Guidelines for Calculating and Routing a Dam-Break Flood

摘要

This report described procedures necessary to calculate and route a dam-break flood using an existing generalized unsteady open channel flow model. The recent Teton Dam event was reconstituted to test the model's performance on such a highly dynamic wave. The procedures outlined relate, primarily, to partial breaches. Some deficiencies in the model were identified which will require some further research and programming to improve the applicability of the program to dam-break flood events. The special project memo established four objectives for this study. The first two, (1) level of accuracy of existing techniques and (2) sensitivity of calculated results to n-values and breach size, were summarized and presented in detail in Appendix A. The third objective, (3) description of physical phenomena controlling depth and travel time and a discussion of pertinent field data was presented in the body of this report. The fourth objective, (4) documentation of the methodology, was included in Appendix B. Computer programs utilized in the methodology may be obtained from The Hydrologic Engineering Center. The computer program was applied to the Teton Dam data set to demonstrate the level of accuracy one might expect in such analyses. The results were shown and, in general, appear reasonable. (Author)