September 7, 2021

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Ogul Doygun Coauthored a Paper on Assessing Roads Threatened by Coastal Erosion in Ocean & Coastal Management

Ogul Doygun, Ph.D., (California) coauthored a paper entitled "CRESI: A susceptibility index methodology to assess roads threatened by coastal erosion," published in Ocean & Coastal Management on in Volume 213 on November 1, 2021.

Horst Brandes was the lead author, and Ogul's coauthors were Oceana Francis, Guohui Zhang, Caroline Rossi, L. Yang, and Harrison Togia.

In this article, Ogul and his colleagues propose a new method to assess susceptibility of coastal roads to erosion. The article applies the new method to Hawaiian State roads and finds it useful and promising for government-, state-, and county-level road authorities and agencies, both as they assess coastal road erosion problems and as they make decisions about remediation measures. The article finds that the method can be applied to other coastlines around the world with only minor adjustments for local conditions.

Ogul Doygun is a Senior Staff Professional based in California focused on civil engineering, geotechnical engineering, and construction quality assurance. His experience also includes geotechnical design for civil engineering projects.

Ocean & Coastal Management explores all aspects of ocean and coastal management from the global to local levels. The journal publishes across disciplines, with a focus on relevance to management and/or governance issues key to the sustainable development and conservation of oceans and coasts.


A new method is proposed to assess the susceptibility of coastal roads to structural deterioration from shoreline erosion caused by natural processes such as waves, tides, and the effects of climate change, including sea level rise. The approach is based on a new susceptibility index method called the Coastal Road Erosion Susceptibility Index (CRESI) that incorporates key parameters that control road structure and coastal buffer resistance to erosion and impacts from the ocean side. The index was applied to a network of Hawaii State roads and an extensive set of field data and observations were collected throughout all the major islands. This data has been cataloged into a database of coastal road assets that continues to be expanded. Over 300 sites were assessed as part of the project. Based on the value of CRESI, vulnerable road sections were segmented into one of three levels of erosion susceptibility. In addition, the twenty most vulnerable locations were ranked, based largely on the CRESI index, for purposes of road management and planning. Ongoing work relating to improvements in the methodology to better account for traffic and a more accurate set of natural (ocean) processes with a potential hazard risk are also described. The proposed new methodology can be applied to other regions with only minor adjustments for local boundary conditions, if necessary. The results of the applied new method from Hawaiian state roads show that the methodology proves useful and promising for government-, state-, and county-level road authorities and agencies in the assessment of the coastal road erosion problems and their decision making with regard to corresponding remediation measures.

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