Monitoring the volume and lateral spread of disposed sediments by acoustic methods, Oslo Harbor, Norway

Lepland, Aivo; Bøe, Reidulv; Lepland, Aivo; Totland, Oddbjørn

doi:10.1016/j.jenvman.2009.06.013

Cited by 20 publications

(10 citation statements)

References 20 publications

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“…toxicant release, sedimentation, light reduction), with direct impacts generally easier to predict. Over the past decade, management of dredging has improved significantly, largely through improved ability to predict the spatial extent and intensity of turbid plumes (Je et al, 2007;Lepland et al, 2009;Wu et al, 2007) but also through a greater understanding on the potential impacts on marine biota (Cooper et al, 2008;Cruz-Motta and Collins, 2004;Koslow et al, 2001;Simonini et al, 2005;Skilleter et al, 2006;Ware et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Recovery from the impact of light reduction on the seagrass Amphibolis griffithii, insights for dredging management

McMahon

Lavery

Mulligan³

2011

Marine Pollution Bulletin

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A large-scale, manipulative experiment was conducted to examine the extent and rate of recovery of meadows of the temperate Australian seagrass, Amphibolis griffithii to different light-reduction scenarios typical of dredging operations, and to identify potential indicators of recovery from light reduction stress. Shade cloth was used to mimic different intensities, durations and start times of light reduction, and then was removed to assess the recovery. The meadow could recover from 3 months of light stress (5-18% ambient) following 10 months re-exposure to ambient light, even when up to 72% of leaf biomass was lost, much faster recovery rates than has previously been observed for large seagrasses. However, when the meadow had been shaded for 6-9 months and more than 82% of leaf biomass was lost, no recovery was detected up to 23 months after the light stress had ceased, consistent with other studies. Five potential indicators of recovery were recommended.Recovery of seagrass from light reduction 2

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Section: Introductionmentioning

confidence: 99%

Recovery from the impact of light reduction on the seagrass Amphibolis griffithii, insights for dredging management

McMahon

Lavery

Mulligan³

2011

Marine Pollution Bulletin

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“…The compaction of the harder original seabed was likely to occur to a lesser extent. In the earlier study on the site (Lepland et al, 2009), the compaction of the natural seabed as a result of dredged sediment loading was estimated to be 6 percent of the thickness of the disposed sediments. An equivalent compaction of 2 cm below the cap layer (32 cm) was used to correct the compaction of natural sediments at the sea floor.…”

Section: Sea Floor Elevation Change and Backscattermentioning

confidence: 96%

Sand Cap Placement and Cap Thickness Monitoring: A Case Study at a Confined Disposal Facility

Vidgren

Helland

Lepland

2015

Remediation Journal

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Thin sediment capping is a commonly used technique to prevent mobilization of contaminants from sediments into the environment. A 70‐m‐deep subaqueous confined disposal facility (CDF, 350,000 m2) at Malmøykalven, Oslofjord, which received dredged contaminated sediments from Oslo Harbor, was capped with 148,900 m3 of sand in 2009. This research serves as a case study regarding some of the key considerations involved with the cap placement and monitoring of the cap layer. Uncertainty is included in all the cap thickness monitoring methods and a combined use of them provided a better understanding of the cap coverage and structure at the site. An open water disposal model (STFATE) was used to simulate the behavior of the barge‐released cap material. The modeling results were consistent with field observations regarding the material spread, and the results provided insight into the relatively high material losses calculated. Better knowledge obtained of material settling resulted in cap properties and cap monitoring methods that are useful when planning similar operations. ©2015 Wiley Periodicals, Inc.

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“…Norway performed bathymetric surveys covering the whole inner part of the Oslofjord [20]. Onboard the research vessel (R/V) Seisma, an interferometric sonar system (GeoSwath, Geo-Acoustics) with 125 and 250 kHz transducers was used to provide a three-column xyz-file with georeferenced depth values.…”

Section: Bathymetry In 2004 and 2005 The Geological Survey Ofmentioning

confidence: 99%

Identification of Fine-Scale Marine Benthic Ecoclines by Multiple Parallel Ordination

Son

Halvorsen

Norling

et al. 2014

Journal of Marine Biology

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The species-environment relationship is a fundamental structural property of natural ecosystems. Marine sedimentary macrofauna is known to be structured by a range of environmental variables; however, the mechanisms by which environmental variables covary to form complex-gradients (i.e., groups of intercorrelated environmental variables), and how these are related to coenoclines (i.e., gradients in species composition), remain poorly understood. We classified our study area into geomorphological features that were used for stratified sampling of macrofaunal polychaetes, molluscs, and echinoderms. The resulting species-by-site matrix was subjected to indirect gradient analysis by a multiple parallel ordination strategy, using detrended correspondence analysis and nonmetric multidimensional scaling. One major and one minor coenocline were identified. Based on the correlation between complex-gradients and the main coenocline we hypothesise the existence of two ecoclines that we have termed Periodic hypoxia and Periodic physical forcing. We conclude that a combination of recurrent (periodical) and extreme events is likely to determine the variation found in the species composition of marine sedimentary ecosystems. Based on the results of our study, we conclude that indirect gradient analysis is a useful tool for enhancement of our basic mechanistic understanding of the processes governing the compositional structure of marine sediment communities.

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Monitoring the volume and lateral spread of disposed sediments by acoustic methods, Oslo Harbor, Norway

Cited by 20 publications

References 20 publications

Recovery from the impact of light reduction on the seagrass Amphibolis griffithii, insights for dredging management

Recovery from the impact of light reduction on the seagrass Amphibolis griffithii, insights for dredging management

Sand Cap Placement and Cap Thickness Monitoring: A Case Study at a Confined Disposal Facility

Identification of Fine-Scale Marine Benthic Ecoclines by Multiple Parallel Ordination

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