Watching the Beach Steadily Disappearing: The Evolution of Understanding of Retrogressive Breach Failures
| Autor: | Konrad Beinssen, Dick R. Mastbergen, Yves Nédélec |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
History
liquefaction 0211 other engineering and technologies Ocean Engineering 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Natural (archaeology) lcsh:Oceanography lcsh:VM1-989 Forensic engineering lcsh:GC1-1581 021101 geological & geomatics engineering 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering coastal erosion embankment Shore geography geography.geographical_feature_category Flood myth Shoal lcsh:Naval architecture. Shipbuilding. Marine engineering dredging Coastal erosion flow slide Current (stream) slope stability submarine landslide Mechanism (sociology) Submarine landslide |
| Zdroj: | Journal of Marine Science and Engineering, Vol 7, Iss 10, p 368 (2019) Journal of Marine Science and Engineering Volume 7 Issue 10 |
| ISSN: | 2077-1312 |
| Popis: | Retrogressive breach failures or coastal flow slides occur naturally in the shoreface in fine sands near dynamic tidal channels or rivers. They sometimes retrogress into beaches, shoal margins and riverbanks where they can threaten infrastructure and cause severe coastal erosion and flood risk. Ever since the first reports were published in the Netherlands over a century ago, attempts have been made to understand the geo-mechanical mechanism of flow slides. In this paper we have established that events, observed during the active phase, are characterized by a slow but steady retrogression into the shoreline, often continuing for many hours. This can be explained by the breaching mechanism, as will be clarified in this paper. Recently, further evidence has become available in the form of video footage of active events in Australia and elsewhere, often publicly posted on the internet. All these observations justify the new term &lsquo retrogressive breach failure&rsquo (RBF event). The mechanism has been confirmed in flume tests and in a field experiment. With a better understanding of the geo-mechanical mechanism, current protection methods can be better understood, and new defense strategies can be envisaged. In writing this paper, we hope that the coastal science and engineering communities will better recognize and understand these intriguing natural events. |
| Databáze: | OpenAIRE |
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