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Journal articles on the topic 'Sedimentation and deposition'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 July 2024

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1

Lee, S. S., and J. E. Penner. "Aerosol effects on ice clouds: can the traditional concept of aerosol indirect effects be applied to aerosol-cloud interactions in cirrus clouds?" Atmospheric Chemistry and Physics Discussions 10, no. 4 (2010): 10429–62. http://dx.doi.org/10.5194/acpd-10-10429-2010.

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Abstract. Cirrus clouds cover approximately 20–25% of the globe and thus play an important role in the Earth's radiation budget. This indicates that aerosol effects on cirrus clouds can have a substantial impact on the variation of global radiative forcing if the ice-water path (IWP) changes. This study examines the aerosol indirect effect (AIE) through changes in the IWP for a cirrus cloud case. We use a cloud-system resolving model (CSRM) coupled with a double-moment representation of cloud microphysics. Intensified interactions among the cloud ice number concentration (CINC), deposition and

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Miao, Huan, Jianying Guo, Yanbin Wang, Zhenxue Jiang, Chengju Zhang, and Chuanming Li. "Mineralogical and elemental geochemical characteristics of Taodonggou Group mudstone in the Taibei Sag, Turpan–Hami Basin: implication for its formation mechanism." Solid Earth 14, no. 9 (2023): 1031–52. http://dx.doi.org/10.5194/se-14-1031-2023.

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Abstract. Organic matter types in the Taodonggou Group mudstone exhibit significant differences with depth. In order to understand the formation mechanism of this special phenomenon, we analyzed the mineralogy and geochemistry of the mudstone, as well as the source rocks, depositional environment, and depositional processes of the Taodonggou Group. Based on this, we have gained the following insights. (1) The Taodonggou Group mudstone was deposited in an intermediate-depth or deep, dysoxic, freshwater–brackish lake environment under warm and humid paleoclimatic conditions. The input of terrest

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3

Stovin, Virginia R., and Adrian J. Saul. "Sedimentation in Storage Tank Structures." Water Science and Technology 29, no. 1-2 (1994): 363–72. http://dx.doi.org/10.2166/wst.1994.0684.

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Although storage tanks provide an effective means of reducing the magnitude and frequency of combined sewer overflow discharges, and thereby of alleviating urban watercourse pollution, poorly designed storage structures frequently suffer from maintenance problems arising from sedimentation. The development of design guidelines that optimise the self-cleansing operation of storage structures is clearly a priority for urban drainage research. This paper describes a system that has been developed to study sediment deposition in laboratory model-scale storage structures. The patterns of deposition

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4

Bonnas, Sylvia, Jan Tabellion, and Jürgen Haußelt. "Effect of Particle Size Distribution and Sedimentation Behaviour on Electrophoretic Deposition of Ceramic Suspensions." Key Engineering Materials 314 (July 2006): 69–74. http://dx.doi.org/10.4028/www.scientific.net/kem.314.69.

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By systematic interaction of sedimentation and electrical field in electrophoretic deposition the particle size distribution of the deposited green body can be influenced. This can be employed for producing coatings with a very smooth surface by deposition of only the nanosized fraction of a conventional powder with broad or non-monomodal size distribution, thus avoiding preceding classification. In this paper, the preparation of stabilised slurries is described focussing on the criteria particle size distribution, zeta-potential and sedimentation behaviour. The effectiveness of the interactio

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Kerkweg, A., J. Buchholz, L. Ganzeveld, A. Pozzer, H. Tost, and P. Jöckel. "Technical Note: an implementation of the dry removal processes DRY DEPosition and SEDImentation in the Modular Earth Submodel System (MESSy)." Atmospheric Chemistry and Physics Discussions 6, no. 4 (2006): 6853–901. http://dx.doi.org/10.5194/acpd-6-6853-2006.

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Abstract. We present the submodels DRYDEP and SEDI for the Modular Earth Submodel System (MESSy). Gas phase and aerosol dry deposition are calculated within DRYDEP, whereas SEDI deals with aerosol particle sedimentation. Dry deposition velocities depend on the near-surface turbulence and the physical and chemical properties of the surface cover (e.g. the roughness length, soil pH or leaf stomatal exchange). The dry deposition algorithm used in DRYDEP is based on the big leaf approach and is described in detail within this Technical Note. The sedimentation submodel SEDI contains two sedimentati

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Kerkweg, A., J. Buchholz, L. Ganzeveld, A. Pozzer, H. Tost, and P. Jöckel. "Technical Note: An implementation of the dry removal processes DRY DEPosition and SEDImentation in the Modular Earth Submodel System (MESSy)." Atmospheric Chemistry and Physics 6, no. 12 (2006): 4617–32. http://dx.doi.org/10.5194/acp-6-4617-2006.

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Abstract. We present the submodels DRYDEP and SEDI for the Modular Earth Submodel System (MESSy). Dry deposition of gases and aerosols is calculated within DRYDEP, whereas SEDI deals with aerosol particle sedimentation. Dry deposition velocities depend on the near-surface turbulence and the physical and chemical properties of the surface cover (e.g. the roughness length, soil pH or leaf stomatal exchange). The dry deposition algorithm used in DRYDEP is based on the big leaf approach and is described in detail within this Technical Note. The sedimentation submodel SEDI contains two sedimentatio

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Tupe, Rahul R., and Prof Rashmi S. Yadiyapur. "Sedimentation Analysis of Ujani Dam." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 01 (2024): 1–13. http://dx.doi.org/10.55041/ijsrem28273.

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Abstract -The sedimentation is an effect of erosion on the catchment area of the reservoir and therefore, lesser the rate of erosion, smaller is the sediment load coming into the reservoir. Deposition of sedimentation in the reservoir moderately reduces the capacity of the reservoir. Both Dead storage capacity & live storage capacity gets affected due to sedimentation. Information about reduction in the storage capacity is important for the planning and operational purposes and the same can be obtained by sediment assessment surveys done at regular intervals. Various factors affect the pro

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Liverman, David G. E. "Sedimentation in ice-dammed Hazard Lake, Yukon." Canadian Journal of Earth Sciences 24, no. 9 (1987): 1797–806. http://dx.doi.org/10.1139/e87-171.

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"Hazard Lake," located in Kluane National Park, the Yukon, is an ice-dammed lake formed in 1966 by the surge of the Steele Glacier. Since 1975 it has drained annually by means of a subglacial tunnel. During July 1979, observations were made of lake processes before drainage and of sections described in the lake bottom after drainage. Three facies associations are believed to represent prelake, stable lake, and annual draining phases. Gravel commonly found at the base of sections represents deposition in a braided fluvial system prior to 1966. Lake sediments deposited between 1966 and 1975 are

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Lee, S. S., and J. E. Penner. "Aerosol effects on ice clouds: can the traditional concept of aerosol indirect effects be applied to aerosol-cloud interactions in cirrus clouds?" Atmospheric Chemistry and Physics 10, no. 21 (2010): 10345–58. http://dx.doi.org/10.5194/acp-10-10345-2010.

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Abstract. Cirrus clouds cover approximately 20–25% of the globe and thus play an important role in the Earth's radiation budget. Therefore the effect of aerosols on cirrus clouds can have a substantial impact on global radiative forcing if either the ice-water path (IWP) and/or the cloud ice number concentration (CINC) changes. This study examines the aerosol indirect effect (AIE) through changes in the CINC and IWP for a cirrus cloud case. We use a cloud-system resolving model (CSRM) coupled with a double-moment representation of cloud microphysics. Intensified interactions among CINC, deposi

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10

Apak, S. N., W. J. Stuart, and N. M. Lemon. "COMPRESSIONAL CONTROL ON SEDIMENT AND FACIES DISTRIBUTION SW NAPPAMERRI SYNCLINE AND ADJACENT MURTEREE HIGH, COOPER BASIN." APPEA Journal 35, no. 1 (1995): 190. http://dx.doi.org/10.1071/aj94013.

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The northeast-trending Nappamerri Syncline and its flanking high to the southeast, the Murteree-Nappacoongee (NM) Trend, show structural development throughout the deposition of the Permo-Triassic Cooper Basin sequences. Pre-existing topography, such as around Moomba, influenced early depositional patterns within the area. Rates of sedimentation were influenced by the rate of uplift of source areas around the basin, largely as a consequence of buckling. Periods of active tectonism resulted in non-deposition and stripping of sediments from uplifted blocks while deposition continued in deeper ar

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Campos, Jody, Iran Eduardo Lima Neto, Ticiana Marinho Studart, and José Nilson Beserra Campos. "Influence of sediment distribution on the relationships among reservoir yield, spill, and evaporation losses." Engenharia Sanitaria e Ambiental 23, no. 5 (2018): 849–56. http://dx.doi.org/10.1590/s1413-41522018177058.

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ABSTRACT This study shows how the sedimentation process in reservoirs affects the yield-spill-evaporation losses in reservoirs of Ceará State, Brazilian Northeast. Reservoirs are assumed to have, initially, inverted conical shape. Three forms of sedimentation were investigated: type 1, with deposition occurring parallel to the wetted perimeter; type 2, deposition distributed proportionally to the water depth; and, type 3, deposition concentrated in the reservoir bottom. These sedimentation patterns were found in many reservoirs in Ceará, with capacity ranging from about 0.5 to 100 hm3. Neverth

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Ren, Zhihui, Ting Wang, Yuanjian Wang, and Shaojun Qu. "A study on the characteristics and influencing factors of reservoir sedimentation in Wanjiazhai Reservoir." MATEC Web of Conferences 246 (2018): 01046. http://dx.doi.org/10.1051/matecconf/201824601046.

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Based on measured data of the Wanjiazhai Reservoir in different periods, the characteristics of the spatial and temporal distribution of sedimentation in the reservoir area were preliminarily analyzed and the impact of reservoir operation on this distribution was discussed. Primary conclusions are as followed: in terms of temporal distribution, sedimentation continuously accumulated over the period from 2000 to 2017, with the sediment deposition ratio dramatically decreasing between 2011 and 2017; in terms of spatial distribution, the sedimentation in the reservoir area was mainly concentrated

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13

Feng, Xiao Xiang, Zhe Liu, and Xing Kui Wang. "Application Comparison about Sediment Deposition in Outer Channel by Three-Layer Mode and Analog Analysis Mode." Applied Mechanics and Materials 130-134 (October 2011): 1638–44. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.1638.

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Sudden sedimentation is an important subject for building ports in silt-sandy coast. It elaborates calculation methods detailed about three-layer deposition mode and analogy analysis mode. And they are used to predict the deposition in outer channel of Binzhou Port. Comparative results show that they are basically same on the distribution of sudden sedimentation, deposition thickness and volume along the channel. And it is larger from three-layer deposition mode than analogy analysis mode. The formal mode is propitious to project security. By analyzing the characteristics and applicability abo

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YU, C. P., B. ASGHARIAN, and B. M. YEN. "Impaction and Sedimentation Deposition of Fibers in Airways." American Industrial Hygiene Association Journal 47, no. 2 (1986): 72–77. http://dx.doi.org/10.1080/15298668691389388.

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Markova, Irina, and Yuliya Bryanskaya. "Restrained fall velocity of suspended solids particles sedimentation in still water." E3S Web of Conferences 91 (2019): 07004. http://dx.doi.org/10.1051/e3sconf/20199107004.

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The deposition rate is sufficiently studied in the case of single particles or in conditions of low concentrations of suspended matter, in which the precipitating particles do not affect each other. In the article, the method of calculation of the rate of the constrained deposition is offered, comparative calculations of the rate of the free and constrained deposition of particles are executed, the settlement results reflecting essential difference of the speed of the constrained and free deposition of particles are presented. The factors influencing the rate of confined deposition, among whic

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16

Koster, Kay, Jan Stafleu, Peter C. Vos, and Michiel J. van der Meulen. "Can we elevate the subsiding coastal plain of the Netherlands with controlled sedimentation?" Proceedings of the International Association of Hydrological Sciences 382 (April 22, 2020): 767–73. http://dx.doi.org/10.5194/piahs-382-767-2020.

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Abstract. Half the surface area of the coastal plain of the Netherlands has been subsiding below mean sea-level as a result of peatland drainage. At present, the low elevation is sustained, because sedimentation necessary to aggrade the coastal plain back to natural elevations is hampered by engineering structures. Alternatively, controlled sedimentation is a discussed method to elevate the coastal plain. This can either be achieved by allowing water courses to deliver sediments to designated areas, or by anthropogenic deposition. Here, we assess the possibilities of this strategy by determini

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Huang, Shu You, Zhi Gang Yin, Jin Guang Zhang, Yu Shan Ren, and Jing Hai Zhou. "Research the Problem about the Silted Deposition of the Broken Model." Applied Mechanics and Materials 204-208 (October 2012): 279–83. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.279.

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On the foundation of the item that the residence flood controlled technique and standard tested and the analysis according to the formation of the sediment and the regulation of the sedimentation in the actual river. In the process of the studied item, design a kind of a new sedimentation basin in order to lower the sand carrying capacity of the down water in the limited distance and the biggest limit. Through the model experiment of this kind of the sedimentation basin and find out the result of the sink the sand under the different discharge, in order to guide the actual engineering applicat

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Yamamuro, Jerry A., Fletcher M. Wood, and Poul V. Lade. "Effect of depositional method on the microstructure of silty sand." Canadian Geotechnical Journal 45, no. 11 (2008): 1538–55. http://dx.doi.org/10.1139/t08-080.

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The results from a laboratory experimental study on silty sand are presented. A scanning electron microscope (SEM) was used to investigate the effect of depositional method and silt content on the grain contact structure of silty sand. Triaxial specimens containing Nevada sand with various quantities of nonplastic silt were isotropically consolidated to 25 kPa and then preserved through epoxy impregnation. Specimens were formed using both dry funnel deposition and water sedimentation. A procedure was developed that allowed the microstructure to be quantified in terms of potentially stable and

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Devi, Salam Ranjeeta. "Geochemistry, Depositional and Tectonic setting of the Barail Group of the Indo-Myanmar Ranges." Journal of The Indian Association of Sedimentologists 38, no. 1 (2021): 13–22. http://dx.doi.org/10.51710/jias.v38i1.103.

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The present paper deals with the study of the depositional environment and tectonic setting during the sedimentation of the Barail Group of rocks of the Indo-Myanmar Ranges (IMR). The Barail Group (Oligocene) consist of sandstone intercalated with shale and siltstone. Geochemical study suggests low to high degree of chemical weathering. ICV vs. CIA, Al2O3 vs. TiO2 diagrams indicate that the sediments were derived from the multiple source rocks dominantly of mafic composition. Arid to semi-arid/semi-humid climate prevailed during the deposition of the Barail Group sediments. Sedimentation occur

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Ismayilova, F. B. "Formation of sedimentation in oil mixing." Azerbaijan Oil Industry, no. 12 (December 15, 2020): 36–38. http://dx.doi.org/10.37474/0365-8554/2020-12-36-38.

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As a result of the studies on the impact of the mixing of various sorts of Azerbaijani oils on their quality parameters, it was defined that in some correlations oil mixing is impossible as both rheological and physico-chemical parameters of these oils after mixing abnormally change. In the context of the oils from Bulla and Garachukhur fields it was specified that in 58:42 ratio percentage correspondingly, abnormal phenomenon is observed in parameter change. Moreover, various ballast deposition occurs due to the mixing. The paper studies the kinetics of deposition of different ballasts (resin

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Wang, Jianfu, Xin Kang, and Chunyin Peng. "Modelling and Experimental Investigation on the Settling Rate of Kaolinite Particles in Non-Ideal Sedimentation Stage under Constant Gravity." Materials 13, no. 17 (2020): 3785. http://dx.doi.org/10.3390/ma13173785.

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We compared the catalytic effects of two polymers (soluble starch and apple pectin) on the flocculation of kaolinite suspension. Moreover, the relationship between the zeta potential value and the time when kaolin particle sedimentation occurred was verified, and the mechanism of flocculation was analyzed. Additionally, a constitutive model was proposed to simulate the non-ideal sedimentation of clay particles in an aqueous system under constant gravity. This model not only considers the inhomogeneity of the solute but also simulates the change in clay concentration with time during the deposi

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Castro, Clovis Barreira e., Bárbara Segal, Fábio Negrão, and Emiliano Nicolas Calderon. "Four-year monthly sediment deposition on turbid southwestern Atlantic coral reefs, with a comparison of benthic assemblages." Brazilian Journal of Oceanography 60, no. 1 (2012): 49–63. http://dx.doi.org/10.1590/s1679-87592012000100006.

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High sedimentation is often related to stress in coral reef communities. Most southwestern Atlantic reefs are characterized by high sedimentation. However, there are no temporal series of sediment deposition rates. We evaluated sediment deposition, the sediment carbonate composition and coral and zoanthid covers on six reefs in Brazil over four-years. Sediment deposition rates varied from near zero to 233 mg cm-2 day-1, with peaks between August and December, and yearly averages ranging from nine to 104 mg cm-2 day-1. Deposition rates presented site-specific correlations with wind, indicating

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Pavlenko, Ivan, Marek Ochowiak, Praveen Agarwal, Radosław Olszewski, Bernard Michałek, and Andżelika Krupińska. "Improvement of Mathematical Model for Sedimentation Process." Energies 14, no. 15 (2021): 4561. http://dx.doi.org/10.3390/en14154561.

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In this article, the fractional-order differential equation of particle sedimentation was obtained. It considers the Basset force’s fractional origin and contains the Riemann–Liouville fractional integral rewritten as a Grunwald–Letnikov derivative. As a result, the general solution of the proposed fractional-order differential equation was found analytically. The belonging of this solution to the real range of values was strictly theoretically proven. The obtained solution was validated on a particular analytical case study. In addition, it was proven numerically with the approach based on th

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Engkilde, Michael, and Finn Surlyk. "Shallow marine syn-rift sedimentation: Middle Jurassic Pelion Formation, Jameson Land, East Greenland." Geological Survey of Denmark and Greenland (GEUS) Bulletin 1 (October 28, 2003): 813–63. http://dx.doi.org/10.34194/geusb.v1.4690.

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The Middle Jurassic Pelion Formation – Fossilbjerget Formation couplet of Jameson Land, East Greenland, is a well-exposed example of the Middle Jurassic inshore–offshore successions characteristic of the rifted seaways in the Northwest European – North Atlantic region. Early Jurassic deposition took place under relatively quiet tectonic conditions following Late Permian – earliest Triassic and Early Triassic rift phases and the Lower Jurassic stratal package shows an overall layer-cake geometry. A long-term extensional phase was initiated in Middle Jurassic (Late Bajocian) time, culminated in

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Dun, Hongchao, Guowei Xin, Ning Huang, Guangtian Shi, and Jie Zhang. "Wind-Tunnel Studies on Sand Sedimentation Around Wind-Break Walls of Lanxin High-Speed Railway II and Its Prevention." Applied Sciences 11, no. 13 (2021): 5989. http://dx.doi.org/10.3390/app11135989.

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Wind-break walls along Lanxin High-Speed Railway II were studied and approved as effective measures to reduce strong wind damage to the high-speed trains. The results show that sand sedimentation on the leeward sides of wind-break walls along the railway within Gobi Desert could significantly threaten the operation safety of running trains. Different from the current sand sedimentation prevention measures without adequate consideration of the deposition process of airborne sand particles, this study revealed the mechanism of sand sedimentation on the leeward sides of three wind-break walls wit

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Theol, Shaimaa A., Bert Jagers, F. X. Suryadi, and Charlotte de Fraiture. "The Role of Gate Operation in Reducing Problems with Cohesive and Non-Cohesive Sediments in Irrigation Canals." Water 11, no. 12 (2019): 2572. http://dx.doi.org/10.3390/w11122572.

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Sediments cause serious problems in irrigation systems, adversely affecting canal performance, driving up maintenance costs and, in extreme cases, threatening system sustainability. Multiple studies were done on the deposition of non-cohesive sediment and implications for canal design, the use of canal operation in handling sedimentation problems is relatively under-studied, particularly for cohesive sediments. In this manuscript, several scenarios regarding weirs and gate operation were tested, using the Delft3D model, applied to a case study from the Gezira scheme in Sudan. Findings show tha

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Saraiva, L. B., C. G. Ribeiro Meneses, H. N. de Souza Melo, A. L. Calado Araújo, and H. Pearson. "Determination of the sedimentation constants for total suspended solids and the algal component in a full-scale primary facultative pond operating at high wind velocities under tropical conditions." Water Science and Technology 51, no. 12 (2005): 213–16. http://dx.doi.org/10.2166/wst.2005.0465.

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This study evaluated the amount, distribution and sedimentation constant of solids in a full-scale primary facultative pond operating mostly under high wind conditions and the contribution made by the algal biomass. Solids deposition rates were measured using sedimentation traps placed in the inlet and outlet zones of the pond. Most sludge accumulation occurred, not surprisingly, in the inlet zone A1 with a sludge volume of 9072 m3 accumulating over an operating time of approximately 3 years. However, sludge deposition within this zone was uneven and affected by wind action. Mean proportionali

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Stratmann, Frank, Heinz Fissan, and Thomas Peterson. "Particle Deposition Onto a Flat Surface from a Point Particle Source." Journal of the IEST 31, no. 6 (1988): 39–41. http://dx.doi.org/10.17764/jiet.1.31.6.n65256516m648901.

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A series of two-dimensional calculations are performed to determine particle fluxes to wafers in a stagnation flow configuration. Mechanisms that influenced particle deposition included convection, diffusion, sedimentation, and thermophoresis. Particle deposition patterns resulting from a uniform freestream concentration are compared with deposition patterns from a narrow particle beam.

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Darquenne, C., K. L. Zeman, R. C. Sá, et al. "Removal of sedimentation decreases relative deposition of coarse particles in the lung periphery." Journal of Applied Physiology 115, no. 4 (2013): 546–55. http://dx.doi.org/10.1152/japplphysiol.01520.2012.

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Lung deposition of >0.5-μm particles is strongly influenced by gravitational sedimentation, with deposition being reduced in microgravity (μG) compared with normal gravity (1G). Gravity not only affects total deposition, but may also alter regional deposition. Using gamma scintigraphy, we measured the distribution of regional deposition and retention of radiolabeled particles (99mTc-labeled sulfur colloid, 5-μm diameter) in five healthy volunteers. Particles were inhaled in a controlled fashion (0.5 l/s, 15 breaths/min) during multiple periods of μG aboard the National Aeronautics and Space

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Zhang, Yuanpei, Jun Xie, Kuiyan Gu, Haibo Zhao, Chuanhua Li, and Xiaofan Hao. "Sedimentary Characteristics and Model of Lacustrine Deep Water Gravity Flow in the Third Member of Paleogene Shahejie Formation in Niuzhuang Sag, Bohai Bay Basin, China." Journal of Marine Science and Engineering 11, no. 8 (2023): 1598. http://dx.doi.org/10.3390/jmse11081598.

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This article studies the sedimentary characteristics and models of the delta and gravity flow system of the third member of the Shahejie Formation in the Niuzhuang Sag area. Through seismic, logging, and core observation methods, a thorough investigation is conducted to examine the lithologic characteristics, grain size characteristics, sedimentary structure characteristics, and sedimentary facies distribution characteristics of this region. The results show that the third middle member of the Shahejie Formation in the Niuzhuang Sag can be classified into four sedimentary types: sliding, colla

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Vähäkuopus, Tuija, Tommi Kauppila, Jari Mäkinen, Antti E. K. Ojala, and Samu E. Valpola. "Sedimentation Patterns of Multiple Finnish Lakes Reveal the Main Environmental Stressors and the Role of Peat Extraction in Lake Sedimentation." Geosciences 10, no. 8 (2020): 313. http://dx.doi.org/10.3390/geosciences10080313.

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Human land-use activities, especially in the peatlands, are under consideration as the mitigation and lowering of CO2 emissions from land-use practices is needed to address climate change. In Finland, approximately one third of the land surface is covered by peatlands, and around 50% of peatlands are ditched for forestry. Another 3% of peatlands are used for agriculture and approximately 1% for peat extraction. The effects of these different land-use practices, including changes in sediment depositional rates and sediment quality, need to be identified. This study analyzed 51 lakes that were s

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Maina, Caroline W., Joseph K. Sang, Benedict M. Mutua, and James M. Raude. "A review of radiometric analysis on soil erosion and deposition studies in Africa." Geochronometria 45, no. 1 (2018): 10–19. http://dx.doi.org/10.1515/geochr-2015-0085.

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Abstract Soil erosion is one of the main soil degradation phenomena that threaten sustainable use of soil productivity thus affecting food security. In addition, it leads to reservoir storage capacity loss because of sedimentation. This not only affects water quantity but also water quality. Worldwide, annual loss in reservoir storage capacity due to sedimentation is 0.5 to 1%. Similarly, about 27% of land in Africa is largely degraded by erosion. As a result, there is need to minimize soil erosion and deposition through site specific estimation of soil erosion and deposition rates in the rese

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Hoque, Ashabul, Dipankar Kumar, Anip Kumar Paul, Masudar Rahman, Gour Chandra Paul, and Shin Ichi Aoki. "Sedimentation in Dune Forests, Mangrove Forests and CC Block System and Associated Topographic Changes." Journal of Bangladesh Academy of Sciences 43, no. 1 (2019): 67–78. http://dx.doi.org/10.3329/jbas.v43i1.42235.

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This paper is concerned with the deposition of sediment due to dune forests (Nakatajima dune, Japan) and CC block system on a riverbank (Padma, Bangladesh). Measurements of sediment deposition were carried out at Nakatajima dune, Japan and at Padma riverbank, Rajshahi, Bangladesh using Global Positioning System (GPS). 2442 m3 sediment migrates each year to the East side of Nakatajima dune by wind and the edge of the dune develops about 6-7 m/year due to the existence of forests. Sedimentation rate is also greater in shallower mangrove areas. The trapped sediment height varies from 8.0 to 10.0

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Cuddington, K., and P. R. Leavitt. "An individual-based model of pigment flux in lakes: implications for organic biogeochemistry and paleoecology." Canadian Journal of Fisheries and Aquatic Sciences 56, no. 10 (1999): 1964–77. http://dx.doi.org/10.1139/f99-108.

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Vertical fluxes of pigments are used in limnology to monitor phytoplankton abundance, herbivore grazing, ecosystem efficiency, and historical changes in production. However, significant pigment degradation can occur during algal sedimentation. We used an individual-based model of pigment flux to quantify the relative importance of production and degradation as controls of pigment sedimentation. Pigment deposition increased with production, sinking rate, and phytoplankton depth and declined as lake depth and the depth of oxygen penetration increased. Unexpectedly, pigment sedimentation rate was

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Lee, H. N., and J. K. Shi. "An alternative approach for atmospheric plume deposition and sedimentation." International Journal of Environmental Studies 25, no. 1-2 (1985): 109–26. http://dx.doi.org/10.1080/00207238508710214.

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Wood, Fletcher M., Jerry A. Yamamuro, and Poul V. Lade. "Effect of depositional method on the undrained response of silty sand." Canadian Geotechnical Journal 45, no. 11 (2008): 1525–37. http://dx.doi.org/10.1139/t08-079.

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The results from a laboratory experimental study on silty sand are presented. Undrained triaxial compression tests were performed on Nevada sand containing nonplastic silt. All specimens underwent monotonic loading after isotropic consolidation to 25 kPa. Various depositional techniques were used to create specimens to compare their stress–strain behavior within three separate density ranges and three different silt contents. As density increased, the effect of the depositional method on the undrained behavior decreased. The influence of the depositional method on specimen behavior also was fo

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Wang, Yang, Yufei Wang, Xiaoming Wan, et al. "Influence of the Hanjiang River’s Inlet Sediment Decrease on Modern Sedimentation in the Underwater Delta." Applied Sciences 13, no. 14 (2023): 8039. http://dx.doi.org/10.3390/app13148039.

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The Hanjiang River is the second-largest river in Guangdong Province, China. The modern sedimentation pattern of the Hanjiang subaqueous delta has been significantly affected by changes in the sediment delivered by the Hanjiang River. Based on multiperiod charts and columnar samples from the Hanjiang subaqueous delta, the influence of a sharp decrease in the sediment flux from the Hanjiang River on the deposition of the Hanjiang subaqueous delta in the past 60 years was studied through a combination of chart-based analysis of the evolution of erosion and deposition and the analysis of sediment

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Aleksandrovskii, A. L., V. N. Golosov, and I. V. Zamotaev. "Sedimentation rates on the floodplains of lowland rivers in the center of the European Part of Russia according to the study of soil-alluvial chronosequences." Геоморфология и палеогеография 54, no. 1 (2023): 17–36. http://dx.doi.org/10.31857/s2949178923010036.

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The floodplain deposition rates for the Istra, Oka and Seim rivers valleys were estimated based on a combination of dating methods (radiocarbon, radiocesium and historical-archaeological) for various time windows of the Holocene. In addition, a new method to estimated sedimentation rate, based on the assessment of the degree of soil profile development of paleosols buried in alluvium was applied. Spatio-temporal differences in the rates of floodplain sedimentation have been established based on chronological and soil-geomorphological studies. It was found that sedimentation rates on the young

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Ou, Cuiyun, Jian Hang, Jiajia Hua, et al. "Particle Deposition in Large-Scale Human Tracheobronchial Airways Predicted by Single-Path Modelling." International Journal of Environmental Research and Public Health 20, no. 5 (2023): 4583. http://dx.doi.org/10.3390/ijerph20054583.

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The health effects of particles are directly related to their deposition patterns (deposition site and amount) in human airways. However, estimating the particle trajectory in a large-scale human lung airway model is still a challenge. In this work, a truncated single-path, large-scale human airway model (G3–G10) with a stochastically coupled boundary method were employed to investigate the particle trajectory and the roles of their deposition mechanisms. The deposition patterns of particles with diameters (dp) of 1–10 μm are investigated under various inlet Reynolds numbers (Re = 100–2000). I

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Guo, Shuai Jie, Bao Tian Wang, Fu Hai Zhang, and Liang Chen. "Settlement and Consolidation Mechanism of Cohesive Sedimentation in Estuarine Environment." Advanced Materials Research 261-263 (May 2011): 1454–58. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.1454.

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Estuarine area is the intersection zone of river estuary, coastal and land-phase. Cohesive sediment deposition for mutation affects estuary channel transport and brings great challenges to dredging project. Consolidation indicators are closely related to sedimentation and dredging, and there are apparent errors in application of Terzaghi theory in cohesive sediment consolidation evaluation for large stain characteristics. Then it is necessary to modify some consolidation parameters to extend Terzaghi theory in cohesive sediment consolidation. Considering a whole process of sedimentation and co

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Hasthi, Saputra, Lilin Budiati, and Rukuh Setiadi. "IDENTIFIKASI KONDISI EKSISTING DAN DAMPAK SEDIMENTASI PADA SUNGAI KREO DAN KALIGARANG KOTA SEMARANG." saintifika 24, no. 2 (2023): 95. http://dx.doi.org/10.25037/saintifika.v24i2.133.

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The Garang watershed which includes the Kreo River and the Kaligarang River is an ecosystem unit that is limited by topographical separators and functions as a collector, storage, and distributor of water, nutrients, and sediment through the river's hydrological system. Garang watershed plays an important role in achieving Sustainable Development Goals (SDGs) 6 related to clean water, namely supplying drinking water raw materials in the city of Semarang experiencing environmental damage due to sedimentation common in river systems in Indonesia. Sedimentation occurs due to the deposition of fra

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Marysyk, S. V. "DETERMINATION OF HYDRAULIC GRAIN SIZE OF NATURAL AND ARTIFICIAL SORBENTS FOR SIMULATION OF SETTLE FACILITY." Міжвідомчий тематичний науковий збірник "Меліорація і водне господарство", no. 2 (December 21, 2022): 94–99. http://dx.doi.org/10.31073/mivg202202-346.

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In the conditions of progressive contamination of surface sources of water supply and inefficient wastewater treatment when using existing water treatment technologies, the research problem and the justification of the use of sorption materials for the retention of specific pollutants, in particular heavy metal ions and radionuclides, is urgent. The parameters that determine the efficiency of sorbents are indicators of their sedimentation rate. The purpose of the experiments was to determine the sedimentation rate indicators for bentonite and copper ferrocyanide, build sorbent sedimentation gr

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Tsuda, A., J. P. Butler, and J. J. Fredberg. "Effects of alveolated duct structure on aerosol kinetics. II. Gravitational sedimentation and inertial impaction." Journal of Applied Physiology 76, no. 6 (1994): 2510–16. http://dx.doi.org/10.1152/jappl.1994.76.6.2510.

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We studied the effects of alveolated duct structure on deposition processes for particle diameters > or = 1 micron. For such large particles, Brownian motion is insignificant but gravity and inertial forces play an important role. A Lagrangian description of particle dynamics in an alveolated duct flow was developed, and computational analysis was performed over the physiologically relevant range. At low flow rates gravity caused deposition. Gravitational cross-streamline motion depended on the coupled effects of curvature of gas streamlines and duct orientation relative to gravity. The det

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Yang, Dongfang, Tao Jiang, Linzhen Wei, Shengjun Zhang, and Xinmin Huang. "The Lowest Deposition of Hg Content is in the Jiaozhou Bay Center." E3S Web of Conferences 233 (2021): 03041. http://dx.doi.org/10.1051/e3sconf/202123303041.

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Based on the investigation data of Jiaozhou Bay in 1992, this thesis studied the present situation and horizontal distribution of Hg content in the bottom of Jiaozhou Bay mouth. The results showed that in May, August and October, the range of Hg content in the bottom ofJiaozhou Bay was 0.007-0.040 μg/L, which was in line with the national water quality standard for class I seawater. This showed that in terms of Hg content, the bottom water of Jiaozhou Bay from the center of the bay to the south of the bay mouth was not polluted by any Hg content in May, August and October. In the bottom of Jia

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Atar, Elizabeth, Andrew C. Aplin, Violaine Lamoureux-Var, Christian März, and Thomas Wagner. "Sedimentation of the Kimmeridge Clay Formation in the Cleveland Basin (Yorkshire, UK)." Minerals 10, no. 11 (2020): 977. http://dx.doi.org/10.3390/min10110977.

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Fine-grained sedimentary successions contain the most detailed record of past environmental conditions. High-resolution analyses of these successions yield important insights into sedimentary composition and depositional processes and are, therefore, required to contextualise and interpret geochemical data which are commonly used as palaeoclimate proxies. The Kimmeridge Clay Formation (KCF) is a 500 m-thick mudstone succession deposited throughout the North Sea in the Late Jurassic and records environmental conditions through this time. Here, we present petrographic analyses (on 36 thin sectio

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Isdarmanto, Isdarmanto, and Oentoeng Soebyanto. "ANALISIS POTENSI PANTAI GLAGAH SEBAGAI EKOWISATA UNGGULAN DI KABUPATEN KULONPROGO." Kepariwisataan: Jurnal Ilmiah 12, no. 02 (2018): 1–12. http://dx.doi.org/10.47256/kepariwisataan.v12i02.82.

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Glagah Beach is one of the most potential beaches and has the uniqueness as the charm and excellence of other southern seas. Glagah Beach located in Kulon Progo Regency is the only beach in Java that has a breakwater and has a lagoon on the edge of the sea separated by the sea so that large waves do not reach the lagoon. According to the typology of Glagah beach it self can be included in the classification of marine deposition coast. This is because the beach is formed due to the deposition deposition of river sedimentation material to the sea. This condition can be indicated by the emergence

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Darquenne, Chantal, John B. West та G. Kim Prisk. "Dispersion of 0.5- to 2-μm aerosol in μG and hypergravity as a probe of convective inhomogeneity in the lung". Journal of Applied Physiology 86, № 4 (1999): 1402–9. http://dx.doi.org/10.1152/jappl.1999.86.4.1402.

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We used aerosol boluses to study convective gas mixing in the lung of four healthy subjects on the ground (1 G) and during short periods of microgravity (μG) and hypergravity (∼1.6 G). Boluses of 0.5-, 1-, and 2-μm-diameter particles were inhaled at different points in an inspiration from residual volume to 1 liter above functional residual capacity. The volume of air inhaled after the bolus [the penetration volume (Vp)] ranged from 150 to 1,500 ml. Aerosol concentration and flow rate were continuously measured at the mouth. The dispersion, deposition, and position of the bolus in the expired

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Fakhruddin, Rakhmat. "Fluvial-Tidal to Fluvial-Lacustrine Sedimentation of the Middle Miocene to Pleistocene Mapia Formation, Dogiyai, Papua (Indonesia)." Sains Malaysiana 50, no. 7 (2021): 1885–99. http://dx.doi.org/10.17576/jsm-2021-5007-05.

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A sedimentological and palynological investigation was carried out on outcropping sedimentary rocks at Dogiyai, Papua, proposed to be named as the Mapia Formation. The age range is from Middle Miocene to Pleistocene. The lower Mapia Formation was deposited at Metroxylon type to Nothofagus emarcida Zone, Middle Miocene to Early Pliocene. It is comprised of three facies associations: tidal channel, tidal point bar, and tidal flat deposits. A tidally dominated fluvially influenced depositional environment is suggested for the deposition of sediments of this unit. The upper Mapia Formation was dep

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Muhs, Daniel R., John P. McGeehin, Jossh Beann, and Eric Fisher. "Holocene loess deposition and soil formation as competing processes, Matanuska Valley, Southern Alaska." Quaternary Research 61, no. 3 (2004): 265–76. http://dx.doi.org/10.1016/j.yqres.2004.02.003.

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Although loess–paleosol sequences are among the most important records of Quaternary climate change and past dust deposition cycles, few modern examples of such sedimentation systems have been studied. Stratigraphic studies and 22 new accelerator mass spectrometry radiocarbon ages from the Matanuska Valley in southern Alaska show that loess deposition there began sometime after ∼6500 14C yr B.P. and has continued to the present. The silts are produced through grinding by the Matanuska and Knik glaciers, deposited as outwash, entrained by strong winds, and redeposited as loess. Over a downwind

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Kusumgar, Sheela, D. P. Agrawal, and Prabhakar Sharma. "Radiocarbon Chronology and Magnetic Susceptibility Variation in Kumaon Lake Sediments." Radiocarbon 31, no. 03 (1989): 957–64. http://dx.doi.org/10.1017/s0033822200012583.

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This study was carried out to determine time controls of erosion and sedimentation in the catchment area and lakes of the Naini Tal district in the Kumaon Himalayas. We present here our preliminary data from five lakes, Beon Tal, Garud Tal, Sukha Tal, Bhim Tal and Kamal Tal (Naukuchia Tal). A number of 14C dates are now available to estimate the sedimentation rate of the five lakes and magnetic susceptibility (xL; xfd) variation to determine the signature of sediment source. High xfd values indicate a higher proportion of soil component generally characterized by a slower rate of deposition, a

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