Author(s): Anne Jeanette De La Rosa; Maria Cristelle San Antonio; Kate Trishia Papina; Roy Anthony Luna; Ramon Quebral
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Keywords: Bed degradation; Sediment transport; Ground sill
Abstract: The 1991 Mt. Pinatubo eruption, which is the second-largest eruption of the 20th century, caused up to 6 cu. km. of lahar deposition on the Pasig-Potrero River. Due to the large river flow and size of the lahar grains comprising the riverbed, the river became prone to bank erosion and bed degradation that affected major infrastructures, such as the Pasig-Potrero Bridge. The Pasig-Potrero Bridge is located along the SCTEx (Subic-Clark-Tarlac Expressway), which is a 94-km expressway that connects the provinces of Zambales, Bataan, Pampanga and Tarlac in Central Luzon, Philippines. This portion of the Pasig-Potrero River is prone to sediment transport, in the form of scouring and degradation, which are expected to be aggravated during strong rainfall events. Numerous typhoon events caused further scouring of sand deposits, further exposing the piles of the piers of the bridge. Continuous quarrying at both upstream and downstream side of the bridge is an aggravating factor, which hasten the rate of scouring at the Pasig-Potrero Bridge.
Year: 2024