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ALL GROUNDWATER HYDROLOGY WORK IS (所有的地下水水文工作).pdf

ALL GROUNDWATER HYDROLOGY WORK IS (所有的地下水水文工作).pdf

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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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