skip to Main Content
National Oceanic and Atmospheric Administration Pacific Marine Environmental Laboratory
NOAA Center for Tsunami Research NOAA

The next basic step is checking convergence of the numerical code to a certain asymptotic limit, presumably the actual solution of the equations solved. The grid steps $\Delta x$ and $\Delta y$ need to be halved, and the time step $\Delta t$ reduced appropriately to conform with the Courant-Friedrics-Levy (CFL) criterion. The optimal locations to check convergence are the extreme runup and rundown. A graph needs to be prepared presenting the variation of the calculated runup and rundown (ordinate) with the step size (abscissa). As the step size is reduced, the numerical predictions should be seen to converge to a certain value, and further reductions in step size should not change the results.

Home | Tsunami Forecasting | Hazard Assessment | Research | DART | Events | Info
NOAA   NOAA Center for Tsunami Research   JISAO
US Department of Commerce | NOAA | OAR | PMEL
7600 Sand Point Way NE
Seattle, WA 98115
Contact Us
About | Privacy Policy | Disclaimer