Mangroves are one of the coastal vegetation ecosystems that grow in intertidal areas in tropical and subtropical regions (Giri et al., 2011). They are characterized by complicated patterns of above-ground root systems (Ezcurra
This paper reports the post-disaster survey results of storm surge and waves due to Super Typhoon Meranti (local name: Ferdie), along the coastline of the province of Batanes, Philippines. The survey was conducted by a joint survey team of the University of Tokyo and University of the Philippines from 9 to 12 October 2016, about one month after the disaster. Water levels in the inundated area or runup heights were measured at 37 locations along the coast of the islands of Batan and Sabtang by interviewing local residents and by examining wave runup evidences remaining along the coast. Obtained runup and inundation levels showed significant variations along the coast of islands and higher levels were found on the coast facing north. Especially at Ivana, a small coastal community located at the southwestern tip of the island of Batan, the coast was covered by a convexshaped fringing reef and observed inundation heights were locally concentrated behind the peak of the convex-shaped reef.
The Philippines, being an archipelagic country with at least 36,000 km of coastline, has been identified to have more than 20 areas that are at risk of coastal erosion. One of these areas, located in Ibajay, Aklan, was studied wherein a 3-dimensional numerical model using Delft3D was created in order to simulate and analyze the prevailing hydrodynamics and sediment transport. The model was calibrated using continuous water level and velocity data obtained from sensors deployed during two separate field surveys. Model results showed excellent agreement with observed data and sufficiently captures the existing tidally dominated hydrodynamics of the study area. The temporal variability of the hydrodynamics and transport of sediments was investigated by simulating flows during flood-ebb, spring-neap, southwest-northeast monsoon, and 2-year long conditions. Areas of erosion and deposition were identified based on the results of the long-term simulation. None of these areas were located along the coastline except on the area near the stream where local erosion and deposition happens. Based on this, it can be concluded that the study coast is stable under prevailing tidal conditions. The obtained results can be used as baseline data for managing future coastal developments of the municipality and the methodology conducted in this research can be applied on other erosion-prone coastlines nationwide.
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