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Well

A cavity or vessel used to contain liquid.
National Institutes of Health

Papers overview

Semantic Scholar uses AI to extract papers important to this topic.
2015
2015
Safe drinking water is critical to human health and development. In rural sub-Saharan Africa, most improved water sources are… Expand
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2012
2012
PurposeTo elucidate whether the attenuation of hypervascular hepatocellular carcinoma (HCC) on the portal phase of dynamic CT is… Expand
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Review
2012
Review
2012
OBJECTIVE Compare the dermatoscopy vascular features of well differentiated with non-well differentiated squamous cell carcinoma… Expand
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Highly Cited
2011
Highly Cited
2011
OBJECTIVE To investigate whether the histological grade of hepatocellular carcinoma (HCC) can be predicted using the apparent… Expand
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Review
2010
Review
2010
BackgroundThe differences between the metastatic property of moderately (Mod) and well (Wel) differentiated colorectal… Expand
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2006
2006
Poorly differentiated adenocarcinoma (Por) and signet-ring cell carcinoma (Sig) are rare but highly malignant types of colorectal… Expand
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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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Review
2001
Review
2001
Multiaquifer wells, i.e. wells that are open across more than one aquifer, can have a profound effect on the hydraulics of the… Expand
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