Author(s): Gee-Hyoung Kim; Gye-Woon Choi; Young-Kyu Kim
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Keywords: Channel junction; Main flow zone; Natural stream; Discharge ratio; Variation of water elevation at the cross section
Abstract: In this paper it would be defined flow behavior through variation of discharge ratio and hydraulic structures. The model area is in near Youngwol, Korea, and discharge boundary condition was 12, 090m3/sec after junction and the discharge ratio between main channel and lateral channel was 0. 99, 0. 85, 0. 72, 0. 67, 0. 57. The water depth was slowly up closed at the junction but after the junction the water depth was rapidly down. At that time, according to decrease discharge ratio the increased water depth was moved to downstream and the gap of water depth was smaller. Also, the variation ratio of water elevation was decreasing at the upstream of junction but it was increasing at the downstream of junction. The average velocity was decreasing toward junction from the most upstream, but at the junction area the velocity was increasing, so that the maximum velocity was represented at the right downstream section of the central junction area. The variation ratio of the maximum velocity was represented as bigger at the upstream of junction than at the downstream of junction. The main flow zone in junction area was moved to downstream and it was increasing the width according as increasing the discharge ratio.
Year: 2005