sediment dynamics Articles

  • Sedimentation dynamics in combined sewer systems

    Sediments in combined sewers may negatively affect the performance of sewer systems and significantly promote the formation of hydrogen sulfide. To prevent this, German sewer systems are cleaned regularly but at high costs. In order to optimize the cleaning intervals, this study investigates how deposits build up and change over a defined period under constant conditions. The experiments were ...


    By IWA Publishing

  • Experimental assessment of Athabasca River cohesive sediment deposition dynamics

    Polycyclic aromatic hydrocarbons (PAHs) originating from natural sources, and potentially from the Athabasca Oil Sands development, are of concern for the Athabasca River and Lake Athabasca delta ecosystems. In order to model the transport of fine sediments (and associated PAHs), it is important to describe the sediment dynamics within the river system. Flocs possess different settling ...


    By IWA Publishing

  • Dynamics of nitrate & perchlorate in groundwater.

    The Apache Powder Superfund Site is located in Cochise County, Arizona, approximately 50 miles southeast of Tucson. The site was listed on the National Priorities List pursuant to CERCLA in 1990. Principal groundwater chemicals of concern (COCs) include nitrate-nitrogen (nitrate-N) and perchlorate. Concentrations of nitrate-N exceeding 500 mg/l and 2,300 mg/l have been detected in the “shallow ...


    By Hargis + Associates Inc

  • Assessment of erosion and sedimentation dynamic in a combined sewer network using online turbidity monitoring

    Eroded sewer sediments are a significant source of organic matter discharge by combined sewer overflows. Many authors have studied the erosion and sedimentation processes at the scale of a section of sewer pipe and over short time periods. The objective of this study was to assess these processes at the scale of an entire sewer network and over 1 month, to understand whether phenomena observed ...


    By IWA Publishing

  • Using remote sensing to enhance modelling of fine sediment dynamics in the Dutch coastal zone

    Modelling fine sediment dynamics, including transport, deposition and re-suspension, is very complex. This led to studies that validate the modelled suspended particulate matter (SPM) based on in-situ measurements. While in-situ measurements are often sparse in time and space, satellite measurements provide us with higher spatial and temporal resolution. This information can be used to validate ...


    By IWA Publishing

  • Impact of sedimentation on wetland carbon sequestration in an agricultural watershed

    Received for publication January 9, 2008. Landscape redistribution of soil C is common within agricultural ecosystems. Little is known about the effects of upland sediment deposition on C dynamics within riparian wetlands. To assess sedimentation impact, we obtained profile samples of wetland soil and used the combination of 137Cs, 210Pb, and 14C chronological markers to determine rates of C ...

  • Modelling of sediment nutrient fluxes for a pulsed organic load

    A sediment model has been developed to simulate the Sediment Oxygen Demand (SOD) and sediment nutrient fluxes after a sudden input of Particulate Organic Matter (POM). Compared with previous sediment models, the main advances are the use of a continuous function to represent the kinetics of POM diagenesis and inclusion of the biomass content in POM diagenesis. Laboratory experiments were also ...


    By Inderscience Publishers

  • Effects of longitudinal baffles on particles settling in a sedimentation basin

    This study was conducted to evaluate the effects of longitudinal baffles on particles settling performance within a full-scale sedimentation basin with a flow rate of 1,000 m3/hr. Comparative experiments on turbidity removal efficiency and sludge deposit distribution were performed in longitudinally baffled and non-baffled sedimentation basins. The turbidity removal rate in the baffled ...


    By IWA Publishing

  • Surface water Sulfate dynamics in the northern Florida everglades

    Received for publication August 24, 2007. Sulfate contamination has been identified as a serious environmental issue in the Everglades ecosystem. However, it has received less attention compared to P enrichment. Sulfate enters the Arthur R. Marshall Loxahatchee National Wildlife Refuge (Refuge), a remnant of the historic Everglades, in pumped stormwater discharges with a mean concentration of ...

  • Ten Good Reasons To Build Dynamic Models

    Over the last ten years computer technology and network modelling software have developed beyond all recognition, providing the necessary hardware and software tools to assist water distribution engineers in their design and planning work utilising fully dynamic all-mains models. However, many water supply companies still make important decisions based on static models that represent an arbitrary ...


    By Innovyze

  • Hysteresis effects of suspended sediment transport in relation to geomorphic conditions and dominant sediment sources in medium and large rivers of the Russian Arctic

    Preliminary analysis of long-term hydrological data shows that sediment dynamics of Russian Arctic rivers is largely affected by hysteresis effects in relation of water discharge to suspended sediment concentration (SSC). The role of large-scale geomorphic and geocryological conditions in sediment transport is still relatively understudied. This research aims to assess the links between ...


    By IWA Publishing

  • Modelling of suspended sediment in a weir reach using EFDC model

    Construction of hydraulic structures often leads to alteration of river dynamics and water quality. Suspended solids entering the upstream of the weir cause adverse effects to the hydroecological system and, therefore, it is necessary to build a modelling system to predict the changes in the river characteristics for proper water quality management. In this study, the discharges and total ...


    By IWA Publishing

  • Dynamic modelling of the fate of DDT in Lake Maggiore: Preliminary results

    Release of chemical substances significantly impacts European waters. Impacts are both direct and indirect, through degradation products, acute and/or chronic toxicity, and/or long-term effects via bioaccumulation in aquatic food chains. As the number of substances is large and measures to reduce emission are costly and time demanding, there is a necessary prioritisation of the efforts through ...


  • Routes of uptake of diclofenac, fluoxetine, and triclosan into sediment‐dwelling worms

    This study investigated the route and degree of uptake of two ionisable pharmaceuticals (diclofenac and fluoxetine) and one ionisable compound used in personal care products (triclosan) into the sediment dwelling worm, Lumbriculus variegatus. Studies were done on complete worms (‘feeding’) and worms where the head was absent (‘non‐feeding’) using 14C labelled ingredients. Biota sediment ...


    By John Wiley & Sons, Ltd.

  • Stability and sedimentation of silver nanoparticles in the presence of monovalent, divalent and trivalent electrolyte solutions

    The present study seeks to elucidate the effect of different electrolytes on the stability of citrate-coated silver nanoparticles synthesized by the reduction of the Ag(NH3)2+ complex via Tollens’ method. Time-resolved dynamic light scattering technique was used to measure the aggregation behavior of the nanoparticles over a range of electrolyte (NaCl, ...


    By IWA Publishing

  • Adsorption of tetracyclines on marine sediment during organic matter diagenesis

    The effect of decomposition and diagenesis of sediment organic matter (SOM) on the adsorption of emerging pollutants by the sediment has been seldom addressed. In the present experimental study, artificial sediment was incubated to simulate the natural organic diagenesis process and hence investigate the influence of organic diagenesis on the adsorption of tetracyclines (TCs) by marine sediment. ...


    By IWA Publishing

  • Trace metals: Inputs, sedimentation and accumulation in San Vicente Bay, Chile

    The present study deals with sediment dynamics affecting sediment-associated metal distributions in an embayment system experiencing pollution from coastal industries. Sedimentary metal content may originate from diagenetic processes of foundation rock on the bottom, allochthonous minerals from natural sources, and metals from industrial effluents along the coast. The study presents experimental ...


    By Springer

  • Application of multiple geochemical markers to investigate organic pollution in a dynamic coastal zone

    Multiple geochemical markers, including aliphatic hydrocarbons (n‐alkanes), linear alkylbenzenes (LABs), and polycyclic aromatic hydrocarbons (PAHs), were employed to relate sediment organic chemical pollution in the coastal zone off South China to socioeconomic development there. Concentrations of Σn‐C15‐35 (n‐alkanes with 15–35 carbon atoms), ΣLAB (sum of C10 to C13 LABs), and Σ26PAH (sum of ...


    By John Wiley & Sons, Ltd.

  • Former MGP Site Required a Sediment Treatment and Erosion Protection Solution

    A shoreline revetment and sediment capping project along the Collins Cove coast of Beverly, Massachusetts required an erosion solution. The Challenge: Trying to maintain a system that will prevent loss of soils in a dynamic coastal environment is always challenging. As in most erosion control applications the revetment is intended to protect the underlying geotextile. In this particular ...


    By CETCO

  • A Multi-Sensor Piezometer for Shallow Marine Sediments in Coastal Environments

    A multi-sensor piezometer has been developed to measure dynamic excess and ambient pore pressures in shallow marine sediments under the effect of surface waves, tides, and currents. The probe consists of a shaft (1.5 m long with five porous stones at subseafloor depths ranging from 0.10 to 0.93 m) and two upper chambers (one that is hermetically sealed for the transducer electronics and another ...


    By ASTM International

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