The erosion on the east coast of Spain: Wear of particles, mineral composition, carbonates and Posidonia oceanica

López, M.; López, Isabel; Aragonés, Luís; Serra, José Cristobal; Esteban, Victor

doi:10.1016/j.scitotenv.2016.08.076

Cited by 15 publications

(8 citation statements)

References 25 publications

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“…In addition, we conducted a batch experiment in the laboratory with 60L of filtered seawater and 55 g (dry weight) of typical coastal sandy sediments from the Eastern Spanish margin (40.358 ºN, 0.402 ºE) with c.a. 30% of carbonates and 70% of mineral phases dominated by quartz (López et al, 2016). The container was shaken daily to ensure sediment suspension.…”

Section: Sampling and Methodsmentioning

confidence: 99%

Balancing Rare Earth Element distributions in the Northwestern Mediterranean Sea

García-Solsona

Jeandel

2020

Chemical Geology

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Elemental concentrations of Rare Earth Elements (REE) and isotopic compositions of Neodymium ( Nd ) have been measured in three water column profiles in the North Western Mediterranean Sea. Clear enrichments of REE are observed when comparing to adjacent Atlantic waters suggesting REE inputs along the circulation in this area. For the first time, relative proportions of external sources including submarine groundwater discharges (SGD) have been quantified for the studied area. Atmospheric deposition is estimated to be the most important external source for all the REE with an average contribution of 44%, followed by diffusion from porewaters, which provide a 30%. Dissolved riverine fluxes account for 11%, SGD for 10% and dissolution of remobilized surface sediments the remaining 6%. Mass balances accounting for seawater transport and identified external sources have been delineated for the three main water masses (Modified Atlantic Waters, Levantine Intermediate Waters and Western Mediterranean Deep Waters). They show that the balances of REE in this area are Highlights Significance of dissolved REE transport and external inputs in the NW Mediterranean Sea Determination of REE fluxes associated with SGD and dissolution of reworked sediments Importance of reversible scavenging for REE in seawater

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Section: Sampling and Methodsmentioning

confidence: 99%

Balancing Rare Earth Element distributions in the Northwestern Mediterranean Sea

García-Solsona

Jeandel

2020

Chemical Geology

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“…It is essential for a coastal engineer to have mineralogical and morphologic studies before taking any decision before any beach nourishment, since any change in its typology or its characteristics may produce an unsuccessful nourishment, such as the examples shown in this research. The study of the mechanisms of weathering by accelerated laboratory tests [14,15] could be the solution to stablish the relationship between sediment wear and erosion of the shoreline in future beach nourishments designs.…”

Section: Discussionmentioning

confidence: 99%

Experiences with beach nourishments on the coast of Alicante, Spain

Pagán

López

Aragonés

et al. 2020

Proceedings E Report

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The historical evolution of sandy beaches on the coast of Alicante (Spain) has been analysed from aerial images from 1956 to 2019. The beach nourishments carried out in the 1990s to avoid coastal damages and to improve the touristic offer were studied. Shoreline evolution and beach surface has been obtained using GIS. The change of the sediment composition, from gravel to sand, due to the fills has caused a relevant imbalance. Beach nourishments failed its main aim of avoiding the shoreline erosion, causing environmental damages to the nearby Posidonia oceanica meadows.

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“…However, only a fraction (28 % on average) of the biogenic sediment produced inside the coastal ecosystems is delivered to the beach. The remaining fraction of sediment is transported outside the beach system, trapped inside the ecosystems (De Falco et al, 2000Serrano et al, 2012) or consumed by the process of carbonate grain alteration (López et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Biogenic sediments from coastal ecosystems to beach–dune systems: implications for the adaptation of mixed and carbonate beaches to future sea level rise

et al. 2017

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Abstract. Coastal ecosystems produce and store carbonate particles, which play a significant role in the carbonate dynamics of coastal areas and may contribute to the sediment budget of adjacent beaches. In the nearshore seabed of temperate zones (e.g. Mediterranean Sea and South Australia), marine biogenic carbonates are mainly produced inside seagrass meadows. This study quantifies the contribution of biogenic sediments, mainly produced in Posidonia oceanica seagrass meadows and secondarily in photophilic algal communities, to the sediment budget of a Mediterranean beachdune system (San Giovanni beach, western Sardinia, western Mediterranean Sea). A set of geophysical, petrographic and sedimentological data was used to estimate the sediment volume and composition of the beach-dune system as a whole. The San Giovanni beach-dune system contains 3 797 000 ± 404 000 t of sediment, 83 % (3 137 000 ± 404 000 t) of which is located in the coastal wedge, 16 % (619 000 ± 88 000 t) in the dune fields and 1 % (41 000 ± 15 000 t) in the subaerial beach. The sediments are composed of mixed modern bioclastic and relict bioclastic and non-bioclastic grains from various sources. The system receives a large input of modern bioclastic grains, mainly composed of rhodophytes, molluscs and bryozoans, which derive from sediment production of present-day carbonate factories, particularly P. oceanica seagrass meadows. Radiocarbon dating of modern bioclastic grains indicated that they were produced during the last 4.37 kyr. This value was used to estimate the longterm deposition rates of modern bioclastic sediments in the various beach compartments. The total deposition rate of modern bioclastic grains is 46 000±5000 t century −1 , mainly deposited in the coastal wedge (39 000 ± 4 000 t century −1 ) and dunes (7000 ± 1000 t century −1 ), and 46 000 t represents ∼ 1.2 % of the total beach-dune sediment mass. Carbonate production from coastal ecosystems was estimated to be 132 000/307 000 t century −1 , 28 % (15 % / 34 %) of which is transported to the beach-dune system, thus significantly contributing to the beach sediment budget.The contribution to the beach sediment budget represents a further ecosystem service, which our data can help quantify, provided by P. oceanica. The value of this sedimentsupply service is in addition to the other important ecological services provided by seagrass meadows. The dependence of the beach sediment budget on carbonate production associated with coastal ecosystems has several implications for the adaptation of mixed and carbonate beaches to the loss of seagrass meadows due to local impacts and the changes expected to occur over the next few decades in coastal ecosystems following sea level rise.

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The erosion on the east coast of Spain: Wear of particles, mineral composition, carbonates and Posidonia oceanica

Cited by 15 publications

References 25 publications

Balancing Rare Earth Element distributions in the Northwestern Mediterranean Sea

Balancing Rare Earth Element distributions in the Northwestern Mediterranean Sea

Experiences with beach nourishments on the coast of Alicante, Spain

Biogenic sediments from coastal ecosystems to beach–dune systems: implications for the adaptation of mixed and carbonate beaches to future sea level rise

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