Sediment transport assessment on river Morava based on 2D hydrodynamic flow model evaluated with Shield’s diagram
2019
Bucek, Daniel | Orfanus, Martin | Dusicka, Peter
Changes in river morphology caused by sediment transport are of major concern when planning a river structure or river restoration project. Insufficient attention to possible morphological development can in long run lead to poor performance of the hydraulic structure or added maintenance cost. It’s even more valid for river restoration projects, where nature is at stake and poorly executed project can even lead to exact opposite of the initial intent, degradation of local habitats. Aim of this thesis is to assess sediment transport conditions of cut off meander labeled DVII on the river Morava for proposed restoration scenario. This cut off meander was chosen due to abundance of data from prior failed restoration project executed in 1996. Lack of knowledge about sediment flow dynamics in the area lead to increase of sediment aggradation and deterioration of local ecosystems. Motion analysis of bedload particles of various grainsizes is carried out using Shields diagram and bed shear stress. Hydrodynamics are computed with the aid of two-dimensional hydrodynamic flow model R2D. Based on this method, we could observe, that a significant aggradation occurs in the inlet channel.
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