Observations of wave attenuation, scour, and subsurface pore pressures acrossbthree marsh restoration sill structures on a sandy bed
| Autor: | Meagan Wengrove, Pedro Lomonaco, Jordan Converse |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
geography Marsh geography.geographical_feature_category 010504 meteorology & atmospheric sciences 010604 marine biology & hydrobiology Attenuation General Engineering 15. Life on land 01 natural sciences 6. Clean water Sill 13. Climate action General Earth and Planetary Sciences 14. Life underwater Geomorphology Geology 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Shore & Beach. :14-30 |
| ISSN: | 2641-7286 0037-4237 |
| DOI: | 10.34237/1008832 |
| Popis: | With rising sea levels and more frequent exposure to extreme storms, coastlines worldwide are vulnerable to increased erosion and loss of natural marsh lands. In an effort to lessen these impacts, there is a growing practice of adapting hard or “gray” coastline protection techniques to more nature-based features that promote habitat and ecosystem health. Living shoreline marsh restorations utilize natural and naturebased materials to protect marsh shores from erosion while also allowing intertidal flushing to promote the health and diversity of the marsh. Our study investigates three types of living shoreline sill designs exposed to average and storm-energy wave conditions at varying water levels. The sills were designed to mimic constructed sills in practice (rock, oyster shell, tree root wads), but more generally vary in structure porosity and material dissipation potential. Large-scale laboratory experiments were conducted in the large wave flume at the O.H. Hinsdale Wave Research Laboratory. Wave transmission and reflection are used to demonstrate wave attenuation capability of each sill structure. Scour of the sill, bedload sediment transport rates on the seaward and shoreward sides of the sill, and sediment pore-water vertical hydraulic gradients were used to demonstrate the potential for sediment transport and liquefaction. Results will contribute to understanding the effect of sill material porosity and mass on structure stability, and the effectiveness of using green living shoreline sill structures in the continued effort to establish design criteria for living shoreline implementation. |
| Databáze: | OpenAIRE |
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