Preliminary analysis of storm surge overtopping safety of the proposed Tacloban-Palo-Tanauan Tide Embankment

Author: Karl Derrick S. Rizabal, Eric C. Cruz, Imee Bren O. Villalba

Presenter: Karl Derrick S. Rizabal

A coastal engineering analysis of the storm surge overtopping safety of the proposed 27.3-km-long Tacloban-Palo-Tanauan (TPT) tide embankment wall along Leyte’s eastern coastline is carried out. 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). 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.

Conference/s:

8th Regional Symposium on Infrastructure Development in Civil Engineering, 25-26 October 2018

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