Moench’s
solutions for drawdown in fracture and block for different types of
fractureporous media are implemented. Algorithm of DP_LAQ code
(A.F. Moench, 1990) is used for parameter estimation.
See:
Moench
A.F. Doubleporosity models for a
fissured groundwater reservoir with fracture skin // Water
Resources Research. 1984. Vol. 20, N 7. P. 831–846.
Solutions are
available for the following types of the porous media: 1)
slabshaped blocks, 2) sphereshaped blocks; 3) orthogonal fracture
system (model of WarrenRoot).
The figure above shows the slabshaped blocks and the sphereshaped
blocks. The figure below shows the orthogonal fracture
system.
z – distance from
the block center to the fracture; the point in which drawdown is
calculated is specified in the "Offset"
editor.
Unsteadystate
flow equations
1. Drawdown in
fracture (s)
and block (s')
for slabshaped blocks and sphereshaped blocks
2. Drawdown in
the aquifer with orthogonal fracture system
Solutions take
into account storage capacity and skin effect of the pumping well.
For slabshaped blocks and sphereshaped blocks skin effect in the
fracture is additionally accounted for.
The table below
explains notations for Moench’s solutions
Parameter

Explanation


Hydraulic
conductivity of the fracture system , m/day


Hydraulic
conductivity of the block system, m/day


Hydraulic
conductivity of an "average" fracture, m/day


Hydraulic
conductivity of an "average" block, m/day


Specific storage
of the fracture system, 1/m


Specific storage
of the block system, 1/m


Specific storage
of an "average" fracture, 1/m


Specific storage
of an "average" block, 1/m


Volume of the
fracture system, m3


Volume of the
block system, m3


Total volume,
m3

