The Philippines is prone to many coastal hazards such as, coastal erosion and tsunamis.
As for coastal erosion, many factors such as large waves, rising sea levels and strong winds can be a factor. But human interaction also has a devastating effect to coastal erosion. For example, the destruction of coral reefs in the Philippines has caused damage in that the reef proved a barrier to weaken the waves and now the waves are much stronger. The protection of coral reefs is very important because 97 percent of incident wave energy can dissipate with coral reefs.
Tsunamis are also a major hazard in the Philippines. Although the tsunamis in the Philippines are not as big as some of the more famously large tsunamis there destruction is real. The Moro Gulf tsunami of 1976 was one of the worst tsunamis to ever hit the Philippines. The tsunami had around 8,000 casualties, many of these casualties include people who were never found after the tsunami. The tsunami was brought on by a 8.1 magnitude earthquake in an ocean trench. The tsunami lead to mass erosion of the coastline, almost completely eroding older bedrock and moving sediments all the way to the mangroves. As we can see in the map below much of the coastline has experienced severe soil erosion, much of which small tsunamis have contributed
The main way the Philippines are trying to tackle these coastal hazards is seawalls. The seawall is meant to protect the towns near the coast, as well as the beaches from erosion. If the waves cannot reach the coastlines and the seawall protects the sand/sea cliffs, then there is minimal risk for erosion. References
https://ideas.repec.org/p/eep/pbrief/pb2009082.html
https://www.worlddata.info/asia/philippines/tsunamis.php#:~:text=A%20total%20of%2021%20tidal,a%20height%20of%20nine%20meters.
https://www.nationalmuseum.gov.ph/2021/11/05/tsunami-in-the-philippines-world-tsunami-awareness-day/
https://www.usgs.gov/centers/pcmsc/science/role-reefs-coastal-protection
https://r11.denr.gov.ph/index.php/rxi-maps
https://zamboanga.com/z/index.php?title=File:Minuhang,_Barugo_Sea_Wall_built_by_local_community.jpg
