Urban Design, Vol. 1, Issue 1, Jun  2018, Pages 39-57; DOI: 10.31058/j.ud.2018.11004 10.31058/j.ud.2018.11004

Flood Control and Evaluation Study Based on Small Watershed Units and Urban Topography for Wuhan City

Urban Design, Vol. 1, Issue 1, Jun  2018, Pages 39-57.

DOI: 10.31058/j.ud.2018.11004

Jing Wu

School of Urban Design, Wuhan University, Wuhan, China

Received: 15 June 2018; Accepted: 25 August 2018; Published: 20 September 2018

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Abstract

In recent years, urban flooding has become increasingly frequent in Chinas major cities. As of 2017, more than 90% of cities in China have experienced urban flooding of varying degrees. The problem of urban flooding has become an important issue constraining urban development and residents safety. Based on this background, this paper selects Wuhan’s heavy rainstorm event n on July 6, 2016, and extracts the remote sensing image data of June 5, 2016 and July 23, 2016, respectively, and calculates urban flood accumulation density (UFAD) in Wuhan. Small watershed units (SWUs) based on hydrological perspectives are selected as the basis for regional classification. Based on the correlation analysis between UFAD and the topographical factors (elevation, relief and roughness) for SWUs, this paper quantifies the impacts of the topographical factors on UFAD, and then proposes the urban flooding risk grade for all SWUs. Based on this, it proposes the disaster mitigation control evaluation based on topographical factors for SWUs in Wuhan.

Keywords

Wuhan City, Small Watershed Unit, Disaster-Relief Terrain, Control Evaluation

Copyright

© 2017 by the authors. Licensee International Technology and Science Press Limited. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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