water flow

Known as: flow water 
 
National Institutes of Health

Papers overview

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Highly Cited
2009
Highly Cited
2009
OBJECTIVE The study tested whether a combined environmental and educational intervention solely promoting water consumption was… (More)
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Highly Cited
2006
Highly Cited
2006
We report gas and water flow measurements through microfabricated membranes in which aligned carbon nanotubes with diameters of… (More)
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Highly Cited
2003
Highly Cited
2003
The water channel AQP4 is concentrated in perivascular and subpial membrane domains of brain astrocytes. These membranes form the… (More)
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Highly Cited
2003
Highly Cited
2003
We use molecular dynamics simulations to study osmotically driven transport of water molecules through hexagonally packed carbon… (More)
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Highly Cited
2002
Highly Cited
2002
Interactions between turbulent waters and atmosphere may lead to strong air–water mixing. This experimental study is focused on… (More)
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Highly Cited
2002
Highly Cited
2002
................................................................................................................................................................................. 1 Chapter 1: Introduction .......................................................................................................................................................... 3 Purpose and Scope ....................................................................................................................................................... 4 Development of SEAWAT ........................................................................................................................................... 4 Acknowledgments........................................................................................................................................................ 5 Chapter 2: Mathematical Description of Variable-Density Ground-Water Flow .................................................................. 7 Basic Assumptions....................................................................................................................................................... 7 Concept of Equivalent Freshwater Head ..................................................................................................................... 7 Governing Equation for Ground-Water Flow .............................................................................................................. 9 Darcy’s Law for Variable-Density Ground-Water Flow..............................................................................................11 General Form of Darcy’s Law ...........................................................................................................................11 Assumption of Axes Alignment with Principal Permeability Directions..........................................................12 Darcy’s Law in Terms of Equivalent Freshwater Head .....................................................................................12 Governing Equation for Flow in Terms of Freshwater Head ......................................................................................14 Governing Equation for Solute Transport....................................................................................................................15 Boundary and Initial Conditions..................................................................................................................................15 Dirichlet Boundary.............................................................................................................................................16 Neumann Boundary ...........................................................................................................................................16 Cauchy Boundary...............................................................................................................................................16 Initial Conditions ...............................................................................................................................................17 Sink and Source Terms ................................................................................................................................................17 Concentration and Density...........................................................................................................................................18 Chapter 3: Finite-Difference Approximation for the Variable-Density Ground-Water Flow Equation ................................19 Finite-Difference Approximation for the Flow Equation ............................................................................................19 Construction of System Equations...............................................................................................................................25 Chapter 4: Design and Structure of the SEAWAT Program...................................................................................................27 Temporal Discretization...............................................................................................................................................28 Explicit Coupling of Flow and Transport ....................................................................................................................29 Implicit Coupling of Flow and Transport ....................................................................................................................30 Structure of the SEAWAT Program .............................................................................................................................31 Packages.............................................................................................................................................................33 Array Structure and Memory Allocation ...........................................................................................................33 Chapter 5: Modifications of MODFLOW and MT3DMS.....................................................................................................35 Matrix and Vector Accumulators .................................................................................................................................35 Modifications of the Basic Flow Equation ..................................................................................................................36 Addition of Relative Density-Difference Term .................................................................................................36 Addition of Solute Mass Accumulation Term ...................................................................................................36 Conversion from Volume Conservation to Mass Conservation.........................................................................37 Conversion from Fluid Volume Storage to Fluid Mass Storage ........................................................................37 Conversion between Confined and Unconfined Conditions..............................................................................38 Vertical Flow Calculation for Dewatered Conditions........................................................................................38 Variable-Density Flow for Water-Table Case ....................................................................................................41 Modifications of MODFLOW Stress Packages...........................................................................................................43 Well (WEL) Package .........................................................................................................................................43 River (RIV) Package..........................................................................................................................................44 Drain (DRN) Package ........................................................................................................................................48 Recharge (RCH) Package ..................................................................................................................................50 Evapotranspiration (EVT) Package ...................................................................................................................51 General-Head Boundary (GHB) Package..........................................................................................................53 Time-Varying Constant Head (CHD) Package ..................................................................................................54 Modification of MODFLOW Solver Packages ...........................................................................................................54 MODFLOW-MT3DMS Link Package and Modifications to MT3DMS ....................................................................54 
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Highly Cited
2000
Highly Cited
2000
The variable hydraulic conductivity of roots (Lp(r)) is explained in terms of a composite transport model. It is shown how the… (More)
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Highly Cited
1998
Highly Cited
1998
Understanding water movement through a glacier is fundamental to several critical issues in glaciology, including glacier… (More)
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Highly Cited
1985
Highly Cited
1985
Leaf gas exchange, transpiration, water potential and xylem water flow measurements were used in order to investigate the daily… (More)
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Highly Cited
1984
Highly Cited
1984
COURSE OBJECTIVES: The primary objective of this course is to discuss the principals of finite difference methods and their… (More)
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