scholarly journals National assessment of shoreline change part 4: historical coastal cliff retreat along the California coast

2007 ◽  
Author(s):  
Cheryl J. Hapke ◽  
David Reid
Keyword(s):  
Shoreline Change ◽  
National Assessment ◽  
California Coast ◽  
Coastal Cliff ◽  
Cliff Retreat

scholarly journals The effects of storms and a transient sandy veneer on the interannual planform evolution a low-relief coastal cliff and wave-cut platform at Sargent Beach, Texas, USA

2021 ◽  
Author(s):  
Rose V. Palermo ◽  
Anastasia Piliouras ◽  
Travis E. Swanson ◽  
Andrew D. Ashton ◽  
David Mohrig
Keyword(s):  
Satellite Image ◽  
Storm Event ◽  
Erosion Rates ◽  
System A ◽  
Coastal Cliff ◽  
Sediment Cover ◽  
Evolving Model ◽  
The Impact ◽  
Cliff Retreat

Abstract. Coastal cliff erosion is alongshore-variable and episodic, with retreat rates that depend upon sediment as either tools of abrasion or protective cover. However, the feedbacks between coastal cliff planform morphology, retreat rate, and sediment cover are poorly quantified. This study investigates Sargent Beach, Texas, USA at the annual to interannual scale to explore (1) the relationship between temporal and spatial variability in both cliff retreat rate and roughness and (2) the response of retreat rate and roughness to changes in sediment cover of the underlying mud substrate and the impact of major storms, using the low-lying mudstone cliff as a rapidly evolving model of a larger cliff system. A storm event in 2009 increased the planform roughness and sinuosity of the coastal cliff at Sargent Beach, TX. Following the storm, satellite image-derived shorelines with annual resolution show a decrease in average alongshore erosion rates from 4 to 12 m yr−1, coincident with a decrease in shoreline roughness and sinuosity (smoothing). A storm event in 2017 again increased the planform roughness and sinuosity of the cliff. The occurrence of storms and the presence of sediment to laterally erode the cliff influence the planform morphology and subsequent retreat. Over shorter timescales, monthly retreat of the sea cliff occurred only when the platform was sparsely covered with sediment cover on the wave cut platform, indicating that the tools and cover effects can significantly affect short-term erosion rates. The timescale to return to a smooth shoreline with a long-term steady-state erosion rate following a storm or roughening event is approximately five years, with the long-term rate suggesting a minimum of ~38 years until Sargent Beach breaches, compromising the Gulf Intracoastal Waterway (GIWW) under current conditions and assuming no future storms or intervention. The observed retreat rate varies, both spatially and temporally, with cliff face morphology, demonstrating the importance of multi-scale measurements and analysis for interpretation of coastal processes and patterns of cliff retreat.

scholarly journals Documenting a Century of Coastline Change along Central California and Associated Challenges: From the Qualitative to the Quantitative

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2648 ◽  
Author(s):  
Gary Griggs ◽  
Lida Davar ◽  
Borja G. Reguero
Keyword(s):  
Coastal Erosion ◽  
Shoreline Change ◽  
Initial Step ◽  
Sandy Beaches ◽  
Change Analysis ◽  
The West ◽  
Central California ◽  
Coastline Change ◽  
Coastal Cliffs ◽  
Cliff Retreat

Wave erosion has moved coastal cliffs and bluffs landward over the centuries. Now climate change-induced sea-level rise (SLR) and the changes in wave action are accelerating coastline retreat around the world. Documenting the erosion of cliffed coasts and projecting the rate of coastline retreat under future SLR scenarios are more challenging than historical and future shoreline change studies along low-lying sandy beaches. The objective of this research was to study coastal erosion of the West Cliff Drive area in Santa Cruz along the Central California Coast and identify the challenges in coastline change analysis. We investigated the geological history, geomorphic differences, and documented cliff retreat to assess coastal erosion qualitatively. We also conducted a quantitative assessment of cliff retreat through extracting and analyzing the coastline position at three different times (1953, 1975, and 2018). The results showed that the total retreat of the West Cliff Drive coastline over 65 years ranges from 0.3 to 32 m, and the maximum cliff retreat rate was 0.5 m/year. Geometric errors, the complex profiles of coastal cliffs, and irregularities in the processes of coastal erosion, including the undercutting of the base of the cliff and formation of caves, were some of the identified challenges in documenting historical coastline retreat. These can each increase the uncertainty of calculated retreat rates. Reducing the uncertainties in retreat rates is an essential initial step in projecting cliff and bluff retreat under future SLR more accurately and in developing a practical adaptive management plan to cope with the impacts of coastline change along this highly populated edge.

Measuring coastal cliff retreat in the Kongsfjorden area, Svalbard, using terrestrial photogrammetry

2007 ◽  
Vol 26 (1) ◽  
pp. 14-21 ◽  
Author(s):  
Bjørn Wangensteen ◽  
Trond Eiken ◽  
Rune S. Ødegård ◽  
Johan Ludvig Sollid
Keyword(s):  
Coastal Cliff ◽  
Terrestrial Photogrammetry ◽  
Cliff Retreat
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