight section, and has its maximum value at the second bend. The turbulent flow characteristics of meandering channel was investigated with turbulent intensity of the primary flow and Reynolds shear stress. It was observed that the turbulent intensity is increasing when the velocity deviation of the primary flow is large whereas Reynolds shear stress increases when both the velocity deviation of the primary flow and the secondary current are large.
#meandering channel #secondary currents #primary flow #secondary current intensity #turbulent intensity #Reynolds shear stress #사행수로 #이차류 #주 흐름 #이차류 강도 #난류 강도 #Reynolds 전단응력

Contents

Abstract
요지
1. 서론
2. 이차류 이론
3. 사행수로 실험
4. 실험결과 분석
5. 결론
감사의 글
참고문헌

References (21)

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[학술지(정기간행물)] - / 2005 / LES를 이용한 복단면 사행수로에서의 흐름특성 분석 google schola [학술지(정기간행물)] - / 2004 / 21세기 프론티어 연구개발사업 수자원의 지속적 확보기술 개발사업 하천흐름 및 하상변동 해석기술 개발 google schola [학술지(정기간행물)] - / 2004 / 사행수로에서 흐름특성에 관한 실험적 연구 : 527 ~ 540 google schola [학술지(정기간행물)] - / 2005 / 복단면 사행 하도의 흐름특성에 대한 실험 연구 대한토목학회 (25권 3b) : 197 ~ 206 google schola [학술지(정기간행물)] - / 1985 / Transverse mixing in meandering laboratory channels with rectangular and naturally varying cross sections. Technical Report CRWR-205 of texas google schola

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