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ALL GROUNDWATER HYDROLOGY WORK IS (所有的地下水水文工作)
ALL GROUND-WATER HYDROLOGY WORK IS MODELING
A Model is a representation of a system.
ModelingModeling beginsbegins whenwhen oneone formulatesformulates aa conceptconcept ofof aa
hydrologic system,
continues with application of, for example,
Darcys Law or the
Theis equation to the problem,
and may
culminate in a compplex numerical simulation.
MODELS can be used BENEFICIALLY and for DECEPTION
GROUND WATER MODELING
WHY MODEL?
•TTo makke predidictitions abboutt a groundd-watter
system’s response to a stress
•To understand the System
•To design field studies
•Use as a thinking tool
1
Characterize the system
Governing equation of Ground Water Flow:
∂ ⎛ ∂h ⎞ ∂ ⎛ ∂h ⎞ ∂ ⎛ ∂h ⎞ ∂h
⎜⎜ ⎟⎟
KK ++ KK ++ KK −WW SS
⎜⎜ ⎟⎟ ⎜⎜ ⎟⎟ ⎜⎜ ⎟⎟
∂x ⎝ x ∂x ⎠ ∂y ⎝ y ∂y ⎠ ∂z ⎝ z ∂z ⎠ s ∂t
Geometry
Material Properties (K, S, T, Φ , D, R, etc)
e
Boundary Conditions (Head, Flux, Concentration etc)
Stresses (changing boundary conditions)
Boundary Types
infinite Specified Head/Concentration: a special case of constant head (ABC, EFG)
source/sink Constant Head /Concentration: could replace (ABC, EFG)
calculated head Specified
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