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Showing 1 to 18 of 18 for “"sediment sampling"”.
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Design and Testing of a Hadal Sediment Sampling System
Sediment cores are conventionally gathered to collect data on seabed chemical and mineral composition. These samples are important in determining the health of the surrounding environment and, if sediment layers are preserved, assessing the environmental history and trajectory of our ocean floors. …
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River Sediment Sampling and Environment Quality Standards: A Case Study of the Ravensbourne River
Sediment is a major sink for heavy metals in river, and poses significant risks not only to river quality but also to aquatic and benthic organisms. At present in the UK, there are no mandatory sediment quality standards. This is partly due to insufficient toxicity data but also due to problems …
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Development of a Sediment Sampling Free Fall Penetrometer Add-on Unit for Geotechnical Characterization of Seabed Surface Layers
In-situ geotechnical testing of surficial sediment layers in areas of active sediment dynamics can provide essential information about physical and geotechnical variations of sediment properties with regards to active sediment remobilization processes. For example, portable free fall penetrometers …
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Advanced Suspended Sediment Sampling and Simulation of Sediment Pulses to Better Predict Fluvial Geomorphic Change in River Networks
Sediment, an integral part of rivers and watersheds, is eroded from, stored in, and transported through various watershed components. Rivers often receive sediment in the form of episodic, discrete pulses from a variety of natural and anthropogenic processes, this sediment can be transported …
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Particle Size Distribution Analysis of a Mining-Impacted Gravel-Bed Stream in Ohio Using a Hybrid Sediment Sampling Technique
… researcher collected pavement and subpavement sediment samples at 17 sites using the hybrid areal sampling technique with a clay adhesive. The watershed, which is heavily impacted by mining and agricultural activities, suffers from low pH, high concentrations of metals and sediment in the water …
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Sediment circulation in mixed gravel and shingle bayhead beaches on the South East Dorset coast.
… the morphological characteristics, processes and sedimentology of five local mixed gravel and shingle beaches. A conceptual framework of process response has been adopted which considers energy inputs, sediment transport and coastal morphology, under conditions of limited sediment supply and a …
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Development of a Pre-Impact Environmental Site Characterization for the Bryan Mound, Texas Strategic Petroleum Reserve
… baseline data for biological conditions, and sediment sampling for total petroleum hydrocarbons serves as a chemical component of the model. Results demonstrate previously unknown conditions that would hinder remediation and affect the persistence of petroleum contaminants. Results also …
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Caratterizzazione morfodinamica della spiaggia del Poetto
… the beach space. Wave data, beach profiling, sediment sampling and analyses, low-cost video monitoring techniques and numerical modelling were used to investigate the beach dynamics. A multidisciplinary methodology coupling wave data, sediment sampling and analyses, beach profiling, video …
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Sediment deposition in the lower Hudson River estuary
This study uses geophysical and sedimentological data collected from the Lower Hudson River estuary to identify the depositional response of the estuary to high river discharge events. Erosional and depositional environments in the estuary are identified through the use of side-scan sonar, bottom …
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MERCURY DISTRIBUTION IN SOILS AND STREAM SEDIMENTS OF CENTRAL INDIANA, USA
… of mercury (Hg) in soils and stream sediments was conducted to understand the impact of urbanization on Hg deposition and accumulation on the upper west fork of the White River watershed in central Indiana. Samples were collected to the north and east (i.e., downwind) of emission …
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Sediment redistribution in the Uilkraals estuary as a consequence of human disturbance
… has often resulted in the redistribution of sediments, which ultimately leads to detrimental impacts in these environments. The aim of this study is to investigate how the sediment distribution and dynamics within a specific estuary, the Uilkraals estuary, have been affected by human …
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Sampling spatial sediment variation in gravel-bed streams
… important role in determining a river's depth, sediment transport rates, and stream bed stability as well as the survival rates of mussels and salmonids. Unfortunately, the material found in gravel-bed rivers exhibits vertical stratification as well as spatial variation in the horizontal …
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Assessment of sediment and water quality in Sembrong Reservoir, Johor
… Pahat. Depletion of storage capacity due to the sedimentation process and eutrophication has recently been the most concerning issues at the reservoir. The objectives of this research are to analyze the distribution of sediment and sedimentation rate in Sembrong reservoir by using GIS. Also, to …
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Dredge spoil dispersion from an inner shelf dump-mound
… by underwater-video and SCUBA diving, and remote sediment sampling. It showed the existence of a natural coarse sand facies with wave-generated megaripples (coarse-grained ripples) which is overlain by a lightly rippled to flat fine sand facies. Repeated surveys indicate that the bedforms react to …
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Andean sediment response to natural and anthropogenic changes at the catchment scale
… erosion is contributing to increased levels of sediment in river systems threatening crucial river functions, including crop irrigation, drinking water, and hydroelectricity. Past studies in the Andes regarding soil erosion have indicated that human activities have accelerated soil erosion and …
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The Accuracy of River Bed Sediment Samples
… and ecological health is the streambed's sediment size distribution. This distribution affects streambed stability, sediment transport rates, and flood levels by defining the roughness of the stream channel. Adverse effects on water quality and wildlife can be expected when excessive fine …
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Exploring fine sediment dynamics and the uncertainties associated with sediment fingerprinting in the Nene river basin, UK
… and ecological status of freshwater bodies. Fine sediment has been shown to be a major cause of the degradation of lakes and rivers, and as a result research in geomorphology has been directed towards the understanding of fine sediment dynamics. It was identified by a review of published …
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The phosphorus transfer continuum under climate change
… diffuse sources dominate. I use bi-weekly sampling of P, chloride (Cl- ) and flow (Q), load apportionment modelling (LAM) and mass balance, alongside sediment sampling to investigate retention at the headwater scale. I found that although diffuse sources contributed to more of the TP load, …