The erosion of the beaches on the coast of Alicante: Study of the mechanisms of weathering by accelerated laboratory tests

López, Isabel; López, M.; Aragonés, Luís; García-Barba, Javier; Sánchez, Isidro

doi:10.1016/j.scitotenv.2016.05.026

Cited by 23 publications

(18 citation statements)

References 12 publications

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“…All this confirms what has been observed by many other authors in different parts of the world (Anthony & Leth, 2002;Bascom, 1959;Horn & Walton, 2007;López et al, 2016;McLaren, 1981;Su et al, 2016).…”

Section: Discussionsupporting

confidence: 92%

Depth of closure: New calculation method based on sediment data

Aragonés

Pagán

López

et al. 2018

International Journal of Sediment Research

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Obtaining depth of closure (DoC) in an accurate manner is a fundamental issue for coastal engineering, since good results for coastal structures and beach nourishment depend mainly on DoC. Currently, there are two methods for obtaining the DoC, mathematical formulations and profile surveys. However, these methods can incur important errors if one does not take into account the characteristics and morphology of the area, or if one does not have a sufficiently long time series. In this work the DoC is obtained from the break in the trend of the sediment with the depth, that is, in general with the increase of the depth a decrease in the size of the sediment takes place. However, at one point this tendency changes and the size increases, and then decreases again. When comparing the point where the minimum sediment size occurs before the increase, it is observed that the error incurred is small compared to other methods. If the Standard Deviation of Depth Change (SDDC) method is considered as the most accurate method, the error incurred by the proposed method is less than 7%. In addition, it can be seen that the dispersion of the sediment method always occurs outside the zone of bar movement. Whereas in the methods of profiles survey (using 2 cm precision profiles), sometimes the DoC is obtained within the active zone of bar movement. In addition, where the relative minimum of the median sediment size is found, and the sizes of 0.063 and 0.125 mm predominate in the composition of the sample. Therefore, this new method allows the precise location of the DoC to be obtained in a fast and simple way. Furthermore, this method has the advantage that it is not affected by the modifications that may be experienced by both the study area and the cross-shore beach profile.

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Section: Discussionsupporting

confidence: 92%

Depth of closure: New calculation method based on sediment data

Aragonés

Pagán

López

et al. 2018

International Journal of Sediment Research

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“…This coast experiences a severe pressure of tourist inflow, and several beaches are subject to erosion (example study cases are References [53][54][55][56][57]). Artificial nourishment of beaches is common in this region, notably between 1985 and 1999 [58].…”

Section: Discussionmentioning

confidence: 99%

3-D Morphological Change Analysis of a Beach with Seagrass Berm Using a Terrestrial Laser Scanner

Corbí

Riquelme

Megías-Baños

et al. 2018

IJGI

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Along many Mediterranean coasts, the detached seagrass material of Posidonia oceanica creates seagrass berms that control the structure and morphodynamics of sandy beaches. Here, we show how Terrestrial Laser Scanner remote sensing data allows analyzing the 3-D morphologic change of beaches where this characteristic geomorphic structure is present. We propose a methodology for estimating accretion/erosion (almost −200 m 3 in our study) by considering the sand dominated and seagrass berms as two independent elements. For this purpose, two different sampling dates (named scenarios A and B, before and after an erosive heavy storms period, respectively) recorded in a microtidal pocket-beach (300 m 2 ) with these characteristic geomorphic structures have been modeled in 3-D. The present approach constitutes a cost-efficient, accurate, and quick tool to survey the sand volume in natural and artificial replenished beaches. The innovative approach, which can be considered as a conceptual and methodological starting point, can be useful to examine long-term and high-precision data sets in future studies of the morphodynamic evolution of these characteristic Mediterranean beaches.

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“…Wear processes are other natural factors that are necessary to consider. The dissolution of the carbonate fraction and breakage and separation of the components of the particles are processes that generate a reduction on the particle size, and result in a decrease on the median sediment size [17]. Therefore, by decreasing the size of the particle, this moves offshore, and when it crosses the depth of closure it can no longer return to the beach, causing the retreat of the coastline [13].…”

Section: Factors Affecting Coastal Erosionmentioning

confidence: 99%

“…In terms of natural factors that may influence coastal erosion, the morphology and composition of the sediment as well as the marine climate [8,9,[14][15][16]] can be highlighted. Thus, López et al [17] point out that sediment erosion is one of the natural erosion processes. This occurs by the dissolution of carbonates, the breakage of the particles as a result of the clash between them, and the separation of the mineral and the carbonated part of the particles.…”

Section: Introductionmentioning

confidence: 99%

Factors influencing the retreat of the coastline

López¹,

Pagán²,

López³

et al. 2017

Int. J. CMEM

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One of the main problems of coastlines around the world is their erosion. There are many studies that have tried to link coastal erosion with different parameters such as: maritime climate, sediment transport, sea level rise etc. However, it is unclear to what extent these factors influence coastal erosion. For example, the Intergovernmental Panel on Climate Change (IPCC) has predicted an increase in sea level at a much faster rate than that experienced in the first part of this century, reaching 1 m of elevation in some areas. Another factor to consider is the lack of sediment supply, since currently the contribution of new sediments from rivers or ravines is interrupted by anthropic activities carried out in their basins (dams, channelling, etc.). The big storms, increasingly frequent due to climate change, also should be considered, since they produce an offshore sediments transport, so that these cross the depth of closure, causing nonreturn of the sediment to the beach. Also, the sediment undergoes a process of wear due to various reasons such as the dissolution of the carbonate fraction and/or breakage and separation of the components of the particles. All these elements, to a greater or lesser extent, lead to the retreat of the coastline. Therefore, the aim of this study is to analyse the different factors causing the retreat of the coastline, in order to determine the degree of involvement of each of them and, therefore, be able to pose different proposals to reduce the consequences of coastal erosion.

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The erosion of the beaches on the coast of Alicante: Study of the mechanisms of weathering by accelerated laboratory tests

Cited by 23 publications

References 12 publications

Depth of closure: New calculation method based on sediment data

Depth of closure: New calculation method based on sediment data

3-D Morphological Change Analysis of a Beach with Seagrass Berm Using a Terrestrial Laser Scanner

Factors influencing the retreat of the coastline

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