Turbidity and Other Effects Resulting from Trafalgar Sandbank Dredging and Palmar Beach Nourishment

Román-Sierra, Jorge; Navarro, Marina; Muñoz-Pérez, Juan J.; Gómez-Pina, Gregorio

doi:10.1061/(asce)ww.1943-5460.0000098

Cited by 27 publications

(16 citation statements)

References 29 publications

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“…Thus, the existence of a fine sediment plume observed during the nourishment procedure was probably due to carbonate dissolution [22]. This point is interesting, because the fine-sediment percentage was also negligible at the samples taken from Trafalgar (the borrow site used for VB), but nevertheless, there was always dredging-induced turbidity which decreased with time, reaching natural conditions approximately 9 min after the operations ceased [47]. Since Trafalgar sand is siliceous (and therefore the possibility of calcareous solution must be discarded), we should consider the plausibility of losses of the fine-sediment fraction when a Van Veen grab is used to sample the sediment, instead of another procedure which guarantees good fine material retention and undisturbed samples.…”

Section: Fine Sedimentsmentioning

confidence: 88%

A Comparison of Beach Nourishment Methodology and Performance at Two Fringing Reef Beaches in Waikiki (Hawaii, USA) and Cadiz (SW Spain)

Muñoz-Pérez

Gallop

Moreno

2020

JMSE

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Fringing reefs have significant impacts on beach dynamics, yet there is little research on how they should be considered in beach nourishment design, monitoring, and conservation works. Thus, the behavior and characteristics of nourishment projects at two reef protected beaches, Royal Hawaiian Beach (RHB) in Hawaii, USA, and Victoria Beach (VB) in Cadiz, Spain, are compared to provide transferable information for future nourishment projects and monitoring in fringing reef environments. The nourishment cost at RHB was nine times higher than VB. This is partly due to lower total volume and a more complex placement and spreading method at RHB, despite the much closer borrow site at RHB. There was a significant difference in post-nourishment monitoring frequency and assessment of accuracy. RHB elevation was monitored quarterly for 2.7 years at 30 m-spaced profiles, compared to 5 years of biannual surveys of 50 m-spacing at VB. An additional problem related to the presence of reefs at both RHB and VB was estimating the beach volume increase after nourishment, due to variable definitions of the 'beach' area and high alongshore variability in reef topography. At sites where non-native sediment is used, it is imperative to understand how wave and current energy changes due to reefs will influence nourishment longevity. Thus, differences in erosion and accretion mechanisms at both beaches have been detected, though are still little understood. Moreover, discrepancies in sediment porosity between the two sites (which should be surveyed in future nourishments) have been found, probably due to differences in the nourishment sand transportation and distribution methods. In summary, more dialogue is needed to explicitly consider the influence of fringing reefs on coastal processes and beach nourishment projects. time [2,3]. However, there is increasing research showing that the geologic setting plays a dominant role in contemporary beach morphodynamics [4][5][6][7]. In fact, some studies have taken into account the former geologic setting to design multifunctional artificial reefs that serve several purposes [8].One common type of geologically-controlled beach is situated landward of areas of hard bottom, such as rock or coral reefs. Reefs have large impacts on coastal hydrodynamics, sediment transport, and morphology, such as by influencing water level fluctuations [9], wave set-up and cross-reef currents [10], wave breaking, wave-induced flows, and wave attenuation over reef platforms [11][12][13][14][15], which affect the beach morphodynamics tidal range at multiple scales [16][17][18][19], even under hurricane conditions [20,21].Despite clear evidence that beaches with reefs behave differently to their non-reef counterparts, there has been scant attention given to how reefs should be considered in beach nourishment projects. A recent study by Habel et al. [22] focused on the methodology of a beach nourishment at Royal Hawaiian Beach (RHB), Waikiki, which is fronted by a fringing coral reef. They also analyzed the subseque...

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Section: Fine Sedimentsmentioning

confidence: 88%

A Comparison of Beach Nourishment Methodology and Performance at Two Fringing Reef Beaches in Waikiki (Hawaii, USA) and Cadiz (SW Spain)

Muñoz-Pérez

Gallop

Moreno

2020

JMSE

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“…Dredging occurs frequently in many lakes, rivers, harbors, or coastal areas to maintain adequate water depths for navigation, provide sand and gravel for construction and reclamation projects, or remove contaminated sediments to improve water quality and restore the health of aquatic ecosystems (Nayar et al 2004, Robinson et al 2005, Fraser et al 2006, Smith et al 2006, Spencer et al 2006, Roman-Sierra et al 2011, Lurling and Faassen 2012. However, long-term and intensive dredging can also create disturbances to aquatic ecosystems with adverse impacts.…”

Section: Dredging and Management Recommendationsmentioning

confidence: 99%

Using remotely sensed suspended sediment concentration variation to improve management of Poyang Lake, China

Qiu

Fei

Liu

et al. 2013

Lake and Reservoir Management

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Cui L, Qiu Y, Fei T, Liu Y, Wu G. 2013. Using remotely sensed suspended sediment concentration variation to improve management of Poyang Lake, China. Lake Reserv Manage. 29:47-60.This study applied Moderate-Resolution Imaging Spectroradiometer (MODIS) images from 2000 to 2010 to obtain and analyze the spatiotemporal variation of suspended sediment concentration (SSC) and discussed factors affecting it in Poyang Lake, China. Results showed that (1) the mean SSC was lower in the south, higher in the north, and moderate in the central lake region; (2) the mean SSC in the south was lower than or close to 20 mg/L, with no clear annual trend; (3) the mean SSC in the north was slightly higher than 20 mg/L in 2000 and increased from 2001, with the highest value >60 mg/L in 2006; (4) the mean SSC in the central lake region, except for 2009, ranged from 20 to 40 mg/L and had an annual pattern similar to that in the southern lake region; (5) for the entire lake, the mean SSC declined from January to March, increased from September to December, and fluctuated from April to August; and (6) several higher SSC values were found in the central or southern lake regions. The spatiotemporal variation of SSC was controlled by natural and human factors, in which dredging was dominant. Limiting the area of dredging and reducing dredging intensity would decrease SSC and maintain sustainable development of Poyang Lake. Remote sensing can obtain the spatiotemporal information of some water quality parameters, which will help managers understand the lake dynamics and mechanisms to make better decisions for lake management.

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“…Grain size is a fundamental and descriptive property of siliciclastic sedimentary rocks (Bernabeu et al, 2002;Benavente et al, 2005;Baquerizo and Losada, 2008) and it is used for classifying sedimentary facies and environments (Folk, 1954;Flemming, 2000;Anfuso and Gracia, 2005;Román-Sierra et al, 2011). In a particular environment it reflects the weathering and erosion processes and nature of transport.…”

Section: Introductionmentioning

confidence: 99%

Depositional Environment in Great Indian Desert using Grain Size Parameters and its Chemical Characterization

Singh

Kumar²,

Kumar

et al. 2015

Journal of the Geological Society of India

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Grain size is a fundamental descriptive measure of sediment and sedimentary rock. A large part of information related to sedimentary particles transport and deposition can be obtained from grain size. Grain size parameters are useful for recognizing sedimentary environments such as dune, river, beach marine and others of continental shelf through graphical, moment and statistical methods. Bivariate plots between various statistical grain size parameters can be successfully used for distinction of such environments. The present study aims at grain size analysis of fifty sediment samples collected from Thar desert of India. The statistical grain size parameters were treated using different statistical tools such as factor and discriminatory analysis to decipher the depositional history of the sediments of the study region. The analysis suggests that the sediments mainly deposited in fluvial to beach environment along with aeolian deposition. The shape and composition of the sediments grains were also studied using energy dispersive X-ray spectroscopyscanning electron microscope (EDX-SEM) which suggested the dominance of fluvial environment in the deposition.

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Turbidity and Other Effects Resulting from Trafalgar Sandbank Dredging and Palmar Beach Nourishment

Cited by 27 publications

References 29 publications

A Comparison of Beach Nourishment Methodology and Performance at Two Fringing Reef Beaches in Waikiki (Hawaii, USA) and Cadiz (SW Spain)

A Comparison of Beach Nourishment Methodology and Performance at Two Fringing Reef Beaches in Waikiki (Hawaii, USA) and Cadiz (SW Spain)

Using remotely sensed suspended sediment concentration variation to improve management of Poyang Lake, China

Depositional Environment in Great Indian Desert using Grain Size Parameters and its Chemical Characterization

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