Portable Meter System for Dry Weight Control in Dredging Hoppers

Muñoz-Pérez, Juan J.; Mas, José Manuel Gutiérrez; Moreno, J.; Español, L.; Moreno, Luís; Bernabéu, Ana M.

doi:10.1061/(asce)0733-950x(2003)129:2(79)

Cited by 5 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, we can see how the grain size of the native sand was less than that of the borrowed sand at SMM. The largest D50 values within the nourished sand were found in the upper area of the beach, given that sand was dumped almost entirely in the upper area of the beach due to the pumping system, to reach a settling of the sand [43] as shown in Figure 7. The pipe is brought to the beach and placed within an artificial ridge.…”

Section: Total Variation In MM and Dif% Of D50 In Each Zonementioning

confidence: 99%

Evolution of Sediment Parameters after a Beach Nourishment

Pérez

Vendoiro

Garcia

et al. 2021

Land

Self Cite

View full text Add to dashboard Cite

A methodology for monitoring the behaviour and size of sand after a beach nourishment process is presented herein. Four sampling campaigns (before and just after the nourishment, after six months and one year later) were performed on four beaches of the Gulf of Cadiz (Spain). D50 and sorting size parameters were analysed. Among the results, it should be noted that differences of up to 20% between native and nourished sand values disappear only one year after the nourishment.

show abstract

Section: Total Variation In MM and Dif% Of D50 In Each Zonementioning

confidence: 99%

Evolution of Sediment Parameters after a Beach Nourishment

Pérez

Vendoiro

Garcia

et al. 2021

Land

Self Cite

View full text Add to dashboard Cite

show abstract

“…Concerns about the accuracy of the volumes measured aboard the ship are common. Readers interested in a detailed description of the methodology, and about an independent and portable meter system for dry weight control in hopper dredgers in order to distinguish between the dry sand weight and the sea water weight can consult [30].…”

Section: Determination Of Nourishment Volumementioning

confidence: 99%

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

Self Cite

View full text Add to dashboard Cite

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...

show abstract

“…These alternatives are sand redistribution on the beach, the use of sand quarries, and the dredging of marine harbors, river mouths, and other marine sandbanks increasingly distant from the coastline. Today, this is possible because current dredges have a greater capacity for dredging at high depths, up to 100 m (Muñoz-Perez et al 2003). In this context, dredging and material disposal could be defined as an artificially induced process of erosion, transport, and deposition of sediments.…”

Section: Introductionmentioning

confidence: 99%

“…According to Muñoz-Perez et al (2003), a need for the regeneration of beaches in general exists in Spain because of the erosion experienced by most of the coast, which is attributed to the rise in sea level, the retention of sand in dams, occupation of dry beaches by urbanized areas, the removal of sand as a material for building construction, and so on. Unfortunately, the lack of sandbanks off the southwestern Spanish coast has been an ongoing problem for beach nourishment, even with the existence of dunes with an excess sand supply (Muñoz-Perez et al 2009), because of the unprofitable sand-transport costs.…”

Section: Introductionmentioning

confidence: 99%

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

Román-Sierra

Navarro

Muñoz-Pérez

et al. 2011

J. Waterway, Port, Coastal, Ocean Eng.

View full text Add to dashboard Cite

Beach-nourishment requirements on the southwestern Spanish coast have led to a significant increase in offshore dredging. Following a new research line, assessment of changes recorded in physicochemical and biological parameters due to dredging and dumping operations was performed at the Cape of Trafalgar and Palmar Beach during June and July 2008. Turbidity, salinity, pH, dissolved oxygen, temperature, and suspended-sediment data were collected at 10 stations. At the end of the study, a three-campaign monitoring program was implemented for 1 year to assess the possible effects on biological communities and sediment properties. The relevant results, such as the average extent of the sediment plume (< 400 m) and its persistence in the environment (< 10 min), are discussed in this paper. A precise correlation between turbidity and suspended sediments and the recovery time of ecological balance were also established. Furthermore, minimal and reversible effects caused by dredging and dumping operations in this type of marine environment were identified.

show abstract

Portable Meter System for Dry Weight Control in Dredging Hoppers

Cited by 5 publications

References 3 publications

Evolution of Sediment Parameters after a Beach Nourishment

Evolution of Sediment Parameters after a Beach Nourishment

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

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

Contact Info

Product

Resources

About