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2016 Vol.49, Issue 7 Preview Page
Analysis of submerged flow characteristics of the improved-pneumatic-movable weir through the laboratory experiments

개량형 공압식 가동보의 잠김흐름 특성 분석을 위한 실험연구

Kyung Su Leea
,
Chang-Lae Jangb*
,
Namjoo Leec
이 경수a
,
장 창래b*
,
이 남주c
aNational Disaster Management Institute
bDept. of Civil Eng., Korea National University of Transportation
cDept. of Civil Eng., Kyungsung University
a국민안전처 국립재난안전연구원
b한국교통대학교 토목공학과
c경성대학교 토목공학과
*교신저자. *Corresponding Author. 
31 July 2016. pp. 615-623
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Abstract

This Study calculated the Submerged Flow Characteristics and Discharge coefficient by the rising angular change of the Improved-Pneumatic-Movable. According to the result, the smaller the ratio of weir height and weir length (L/W) or the weir standing angle, the bigger of the downstream head (H2). The change of discharge reduction factor (QsQ1), by the hight from weir crest to downstream surface and the ratio form weir crest to upstream water height (htH), was decreased when the htH closed to number 1. Although the weir water depth of the down-stream was shallower level than the up-stream, the velocity was faster then before. And the more the flow, the less the gab between the upper and lower reaches level. And when the same flow condition, the downstream head (H2) was increased when the L/W was bigger. The Submerged Flow Discharge coefficient of Improved-Pneumatic-Movable weir was made by the upstream approach flow head and the upper·lower stream flow condition, not by the physical data of Movable weir.

Keywords
Discharge Coefficient
Discharge Reduction Factor
Improved-Pneumatic-Movable Weir
Submerged Flow

본 연구에서는 개량형 공압식 가동보를 대상으로 가동보의 기립 각도변화에 따른 잠김흐름 특성을 분석하고 유량계수를 산정하였다. 실험결과, 위어마루에서 하류수면까지의 높이와 위어마루에서 상류 수면고 높이의 비(htH)에 대한 유량감소계수(QsQ1)의 변화는 htH가 1에 가까울수록 감소하였다. 따라서 보 하류에서의 수심은 상류보다 작지만 보를 통과하는 흐름으로 인해 하류 유속이 빠르게 나타났으며, 유량이 증가할수록 상·하류 수위차는 감소하는 것으로 나타났다. 또한 같은 유량조건인 경우 하류수두는 L/W가 클수록 크게 증가하였다. 개량형 공압식 가동보의 잠김흐름 유량계수는 가동보의 물리적 제원보다는 상류 접근흐름수두와 상·하류 흐름조건에 의하여 결정되었다.

키워드
개량형 공압식 가동보
유량계수
잠김월류흐름
유량감소계수
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 49
  • No :7
  • Pages :615-623
  • Received Date : 2016-03-18
  • Revised Date : 2016-06-07
  • Accepted Date : 2016-06-15
  • DOI :https://doi.org/10.3741/JKWRA.2016.49.7.615
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