Performance Assessment of NAMI DANCE in Tsunami Evolution and Currents Using a Benchmark Problem

Velioglu, Deniz
Kian, Rozita
Yalçıner, Ahmet Cevdet
Zaytsev, Andrey
Numerical modeling of tsunami evolution, propagation, and inundation is complicated due to numerous parameters involved in the phenomenon. It is important to assess the performance of numerical codes that solve tsunami motion, as well as flow and velocity patterns. NAMI DANCE is a computational tool developed for the modeling of long waves. It provides numerical modeling and efficient visualization of tsunami generation, propagation, and inundation mechanisms and computes the tsunami parameters. In the theory of long waves, the vertical motion of water particles has no effect on the pressure distribution. Based upon this approximation and neglecting vertical acceleration, the equations of mass conservation and momentum are reduced to two-dimensional depth-averaged equations. NAMI DANCE uses finite difference computational method to solve linear and nonlinear forms of depth-averaged shallow water equations in long wave problems. In this study, NAMI DANCE is applied to a benchmark problem which was discussed in the 2015 National Tsunami Hazard Mitigation Program (NTHMP) annual meeting in Portland, USA. The benchmark problem features a series of experiments in which a single solitary wave propagates up a triangular shaped shelf which has an offshore island feature. The problem provides detailed free surface elevation and velocity time series in the vicinity of the island. The comparison of the results showed that NAMI DANCE is able to satisfactorily predict long wave evolution, propagation, amplification, and tsunami currents.


Long wave runup on piecewise linear topographies
Kanoğlu, Utku (1998-11-10)
We study long-wave evolution and runup on piecewise linear one- and two-dimensional bathymetries analytically and experimentally with the objective of understanding certain coastal effects of tidal waves. We develop a general solution method for determining the amplification factor of different ocean topographies consisting of linearly varying and constant-depth segments to study how spectral distributions evolve over bathymetry, and apply our results to study the evolution of solitary waves. We find asympt...
Numerical simulation of advective Lotka-Volterra systems by discontinuous Galerkin method
Aktaş, Senem; Karasözen, Bülent; Uzunca, Murat; Department of Scientific Computing (2014)
In this thesis, we study numerically advection-diffusion-reaction equations arising from Lotka-Volterra models in river ecosystems characterized by unidirectional flow. We consider two and three species models which include competition, coexistence and extinction depending on the parameters. The one dimensional models are discretized by interior penalty discontinuous Galerkin model in space. For time discretization, fully implicit backward Euler method and semi-implicit IMEX-BDF methods are used. Numerical ...
Critical evolution of hot van der Waals droplets
Kondratyev, VN; Lutz, HO; Ayik, S (1997-05-08)
The dynamical evolution and fragmentation of a hot finite van der Waals system is investigated in a classical molecular dynamics approach. It is demonstrated that, under certain conditions determined mainly by the initial deposited energy, the fragmentation of rare-atom clusters exhibit a critical behavior. This behavior leaves its signatures in the mass distributions and the conditional moments, as well as the scaled factorial moments of the produced fragments. The connection between the observed critical ...
Ground Motion Prediction Equations for the Vertical Ground Motion Component Based on the NGA-W2 Database
Gülerce, Zeynep; Abrahamson, Norman A.; Silva, Walter J. (SAGE Publications, 2017-05-01)
Empirical ground motion models for the vertical component from shallow crustal earthquakes in active tectonic regions are derived using the PEER NGA-West2 database. The model is applicable to magnitudes 3.0-8.0, distances of 0-300 km, and spectral periods of 0-10 s. The model input parameters are the same as used by Abrahamson et al. (2014) except that the nonlinear site response and depth to bedrock effects are evaluated but found to be insignificant. Regional differences in large distance attenuation and ...
Climatic controls on biophysical interactions in the Black Sea under present day conditions and a potential future (A1B) climate scenario
Cannaby, Heather; Fach Salihoğlu, Bettina Andrea; Arkin, Sinan S.; Salihoğlu, Barış (2015-01-01)
A dynamical downscaling approach has been applied to investigate climatic controls on biophysical interactions and lower trophic level dynamics in the Black Sea. Simulations were performed under present day conditions (1980-1999) and a potential future (2080-2099) climate scenario, based on the Intergovernmental Panel for Climate Change A1B greenhouse gas emission scenario. Simulations project a 3.7 degrees C increase in SST, a 25% increase in the stability of the seasonal thermocline and a 37 day increase ...
Citation Formats
D. Velioglu, R. Kian, A. C. Yalçıner, and A. Zaytsev, “Performance Assessment of NAMI DANCE in Tsunami Evolution and Currents Using a Benchmark Problem,” JOURNAL OF MARINE SCIENCE AND ENGINEERING, pp. 0–0, 2016, Accessed: 00, 2020. [Online]. Available: