Figure 5-1. Measured data for water-level examples--A, original data; B, original data without dropped sites; C, original data with added sites (added sites indicated with +) (cont)

ETL 1110-1-175
Page Navigation
56

ETL 1110-1-175

30 Jun 97

Figure 5-1. (Sheet 3 of 3)

has an upward concavity that cannot be fit with a

mates should be computed using neighborhoods

linear, spherical, or exponential model. The

with a search radius less than 610 m. In Chapter

observed shape was interpreted as a function of

4, the initial part of the variogram was described

continuous small-scale variability. The Gaussian

as having the most effect on subsequent kriging

model fits the bowl shape of the small lag data

estimates.

(and other data to a lag of about 610 m) well, but

e. The established variogram then was used

it is not flexible enough to closely fit the points

much beyond 610 m, indicating that kriging esti-

with the measured data to produce universal

5-4