Effect of compaction on the acquisition of a detrital remanent magnetization in fine-grained sediments
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Measurements of the detrital remanent magnetization (DRM) of redeposited deep-sea sediment of the silty clay grade are described. Variations in the magnitude of an observed remanence inclination error are related to conditions of sediment accumulation, contrasted here as grain-by-grain settling from a dilute dispersion or by settling from a concentrated slurry. For these artificial redepositions post-depositional compaction is shown to be a major factor in shallowing the observed inclination from the ambient field inclination. The term compactive DRM is tentatively assigned to describe such behaviour.Keywords:
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Sediment settling velocity is an important parameter in particle suspension and indispensable link of hyperconcentrated flow as well as basic theory support for efficient sediment transport of Xiaolangdi Reservoir. This paper has adopted current sediment sample in Xiaolangdi Reservoir to take still water settling experiment, observed carefully silt sediment distribution during different settling duration under various initial concentrations, analyzed common settling velocity calculation method, and adopted settling duration curve method as calculation method to obtain a constant settling velocity of free settling section. Typical settling velocity that is obtained from experiments makes supplement and fitness to settling velocity formula of the existing groups of sediment sample, amends the formula coefficient, further explore the settling characteristics and settling velocity of fine particle mixed viscous sediment with water concentration change, and meanwhile this paper researched settling distance impact on settling velocity, existing sediment group settling transition to mesh settling critical transition silt concentration of Xiaolangdi Reservoir.
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Silt
Suspension
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The present paper deals with the formation process of settling interface. Settling experiments and settling simulations showed that the settling interface is caused by the horizontal percolation of settling particles. In the case of low solid content, dispersed particles and/or agglomerates repeat collisions in the initial stage of settling, and form a settling interface. In the case of high solid content, particles form a network structure immediately after the settling starts, causing the zone settling.
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Agglomerate
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Percolation (cognitive psychology)
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Numerical models for the prediction of turbulent flow field and suspended solid distribution in sedimentation tanks are characterized by refined modeling of hydrodynamics, but apparently weak modeling of settling properties of suspensions. It is known that sedimentation tanks typically treat highly heterodisperse suspensions, whose concentrations range from relatively high to low values. However, settling is modeled either by considering one or more particle classes of different settling velocity, without accounting for hindered settling conditions, or by treating the suspension as monodisperse, even in regions of low concentration. A new generalized settling model is proposed to account for both discrete settling conditions in low concentration regions of the tanks and hindered settling conditions in high concentration regions. Settling velocities of heterodisperse suspensions are then determined as a function of particle velocities in isolation and their total concentration. The settling model is used in the framework of a transport model for the simulation of hydrodynamics and solid distribution in a rectangular sedimentation tank. Results show that solid distribution is mainly affected by particle interactions in the inlet region and by settling properties of individual particles in the outlet region. Comparison of the proposed settling model with other settling models suggests that a generalized approach of the modeling of settling properties of suspensions is a primary concern to obtain reliable predictions of the removal rate.
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Sedimentation
Suspension
Particle (ecology)
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Nanocrystalline material
Melt spinning
Stoner–Wohlfarth model
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A depositional environment, also known as a sedimentary environment, is a physiography setting where sediments are deposited. A depositional setting can be a river, a lake, a delta, a lagoon and the vast ocean. Each depositional setting imparts distinctive signatures to the sediments which also includes the imprints of the paleoclimate, flora and fauna which flourished at the time. With climate change and passage of time the physiographic setting of that depositional environment location changes and the new deposits carry the signatures of the new settings. Hence, analysis of the sedimentary column at a location helps us decipher the past depositional environments and reconstruct the paleoenvironment and geologic history of the sedimentary basin.
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The analysis of regional structure,massive core samples,palaeon to logical,logging data reveals the depositional characteristics of sand groups,the rule of depositional microfacies distrubition in p lane,develops a set of deltaic front sandstones.Deltaic front includes distributary channel deposit,far sand dam and b ranch bay m icrofacies.With macroscopic depositional settings and microscopic depositional characteristics into consideration,river mou th bar, far sand dam and branch bay m-icrofacies.With macroscopic depositional settings and micro scopic depositional characteristics into consideration.Based on the log response of different sedimentary microfacies,the distribution character of the sedimentary facies in the plane is researched,and the facies sequence of this area are summed up.
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This paper presents an experimental study of the settling behaviour of fine-grained suspensions in a saline environment. The effect of flocculation is illustrated by frequency distribution curves for different settling diameters. The analyses were performed with a Sedigraph X-ray equipment. Observations of the settling process were made and distinction between different modes of settling are presented.
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Settling time
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This research is an experimental study on the settling process. Major topic is focused on the transition between gravitational settling and hindered settling, formation of shock wave, and settling behaviors at different water conditions. An array of Optical Backscatter Sensors (OBS) was used to monitor and track shock waves, and to calculate mass flux. Furthermore, the variation of settling velocity with concentration was obtained by depth-integrated mass conservation equation and position of maximum concentration gradient. The results reveals: Not only interaction between diffusive dispersion and gravitational settling have influence on settling behavior, but also buoyancy and aggregation will affect settling process as salinity changes. Two distinct settling mechanisms were found in this experiment, which are (1) diffusive dispersion dominate process in low sediment concentration and (2) hindered settling dominate process in high sediment concentration cases.
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Sedimentation
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