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Unformatted text preview: sing the turning band method (Tompson et al., 1989).
Step 2: we simulate seawater intrusion with the SWIM2D module for this first lnK field.
Step 3: we increase the heterogeneity of lnK by incrementing σln(K) while maintaining the
other parameters constant. Step 4: we simulate seawater intrusion using the lnK field from
step 3. Steps 3 and 4 are then iterated.
Since the numerical difficulty increases as σlnK increases, we use a logarithmic function
to control the σlnK increment: σi
ln(i + 1)
σ N ln( N + 1) (5) where σi is the standard deviation of the ith lnK field, N is the number of increments, σN is
the standard deviation of the objective (final) standard deviation. Other incremental
functions have been tested; the logarithmic increment proved to be the most efficient.
Fig. 1(a) shows the values of σlnK for 10 continuation steps (final value σlnK = 4.0). The
results are analysed in Fig. 1(b), in terms of error norm vs iteration number. The root-meansquare norm of δH is used, where δH is the head variation over tw...
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This document was uploaded on 01/19/2014.
- Winter '14
- The Land, In French