Hydrodynamic analysis of Leyte Tide Embankment against coastal flooding due to Typhoon Haiyan 2013

Author: Karl Derrick S. Rizabal, Eric C. Cruz

Presenter: Eric C. Cruz

The Leyte Tide Embankment (LTE), also called Tacloban-Palo-Tanauan Tide Embankment, is a 27.3km-long national coastal infrastructure that, when completed, is expected to protect the coastal areas of Tacloban, Palo, and Tanauan which were among the worst-affected by Typhoon Haiyan (Yolanda) 2013. This paper resulted from a desktop-based computational analysis of the effectiveness of the LTE against the storm tide overtopping safety of the tide embankment wall along Leyte’s eastern coastline. The embankment alignment and cross-section data are based on published documents by JICA and DPWH, while offshore and local bathymetry and coastal topography data are taken from secondary sources. Meteorological loading is based on the cyclonic surface winds and translating pressure fields of Typhoon Yolanda (Haiyan) 2013, while tide loading along open boundaries is based on a harmonic tide predictor. A mesoscale unstructured mesh is used to numerically implement the ADCIRC storm surge model utilizing depth-adaptive finite elements to optimize the mesh. Results of storm tide levels (STL) under Yolanda 2013 loading indicate that the entire length of the embankment wall would be overtopped, and that the overtopping duration would be as long as 110 minutes in the southern sections (Palo and Tanauan). Storm waves were not modeled, so the results are deemed lower than the final wave overtopping values. The study’s results have important ramifications to the design basis of the TPT embankment, particularly to the disaster mitigation plans after the embankment is overtopped.


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