| Popis: |
Discharges up to 1700 m 3 /s that lasted 21 days caused extensive erosion of the spillway chute excavated in rock at Tuttle Creek Lake, Kansas. Nearly 300 000 m 3 of shale and limestone were eroded from the unlined chute resulting in a series of escarpments ranging in height from 1.20 to about 8 m. An empirical mathematical model, similar to a US Department of Agriculture model was developed for geologic conditions at Tuttle Creek Lake. This site specific model was used to evaluate the extent of erosion anticipated for future events and, based on this evaluation, to design the spillway repair. The model provides conservative results since it was conceived in such a manner as to over predict erosion. Initial attempts to generalize its use provided questionable results, but similar site specific procedures may be used in other locations for future events. |
