Hydrodynamics of Time Periodic Groundwater Flow

The goal of this volume is to present a clear and accessible mathematical introduction to the basic and advanced theory of time-periodic groundwater flow, which is essential for developing a comprehensive knowledge of groundwater hydraulics ...

Hydrodynamics of Time Periodic Groundwater Flow

Author: Joe S. Depner

Publisher: John Wiley & Sons

ISBN: 1119133947

Page: 324

View: 935

Hydrodynamics of Time-Periodic Groundwater Flow introduces the emerging topic of periodic fluctuations in groundwater. While classical hydrology has often focused on steady flow conditions, many systems display periodic behavior due to tidal, seasonal, annual, and human influences. Describing and quantifying subsurface hydraulic responses to these influences may be challenging to those who are unfamiliar with periodically forced groundwater systems. The goal of this volume is to present a clear and accessible mathematical introduction to the basic and advanced theory of time-periodic groundwater flow, which is essential for developing a comprehensive knowledge of groundwater hydraulics and groundwater hydrology. Volume highlights include: Overview of time-periodic forcing of groundwater systems Definition of the Boundary Value Problem for harmonic systems in space and time Examples of 1-, 2-, and 3-dimensional flow in various media Attenuation, delay, and gradients, stationary points and flow stagnation Wave propagation and energy transport Hydrodynamics of Time-Periodic Groundwater Flow presents numerous examples and exercises to reinforce the essential elements of the theoretical development, and thus is eminently well suited for self-directed study by undergraduate and graduate students. This volume will be a valuable resource for professionals in Earth and environmental sciences who develop groundwater models., including in the fields of groundwater hydrology, soil physics, hydrogeology, geoscience, geophysics, and geochemistry. Time-periodic phenomena are also encountered in fields other than groundwater flow, such as electronics, heat transport, and chemical diffusion. Thus, students and professionals in the field of chemistry, electronic engineering, and physics will also find this book useful.

Selected Water Resources Abstracts

Plots were made of substrate loss versus time and of solution absorbance (
biomass ) at 525 nm versus time . ... Groundwater pollution , * Capillary water , *
Microorganisms , Biodegradation , Differential equations , Advection ,
Hydrodynamics , Nutrients , Biofilms . ... The effects of time - periodic inlet
contaminant concentration and groundwater flow velocity on contaminant
transport in a single , planar ...

Selected Water Resources Abstracts

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Twenty Second Symposium on Naval Hydrodynamics

20 Green water and respective motions (hw=2.975 m, Ȧ=1.527 rad/sec, ȕ=30°
and Fn=0.287). ... is that, as it is in the real situation, the amount of water flowing
at the deck is varying with time as a result of waves action and ship motions. ...
Steep and large waves are represented by periodic, 2nd-order Stokes waves.

Twenty Second Symposium on Naval Hydrodynamics

Author: National Research Council

Publisher: National Academies Press

ISBN: 9780309184533

Page: 1038

View: 791

The Twenty-Second Symposium on Naval Hydrodynamics was held in Washington, D.C., from August 9-14, 1998. It coincided with the 100th anniversary of the David Taylor Model Basin. This international symposium was organized jointly by the Office of Naval Research (Mechanics and Energy Conversion S&T Division), the National Research Council (Naval Studies Board), and the Naval Surface Warfare Center, Carderock Division (David Taylor Model Basin). This biennial symposium promotes the technical exchange of naval research developments of common interest to all the countries of the world. The forum encourages both formal and informal discussion of the presented papers, and the occasion provides an opportunity for direct communication between international peers.

Hydrodynamics of Ship Propellers

We can then think of the blades as low-aspect-ratio wings that rotate and
translate through the water. To describe ... As mentioned in Chapter 13 hull wake
flows vary with time in a non-periodic manner, but lack of knowledge of their
statistical ...

Hydrodynamics of Ship Propellers

Author: John P. Breslin

Publisher: Cambridge University Press

ISBN: 9780521574709

Page: 584

View: 919

Technical introduction to ship propeller hydrodynamics, for researchers in ocean technology, naval architecture, mechanical engineering.

Journal of Hydrodynamics

Available online at www.sciencedirect.com SCIENCE DIREC ECT : IHD B
Journal of Hydrodynamics Ser. ... RATIOS IN THE CROSS - FLOW * QI E - rong
State Key Laboratory of Water Resources and Hydropower Engineering Science
... the transient flow field and the time - averaged flow field and the characteristics
of the vortex structures are analyzed . ... Male , Master , Associate Professor
NUMERICAL SIMULATIONS OF 2D PERIODIC UNSTEADY CAVITATING
FLOWS * WU 334.

Journal of Hydrodynamics

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... path of water flow . 3 - 2 Outline of the Experiment ( A ) K 20 Figure 8 ( A )
Hydrodynamic oscillator with a plastic cup . ... Periodic water flow was observed
even when the pure - water began to go upward for the first time . In other words ,
the ...

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Hydrodynamics of Semi Enclosed Seas

In the long run, the resulting water deficit is compensated by important
exchanges through the strait. ... the first entering near the surface, carrying a flux
of relatively small salinity (Atlantic water) ; the second, outflowing at depth (for it is
... tides which are periodic) and of aperiodic atmospheric factors (local winds and
field of pressure over the Mediterranean). ... and an associated current front are
generated near the sill at about the time of high water and are propagated
towards the East ...

Hydrodynamics of Semi Enclosed Seas

Author: J.C.J. Nihoul

Publisher: Elsevier

ISBN: 9780080870724

Page: 554

View: 739

Hydrodynamics of Semi-Enclosed Seas

Hydrodynamic Propulsion and Its Optimization

A better description is : a propeller is unsteady when the fluid flow relative to its
lifting surface is time dependent while this time dependency is essential for its
functioning . The second part of ... In nature almost all animal propulsion in water
or in air is unsteady , the flapping motion of the tail ... These motions are assumed
to be periodic and are allowed to have a small O ( € ) or a large O ( eo )
amplitude .

Hydrodynamic Propulsion and Its Optimization

Author: J.A. Sparenberg

Publisher: Springer Science & Business Media

ISBN: 9780792332015

Page: 376

View: 494

HYDRODYNAMIC PROPULSION AND ITS OPTIMIZATION ANALYTIC THEORY Hydrodynamic propulsion has been of major interest ever since craft took to the water. In the course of time, many attempts have been made to invent, develop, or to improve hydrodynamic propulsion devices. Remarkable achievements in this field were made essentially by experienced individuals, who were in need of reliable propulsion units such as paddle wheels, sculling devices, screw propellers, and of course, sails. The problem of minimizing the amount of input energy for a prescribed effective output was first investigated seriously at the beginning of this century. In 1919, BETZ presented a paper on air-screw propellers with minimum consumption of energy which could be applied to ship-screw propellers also. Next, attempts were made to optimize hydrodynamic propulsion units. Ensuing investigations concerned the optimization of the hydrodynamic system: ship-propeller. The first simple theory of ship propulsion which was presented considered more or less only thrust augmentation, wake processing and modification of propeller characteristics when operating behind the ships hull. This theory has been little improved meanwhile and is still useful, particularly with regard to practical ship design and for evaluating results of ship model tests. However, this theory is not adequate for optimization procedures necessary for high-technology propulsion, particularly for ship propellers utilizing propulsion improving devices such as tip end plates or tip fins at the propeller blades, spoilers in front of the propeller, asymmetrical stern etc.

Report Hydrodynamics Laboratory Massachusetts Institute of Technology

Early in 1960 an idea was proposed by the senior author for a breakwater , which
would satisfy a number of the above requirements with respect to wave action . ...
This pressure differential induces a flow in the tube out of phase with the normal
wave - induced velocities . Changes with time in this pressure gradient are
periodic in time and are transmitted almost instantaneously , as in any closed
system ...

Report   Hydrodynamics Laboratory  Massachusetts Institute of Technology

Author: Massachusetts Institute of Technology. Hydrodynamics Laboratory

Publisher:

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Physics of Rotating Fluids

Stability of time-periodic flows in a Taylor–Couette geometry Christiane Normand
C.E.A/Saclay, Service de Physique ... on the surface of water in a vertically
vibrating vessel, the waves having half the frequency of the periodic forcing, is
often quoted to illustrate parametric instability [12]. ... various hydrodynamic
systems when one of the parameters of the equilibrium state is subject to periodic
modulation.

Physics of Rotating Fluids

Author: Christoph Egbers

Publisher: Springer Science & Business Media

ISBN: 3540675140

Page: 442

View: 404

This book is devoted to recent developments in the field of rotating fluids, in particular the study of Taylor--Couette flow, spherical Couette flow, planar Couette flow, as well as rotating annulus flow. Besides a comprehensive overview of the current state of the art, possible future directions in this research field are investigated. The first part of this volume presents several new results in the classical Taylor--Couette system covering diverse theoretical, experimental and numerical work on bifurcation theory, influence of boundary conditions, counter-rotating flows, spiral vortices and many others. The second part focuses on spherical Couette flows, including isothermal flows, thermal convective motion, as well as magnetohydrodynamics in spherical shells. The remaining parts are devoted to Goertler vortices, rotating annulus flows, as well as superfluid Couette flows. The present book will be of interest to all researchers and graduate students working actively in the field.

Government Reports Announcements

Fluid Mechanics— Group 20D Descriptors : * Water waves , Numerical analysis ,
Nonlinear systems , Dispersion , Continental ... Descriptors : * Water waves , *
Hydrodynamics , Perturbation theory , Approximation . a cal Descriptors : * Water
waves ... Results from studies of the aerodynamic flow response time at transonic
speeds and measurement of the pressure ... Cambridge Dept of Civil
Engineering THE EVOLUTION OF TIME - PERIODIC LONG WAVES OF FINITE
AMPLITUDE ...

Government Reports Announcements

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Symposium on Naval Hydrodynamics

First , in order to obtain time - accurate solutions a true iteration parameter was
introduced and the use of time for this ... Second , the specifications of the
boundary conditions in the transverse plane required modification from the
previously used symmetry conditions on the waterline and keel . ... If the
upstream flow is axisymmetric ( as in the present application ) , then periodic
boundary conditions are ...

Symposium on Naval Hydrodynamics

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Naval Hydrodynamics Fifteenth Symposium

... the assumptions of irrotational incompressible flow with the velocity potential
derived from a discretized boundary - integral method . ... in the development of
computational models for the nonlinear dynamics of periodic water waves , in the
absence of a floating or submerged body . A semi - Lagrangian time - stepping
procedure introduced by LonguetHiggins and Cokelet ( 1976 ) can be used to
satisfy ...

Naval Hydrodynamics  Fifteenth Symposium

Author:

Publisher: National Academies

ISBN:

Page: 591

View: 363

International Aerospace Abstracts

( Author ) A91-42880 Symmetry - breaking homoclinic chaos and vorticity bursts
in periodic Navier - Stokes flows . ... Nonlinear hydrodynamic stability and
transition ; Proceedings of the IUTAM Symposium , Nice , France , Sept. ... First
observations of an evaporative instability in absorptive dye ( Nigrosin ) doped
water droplets heated by a pulsed Nd ... The existence of time - periodic flow with
an arbitrarily large period which appears under the action of stationary force is
demonstrated .

International Aerospace Abstracts

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The Brahmaputra Basin Water Resources

The river is known for the destruction caused by its periodic changes in its course
from time to time . ... The plan form of the river Brahmaputra reflects the
hydrodynamics of flow within the channel and the associated processes of
sediment ...

The Brahmaputra Basin Water Resources

Author: Vijay Singh

Publisher: Springer Science & Business Media

ISBN: 9781402017377

Page: 613

View: 430

The Brahmaputra River represents nearly 30% of India's water resources potential and 41% of its total hydropower. No sustainable future for this underdeveloped region can occur without a plan combining social, political, economic, cultural, and legal considerations with scientific paradigms. This book pools the talent, knowledge and experience of a wide range of water resource professionals to provide an exhaustive study of the Brahmaputra River basin, present and future.

Current Environmental Engineering Summaries

0002785 Real - time mathematical model for three - dimensional tidal flow and
water quality . ... 0005147 Impact of breakwater removal on hydrodynamics and
water quality in Flushing Bay , New York . ... 0001635 TIME - PERIODIC
ADVECTIONDIFFUSION On the averaging method in nearly time - periodic
advection ...

Current Environmental Engineering Summaries

Author: Engineering Information, Inc

Publisher: Government Inst

ISBN:

Page: 1110

View: 437

Water Quality Engineering in Natural Systems

The tendency of injection wells tobecomeclogged andtheneedfor periodic
maintenance must also beconsidered (Fetter, 1994). ... significantly decrease the
cleanup time by creating steeper hydraulic gradientsand hencegroundwater
flowing at a faster rate to pumping wells. ... This arrangement isolates acirculation
cellwithin the groundwater and is sometimes referred to as hydrodynamic
isolation.

Water Quality Engineering in Natural Systems

Author: David A. Chin

Publisher: John Wiley & Sons

ISBN: 1118459377

Page: 472

View: 863

Provides the tools needed to control and remediate thequality of natural water systems Now in its Second Edition, this acclaimed text sets forthcore concepts and principles that govern the fate and transport ofcontaminants in water, giving environmental and civil engineers andstudents a full set of tools to design systems that effectivelycontrol and remediate the quality of natural waters. Readers willfind coverage of all major classes of water bodies. Moreover, theauthor discusses the terrestrial fate and transport of contaminantsin watersheds, underscoring the link between terrestrial loadingsand water pollution. Water-Quality Engineering in Natural Systems begins withan introduction exploring the sources of water pollution and thecontrol of water pollution. It then presents the fundamentals offate and transport, including the derivation and application of theadvection–diffusion equation. Next, the text covers issuesthat are unique to: Rivers and streams Groundwater Watersheds Lakes and reservoirs Wetlands Oceans and estuaries The final two chapters are dedicated to analyzing water-qualitymeasurements and modeling water quality. This Second Edition is thoroughly updated based on thelatest findings, practices, and standards. In particular, readerswill find new methods for calculating total maximum daily loads forriver contaminants, with specific examples detailing the fate andtransport of bacteria, a pressing problem throughout the world. With end-of-chapter problems and plenty of worked examples,Water-Quality Engineering in Natural Systems enables readersto not only understand what happens to contaminants in water, butalso design systems to protect people from toxic pollutants.