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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Study on the control discharge characteristics of the tangential intake structure of the deep tunnel...
Study on the control discharge characteristics of the tangential intake structure of the deep tunnel storage system in korea
Author : Jun Oh OH (1), Jae-Hyeon Park (2) Chang Geun Park (3)
Due to the change of the rapid urbanization and the characteristics of the precipitation, specially the storage capacity of
the urban watershed has been decreased, so the flood mitigation policy using the deep tunnel system has been used for
decades in some countries. In the case of Japan, the underground storage tunnels such as the Sinwogi, the Naniwa, the
Yodo, the Otsu have been used as the flood protection structures. In Korea, the interest of these underground facilities
has been increased because of increasing of the flood damage in the metropolitan areas, and the deep tunnel systems
has been applied at Shinwol area in Seoul as the flood protection policy.
In this study, the hydraulic characteristics of the vortex type intake structure of the deep tunnel was analyzed through the
hydraulic model experiments specially for the tangential intake structure including the design factors such as drop shaft
diameter (D), inflow channel width (B), inflow channel length (L), inflow channel angle (), join angle inflow channel and
drop shaft (). Yu(2009) etc. suggested the control discharge formula for the the tangential intake structure, which indicate
the proper design guideline. In our research The 4 cases hydraulic model experiment has fulfilled, and compared with the
theoretically calculated data and experimental data of Qc and yc respectively. Experimental results were compared and
analyzed divided into three ranges according to the ratio of the measured and calculated control discharge (Qc(m)/Qc(p)),
and the design factor ratios such as e/B z/L, L/B, z/B, the e/z. The each factor ratios in these three ranges were analyzed
by sensitivity analysis.
In the case of less than 0.8, Qc(m)/Qc(p) have been mainly determined by e, z, , which are influence factors on contorl
discharge, If Qc(m)/Qc(p) is 1.2 or more, the influence of is negligible, but e and z have a significant affects on the
control discharge. In the case that Qc (m)/Qc(p) is increasing from 0.8 to 1.2, the effect of is decreased. The Yus
proposed control discharge equation(2009) shows the approaching channel length(L) is negligible in the case of same e/B,
but the experiment data shows the approaching channel length(L) is very important factor, so the factors of the control
discharge equation should be revised by the adjustment of the weighted factors through the more researches.
File Size : 812,253 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 28/08/2015
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