A comparison of method of characteristics and Preissmann scheme for flood propagation modeling with 1D Saint-Venant equations
- Authors: Nino Krvavica, Vanja Travaš
- Citation: Acta hydrotechnica, vol. 27, no. 46, pp. 1-12, 2014.
- Abstract: The Saint-Venant equations were integrated by the explicit Method of Characteristics (MOC) and by the implicit Preissmann scheme to comparatively analyze and quantify the differences in prediction of flood wave propagation in open channels. For this purpose a hypothetical scenario was considered by defining a flood wave with a stage hydrograph at the inflow boundary of a prismatic channel. Downstream boundary was defined by a zero-gradient condition. The results are presented as stage hydrographs at equidistant sections along the channel. Comparative analysis revealed some differences between the compared methods. Discrepancies in peak wave heights are more evident in the upstream sections, while the downstream sections are more sensitive to differences in arrival times of flood wave peaks. The explicit MOC predicts lower wave heights and longer arrival times than the implicit Preissmann scheme.
- Keywords: Saint Venant equations, method of characteristics, Preissmann scheme, flood wave propagation
- Full text: a46nt.pdf
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