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Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 29 січня 2023

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Статті в журналах з теми "River channels Computer simulation"

1

Yapa, Poojitha D., Hung Tao Shen, Steven F. Daly, and Stephen C. Hung. "Oil Spill Simulation in Rivers." International Oil Spill Conference Proceedings 1991, no. 1 (March 1, 1991): 593–600. http://dx.doi.org/10.7901/2169-3358-1991-1-593.

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ABSTRACT Computer models recently have been developed for simulating oil slick transport in rivers, including the connecting channels of the Great Lakes, the upper St. Lawrence River, and the Allegheny-Monongahela-Ohio River system. In these models, a Lagrangian discrete-parcel algorithm is used to determine the location and concentration distribution of the oil in the river as well as the deposition of oil on the shore. The model for the Great Lakes connecting channels (ROSS) is a two-dimensional surface slick model which considers advection, spreading, horizontal diffusion, evaporation, dissolution, and shoreline deposition. The model is applicable to both open water and ice covered conditions. Models for the St. Lawrence River and the Ohio River System are developed based on a two-layer scheme (ROSS2) which considers vertical mixing and emulsiflcation processes in addition to the processes considered in the surface slick model. All of these models are implemented on microcomputers and can be used as integral parts of oil spill response programs to assist cleanup actions.
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2

Shokirov, B., B. Norkulov, Kh Nishanbaev, M. Khurazbaev, and B. Nazarov. "Computer simulation of channel processes." E3S Web of Conferences 97 (2019): 05012. http://dx.doi.org/10.1051/e3sconf/20199705012.

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The article discusses the results of numerical studies of flow movement with a sharp change in the channel parameters. The numerical study of the flow in the channels and rivers creates the possibility of a multivariate forecast of channel processes, rivers, and requires minimal expenditures. The purpose of the study is to determine the main objectives and directions of research in the area under consideration. A mathematical model and a computer program have been developed that allow solving a wide range of tasks for modelling currents in the channels of various difficulties, taking into account daily regulation. This makes it possible to identify and proactively take measures, such as: determining the time to reach the flow along the channel; the establishment of water volume flow in an arbitrary channel; taking emergency measures to regulate the incoming residual volume of water after its termination into the system, in the event of an accident at pumping stations; identification of the nature and direction of channel processes; prevention of undermining of supports and damage to power lines passing through the channel, and many other engineering tasks. The developed tested mathematical model allows in real conditions and in real time to help the operational services of large channels in the operational management of actions, in emergency situations, and the choice of the most effective, at any point in time, measures to minimize the consequences. Analysis of the results of many researchers has created the opportunity for the authors of this article to conclude that the above system of hydrodynamic equations is applicable in mathematical modelling of motion, taking into account the transverse circulation of the flow.
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3

Nikora, Vladimir I., Victor B. Sapozhnikov, and David A. Noever. "Fractal geometry of individual river channels and its computer simulation." Water Resources Research 29, no. 10 (October 1993): 3561–68. http://dx.doi.org/10.1029/93wr00978.

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4

Viseur, Sophie. "Turbidite reservoir characterization : object-based stochastic simulation meandering channels." Bulletin de la Société Géologique de France 175, no. 1 (January 1, 2004): 11–20. http://dx.doi.org/10.2113/175.1.11.

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Abstract Stochastic imaging has become an important tool for risk assessment and has successfully been applied to oil field management. This procedure aims at generating several possible and equiprobable 3D models of subsurface structures that enhance the available data set. Among these stochastic simulation techniques, object-based approaches consist of defining and distributing objects reproducing underground geobodies. A technical challenge still remains in object-based simulation. Due to advances in deep water drilling technology, new hydrocarbon exploration has been opened along the Atlantic margins. In these turbidite oil fields, segments of meandering channels can be observed on high-resolution seismic horizons. However, no present object-based simulation technique can reproduce exactly such known segments of channel. An improved object-based approach is proposed to simulate meandering turbidite channels conditioned on well observations and such seismic data. The only approaches dealing with meandering channels are process-based as opposed to structure-imitating. They are based on the reproduction of continental river evolution through time. Unfortunately, such process-based approaches cannot be used for stochastic imaging as they are based on equations reflecting meandering river processes and not turbiditic phenomena. Moreover, they incoporate neither shape constraints (such as channel dimensions and sinuosity) nor location constraints, such as well data. Last, these methods generally require hydraulic parameters that are not available from oil field study. The proposed approach aims at stochastically generating meandering channels with specified geometry that can be constrained to pass through well-observations. The method relies on the definition of geometrical parameters that characterize the shape of the expected channels such as dimensions, directions and sinuosity. The meandering channel object is modelled via a flexible parametric shape. The object is defined by a polygonal center-line (called backbone) that supports several sections. Channel sinuosity and local channel profiles are controlled by the backbone and, respectively the sections. Channel generation is performed within a 2D domain, D representing the channel-belt area. The proposed approach proceeds in two main steps. The first step consists in generating a channel center-line (C) defined by an equation v=Z(u) within the domain D. The geometry of this line is simulated using a geostatistical simulation technique that allows the generation of controlled but irregular center-lines conditioned on data points. During the second step, a vector field enabling the curve (C) to be transformed into a meandering curve (C’) is estimated. This vector field acts as a transform that specifies the third degree of channel sinuosity, in other words, the meandering parts of the loops. This field is parameterized by geometrical parameters such as curvature and tangent vectors along the curve (C) and the a priori maximum amplitude of the meander loops of the curve (C’). To make channel objects pass through conditioning points, adjustment vectors are computed at these locations and are interpolated along the curves. Synthetic datasets have been built to check if a priori parameters such as tortuosity are reproduced, and if the simulations are equiprobable. From this dataset, hundred simulations have been generated and enable one to verify that these two conditions are satisfied. Equiprobability is however not always satisfied from data points that are very close and located in a multivalued part of a meander : preferential orientation of the loops may indeed be observed. Solving this issue will be the focus of future works. Nevertheless, the results presented in this paper show that the approach provides satisfying simulations in any other configurations. This approach is moreover well-suited for petroleum reservoir characterization because it only needs specification of geometrical parameters such as dimension and sinuosity that can be inferred from the channel parts seen on seismic horizons or analogues.
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He, Fei, Qiuying Lai, Jie Ma, Geng Wei, and Weixin Li. "Numerical Simulations of Sudden Oil Spills in Typical Cross-Border Rivers in the Yangtze River Delta Region." Applied Sciences 12, no. 24 (December 19, 2022): 13029. http://dx.doi.org/10.3390/app122413029.

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The Taipu River is an important cross-border river in the Yangtze River Delta region and a direct channel connecting Taihu Lake and Huangpu River. Along the main stream of the Taipu River are many sources of water, such as the Wujiang, Dingzha, and Liantang Rivers. Many boats traverse these rivers transporting a wide variety of goods, including large quantities of oil, chemicals, and other dangerous goods. In the event of accidents on these vessels, spilled cargo will directly threaten the drinking water safety of people in the region. Aiming at simulating and assessing the environmental risks of sudden oil spills in rivers in the Yangtze River Delta region, this paper established a two-dimensional oil spill model of the typical transboundary Taipu River based on the MIKE21 water environment numerical simulation software developed by the Danish Institute of Water Conservancy. The established model will improve emergency response and treatment plans as well as our understanding of river oil spill progressions.
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6

Magomedova, M. R., Z. A. Kurbanova, and B. A. Shangereeva. "COMPUTER SIMULATION OF DETERMINING SILTATION VOLUMES OF WATER RESERVOIR STORAGE ON THE AKSAY RIVER." Herald of Dagestan State Technical University. Technical Sciences 46, no. 4 (January 2, 2020): 102–12. http://dx.doi.org/10.21822/2073-6185-2019-46-4-102-112.

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Objectives. The development of a mathematical model for the increased turbidity zones of the Aksay river in order to determine the siltation volumes of the Aksay water reservoir storage.Method. The mathematical model is developed using the theory of probability and the theory of random process outliers. The model takes the normal distribution of the horizontal and vertical components of the instantaneous flow velocities into account, as well as the Rayleigh law of the distribution of their maxima. The proposed model is used to calculate the “turbidity tail” of the Aksay river.Result. Due to the multifactorial nature of the continuously associated processes of siltation and deposition of suspended and bottom sediments in the upper pounds of the Aksay reservoir storage hydrological system, a mathematical model of the reservoir accretion process is developed. This model provides the reliability of accretion forecasting with spatial and temporal correlation with the siltation process model, which is actually feasible on the basis of computer simulation.Conclusion. The developed model, which is based on a probabilistic approach and the theory of random process outliers, reflects the overall process of sediment transport in open channels. The development and execution of simulation programmes is carried out using the Microsoft Developer Studio (MDS) and the Fortran Power Station algorithmic language, which comprises not only a programming system, but also a set of tools for supporting large software projects integrated into MDS.
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7

NASSAR, M. A. "ONE-DIMENSIONAL HYDRODYNAMIC MODEL SIMULATING WATER STAGE IN OPEN CHANNELS (WS-1)." International Journal of Modeling, Simulation, and Scientific Computing 01, no. 02 (June 2010): 303–16. http://dx.doi.org/10.1142/s1793962310000110.

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One-dimensional (1D) numerical model was developed to simulate water stage in open channels in order to suggest solutions for practical problems in the Nile River and its branches. The continuity and momentum equations describe the unsteady flow were solved using the finite difference technique. The developed model is verified using two types of data. The first type, simulating steady flow, is a field data collected at Elbogdady reach. It is a reach located 712.80 km upstream of Roda's staff gauge on the Nile River. The second type, simulating unsteady flow, is a result of the 1D SOBEK model. It is simulating the flow field at El-Mahrousa canal. It is one of El-Kanobia canal branches at 11.47 km left side, which is fed from El-Mahmoudia canal. Simplifications were made to simulate the flow patterns around the hydraulic structures using the developed hydrodynamic model. Actually, the water levels in many branch canals under continuous flow after implementation of Irrigation Improvement Project (IIP) need to be checked. The model could be applied to estimate the water stage under different abstraction values where some reaches of the Nile River and its branch suffering. In addition, it can be used to assess the impact of water allocation. Good agreement was observed between the model results and the field observations.
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8

Ages, Alard, and Anne Woollard. "Tracking a Pollutant in the Lower Fraser River: A Computer Simulation." Water Quality Research Journal 23, no. 1 (February 1, 1988): 122–40. http://dx.doi.org/10.2166/wqrj.1988.010.

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Abstract A one-dimensional numerical model of the tidal portion of the Fraser estuary has been adapted to simulate the path and residence time of contaminants released in any of the lower reaches of the river. A brief discussion of the model’s original development and purpose is followed by an assessment of its accuracy in predicting currents as compared to water surface elevations. Since the flow computations in this type of model are vertically and laterally integrated, they had to be corrected to represent transport in mid-channel. These correction factors were established by several time series and spot measurements along the river, taking into account the local topography. The results were verified by tracking surface floats during three representative discharges.
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9

Zhang, Weifeng G., John L. Wilkin, and Oscar M. E. Schofield. "Simulation of Water Age and Residence Time in New York Bight." Journal of Physical Oceanography 40, no. 5 (May 1, 2010): 965–82. http://dx.doi.org/10.1175/2009jpo4249.1.

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Abstract The time scales on which river inflows disperse in the coastal ocean are relevant to a host of biogeochemical and environmental processes. These time scales are examined in a modeling study of the Hudson River plume on its entry to the New York Bight (NYB). Constituent-oriented age and residence-time theory is applied to compute two time scales: mean age, which is calculated from the ratio of two model tracers, and residence time, which is calculated using the adjoint of the tracer conservation equation. Spatial and temporal variability associated with river discharge and wind is investigated. High river discharge lowers surface water age and shortens residence time in the apex of the NYB. Easterly winds increase surface water age and extend the duration waters along the Long Island coast remain in the NYB apex. Southerly winds increase age along the New Jersey coast but drive a decrease in age of offshore surface waters and prolong the time that surface waters close to the New Jersey coast stay in the NYB apex. Residence time along the Long Island coast is high in spring and summer because of the retention of water north of the Hudson shelf valley. Patterns of modeled surface water age and an age proxy computed from the ratio of satellite-measured irradiance in two channels show qualitative agreement. A least squares fit gives a statistically significant empirical relationship between the band ratio and modeled mean age for NYB waters.
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10

Zinoviev, A. T., A. V. Dyachenko, K. B. Koshelev, and K. V. Marusin. "Modeling of channel processes in large rivers with the use of field data." EURASIAN JOURNAL OF MATHEMATICAL AND COMPUTER APPLICATIONS 9, no. 1 (2021): 87–102. http://dx.doi.org/10.32523/2306-6172-2021-9-1-87-102.

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The paper deals with mathematical description of channel processes occurring in long sections of large rivers with a complex morphometry. To forecast negative manifestations of channel deformations, a computer model of river sediment transport in the study section is proposed. It is based on a three-dimensional (3D) / two-dimensional horizontal (2DH) flow model, a 2DH model of bed sediment transport and observation data. Comparative analysis of simulation results of channel processes in the Ob river section at the Barnaul water intakes and in situ data makes it possible to evaluate forecast capabilities of the designed model, in particular, for quantitative assessment of changes in channel topography of the study section caused by natural and anthropogenic impacts.
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Дисертації з теми "River channels Computer simulation"

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Hoyles, Matthew, and Matthew Hoyles@anu edu au. "Computer Simulation of Biological Ion Channels." The Australian National University. Theoretical Physics, 2000. http://thesis.anu.edu.au./public/adt-ANU20010702.135814.

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This thesis describes a project in which algorithms are developed for the rapid and accurate solution of Poisson's equation in the presence of a dielectric boundary and multiple point charges. These algorithms are then used to perform Brownian dynamics simulations on realistic models of biological ion channels. An iterative method of solution, in which the dielectric boundary is tiled with variable sized surface charge sectors, provides the flexibility to deal with arbitrarily shaped boundaries, but is too slow to perform Brownian dynamics. An analytical solution is derived, which is faster and more accurate, but only works for a toroidal boundary. Finally, a method is developed of pre-calculating solutions to Poisson's equation and storing them in tables. The solution for a particular configuration of ions in the channel can then be assembled by interpolation from the tables and application of the principle of superposition. This algorithm combines the flexibility of the iterative method with greater speed even than the analytical method, and is fast enough that channel conductance can be predicted. The results of simulations for a model single-ion channel, based on the acetylcholine receptor channel, show that the narrow pore through the low dielectric strength medium of the protein creates an energy barrier which restricts the permeation of ions. They further show that this barrier can be removed by dipoles in the neck of the channel, but that the barrier is not removed by shielding by counter-ions. The results of simulations for a model multi-ion channel, based on a bacterial potassium channel, show that the model channel has conductance characteristics similar to those of real potassium channels. Ions appear to move through the model multi-ion channel via rapid transitions between a series of semi-stable states. This observation suggests a possible physical basis for the reaction rate theory of channel conductance, and opens up an avenue for future research.
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Corry, Ben Alexander, and ben corry@anu edu au. "Simulation Studies of Biological Ion Channels." The Australian National University. Research School of Physical Sciences and Engineering, 2003. http://thesis.anu.edu.au./public/adt-ANU20030423.162927.

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Biological ion channels are responsible for, and regulate the communication system in the body. In this thesis I develop, test and apply theoretical models of ion channels, that can relate their structure to their functional properties. Brownian dynamics simulations are introduced, in which the motions of individual ions are simulated as they move through the channel and in baths attached to each end. The techniques for setting boundary conditions which maintain ion concentrations in the baths and provide a driving potential are tested. Provided the bath size is large enough, all boundary conditions studied yield the same results. ¶ Continuum theories of electrolytes have previously been used to study ion permeation. However, I show that these continuum models do not accurately reproduce the physics taking place inside ion channels by directly comparing the results of both equilibrium Poisson-Boltzmann theory, and non-equilibrium Poisson-Nernst-Planck theory to simulations. In both cases spurious shielding effects are found to cancel out forces that play an important role in ion permeation. In particular, the `reaction field' created by the ion entering the narrow channel is underestimated. Attempts to correct these problems by adding extra force terms to account for this reaction field also fail. ¶ A model of the L-type calcium channel is presented and studied using Brownian dynamics simulations and electrostatic calculations. The mechanisms of permeation and selectivity are explained as the result of simple electrostatic interactions between ions and the fixed charges in the protein. The complex conductance properties of the channel, including the current-voltage and current-concentration relationships, the anomalous mole fraction behaviour between sodium and calcium ions, the attenuation of calcium currents by monovalent ions and the effects of mutating glutamate residues, are all reproduced. ¶ Finally, the simulation and electrostatic calculation methods are used to study the gramicidin A channel. It is found that the continuum electrostatic calculations break down in this narrow channel, as the concept of applying a uniform dielectric constant is not accurate in this situation. Thus, the permeation properties of the channel are examined using Brownian dynamics simulations without electrostatic calculations. Future applications and improvements of the Brownian dynamics simulation technique are also described.
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Mahankali, Uma. "Computer Simulation Studies of CLC Chloride Channels and Transporters." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1157115905.

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Song, Hyun Deok. "Computer Simulation Studies of Ion Channels at High Temperatures." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1328890332.

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Lemanski, Michael J. Benton Jesse C. "Simulation for Smartnet scheduling of asynchronous transfer mode virtual channels /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA333481.

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6

Cheung, Priscilla 1980. "Charles River City : an educational augmented reality simulation pocket PC game." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/27096.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2004.
Includes bibliographical references (p. 79).
This thesis has designed and implemented Charles River City, an educational, location-based augmented reality simulation game that uses Pocket PC devices and GPS technology. As mobile devices and processing power become more common and affordable, high school teachers can take advantage of these technological advances to explore new channels for teaching and motivating students. The Charles River City game seeks to engage middle to high school students in learning science in a fun and innovative way. The story and background in the game is loosely based on a previous work called River City, a desktop multi-player virtual simulation game. In Charles River City, students work in teams to investigate the cause of several illnesses in a virtual town. Through interviewing virtual characters, gathering water samples, and analyzing collected data, students learn to think and solve problems as a scientist would. A test run of the game shows that the simulation game is an effective teaching tool that gives students a hands on experience in solving a real world problem that is fun and challenging.
by Priscilla Cheung.
M.Eng.
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7

Kizakkevariath, Sankaranarayanan. "Hydrodynamic analysis and computer simulation applied to ship interaction during maneuvering in shallow channels." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54219.

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A generalized hydrodynamic interaction force model is combined with a ship maneuvering simulator to provide a free-running, closed loop ship simulation capable of trajectory predictions of ships operating in close proximity in a shallow, asymmetric canal. The interaction force model is based on the generalized Lagally's theorem, properly accounting for the orientations and dynamic motions of the ships. Also included are the lift forces and the cross-flow drag forces, which are found to be important for bank suction phenomena. A simplified method is implemented for box shapes, applicable for barge-tows operating in rivers. Results of the calculations are found to be generally in good agreement with experimental and other theoretical results. This work would have utility in studying maneuvers involving ships and barges in close proximity and can be used in training pilots who operate in canals, harbors and rivers, and also in studying the effects of various steering control systems in the early design stages.
Ph. D.
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8

Kafaru, Olutumininu Olufolabomi. "An environment-dependent approach to wideband modelling and computer simulation of UHF mobile radio propagation in built-up areas." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253411.

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Bounhieng, Vilaysane. "INTEGRATED IMPACT ASSESSMENT OF CLIMATE CHANGE ON HYDROLOGY OF THE XEDONE RIVER BASIN, LAO PDR." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/204586.

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Fimbres, Weihs Gustavo Adolfo UNESCO Centre for Membrane Science &amp Technology Faculty of Engineering UNSW. "Numerical simulation studies of mass transfer under steady and unsteady fluid flow in two- and three-dimensional spacer-filled channels." Publisher:University of New South Wales. UNESCO Centre for Membrane Science & Technology, 2008. http://handle.unsw.edu.au/1959.4/41453.

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Hollow fibre and spiral wound membrane (SWM) modules are the most common commercially available membrane modules. The latter dominate especially for RO, NF and UF and are the focus of this study. The main difficulty these types of modules face is concentration polarisation. In SWM modules, the spacer meshes that keep the membrane leaves apart also help reduce the effects of concentration polarisation. The spacer filaments act as flow obstructions, and thus encourage flow destabilisation and increase mass transfer enhancement. One of the detrimental aspects of the use of spacers is an increase of pressure losses in SWM modules. This study analyses the mechanisms that give rise to mass transfer enhancement in narrow spacer-filled channels, and investigates the relationship between flow destabilisation, energy losses and mass transfer. It shows that the regions of high mass transfer on the membrane surface correlate mainly with those regions where the fluid flow is towards the membrane. Based on the insights gained from this analysis, a series of multi-layer spacer designs are proposed and evaluated. In this thesis, a Computational Fluid Dynamics (CFD) model was used to simulate steady and unsteady flows with mass transfer in two- and three-dimensional narrow channels containing spacers. A solute with a Schmidt number of 600 dissolving from the wall and channel Reynolds numbers up to 1683 were considered. A fully-developed concentration profile boundary condition was utilised in order to reduce the computational costs of the simulations. Time averaging and Fourier analysis were performed to gain insight into the dynamics of the different flow regimes encountered, ranging from steady flow to vortex shedding behind the spacer filaments. The relationships between 3D flow effects, vortical flow, pressure drop and mass transfer enhancement were explored. Greater mass transfer enhancement was found for the 3D geometries modelled, when compared with 2D geometries, due to wall shear perpendicular to the bulk flow and streamwise vortices. Form drag was identified as the main component of energy loss for the flow conditions analysed. Implications for the design of improved spacer meshes, such as extra layers of spacer filaments to direct the bulk flow towards the membrane walls, and filament profiles to reduce form drag are discussed.
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Книги з теми "River channels Computer simulation"

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Franz, Delbert D. Full Equations (FEQ) model for the solution of the full, dynamic equations of motion for one-dimensional unsteady flow in open channels and through control structures. Mountain View, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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2

Huval, C. J. Ship navigation simulation study, Southwest Pass Entrance, Mississippi River. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1996.

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3

Olson, Scott A. Simulation of the effects of streambed-management practices on flood levels in Vermont. [Reston, Va.?: U.S. Dept. of the Interior, U.S. Geological Survey, 2000.

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4

Webb, Dennis W. Ship navigation simulation study, southern branch of the Elizabeth River, Norfolk, Virginia. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1995.

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5

Webb, Dennis W. Ship navigation simulation study, southern branch of the Elizabeth River, Gilmerton and Interstate 64 bridges, Norfolk, Virginia. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1995.

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6

Roth, Michelle L. Sample analysis and modeling to determine GPR capability for mapping fluvial mine tailings in the Coeur d'Alene River channel. [Denver, CO]: U.S. Geological Survey, 1996.

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7

Alila, Younes. Effects of pine beetle infestations and treatments on hydrology and geomorphology: Integrating stand-level data and knowledge in mesoscale watershed functions. Victoria, B.C: Pacific Forestry Centre, 2009.

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8

Aral, M. M. A computational method for wave propagation simulation in open channel networks. Atlanta, Ga: Multimedia Environmental Simulations Laboratory, School of Civil and Environmental Engineering, Georgia Institute of Technology, 1996.

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9

Thevenot, Michelle M. Navigation simulation study, mouth of the Colorado River, Matagorda, Texas. Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1997.

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10

Webb, Dennis W. Ship navigation simulation study, Houston-Galveston Navigation Channels, Texas. [Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1995.

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Частини книг з теми "River channels Computer simulation"

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Blanke, Gero. "Simulation of GSM data channels in a safety critical railway environment." In Lecture Notes in Computer Science, 334–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/3-540-57856-0_31.

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Sukhinov, Alexander I., Alexander E. Chistyakov, Alla V. Nikitina, Inna Yu Kuznetsova, Asya M. Atayan, Elena A. Protsenko, and Vladimir N. Litvinov. "Supercomputer-Based Simulation of the Hydrodynamics of River Mouth Areas." In Communications in Computer and Information Science, 255–69. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81691-9_18.

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Veshkurtsev, Yury. "COMPUTER SIMULATION OF THE MODEM." In THE FOUNDATIONS OF THE THEORY OF CONSTRUCTION OF NEW-GENERATION MODEMS, 142–55. au: AUS PUBLISHERS, 2022. http://dx.doi.org/10.26526/chapter_628a89252ca618.76723701.

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The monography presents the fundamentals of the theory of construction new-generation modems. Modems are built on the principles of statistical communication theory, based on the use of a random signal (chaos) as a carrier of information. In such a signal, a characteristic function is modulated, which is a fundamental characteristic of a random process. The signal modulation and demodulation method is patented and allows you to create modems with efficiency and noise immunity indicators several orders of magnitude higher than those of the known devices of the same name. New-generation modems immediately improve the technical characteristics of digital IT equipment by several orders of magnitude, since they work without errors in wired and radio channels when receiving one hundred duodecillion of binary symbols. The book is recommended for scientists and specialists in the field of digital communication systems, statistical radio engineering and instrumentation, and may be useful for graduate students, masters and students of relevant specialties.
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Komarov, Ivan, Sergey Osipov, Andrey Vegera, Darya Kharlamova, and Aleksey Zonov. "Verification of Computer Flow Simulation in Confuser and Diffuser Channels." In Lecture Notes in Mechanical Engineering, 343–52. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9376-2_33.

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Liu, Hao, Wen-Shan Xu, Hong-Xuan Kang, Bao-Shu Yin, and De-Zhou Yang. "Numerical Simulation of the Nutrient Limitation in the Yangtze River Estuary." In Communications in Computer and Information Science, 188–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45283-7_20.

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Wang, Xu, and Ping Yu. "Simulation Research on Water Quality in the Irrigation Section of Jinsha River." In Computer and Computing Technologies in Agriculture X, 354–59. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-06155-5_35.

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Aygun, Okan, Andreja Jonoski, and Ioana Popescu. "Salinity Control on Saigon River Downstream of Dautieng Reservoir Within Multi-objective Simulation-Optimisation Framework for Reservoir Operation." In Lecture Notes in Computer Science, 329–45. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22747-0_26.

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Yaegashi, Yuta, Hidekazu Yoshioka, Koichi Unami, and Masayuki Fujihara. "Numerical Simulation of a Hamilton-Jacobi-Bellman Equation for Optimal Management Strategy of Released Plecoglossus Altivelis in River Systems." In Communications in Computer and Information Science, 91–101. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2158-9_8.

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Premstaller, G., P. Rutschmann, and M. Oberhuber. "Numerical simulation of flow instabilities in steep, stepped channels." In River Flow 2004, 555–61. CRC Press, 2004. http://dx.doi.org/10.1201/b16998-72.

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"Simulation of flow and sediment transport in vegetated channels." In Computational River Dynamics, 375–402. CRC Press, 2007. http://dx.doi.org/10.4324/9780203938485-11.

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Тези доповідей конференцій з теми "River channels Computer simulation"

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Liu, Detian, Xiaofeng Liu, and Xudong Fu. "LES-DEM coupled simulation of sediment particle saltating process in turbulent open channels." In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-22.

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Maojing, Niu. "River Water Quality Monitoring and Simulation Based on WebGIS — Anhui Yinghe River as an Example." In 2016 Sixth International Conference on Instrumentation & Measurement, Computer, Communication and Control (IMCCC). IEEE, 2016. http://dx.doi.org/10.1109/imccc.2016.119.

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Zivkovic, G., and Martin Sommerfeld. "SIMULATION OF PNEUMATIC TRANSPORT IN HORIZONTAL CHANNELS." In Second International Forum on Expert System and Computer Simulation in Energy Engineering. Connecticut: Begellhouse, 1992. http://dx.doi.org/10.1615/ichmt.1992.intforumexpsyscompsimee.500.

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Khan, M., M. Iqbal, and J. Quaicoe. "A Technology Review and Simulation Based Performance Analysis of River Current Turbine Systems." In 2006 Canadian Conference on Electrical and Computer Engineering. IEEE, 2006. http://dx.doi.org/10.1109/ccece.2006.277821.

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You, Kun, Xin Wen, Zhenpeng Liu, and Zhendong Gao. "Simulation of total amount of pollutants into river based on MATLAB software." In 5th International Conference on Computer Information Science and Application Technology (CISAT 2022), edited by Fuming Zhao. SPIE, 2022. http://dx.doi.org/10.1117/12.2656047.

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Gunawardana, Upul, Kim Chi Nguyen, and Ranjith Liyana-Pathirana. "Fast simulation of turbo codes over Rayleigh fading channels." In 2009 6th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON). IEEE, 2009. http://dx.doi.org/10.1109/ecticon.2009.5137168.

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Li, Xiping, Jing Zhang, and Yongyu Song. "Preliminary study on Water Quality Simulation of Hanjiang River Basin - Danjiangkou Reservoir based on MIKE numerical simulation software." In 2022 International Conference on Big Data, Information and Computer Network (BDICN）. IEEE, 2022. http://dx.doi.org/10.1109/bdicn55575.2022.00035.

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Nayak, Deepak Ranjan. "Blind Radial Basis Function Network Equalizer for Digital Communication Channels." In 2009 Third UKSim European Symposium on Computer Modeling and Simulation. IEEE, 2009. http://dx.doi.org/10.1109/ems.2009.51.

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Yu, Dongliang, Ji Wang, Quan Cao, Xinglong Zhang, and Xueguang Liu. "Numerical Simulation of Crude Oil Spreading in a Complex River Channel." In 2020 13th International Pipeline Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ipc2020-9565.

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Анотація:
Abstract Crude oil leaking in rivers may cause serious damages, such as environmental pollution and death of river animals. The crude oil spreading in rivers could be much faster than that on lands, as the leaking crude oil may flow rapidly downstream with the flowing water. Therefore, accurately estimating the transient crude oil spreading area in rivers is a vital task for emergency response and disaster rescue. However, the estimating methods in the literature mainly refer to spreading process in underwater, ocean and soil, which commonly happened in the history. The crude oil transportation pipelines in China pass through many rivers with very complex channel geometries, introducing the necessity of estimating of leaking crude oil spreading in actual river channels. In the current study, the crude oil spreading process along an actual river channel is numerically simulated. The river channel geometry is extracted from a map database, which is further treated using image binarization and edge extraction to obtain the discrete river channel data. The river channel data is then smoothed by picking less data representing main geometric characteristics. The smoothed data is used to reconstruct the river geometry and generate calculation mesh. The mesh is a two-dimensional structured grid with several possible leaking points along the actual crude oil transportation pipeline passing through the river. A multi-fluid MIXTURE model is used to simulate the crude oil spreading process on the water surface, meaning crude oil blending in the flowing water. Cases with a leaking mass flow rate of 240 kg/s and a river flow velocity of 1.58 m/s are simulated for 10 possible leaking sources on the traversing pipeline. The effect of leaking locations and river channel bending on crude oil spreading on river surface were significant according to the simulation results. Sudden widening river channel may result in vortexes and slightly delays the crude oil spreading. The simulated data could be used to make the rescue strategy of crude oil leaking in this specific river.
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Liu, Jun. "Wireless multipath fading channels modeling and simulation based on Sum-of-Sinusoids." In 2016 First IEEE International Conference on Computer Communication and the Internet (ICCCI). IEEE, 2016. http://dx.doi.org/10.1109/cci.2016.7778900.

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Звіти організацій з теми "River channels Computer simulation"

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Shani, Uri, Lynn Dudley, Alon Ben-Gal, Menachem Moshelion, and Yajun Wu. Root Conductance, Root-soil Interface Water Potential, Water and Ion Channel Function, and Tissue Expression Profile as Affected by Environmental Conditions. United States Department of Agriculture, October 2007. http://dx.doi.org/10.32747/2007.7592119.bard.

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Constraints on water resources and the environment necessitate more efficient use of water. The key to efficient management is an understanding of the physical and physiological processes occurring in the soil-root hydraulic continuum.While both soil and plant leaf water potentials are well understood, modeled and measured, the root-soil interface where actual uptake processes occur has not been sufficiently studied. The water potential at the root-soil interface (yᵣₒₒₜ), determined by environmental conditions and by soil and plant hydraulic properties, serves as a boundary value in soil and plant uptake equations. In this work, we propose to 1) refine and implement a method for measuring yᵣₒₒₜ; 2) measure yᵣₒₒₜ, water uptake and root hydraulic conductivity for wild type tomato and Arabidopsis under varied q, K⁺, Na⁺ and Cl⁻ levels in the root zone; 3) verify the role of MIPs and ion channels response to q, K⁺ and Na⁺ levels in Arabidopsis and tomato; 4) study the relationships between yᵣₒₒₜ and root hydraulic conductivity for various crops representing important botanical and agricultural species, under conditions of varying soil types, water contents and salinity; and 5) integrate the above to water uptake term(s) to be implemented in models. We have made significant progress toward establishing the efficacy of the emittensiometer and on the molecular biology studies. We have added an additional method for measuring ψᵣₒₒₜ. High-frequency water application through the water source while the plant emerges and becomes established encourages roots to develop towards and into the water source itself. The yᵣₒₒₜ and yₛₒᵢₗ values reflected wetting and drying processes in the rhizosphere and in the bulk soil. Thus, yᵣₒₒₜ can be manipulated by changing irrigation level and frequency. An important and surprising finding resulting from the current research is the obtained yᵣₒₒₜ value. The yᵣₒₒₜ measured using the three different methods: emittensiometer, micro-tensiometer and MRI imaging in both sunflower, tomato and corn plants fell in the same range and were higher by one to three orders of magnitude from the values of -600 to -15,000 cm suggested in the literature. We have added additional information on the regulation of aquaporins and transporters at the transcript and protein levels, particularly under stress. Our preliminary results show that overexpression of one aquaporin gene in tomato dramatically increases its transpiration level (unpublished results). Based on this information, we started screening mutants for other aquaporin genes. During the feasibility testing year, we identified homozygous mutants for eight aquaporin genes, including six mutants for five of the PIP2 genes. Including the homozygous mutants directly available at the ABRC seed stock center, we now have mutants for 11 of the 19 aquaporin genes of interest. Currently, we are screening mutants for other aquaporin genes and ion transporter genes. Understanding plant water uptake under stress is essential for the further advancement of molecular plant stress tolerance work as well as for efficient use of water in agriculture. Virtually all of Israel’s agriculture and about 40% of US agriculture is made possible by irrigation. Both countries face increasing risk of water shortages as urban requirements grow. Both countries will have to find methods of protecting the soil resource while conserving water resources—goals that appear to be in direct conflict. The climate-plant-soil-water system is nonlinear with many feedback mechanisms. Conceptual plant uptake and growth models and mechanism-based computer-simulation models will be valuable tools in developing irrigation regimes and methods that maximize the efficiency of agricultural water. This proposal will contribute to the development of these models by providing critical information on water extraction by the plant that will result in improved predictions of both water requirements and crop yields. Plant water use and plant response to environmental conditions cannot possibly be understood by using the tools and language of a single scientific discipline. This proposal links the disciplines of soil physics and soil physical chemistry with plant physiology and molecular biology in order to correctly treat and understand the soil-plant interface in terms of integrated comprehension. Results from the project will contribute to a mechanistic understanding of the SPAC and will inspire continued multidisciplinary research.
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