The latest issue of Dam Engineering (Volume XXXII, Issue 3) has been published.
Looking to the Future
Abstract: As its work drew to a close in 2022, members of the FutureDAMS research team reflected on the lessons they have learned about the water-energy-food-environment nexus since the project first swung into action in 2018.
Application of Wavenumber-TD Approach for Transient Analysis of Concrete Arch Dam-Reservoir Systems
Vahid Lotfi & Gerald Zenz
Abstract: Recently, a variation of the Wavenumber method was proposed which was referred to as Wavenumber-TD approach. The approximation to the original technique improves its realm of application and allows it to be carried out in time domain as well as frequency domain. In that study the formulation was examined for harmonic type of excitation, which proved to be promising. Herein, this will be evaluated for its real intended application, which is transient analysis of concrete arch dam-reservoir systems. For this aim the prepared special purpose finite element program is modified, and the analysis of idealized Morrow Point arch dam is considered as a typical example. Several models are considered with different values of normalized reservoir length. In each case the reservoir truncation surface is treated by Wavenumber-TD, and the extensively utilized Sommerfeld conditions. The dynamic loading considered is the S69E component of Taft earthquake record, applied in the upstream direction. Furthermore, two types of reservoir bottom/sidewalls condition of full reflective, as well as absorptive, are adopted. Overall, this will allow for a thorough examination and evaluation of Wavenumber-TD approach in regard to its effectiveness.
Expanding Reservoirs to Provide Water Security for Communities
Michael F. Rogers
Abstract: The Gross Reservoir Expansion Project in the US will almost triple reservoir storage capacity and improve water reliability for more than 1.5 million Denver residents. Michael F. Rogers, Vice President and Global Dams Practice Leader at Stantec, gives more details.
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