scholarly journals Vegetation recovery on neighboring tidal flats forms an Achilles' heel of saltmarsh resilience to sea level rise

2019 ◽  
Vol 65 (1) ◽  
pp. 51-62 ◽  
Author(s):  
Zhenchang Zhu ◽  
Jim Belzen ◽  
Qin Zhu ◽  
Johan Koppel ◽  
Tjeerd J. Bouma
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Tidal Flats ◽  
Vegetation Recovery

scholarly journals Paraseqences in the Kotroman Formation, Western Serbia

2011 ◽  
pp. 63-69
Author(s):  
Nenad Banjac ◽  
Divna Jovanovic
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Tidal Flat ◽  
Tidal Flats ◽  
System Tracts

An attempt was made to describe two parasequences separated within the sediments of the Kotroman Formation at the Mokra Gora Village in western Serbia. The whole formation, of Albian-Cenomanian age, in some general characteristics corresponds to tidal flats, some of which were described in the literature (LARSONNEUR 1975), and the sediments were compared with ones from recent tidal flat environments. The heterogeneous composition of the Kotroman Formation influenced different authors to describe several non-synchronous and incomparable superpositioned packages. The parasequences were investigated in the attempt to correlate them with the stratigraphic age of the members. The parasequences were formed during the Albian transgression and represent a gradual deepening of the wider area. Well-developed flooding surfaces with significant deepening indicated retrogradational stacking of certain transgressive system tracts and reflect landward movement of the shoreline, indicating a gradual sea level rise.

Long-term area change of two tidal flats in Japan and its future projection due to sea level rise

2013 ◽  
Vol 165 ◽  
pp. 1975-1980
Author(s):  
Keiko Udo ◽  
Yuriko Takeda ◽  
Jun Yoshida ◽  
Akira Mano
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Tidal Flats ◽  
Future Projection ◽  
Area Change

Effects of mean sea level rise and tidal flat growth on tides and storm surge events in the Elbe estuary

2021 ◽  
Author(s):  
Tara Mahavadi ◽  
Elisabeth Rudolph ◽  
Rita Seiffert ◽  
Norbert Winkel
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Storm Surge ◽  
Tidal Flat ◽  
Tidal Flats ◽  
Water Levels ◽  
Elbe Estuary ◽  
Tidal Amplitude ◽  
Tidal Dynamics ◽  
Mean Sea Level

<p>Future mean sea level rise will influence tidal dynamics and storm surge events in estuaries. The bathymetry in estuaries and coastal areas will also be affected by mean sea level rise, since it is in a morphodynamic equilibrium with hydrodynamic forces. Tidal flats, which are an important component of coastal protection, will grow to a certain extent with mean sea level rise in case of sufficient sediment availability.</p><p>With the help of a highly resolved hydrodynamic-numerical model of the German Bight (North Sea), we analyse the potential influence of mean sea level rise and vertical growth of tidal flats on tidal dynamics and storm surge events in the Elbe estuary.</p><p>The results show an increase of tidal amplitude and storm surge water levels due to mean sea level rise. A bathymetric rise of tidal flats in the German Bight and the mouth of the Elbe estuary leads to a decrease in storm surge water level and tidal amplitude compared to the scenario with sole mean sea level rise without a change in bathymetry. Further analyses show, how geometric parameters of the Elbe estuary are changing due to mean sea level rise and tidal flat growth. These changes in geometry influence tidal dynamics and can therefore be an explanation for the observed changes in tidal amplitude and storm surge water levels.</p><p>These findings enable a better understanding of future changes in the Elbe estuary and support coastal managers in decision making processes concerning adaptation options to reduce the impacts of climate change.</p>

scholarly journals The Geomorphology of Farewell Spit and Its Sensitivity to Sea-Level Rise

2021 ◽  
Author(s):  
◽  
Helen M Tribe
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Spring Tide ◽  
Tidal Flats ◽  
Water Levels ◽  
Aerial Photographs ◽  
Storm Events ◽  
14C Dating ◽  
Sediment Reworking ◽  
High Degree

<p>Sand-dominated barriers are highly sensitive coastal systems which alter their morphology in response to rising sea level, undergoing extensive sediment reworking as wave activity reaches further inland. Farewell Spit, South Island, New Zealand, is a sand-dominated barrier spit which extends 25kms eastward from the mainland, enclosing the northwestern corner of the macro-tidal Golden Bay. During spring tide cycles low-lying areas of the Spit become completely inundated. The aim of this study is to establish the morphological stability of Farewell Spit and its potential response to the latest IPCC projected eustatic sea-level rise of 0.48m (A1B scenario) by the end of this century. GIS analysis of aerial photographs and the identification of 137Cs signatures within the dunes have shown a high degree of mobility in the Spit's features over the past 55 years. Vegetation increased by 75%, mainly due to the introduction of A arenaria, which has also led to the development of foredunes prograding up to 142m over the tidal flats. Barchan dunes on the Spit are also highly mobile migrating at up to 30m/y. The high amount of sediment movement along the spit is reflected in the sedimentology of the tidal flats, which show layers of aeolian transported fine, well-sorted sand several centimetres thick. The predominance of medium sand shows that reworking appears to have occurred on these flats due to storm events in Golden Bay, and like the dunes, 14C dating indicates they are very young features Projected sea-level rise was modelled to assess the vulnerability of low-lying areas of the Spit to tidal flooding. Deeper water levels in the two tidal channels which currently flood across the Spit are expected and there is a risk of additional channels opening, one being very near to the contact between the Spit and mainland. The mobility of the dune systems may however buffer some of these processes by providing natural defences against the sea. Barrier roll over does not appear to be an important process as it appears to be too wide to allow for washover. It is concluded that under current sea-level rise predictions Farewell Spit will not transgress landward but will be subject to exacerbated erosion.</p>

scholarly journals The Geomorphology of Farewell Spit and Its Sensitivity to Sea-Level Rise

2021 ◽  
Author(s):  
◽  
Helen M Tribe
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Spring Tide ◽  
Tidal Flats ◽  
Water Levels ◽  
Aerial Photographs ◽  
Storm Events ◽  
14C Dating ◽  
Sediment Reworking ◽  
High Degree

<p>Sand-dominated barriers are highly sensitive coastal systems which alter their morphology in response to rising sea level, undergoing extensive sediment reworking as wave activity reaches further inland. Farewell Spit, South Island, New Zealand, is a sand-dominated barrier spit which extends 25kms eastward from the mainland, enclosing the northwestern corner of the macro-tidal Golden Bay. During spring tide cycles low-lying areas of the Spit become completely inundated. The aim of this study is to establish the morphological stability of Farewell Spit and its potential response to the latest IPCC projected eustatic sea-level rise of 0.48m (A1B scenario) by the end of this century. GIS analysis of aerial photographs and the identification of 137Cs signatures within the dunes have shown a high degree of mobility in the Spit's features over the past 55 years. Vegetation increased by 75%, mainly due to the introduction of A arenaria, which has also led to the development of foredunes prograding up to 142m over the tidal flats. Barchan dunes on the Spit are also highly mobile migrating at up to 30m/y. The high amount of sediment movement along the spit is reflected in the sedimentology of the tidal flats, which show layers of aeolian transported fine, well-sorted sand several centimetres thick. The predominance of medium sand shows that reworking appears to have occurred on these flats due to storm events in Golden Bay, and like the dunes, 14C dating indicates they are very young features Projected sea-level rise was modelled to assess the vulnerability of low-lying areas of the Spit to tidal flooding. Deeper water levels in the two tidal channels which currently flood across the Spit are expected and there is a risk of additional channels opening, one being very near to the contact between the Spit and mainland. The mobility of the dune systems may however buffer some of these processes by providing natural defences against the sea. Barrier roll over does not appear to be an important process as it appears to be too wide to allow for washover. It is concluded that under current sea-level rise predictions Farewell Spit will not transgress landward but will be subject to exacerbated erosion.</p>

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