Naslov
Investigation of the Importance of Spatial Resolution for Two-Dimensional Shallow-Water Model Accuracy

Autori
Družeta, Siniša ; Sopta, Luka ; Maćešić, Senka ; Črnjarić-Žic, Nelida

Izvornik
Journal of Hydraulic Engineering - ASCE (0733-9429) 135 (2009), 11; 917-925

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Shallow water; Two-dimensional flow; Two-dimensional models; Mesh generation; Sensitivity analysis; Spatial analysis

Sažetak
The importance of spatial resolution for two-dimensional shallow-water model accuracy has been investigated by testing the effect of mesh refinement on two test cases based on laboratory dam-break experiments. A balanced first-order accurate upwind Q-Scheme and a second-order accurate upwind Hancock Monotone Upstream-centered Scheme for Conservation Laws scheme were both first validated on an analytical test, and then applied to the experimental dam-break test cases on four meshes of different density. Simulation results were evaluated through comparison of experimental and computed water level values at several available gauge points. Model sensitivity analysis showed that (1) mesh density was not critical for results accuracy ; (2) excessive mesh refinement somewhat deteriorated the results ; and (3) optimal spatial resolution was relatively low. Response is shown to be highly complex and no simple relation between spatial resolution and model accuracy has been found.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo, Temeljne tehničke znanosti

POVEZANOST RADA