| Summary: | 碩士 === 國立成功大學 === 資源工程學系 === 84 === Abstract The geostatistical approaches and soil mechanics
tests in this study are used the investigate the spatial
variability of the water infiltration and soil hydraulic
properties in Lan-Yu repository.The regionalized variable is
defined as the variable of the hydraulic properties. Based on
the theory of the regionalized variability and the semivariogram
approach, both isotropic and anisotropic of the soil hydraulic
properties are studied. Finally, the ordinary and the co-kriging
analyses are used to estimate the estimator and variance of the
soil hydraulic variables. Results indicate that the spatial
variability of the coefficient of permeability, coefficient of
gradation and water infiltration rate is more significant in the
site while that of specific gravity and dry density is less.The
dry density, void ratio and specific gravity are regarded as the
normal distribution.The water infiltration ratio, coefficient of
permeability, effective particle size, uniformity coefficient
and coefficient of gradation are regarded as the lognormal
distribution. Results of geostatistical analysis also show
that the kriging estimation values of the water infiltration
rate on the central area of the site have larger than those on
the side of site, and the major variability is on the
southwestern area,the minor variability is on the northwestern
area. The kriging estimation values coefficient of permeability
K(理想) on the central area of the site have larger than those
on the side of site, and the major variability is on the
southwestern area,the minor variability is on the western area.
The kriging estimation values coefficient of permeability K(G-A)
on the central area of the site have larger than those on the
side of site, and the major variability is on the northern area,
the minor variability is on the northwestern area. The kriging
estimation values of the effective particle size are increased
from northwest to north direction, and the major variability is
on the western area,the minor variability is on the northern
area. The kriging estimation values of the void ratio are
increased from north to south direction, and the major
variability is on the western area,the minor variability is on
the northwestern area. The kriging estimation values of the dry
density are increased from south to north direction, and the
major variability is on the western area,the minor variability
is on the northwestern area. The kriging estimation values of
the specific gravity coefficient in the central area of site
have less values than that in the outside, and the major
variability is on the the northwestern area,the minor
variability is on the western area. The kriging estimation
values of uniformity coefficient in the central area of site
have less values than that in the outside, and the major
variability is on the western area,the minor variability is on
the northwestern. However, the variability of coefficient of
gradation is scattered, and the major variability is on the
western area,the minor variability is on the northern area. The
values of kringing standard deviation of the water infiltration
rate are generally less the value of 1.41(cm/s). In the study,
the kringing standard deviation of the hydraulic properties
except of the coefficient of gradation has the same trend as the
water infiltration rate. Two kriging approaches, the ordinary
kriging and the co-kriging analyses were used to calculate the
local estimation of the mean and the variance of the water
infiltration rate and the coefficient of permeability variables.
The co-kriging estimation had a higer estimation in precision
than ordinary kriging estimation.
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