Author(s): H. G. Tolossa; J. Tuhtan; M. Schneider; S. Wieprecht
Linked Author(s):
Keywords: Hydrodynamic modelling; Bathymetry; Spatial interpolation; Sensitivityanalysis
Abstract: The use of two dimensional hydrodynamic models has become ubiquitous and indispensable tool for the study of natural rivers. Such models are especially useful when modelling results are required on scales relevant for ecological processes, where local details of velocity and depth distributions are significant – means in river reaches of ecological importance. The objective of this work is to compare two hydrodynamic models with respect to their modelled parameter outputs (water surface elevation, flow depth, velocity, etc.), accuracy, computational time, and their relevance of application for scales of ecological importance. The two models used were Hydro＿ As-2D and SRH-W. Additionally, a sensitivity analysis is performed for the two models to investigate the effects of mesh resolution on model outputs. Three representative case study reaches with different bed morphologies and flow characteristics are selected for the study. The results of the case studies indicated that both Hydro＿As-2D and SRH-W predict the observed water surface elevations quite well. The velocity outputs of the two models are also comparable. The sensitivity analysis shows that SRH-W is more sensitive to mesh resolution than Hydro＿ As-2D.
Year: 2009