and unsaturated soils is based on Darcy's law. Using the fact that for a certain choice
of units of measurement, the gravitational component of the full potential of F is equal
to the height z, to wit F=z
−
p
, we obtain an equation for a homogeneous medium,
known as the equation of motion of moisture:
−
−
=
)
,
z
,
(
)
(
z
)
(
)
(
z
k
k
, (4)
where
- volume of soil moisture, m
3
/m
3
;
I(z,)
- the volume of moisture
released from the unit volume of soil per unit time.
а b
Figura 3. Scheme of multilayer (a – physical, b – mathematical) model of
absorption of moisture and moisture transfer in soils during irrigation
Using the theoretical model of moisture transfer in soils, boundary and initial
conditions, and using the integro – interpolation method, we obtain a system of
differential equations of the dynamics of moisture transfer in soils.
Identification of the parameters of the model (4) and the corresponding difference
model is carried out by experimental studies of wet transfer [5], which are based on the
complex hydrophysical method (I.E. Gernov, M.M. Muromtsev, M.I. Romashchenko
and others). It provides the information needed for the study of water balance and
patterns of moisture movement, as well as for the forecasting and management of water
regime [6]. The method includes laboratory and natural (field) experiments. So, the
coefficient of moisture transfer is calculated according to the calculated formula
(S.S. Kolomiets and others):
- 1317 -