continuous sedimentation Articles
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Continuous simulation of suspended sediment through a stream section
This paper presents the development of a one–dimensional stream water quality model for the continuous simulation of suspended sediment transport and deposition processes along a particular stream section. The model integrates stream hydraulics and suspended sediment transport and deposition processes. The stream hydraulic model was developed using the Muskingum–Cunge method of channel routing. ...
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A study on the estimating of sediment concentration with turbidity and acoustic backscatter signal for different sediment sizes
Turbidity and acoustic measurement are alternative indirect methods to determine sediment concentration. Acoustic Doppler velocimetry can be used to estimate suspended sediment concentration (SSC) with the signal-to-noise ratio (SNR) in the water. In this study, particles size affecting turbidity and SNR values was investigated using four different sediment size groups (0–50, 50–100, 100–200, ...
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Light attenuation – a more effective basis for the management of fine suspended sediment than mass concentration?
Fine sediment continues to be a major diffuse pollution concern with its multiple effects on aquatic ecosystems. Mass concentrations (and loads) of fine sediment are usually measured and modelled, apparently with the assumption that environmental effects of sediment are predictable from mass concentrations. However, some severe impacts of fine sediment may not correlate well with mass ...
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Sedimentation Processes
Sedimentation is the process of allowing particles in suspension in water to settle out of the suspension under the effect of gravity. The particles that settle out from the suspension become sediment, and in water treatment is known as sludge. When a thick layer of sediment continues to settle, this is known as consolidation. When consolidation of sediment, or sludge, is assisted by mechanical ...
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Accumulation of polychlorinated biphenyls from contaminated sediment by Atlantic cod (Gadus morhua): Direct accumulation from resuspended sediment and dietary accumulation via the polychaete Nereis virens
Bioaccumulation of sediment‐associated polychlorinated biphenyls (PCBs) was examined in Atlantic cod (Gadus morhua) through direct diffusion from the sediment (via the water phase) and through the food chain (dietary exposure). To facilitate direct accumulation from the sediment, the sediment was continuously resuspended. To study the dietary bioaccumulation of PCBs, cod were fed benthic ...
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Evolution of water-in-oil emulsion controlled by droplet-bulk ion exchange: acoustic, electroacoustic, conductivity and image analysis
Water-in-kerosene emulsion stabilized with SPAN surfactant exhibits a slow transition (on scale of hours) from an emulsion to a mini-emulsion state. We continuously monitor this transition in the relatively concentrated samples (5 vol.% water), without dilution, using acoustic, electroacoustic and conductivity measurements. Continuous stirring prevents sedimentation. We confirm our measurements ...
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Monitoring accumulation sediment characteristics in full scale sewer physical model with urban wastewater
A series of experiments were carried out with real wastewater in a pilot flume located at A Coruña wastewater treatment plant (WWTP) (Spain). A full scale model was developed to test a circular (300 mm inner diameter) and an equivalent area egg-shaped plastic pipe under controlled experimental conditions (pipe slope 2–5‰, averaged discharge Q = 4 L/s). Velocity profiles and sediment ...
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Characterizing long-term Hydrologic-response and sediment-transport for the R-5 catchment
Recently there have been several calls to establish long-term data collection networks to monitor near-surface hydrologic response and landscape evolution. The focus of this paper is a long-term dataset from the International Hydrologic Decade (1965–1974). The small upland catchment, known as R-5, located near Chickasha, Olahoma, has been the subject of considerable attention within the ...
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Geotube Dewatering Technology Unclogs Queen’s Creek and the Queens Lake Marina Waterways - Case Study
Dredging contractor uses cost effective and innovative dewatenng technology to contain and dewater marine sediments. A build-up of organics, sediments, very fine silt and clay created a major navigational problem for members of the Queens Lake Marina Association, in York County, VA. A contract was issued to dredge and dewater sediments in the boat slips and outside the enclosed slip area. Site ...
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Dynamic stormwater treatment unit model for micropollutants (STUMP) based on substance inherent properties
Modelling the removal of micropollutants (MPs) in stormwater treatment systems is essential in a context that is characterized by a general lack of measurements. This paper presents an innovative dynamic model for the prediction of the removal of MPs in stormwater treatment systems (Stormwater Treatment Unit model for Micro Pollutants—STUMP). The model, based on a conceptual model of ...
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Source Catchments
Better Future for Catchment Managers Applying a whole-of-catchment approach to water management is now possible thanks to Source Catchments, the first component of eWater’s integrated water modelling suite, eWater Source to be publicly released. A water quality and quantity model, Source Catchments is designed to help natural resource managers and consultants develop targets, ...
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How do you clean a stormwater management pond?
How do you clean a stormwater management pond (SMWP) without draining the pond first? A clean-out of the SWMP is required once every 5-15 years to remove accumulated sediments to ensure the pond continues to function as intended. Drainage of the SWMP is not always required to facilitate the clean-out. By combining the pumping and excavation into one process! New pumping technology - Dragflow ...
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Filtering and retention structures
Filtering and retention structures serve the purification and intermediate storage of rainwater discharge from tilled areas. The untreated rainwater from a seperate sewer system can have a major share in water body pollution. Thereby, especially the concentration of filtratable material is problematic. Additionally, rainwater floats intermittently into the water body. Measures for purification ...
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Diffuse phosphorus models in the united states and europe: their usages, scales, and uncertainties
Received for publication February 3, 2008. Today there are many well-established computer models that are being used at different spatial and temporal scales to describe water, sediment, and P transport from diffuse sources. In this review, we describe how diffuse P models are commonly being used in the United States and Europe, the challenge presented by different temporal and spatial scales, ...
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Historical decline and altered congener patterns of polychlorinated dibenzo‐p‐dioxins and dibenzofurans in fish and sediment in response to process changes at a pulp mill discharging into Jackfish Bay, Lake Superior
Improved regulations for pulp and paper mill effluents and an industry shift away from elemental chlorine bleaching in the 1990s greatly reduced the release of polychlorinated dibenzo‐p‐dioxins and dibenzofurans (PCDD/Fs) into the environment. However, the high potential of these contaminants to persist in sediment and bioaccumulate in biota means that they have remained a concern. To document ...
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Skid mounted BWRO Systems, Venezuela
INTRODUCTION In July 2013, Pure Aqua successfully manufactured and supplied five skid mounted BWRO systems to a major company in Venezuela. The skid mounted BWRO systems came complete with am activated carbon filter for chlorine removal and a water softener to remove hardness. It came pre-piped and wired all on one skid controlled by one microprocessor control panel. The system was designed to ...
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Water Use and Reuse in Petroleum Refining
Refineries can be like cities, and opportunities for water reuse abound, from recycling of process water to sewage Although the water requirements of oil exploration make water reuse a hot topic for the upstream petroleum industry — the exploration and production end — there are significant opportunities for reuse downstream, which includes refining. Petroleum refineries are ...
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1 Journey to Improve Water Quality in Powers Lake
Abstract Outbreaks of blue-green algae in Powers Lake, a 1,616-acre natural lake, created an emergent call to action in the 1990's from the community of Powers Lake, North Dakota, USA. Ongoing community action and funding both federal and local continue to improve water quality in Powers Lake. The Powers Lake Watershed Committee received three 319 federal grants and matched federal funding with ...
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Area-Velocity Flowmeter Installations in Denmark - Case Study
Area-Velocity Flow Meters are designed to monitor flow rates in partially filled pipes and open channels without flumes or weirs. A sealed ultrasonic sensor is mounted on the bottom of the pipe or channel and connected to electronics through a watertight cable. The sensor measures both level and velocity and when calibrated with the pipe diameter or channel dimensions, the Greyline AVFM ...
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TURBIDITY BARRIER ULTIMATE GUIDE
TURBIDITY BARRIER ULTIMATE GUIDE Definition Floating turbidity barriers (a.k.a. silt curtains, silt boom, sediment curtain) are a temporary in-water sediment barrier consisting of a continuous geotextile fabric curtain suspended from a flotation device on the water surface and held in a vertical position by ballast weight at the bottom. Purpose To provide erosion and ...
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