After a phased buildup of the dam, eigenvalue analysis is used to characterize the eigenfrequencies of the dam-foundation system, with and without fluid reservoir. Response Spectrum Analysis is used to assess the envelopes of displacement and stress amplitudes. Then transient dynamic analysis is performed using either Newmark time integration for an incompressible reservoir or model superposition in time domain using a Hybrid Frequency Time Domain Analysis for compressibility effects in the reservoir.
