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Water 2015, 7(8), 4129-4143; doi:10.3390/w7084129

Analysis of Urban Drainage Networks Using Gibbs’ Model: A Case Study in Seoul, South Korea

1
Department of Civil Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan 712-749, Korea
2
Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-ro, Goyang 411-712, Korea
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 6 May 2015 / Revised: 14 July 2015 / Accepted: 23 July 2015 / Published: 28 July 2015
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Abstract

Drainage networks are essential compartments in an urban infrastructure system for the efficient collection and prompt drainage of flood water. In addition to the advances in numerical techniques on urban flood simulation, the topological characteristics of urban drainage networks and their impacts on flooding have not been investigated thoroughly despite their importance. This study evaluated the urban drainage networks in Seoul, South Korea, in terms of the network configuration and its implication for peak flows and flood mitigation. Gibbs’ model was used to analyze the network configuration of 31 urban catchments with various slope ranges. The results showed that urban drainage networks can be less efficient than river in nature in terms of the drainage time, which is counter-intuitive. On the other hand, the analysis showed that efficient networks have risks of flood concentration and, hence, increase potential flood risks. This study showed that efficient networks tend to have higher peak flows at the outlet and vice versa. Therefore, an alternative drainage network layout, which is less efficient and more sinuous, was introduced and it resulted in reduced peak flows and flooding. This result shows managing a proper drainage network layout can contribute to flood mitigation in urban catchments. View Full-Text
Keywords: urban catchment; drainage network; flood mitigation; Gibbs’ model; stochastic network model urban catchment; drainage network; flood mitigation; Gibbs’ model; stochastic network model
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Seo, Y.; Hwang, J.; Noh, S.J. Analysis of Urban Drainage Networks Using Gibbs’ Model: A Case Study in Seoul, South Korea. Water 2015, 7, 4129-4143.

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