Estuarine beach stability during storms and recovery pathways

Research output: Contribution to conferenceAbstractResearch

Abstract

Beaches are a primary coastal defence, and provide significant economic and ecological benefits. Beach stability depends on the balance between erosion and recovery processes. Erosion is relatively well understood, however, recovery has been largely overlooked. In particular, low-wave energy estuarine beaches are highly vulnerable as they tend to be narrow, low-lying, prone to coastal flooding, and are sensitive to even small changes in wave climate. They are widespread globally, and often densely populated. Fundamental data of erosion and recovery pathways and rates are needed from estuarine beaches to reduce uncertainties in planning and management. This research focuses on the erosive impacts of storms on estuarine beaches, and recovery rates after an extreme storm event, relative to the geomorphic setting. This is a key missing parameter for determining the vulnerability of estuarine coasts to climate change. We focus on 8 estuarine beaches in Sydney (Australia), with various levels of exposure to ocean swells/ prevailing winds, and relationships to flood tidal deltas. We track erosion and recovery after a severe East Coast Low in June 2016, where peak waves (up to 17.7 m offshore maximum wave height) coincided with spring tides, and waves came from an unusual direction (NE). The worst erosion (0.88 m3/m) occurred at one of the most sheltered beaches with a westerly aspect, while accretion occurred on the eastern shore beaches. Simultaneously, the storm had negligible impact on the most exposed beaches. Recovery rates on the eroded beaches have been very slow (~0.07–0.2 m3/m/month), and largely below mean sea level. Almost one year after the erosive event, the upper beach and dune remain severely eroded. Preliminary analysis suggests ebb dominance, and the significantly stronger tidal current at the bottom suggest an important role of tidal currents in beach recovery.

Conference

ConferenceEuropean Geosciences Union (EGU) General Assembly 2018
Abbreviated titleEGU 2018
CountryAustria
CityVienna
Period8/04/1813/04/18
Internet address

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beach
erosion
tidal current
wave climate
coastal protection
coast
wave height
swell
wave energy
westerly
dune
vulnerability
tide
flooding
accretion
sea level
climate change
ocean
economics

Cite this

Gallop, S., Vila-Concejo, A., Fellowes, T., & Goodwin, I. (2018). Estuarine beach stability during storms and recovery pathways. Abstract from European Geosciences Union (EGU) General Assembly 2018, Vienna, Austria.
Gallop, Shari ; Vila-Concejo, Ana ; Fellowes, Thomas ; Goodwin, Ian. / Estuarine beach stability during storms and recovery pathways. Abstract from European Geosciences Union (EGU) General Assembly 2018, Vienna, Austria.1 p.
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abstract = "Beaches are a primary coastal defence, and provide significant economic and ecological benefits. Beach stability depends on the balance between erosion and recovery processes. Erosion is relatively well understood, however, recovery has been largely overlooked. In particular, low-wave energy estuarine beaches are highly vulnerable as they tend to be narrow, low-lying, prone to coastal flooding, and are sensitive to even small changes in wave climate. They are widespread globally, and often densely populated. Fundamental data of erosion and recovery pathways and rates are needed from estuarine beaches to reduce uncertainties in planning and management. This research focuses on the erosive impacts of storms on estuarine beaches, and recovery rates after an extreme storm event, relative to the geomorphic setting. This is a key missing parameter for determining the vulnerability of estuarine coasts to climate change. We focus on 8 estuarine beaches in Sydney (Australia), with various levels of exposure to ocean swells/ prevailing winds, and relationships to flood tidal deltas. We track erosion and recovery after a severe East Coast Low in June 2016, where peak waves (up to 17.7 m offshore maximum wave height) coincided with spring tides, and waves came from an unusual direction (NE). The worst erosion (0.88 m3/m) occurred at one of the most sheltered beaches with a westerly aspect, while accretion occurred on the eastern shore beaches. Simultaneously, the storm had negligible impact on the most exposed beaches. Recovery rates on the eroded beaches have been very slow (~0.07–0.2 m3/m/month), and largely below mean sea level. Almost one year after the erosive event, the upper beach and dune remain severely eroded. Preliminary analysis suggests ebb dominance, and the significantly stronger tidal current at the bottom suggest an important role of tidal currents in beach recovery.",
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author = "Shari Gallop and Ana Vila-Concejo and Thomas Fellowes and Ian Goodwin",
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Gallop, S, Vila-Concejo, A, Fellowes, T & Goodwin, I 2018, 'Estuarine beach stability during storms and recovery pathways' European Geosciences Union (EGU) General Assembly 2018, Vienna, Austria, 8/04/18 - 13/04/18, .

Estuarine beach stability during storms and recovery pathways. / Gallop, Shari; Vila-Concejo, Ana; Fellowes, Thomas; Goodwin, Ian.

2018. Abstract from European Geosciences Union (EGU) General Assembly 2018, Vienna, Austria.

Research output: Contribution to conferenceAbstractResearch

TY - CONF

T1 - Estuarine beach stability during storms and recovery pathways

AU - Gallop,Shari

AU - Vila-Concejo,Ana

AU - Fellowes,Thomas

AU - Goodwin,Ian

PY - 2018

Y1 - 2018

N2 - Beaches are a primary coastal defence, and provide significant economic and ecological benefits. Beach stability depends on the balance between erosion and recovery processes. Erosion is relatively well understood, however, recovery has been largely overlooked. In particular, low-wave energy estuarine beaches are highly vulnerable as they tend to be narrow, low-lying, prone to coastal flooding, and are sensitive to even small changes in wave climate. They are widespread globally, and often densely populated. Fundamental data of erosion and recovery pathways and rates are needed from estuarine beaches to reduce uncertainties in planning and management. This research focuses on the erosive impacts of storms on estuarine beaches, and recovery rates after an extreme storm event, relative to the geomorphic setting. This is a key missing parameter for determining the vulnerability of estuarine coasts to climate change. We focus on 8 estuarine beaches in Sydney (Australia), with various levels of exposure to ocean swells/ prevailing winds, and relationships to flood tidal deltas. We track erosion and recovery after a severe East Coast Low in June 2016, where peak waves (up to 17.7 m offshore maximum wave height) coincided with spring tides, and waves came from an unusual direction (NE). The worst erosion (0.88 m3/m) occurred at one of the most sheltered beaches with a westerly aspect, while accretion occurred on the eastern shore beaches. Simultaneously, the storm had negligible impact on the most exposed beaches. Recovery rates on the eroded beaches have been very slow (~0.07–0.2 m3/m/month), and largely below mean sea level. Almost one year after the erosive event, the upper beach and dune remain severely eroded. Preliminary analysis suggests ebb dominance, and the significantly stronger tidal current at the bottom suggest an important role of tidal currents in beach recovery.

AB - Beaches are a primary coastal defence, and provide significant economic and ecological benefits. Beach stability depends on the balance between erosion and recovery processes. Erosion is relatively well understood, however, recovery has been largely overlooked. In particular, low-wave energy estuarine beaches are highly vulnerable as they tend to be narrow, low-lying, prone to coastal flooding, and are sensitive to even small changes in wave climate. They are widespread globally, and often densely populated. Fundamental data of erosion and recovery pathways and rates are needed from estuarine beaches to reduce uncertainties in planning and management. This research focuses on the erosive impacts of storms on estuarine beaches, and recovery rates after an extreme storm event, relative to the geomorphic setting. This is a key missing parameter for determining the vulnerability of estuarine coasts to climate change. We focus on 8 estuarine beaches in Sydney (Australia), with various levels of exposure to ocean swells/ prevailing winds, and relationships to flood tidal deltas. We track erosion and recovery after a severe East Coast Low in June 2016, where peak waves (up to 17.7 m offshore maximum wave height) coincided with spring tides, and waves came from an unusual direction (NE). The worst erosion (0.88 m3/m) occurred at one of the most sheltered beaches with a westerly aspect, while accretion occurred on the eastern shore beaches. Simultaneously, the storm had negligible impact on the most exposed beaches. Recovery rates on the eroded beaches have been very slow (~0.07–0.2 m3/m/month), and largely below mean sea level. Almost one year after the erosive event, the upper beach and dune remain severely eroded. Preliminary analysis suggests ebb dominance, and the significantly stronger tidal current at the bottom suggest an important role of tidal currents in beach recovery.

KW - Coastal morphodynamics

KW - Physical oceanography

KW - Beach erosion

KW - Beach morphodynamics

M3 - Abstract

ER -

Gallop S, Vila-Concejo A, Fellowes T, Goodwin I. Estuarine beach stability during storms and recovery pathways. 2018. Abstract from European Geosciences Union (EGU) General Assembly 2018, Vienna, Austria.