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K is a tensor with 9 components. K xx K xy K xz K yx K yy K yz K zx K zy K zz. K =. K xx , K yy, K zz are the principal components of K. q = - K grad h. K xx K xy K xz K yx K yy K yz K zx K zy K zz. q x q y q z. = -. global. local. z. z’. x’. - PowerPoint PPT Presentation
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K =
Kxx Kxy Kxz
Kyx Kyy Kyz
Kzx Kzy Kzz
Kxx ,Kyy, Kzz are the principal components of K
K is a tensor with 9 components
Kxx Kxy Kxz
Kyx Kyy Kyz
Kzx Kzy Kzz
qx
qy
qz
= -
z
h
y
hx
h
q = - K grad h
z
hK
y
hK
x
hKq xzxyxxx
z
hK
y
hK
x
hKq
z
hK
y
hK
x
hKq
z
hK
y
hK
x
hKq
zzzyzxz
yzyyyxy
xzxyxxx
x
z
x’
z’
global local
Kxx Kxy Kxz
Kyx Kyy Kyz
Kzx Kzy Kzz
K’x 0 0
0 K’y 0
0 0 K’z
[K] = [R]-1 [K’] [R]
x
z
x’
z’global local
0x
h
z
hKq xzx
grad h q
z
hKq zzz
)'' ('x
hKq xx
0)'(''
z
hKq zz
Kz’=0
Assume that there is no flow across the bedding planes
z
hK
y
hK
x
hKq
z
hK
y
hK
x
hKq
z
hK
y
hK
x
hKq
zzzyzxz
yzyyyxy
xzxyxxx
0)()()(
z
hK
zy
hK
yx
hK
xzyx
General governing equationfor steady-state, heterogeneous, anisotropic
conditions, without a source/sink term
*)()()( Rz
hK
zy
hK
yx
hK
xzyx
with a source/sink term
*)()()( Rz
hK
zy
hK
yx
hK
xzyx
T
R
y
h
x
h
2
2
2
2
2D horizontal flow; homogeneous and isotropic aquiferwith constant aquifer thickness, b, so that T=Kb.
Poisson Eqn.
x
y
ocean
ocean
R= 0.00305 ft/dT= 10,000 ft2/dayL = 12,000 ft
2L
L
T
R
y
h
x
h
2
2
2
2
C.E. Jacob’s Island Recharge Problem
oceanwell
b
h
ocean ocean
groundwater divide
C.E. Jacob’s Island Recharge Problem
R
x = 0 x = Lx = - L
We can treat this system as a “confined” aquifer if we assume that T= Kb.
datum