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A trigger-tube tracer dilution technique for determining darcy and apparent velocities of groundwater in dug wells: A case study on phreatic aquiferous formation in Bamenda-Cameroon

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Journal of Groundwater Science and Engineering 2019年第2期7卷 182-194页

作者： Akoanung Ayaba ABENDONG ENDENE Emmanuel Enoh Jeanot FONGOH AKOACHERE Richard Ayuk II NJENG Napoleon Ngenge Faculty of Science Department of Geology University of Buea Cameroon Civil Engineering Discipline School of Engineering Monash University Malaysia Jalan Lagoon Selatan 47500 Bandar Sunway Selangor Malaysia Ministry of Scientific Research and Innovation Yaoundd-Cameroon

The need to understand flow within aquiferous formations for a complete evaluation of groundwater resource and quality control prompts the determination of groundwater velocities through well dilution technique. Well dilution techniques utilize tracer solutions after establishing an initial homogenous condition to monitor the flow rate of ambient groundwater into the wells. Application of dilution techniques in wells makes it feasible to determine the velocities of groundwater in the aquiferous formation surrounding the well. In this study, a simple trigger-tube tracer dilution technique was employed to determine the darcy and apparent velocities of groundwater in the phreatic aquiferous formation in Bamenda, Cameroon. Eighteen (18) hand dug-wells at different locations within Bamenda were sampled by utilizing sodium chloride (NaCl) as the conservative tracer. Field estimates of groundwater flow velocities in the phreatic aquiferous formation in Bamenda reveal darcy's groundwater velocity in the range of 0.39 m/d at Nacho to 130.64 m/d at Foncha Street and apparent velocity in the range of 0.78 m/d at Nacho to 277.86 m/d at Foncha Street. The immense variations in the velocities of groundwater indicate that the groundwater flows at different rates and directions within the aquiferous formation in Bamenda, possibly due to variations in their hydraulic conductivities. Moreover, the spatial variations in the formation types, facies changes, thickness, and layering of the aquiferous formation also contribute to the variation of velocities. Areas with low groundwater velocities are associated with a lower contaminant transport rate when compared to areas with high groundwater velocities. The findings of this study are important for assessing the rates of pollutant movement in the subsurface, as well as the effectiveness and efficacy of the trigger-tube technique in evaluating the hydraulic properties of aquiferous formations.

关键词： Trigger-tube Groundwater darcy velocity Apparent velocity Bamenda- Cameroon

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Hall Current Effects on Unsteady MHD Flow in a Rotating Parallel Plate Channel Bound-ed by Porous Bed on the Lower Half—darcy Lapwood Model

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Open Journal of Fluid Dynamics 2015年第4期5卷 275-294页

作者： M. Veera Krishna Jagdish Prakash Department of Mathematics Rayalaseema University Kurnool India Department of Mathematics University of Botswana Gaborone Botswana

We discussed the unsteady flow of an incompressible viscous fluid in a rotating parallel plate channel bounded on one side by a porous bed under the influence of a uniform transverse magnetic field taking hall current into account. The perturbations are created by a constant pressure gradient along the plates in addition to the non-torsional oscillations of the upper plate. The flow in the clean fluid region is governed by Navier-Stoke’s equations while in the porous bed the equations are based on darcy-Lapwood model. The exact solutions of velocity in the clean fluid and the porous medium consist of steady state and transient state. The time required for the transient state to decay is evaluated in detail and ultimate quasi-steady state solution has been derived analytically and also its behaviour is computationally discussed with reference to different flow parameters. The shear stresses on the boundaries and the mass flux are also obtained analytically and their behaviour is computationally discussed.

关键词： darcy Lapwood Model Hall Effects MHD Flows Porous Bed Unsteady Flows and Rotating Parallel Plate Channels

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Rayleigh-Taylor Instability of Magnetized Plasma through darcy Porous Medium

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Journal of Modern Physics 2014年第5期5卷 186-197页

作者： Gamal Abdallah Hoshoudy Department of Applied Mathematics and Computer Science Faculty of Science South Valley University Kena Egypt

Effects of horizontal and vertical magnetic field components on the Rayleigh-Taylor instability of stratified incompressible plasmas layer of variable density through darcy porous medium are studied. The basic magnetohydrodynamic (MHD) set of equations has been constructed and linearized. Then the linear normalized growth rate is obtained analytically as a function of the physical parameters of the system considered. Numerical calculations have been performed to see the effects of various parameters on the normalized growth rate of Rayleigh-Taylor instability.(For more information,please refer to the PDF.)

关键词： Rayleigh-Taylor Instability Magnetized Plasmas darcy Porous Media

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Approximate Analytical Solutions for the Nonlinear Brinkman-Forchheimer-Extended darcy Flow Model

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Applied Mathematics 2011年第12期2卷 1432-1436页

作者： Basant K. Jha Muhammad L. Kaurangini 不详

New approximate analytical solutions for steady flow in parallel-plates channels filled with porous materials governed by non-linear Brinkman-Forchheimer extended darcy model for three different physical situations are presented. These results are compared with those obtained from an implicit finite-difference solution of the corresponding time dependent flow problem. It is seen that the time dependent flow solutions yield the almost same steady state values as obtained by using the new approximate analytical

关键词： Non-Linear darcy Time Dependent Flow Steady State

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darcy达美高广告作品欣赏

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声屏世界·广告人 2002年第7期 74-79页

darcy达美高广告是有百年历史的国际广告公司,在全球各大洲都有分支据点。大中国区分公司涵盖香港、台湾、广州、上海、北京等地。达美高擅长打造领导品牌,并树立点子公司的声名,近年来致力创意的提升。(所选作品系北京分公司创作)

关键词：作品欣赏分公司 darcy

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darcy公司推出新型耐久性液压筛管工艺

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石油钻探技术 2016年第2期44卷 105-105页

作者：张好林

darcy公司近期推出的新型耐久性液压筛管工艺突破了传统防砂工艺的部分局限性,形成了新的技术优势,改善了系统的兼容性,有效提高了操作效率和防砂效果,能更好地应对油井出砂。新工艺与传统的防砂工艺相比,适用范围更加广泛,能够有效简... 详细信息

darcy公司近期推出的新型耐久性液压筛管工艺突破了传统防砂工艺的部分局限性,形成了新的技术优势,改善了系统的兼容性,有效提高了操作效率和防砂效果,能更好地应对油井出砂。新工艺与传统的防砂工艺相比,适用范围更加广泛,能够有效简化操作流程,节省作业时间和人工成本。该液压筛管的下入类似于筛管完井,借助传统设备就可以下入井眼。

关键词： darcy 防砂工艺油井出砂防砂效果悬挂器操作效率封隔器技术优势人工成本作业时间

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Brief Comparison between darcy and Mr. Collins' Letters in Pride and Prejudice

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校园英语 2017年第43期 255-255页

作者：金鑫 Xi’an University of Science and Technology College of Humanities and Foreign Language

I will briefly and superficially analyze their difference through a group of examples. I do this job in hope of helping readers understand the author of Pride and Prejudice, Jane Austen’s style and also characters’ ... 详细信息

关键词： darcy Mr.Collins’ Letter Pride and Prejudice

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Analyzing darcy’s Pride and Change from a Naturalistic Point of View

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Journal of Literature and Art Studies 2022年第1期12卷 12-16页

作者： LAI Meng-ying School of Foreign Languages Gannan Normal University

In Pride and Prejudice,darcy’s pride and change are two quite crucial elements that help to move the plot ***,darcy’s pride is more shrouded with a romantic evil that his pride has promoted the interaction between him and Elizabeth and contributed to their mutual *** his change has convinced readers of the infinite power of love and ***’s pride and change had been explained more from a romantic point of view than a realistic *** and Prejudice has been considered as a realistic novel that has exposed the reality of that time by presenting the lives of the middle-class,including their daily interpersonal communication and love *** paper aims to illustrate darcy’s pride and change from a naturalistic point of view by resorting to the basic theory of naturalism.

关键词： pride change darcy naturalism realistic

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The Ideal Husband——Comparison Between darcy and China's Gaofushuai

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青春岁月 2017年第3期 28-28页

作者：鞠申镅上海对外经贸大学

After all the readers,especially those female readers,have read Pride and Prejudice,most of them are immediately hooked by the hero,darcy,who has always been regarded as the ideal ***,in today’s China,there is also a kind of men,Gaofushuai,who represent the Chinese recent criteria of an ideal *** whole essay centers on darcy and *** the usage of Maslow’s Hierarchy of Needs,one of the well-developed theories,we can judge the ideal level of darcy and Gaofushuai:the higher level one can satisfy,the more ideal he is.

关键词： ideal husband darcy Gaofushuai marriage

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Divergence-Free Virtual Element Method for the Stokes Equations with Damping on Polygonal Meshes

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NUMERICAL MATHEMATICS-THEORY METHODS AND APPLICATIONS 2024年第1期17卷 210-242页

作者： Xiong, Yu Chen, Yanping Zhou, Jianwei Liang, Qin Xiangtan Univ Sch Math & Computat Sci Hunan Key Lab Computat & Simulat Sci & Engn Xiangtan 411105 Peoples R China Linyi Univ Sch Math & Stat Linyi 276005 Peoples R China South China Normal Univ Sch Math Sci Guangzhou 510631 Peoples R China

In this paper, we construct, analyze, and numerically validate a family of divergence-free virtual elements for Stokes equations with nonlinear damping on polygonal meshes. The virtual element method is H1-conforming and exact divergence-free. By virtue of these properties and the topological degree argument, we rigorously prove the well-posedness of the proposed discrete scheme. The convergence analysis is carried out, which imply that the error estimate for the velocity in energy norm does not explicitly depend on the pressure. Numerical experiments on various polygonal meshes validate the accuracy of the theoretical analysis and the asymptotic pressure robustness of the proposed scheme.

关键词： Optimal error estimates divergence-free virtual element nonlinear damping term DISCONTINUOUS GALERKIN METHODS EXISTENCE darcy WEAK PROJECTORS

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