| Autor: |
Feagin RA; School of Geography and the Environment, University of Oxford, Oxford, UK.; Department of Ecology and Conservation Biology, Texas A&M University, College Station, TX, USA.; Department of Ocean Engineering, Texas A&M University, College Station, TX, USA., Innocenti RA; Department of Ecology and Conservation Biology, Texas A&M University, College Station, TX, USA., Bond H; Department of Civil and Construction Engineering, Oregon State University, Corvallis, OR, USA., Wengrove M; Department of Civil and Construction Engineering, Oregon State University, Corvallis, OR, USA., Huff TP; Department of Ecology and Conservation Biology, Texas A&M University, College Station, TX, USA., Lomonaco P; Department of Civil and Construction Engineering, Oregon State University, Corvallis, OR, USA., Tsai B; Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, USA., Puleo J; Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, USA., Pontiki M; Department of Civil and Environmental Engineering, University of Delaware, Newark, DE, USA., Figlus J; Department of Ocean Engineering, Texas A&M University, College Station, TX, USA., Chavez V; Instituto de Ingenieria, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico., Silva R; Instituto de Ingenieria, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico. |
| Abstrakt: |
A broadly accepted paradigm is that vegetation reduces coastal dune erosion. However, we show that during an extreme storm event, vegetation surprisingly accelerates erosion. In 104-m-long beach-dune profile experiments conducted within a flume, we discovered that while vegetation initially creates a physical barrier to wave energy, it also (i) decreases wave run-up, which creates discontinuities in erosion and accretion patterns across the dune slope, (ii) increases water penetration into the sediment bed, which induces its fluidization and destabilization, and (iii) reflects wave energy, accelerating scarp formation. Once a discontinuous scarp forms, the erosion accelerates further. These findings fundamentally alter the current understanding of how natural and vegetated features may provide protection during extreme events. |
