Flood hazard assessment for bridge crossings over ephemeral channels: a case study of the Murcia coast (SE Spain)

Authors

  • C. Conesa-García University of Murcia
  • R. García-Lorenzo Autonomous Community of Murcia Region, Environmental Integration and Information Service

DOI:

https://doi.org/10.18172/cig.2507

Keywords:

floods, bridge crossings, ephemeral channels, hazard index, South East Spain

Abstract

Bridges are usually built when traffic or the importance of the road network justifies the cost. Most road bridges are permanent structures and are vulnerable to extreme hydrologic events. Streams, particularly in semiarid regions, can significantly overflow their banks and may change course, defying the bridge’s ability to perform its intended function. This article proposes a way of assessing flood hazards at bridge crossings over ephemeral streams. Two hazard indices associated with floodwaters at bridge crossings have been tested for ephemeral channels on the South-East coast of Spain: a Flood Hazard Index for bridge crossings (FHIBC), and a Geomorphological Hazard Index (GHIBC). FHIBC is based on the exposure and effectiveness of drainage works for dealing with floods of different return period. The second index, GHIBC, integrates parameters related to hydraulic resistance and potential bed erosion in large floods. Variables such as granular bed susceptibility to incision, critical velocity and transitory scouring have previously been estimated based on field data. The results show that FHIBC is an appropriate index for obtaining an overall evaluation of the flood hazard at this crossing type, while GHIBC provides useful information on the main hydromorphological factors which endanger the stability of the bridges over ephemeral streams. The joint implementation of both indices may also be an efficient tool for identifying high-risk crossings and improving the planning of future infrastructures over channels in the study area.

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Author Biographies

C. Conesa-García, University of Murcia

Department of Physical Geography, University of Murcia,
Campus de la Merced, 30001 Murcia, Spain

R. García-Lorenzo, Autonomous Community of Murcia Region, Environmental Integration and Information Service

Autonomous Community of Murcia Region,  Environmental Integration and Information Service, C/ Catedrático Eugenio Ubeda, s/n, 30008 Murcia, Spain

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Published

06-03-2014

How to Cite

1.
Conesa-García C, García-Lorenzo R. Flood hazard assessment for bridge crossings over ephemeral channels: a case study of the Murcia coast (SE Spain). CIG [Internet]. 2014 Mar. 6 [cited 2024 Apr. 18];40(1):119-46. Available from: https://publicaciones.unirioja.es/ojs/index.php/cig/article/view/2507