Table 1.
Key statistics of pre-settlement (age > 200 y) and post-settlement (age < 200 y) alluvium accumulation rates at timespans between ~40 and 400 y (see also Fig. 4).
| Log timespan bin (Fig. 4) | Approx. time span range (y) | Pre-settlement rates | Pre-settlement study sites | Raw (and Monte Carlo) pre-settlement median rate (mm y−1) | Post-settlement rates | Post-settlement study sites | Raw (and Monte Carlo) post-settlement median rate (mm y−1) | Raw rank sum p value | % of significant Monte Carlo sims. (p value <0.05)a |
|---|---|---|---|---|---|---|---|---|---|
| 1.6 | 40–63 | 7 | 4 | 1.21 (1.81) | 123 | 26 | 15.12 (15.95) | 0.0056 | 90% |
| 1.8 | 63–100 | 30 | 12 | 1.16 (1.17) | 168 | 27 | 23.61 (23.15) | <0.0001 | 100% |
| 2 | 100–158 | 29 | 11 | 0.68 (0.87) | 196 | 45 | 6.40 (8.63) | <0.0001 | 100% |
| 2.2 | 158–250 | 72 | 21 | 0.59 (0.77) | 142 | 34 | 7.66 (7.73) | <0.0001 | 100% |
| 2.4 | 250–400 | 121 | 33 | 0.68 (0.89) | 41 | 18 | 5.7 (5.39) | <0.0001 | 100% |
aThe percentage of Monte Carlo simulations (sims) that yield significant differences between pre- and post-settlement rates (p values <0.05).