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Shoreline Response to a Sequence of Typhoon and Monsoon Events

2017; Multidisciplinary Digital Publishing Institute; Volume: 9; Issue: 6 Linguagem: Inglês

10.3390/w9060364

2073-4441

Rafaël Almar, Patrick Marchesiello, Luís Pedro Almeida, Duong Hai Thuan, Hitoshi Tanaka, Nguyen Trung Viet,

Tropical and Extratropical Cyclones Research

Shoreline continuously adapts to changing multi-scale wave forcing. This study investigates the shoreline evolution of tropical beaches exposed to monsoon events and storms with a case study in Vietnam, facing the South China Sea, over the particularly active 2013–2014 season, including the Cat-5 Haiyan typhoon. Our continuous video observations show for the first time that long-lasting monsoon events have more persistent impact (longer beach recovery phase) than typhoons. Using a shoreline equilibrium model, we estimate that the seasonal shoreline behavior is driven by the envelope of intra-seasonal events rather than monthly-averaged waves. Finally, the study suggests that the interplay between intra-seasonal event intensity and duration on the one hand and recovery conditions on the other might be of key significance. Their evolution in a variable or changing climate should be considered.