The impacts of Segura River (Spain) channelization on the coastal seabed

Aragonés, Luís; Pagán, José Ignacio; López, M.; García-Barba, Javier

doi:10.1016/j.scitotenv.2015.11.058

Cited by 37 publications

(35 citation statements)

References 28 publications

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“…Thus, by using a GIS, layers were generated from the Figure 3 shows the median sediment size distribution in 1987 and 2006. As can be seen, in 2006 there is a reduction of the fine sediments, which probably have been dragged to the abyssal plains by the waves as was proposed by Aragonés et al [14]. Although it is still observed a certain accumulation in areas close to river mouths, perhaps due to their contribution.…”

Section: Study Areamentioning

confidence: 67%

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Relative position of the size of sediments in the cross-shore profile

López¹,

Aragonés²,

López³

et al. 2017

Int. J. SDP

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Most of the beaches in the world have serious erosion problems. To solve this problem, there are different methods of beach nourishment, which consist mainly of a feedback from the beach by pouring sand and with some protection element as dikes or breakwaters. The problem arises when selecting the optimal size of sediment for nourishment. The literature suggests that sediments with similar or higher sizes than those on the dry beach should be employed for nourishment. However, this does not ensure the stability of the future profile since, it is not known how the new material will be distributed on the seabed. In this work, the evolution of the sediment size of the seabed and its position relative to the coastline is studied, using sedimentological data of 1987 and 2006 in the southern part of the province of Valencia (Spain) using a GIS system. Thus, it was observed that: i) the sediment sizes smaller than 0.063 mm are placed beyond the depth of closure (DoC), ii) sizes 0.180-0.125 sediment are located between the shoreline and the DoC, iii) while the sizes of 0.250 are located mainly near the coastline. Therefore, when performing beach nourishment on this area, a material between 0.250 and 0.180 mm should be used, which will ensure the stability of the profile and the sand will not cross the DoC, which would mean the loss permanently.

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Section: Study Areamentioning

confidence: 67%

“…For this, the methodology described by Aragonés et al [14] was followed. Thus, by using a GIS, layers were generated from the Figure 3 shows the median sediment size distribution in 1987 and 2006.…”

Section: Study Areamentioning

confidence: 99%

Relative position of the size of sediments in the cross-shore profile

López¹,

Aragonés²,

López³

et al. 2017

Int. J. SDP

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“…Moreover, in these areas there is a constant exchange of sediments with the sea. These natural interactions can be altered by human action, modifying coastal dynamics, causing alterations in beaches and dunes, and affecting their stability [1].…”

Section: Introductionmentioning

confidence: 99%

3d Modelling of Dune Ecosystems Using Photogrammetry From Remotely Piloted Air Systems Surveys

Pagán

López

Bañón

et al. 2019

Computational Methods and Experimental Measurements XIX

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Dune ecosystems play a key role in coastal dynamics, where a constant exchange of sediments between the sand dune and the beach exists. Thus, it is essential to measure with high precision its movements and monitor its evolution. Classical topographical surveys-even those based on real-time kinematic GPS surveys-are suitable for obtaining profiles with high accuracy, but their cost, in terms of time and personnel, make them inappropriate for large areas. Moreover, these techniques do not precisely measure volumetric changes in high-variable environments such as sand dunes. LiDAR is an active remote sensing method that reflects laser pulses off the land and records topographic positions, but LiDAR scanners are still an expensive and evolving technology. The use of Remotely Piloted Air Systems (RPAS) aims to solve this problem. RPAS map sand dunes using photogrammetric methods, such as Structure-from-Motion (SfM), to produce three-dimensional models from two-dimensional images. This methodology has the advantage of needing only a digital camera and is, therefore, cost effective. The objective of this study is to demonstrate the use of RPAS to map and model the sand dunes of Guardamar del Segura (Spain). The survey covered an extension of 226,000 m 2. The results allow us to obtain a point cloud with a density of 30 points per sq m. A 3D digital elevation model of the dune has been created from the dense point cloud, with a vertical accuracy of 0.2 m Root Mean Square Error. An orthophoto was also created with a spatial resolution of 5 cm. The main conclusion is that the use of RPAS and SfM is an adequate technique to periodically monitor dune ecosystems with high accuracy and cost savings.

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“…In this way, wave farms can be used not only for renewable energy production but also for coastal protection purposes in beaches subject to erosion (Abanades et al, 2018(Abanades et al, , 2014a. Among them, deltaic coasts have been particularly affected in recent centuries due to human interventions in the basins (Anthony et al, 2014;Aragonés et al, 2016;Bergillos et al, 2018;Brown and Nicholls, 2015;Syvitski et al, 2009) and are especially vulnerable to the effects of global warming (Payo et al, 2016;Sánchez-Arcilla et al, 2016;Spencer et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Wave farm effects on the coast: The alongshore position

Rodríguez-Delgado

Bergillos

Ortega-Sánchez

et al. 2018

Science of The Total Environment

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For wave energy to become a fully-fledged renewable and thus contribute to the much-needed decarbonisation of the energy mix, the effects of wave farms (arrays of wave energy converters) on coastal systems must be addressed. The objective of this work is to investigate the effects of wave farms on the longshore sediment transport and shoreline evolution of a gravel-dominated beach and, in particular, its sensitivity to the longshore position of the farm based on eight scenarios. Nearshore wave propagation patterns are computed by means of a spectral wave propagation model (SWAN), variations in sediment transport rates induced by the farm are calculated, and a one-line model is applied to determine the shoreline position and dry beach area. The significant wave height at breaking is reduced in the lee of the wave farm, dampening sediment transport. We find that changes in the dry beach area induced by the wave farm are highly sensitive to its alongshore position, and may result in: (i) erosion relative to the baseline scenario (without wave farm) in three of the eight scenarios, (ii) accretion in three other scenarios, and (iii) negligible effects in the remaining two. These results prove that the alongshore position of the wave farm controls the response of the beach to the extent that it may shift from accretionary to erosionary, and provide evidence of its effectiveness in countering erosion if appropriately positioned. This effectiveness opens up the possibility of using wave farms not only to generate carbon-free energy but also to manage coastal erosion, thus strengthening the case for the development of wave energy.

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The impacts of Segura River (Spain) channelization on the coastal seabed

Cited by 37 publications

References 28 publications

Relative position of the size of sediments in the cross-shore profile

Relative position of the size of sediments in the cross-shore profile

3d Modelling of Dune Ecosystems Using Photogrammetry From Remotely Piloted Air Systems Surveys

Wave farm effects on the coast: The alongshore position

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