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Use of basin outlet velocity to determine the basin concentration time and storage coefficientopen access

Authors
Lee, JinwookYoo, Chulsang
Issue Date
10월-2022
Publisher
IWA PUBLISHING
Keywords
Chungju Dam basin; Clark unit hydrograph; concentration time; peak velocity; rainfall-runoff event; storage coefficient
Citation
HYDROLOGY RESEARCH, v.53, no.10, pp.1304 - 1320
Indexed
SCIE
SCOPUS
Journal Title
HYDROLOGY RESEARCH
Volume
53
Number
10
Start Page
1304
End Page
1320
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/146580
DOI
10.2166/nh.2022.066
ISSN
1998-9563
Abstract
Most empirical formulae for the basin concentration time (T-c) and storage coefficient (K) focus on estimating the representative values under the ordinary condition, with their return period being a maximum of 100-200 years. Under more extreme conditions, those parameters should be modified to consider faster velocity conditions. The main objective of this study is to examine the possibility of determining these parameters corresponding to the given peak velocity (V-p) at the basin outlet. Two issues are involved in this problem; one is whether T-c can be fully expressed by V-p, while the other is whether K is still linearly proportional to T-c under extreme conditions. In this study, these two issues are resolved by the theoretical review of these parameters, as well as an analysis of the rainfall-runoff events collected at the Chungju Dam basin, Korea. It is observed that as V-p increases, T-c and K decrease. Their relationship is close to inverse but in linear proportion. That is, strong linear relationships are found among T-c, K, and V-p. As a result, the ratio of K to T-c is found to be almost identical, regardless of V-p. This ratio at a basin can be assumed as a basin characteristic that is unchanged, regardless of the size of rainfall events.
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Yoo, Chul sang
공과대학 (건축사회환경공학부)
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