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    Correlation between flood frequency and geomorphologic complexity of river network -A case study of Hangzhou China

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    Hydrology 2015.pdf (1.345Mb)
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    Publication date
    2015-08
    Author
    Guo, Yakun
    Zhang, S.
    Wang, Z.
    Keyword
    River networks, Floods frequency, Urban flood control, Geomorphological complexity, Correlation model, Hangzhou, China
    Rights
    © 2015 Elsevier. Reproduced in accordance with the publisher's self-archiving policy.
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    Urban flooding is a combined product of the climate and watershed geomorphology. River system is one of the vital components of watershed geomorphology. The geomorphic characteristics of rivers have important effect on the formation of flooding. However, there have been few attempts so far to investigate the relationship between flooding frequency, the probability of flooding, and the geomorphological complexity of river system. Such relationship is essential in order to predict likely responses of flooding frequency to the large-scale changes in the complexity of the river networks induced by accelerating urbanization around river. In this study we investigate the correlation between geomorphological characteristics of river system and the probability of flooding. Hangzhou city in China, which has suffered severe flooding, is chosen as a case study to evaluate this correlation and to investigate the impact of changes of drainage networks morphology on the local flooding. The fractal dimension, which is used to quantitatively assess geomorphological complexity of river network, is calculated by using box-counting method based on fractal geometry for eight sub river networks in Hangzhou. A model based on the correlation of flooding frequency and fractal dimension is established. The model is applied to investigate the effect of the rapid urbanization induced changes of river geomorphology on the local flood frequency in two typical regions in Hangzhou. The results show that the flood frequency/events increases with the decrease of fractal dimension of the river network, indicating that the geomorphologic complexity of river network has an important effect on flooding. This research has great referential value for future flood quantitative investigation and provides new method for urban flood control and river system protection.
    URI
    http://hdl.handle.net/10454/7790
    Version
    Accepted Manuscript
    Citation
    Zhang S, Guo Y & Wang Z (2015) Correlation between flood frequency and geomorphologic complexity of river network -A case study of Hangzhou China. Journal of Hydrology, 527: 113-118.
    Link to publisher’s version
    http://doi.org/10.1016/j.jhydrol.2015.04.060
    Type
    Article
    Collections
    Engineering and Informatics Publications

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