Wave Overtopping Discharge for Very Gently Sloping Foreshores
The spectral wave period Tm-1,0 at the toe of sea-dikes is a crucial parameter to predict wave overtopping discharge over sea-dikes. It is known from literature that this period quickly increases when waves reach shallow foreshores; however, sometimes the assumption is made that the wave period rema...
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doaj-9f304eac852c4f8d87a1ec671eceaa762020-11-25T02:51:48ZengMDPI AGWater2073-44412020-06-01121695169510.3390/w12061695Wave Overtopping Discharge for Very Gently Sloping ForeshoresThu-Ha Nguyen0Bas Hofland1Vu Dan Chinh2Marcel Stive3Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The NetherlandsFaculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The NetherlandsFaculty of Coastal and Offshore Engineering, National University of Civil Engineering, Hanoi 100000, VietnamFaculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The NetherlandsThe spectral wave period Tm-1,0 at the toe of sea-dikes is a crucial parameter to predict wave overtopping discharge over sea-dikes. It is known from literature that this period quickly increases when waves reach shallow foreshores; however, sometimes the assumption is made that the wave period remains constant from offshore to near-shore, leading to an underestimation of the near-shore wave period. Several formulae have been proposed to resolve the underestimation of wave overtopping discharges for very shallow foreshores. These corrective formulations confirm the tendency of underestimating the overtopping discharges over a very gently sloping foreshore but are not validated for foreshore slopes gentler than 1:500. The “equivalent slope” method based on a recent study is inappropriate for these very gently sloping foreshores due to the breaker parameter being much smaller than seven. This study proposes an extension of the correction and finds that spectral wave periods can reach values two times those offshore.https://www.mdpi.com/2073-4441/12/6/1695SWANSWASHwave overtoppingLF wavesTm−1,0(very) shallow foreshore |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Thu-Ha Nguyen Bas Hofland Vu Dan Chinh Marcel Stive |
spellingShingle |
Thu-Ha Nguyen Bas Hofland Vu Dan Chinh Marcel Stive Wave Overtopping Discharge for Very Gently Sloping Foreshores Water SWAN SWASH wave overtopping LF waves Tm−1,0 (very) shallow foreshore |
author_facet |
Thu-Ha Nguyen Bas Hofland Vu Dan Chinh Marcel Stive |
author_sort |
Thu-Ha Nguyen |
title |
Wave Overtopping Discharge for Very Gently Sloping Foreshores |
title_short |
Wave Overtopping Discharge for Very Gently Sloping Foreshores |
title_full |
Wave Overtopping Discharge for Very Gently Sloping Foreshores |
title_fullStr |
Wave Overtopping Discharge for Very Gently Sloping Foreshores |
title_full_unstemmed |
Wave Overtopping Discharge for Very Gently Sloping Foreshores |
title_sort |
wave overtopping discharge for very gently sloping foreshores |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2020-06-01 |
description |
The spectral wave period Tm-1,0 at the toe of sea-dikes is a crucial parameter to predict wave overtopping discharge over sea-dikes. It is known from literature that this period quickly increases when waves reach shallow foreshores; however, sometimes the assumption is made that the wave period remains constant from offshore to near-shore, leading to an underestimation of the near-shore wave period. Several formulae have been proposed to resolve the underestimation of wave overtopping discharges for very shallow foreshores. These corrective formulations confirm the tendency of underestimating the overtopping discharges over a very gently sloping foreshore but are not validated for foreshore slopes gentler than 1:500. The “equivalent slope” method based on a recent study is inappropriate for these very gently sloping foreshores due to the breaker parameter being much smaller than seven. This study proposes an extension of the correction and finds that spectral wave periods can reach values two times those offshore. |
topic |
SWAN SWASH wave overtopping LF waves Tm−1,0 (very) shallow foreshore |
url |
https://www.mdpi.com/2073-4441/12/6/1695 |
work_keys_str_mv |
AT thuhanguyen waveovertoppingdischargeforverygentlyslopingforeshores AT bashofland waveovertoppingdischargeforverygentlyslopingforeshores AT vudanchinh waveovertoppingdischargeforverygentlyslopingforeshores AT marcelstive waveovertoppingdischargeforverygentlyslopingforeshores |
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