110 research outputs found

    Tracer Advection in an Idealised River Bend with Groynes

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    This paper presents numerical simulations of particle advection in the bend of an open channel containing groynes, which is an idealised form of a shallow river bend in a wide river. The flow field is computed using a boundary-fitted solver of the non-orthogonal, curvilinear shallow water equations. The computational grid is generated by solving Poisson-type elliptic partial differential equations using an iterative multi-grid scheme for prescribed boundary coordinates. The shallow water equations are discretised with finite differences in space, and 4th order Runge-Kutta integration in time. Tracers introduced at specific initial locations have their trajectories computed using Lagrangian particle tracking. The numerical shallow flow model is verified by comparison to the analytical solution of fully developed flow in an open channel. The combined shallow flow and Lagrangian particle-tracking model is then used to simulate the advection of tracer particles in a rectangular channel containing a pair of parallel groynes, and tracer particles in a curved open channel containing groynes, of dimensions roughly equivalent to a Danube River bend

    Neue Erkenntnisse ĂŒber physikalische und ökologische Prozesse an Buhnenfeldern (New insights in the physical and ecological processes in groyne fields)

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    Bericht zum ZweitĂ€gigen Workshop am Umweltforschungszentrum Leipzig-Halle: Stoffdynamik in Buhnenfeldern der Elbe - Erste Ergebnisse (H. Guhr) Feldversuche zu instationĂ€ren Strömungen in Buhnenfeldern mit durchbrochenen und reparierten Buhnen (C. Wirtz & P. Ergenzinger) Approach to groyne innovation in The Netherlands (M. van der Wal) Tracerversuche in Buhnenfeldern - Auswertung einer numerischen Simulation zur Optimierung von Feldversuchen (H.-P. Kozerski & R. Schwartz) Verteilung ausgewĂ€hlter Parameter im Flussquerschnitt (M. Böhme) The effects of groyne shape on the flow in a river (W..J. Uijttewaal) Ergebnisse von physikalischen und numerischen Experimenten an umströmten Buhnenfeldern (V Weitbrecht & C. Hinterberger) Wasserspiegelhebung zufolge nichtĂŒberströmter Buhnen (N. Krouzecky) Vergleich der Ergebnisse von physikalischen Modellversuchen mit der zweidimensionalen tiefengernittelten HN-Modellierung von StrörnungsvorgĂ€ngen an Buhnen (T. Lege & A. Triebel) Morphodynarnische Berechnungen von Sedirnentverteilungen in Buhnenfeldem (M. Krebs) Flow around groynes and pi Ie sheets, Calculations with Delft3D in combination with Horizontal Large Eddy Simulation (HLES) (S. van Schijndel) Ökologische Optirnierung von Buhnen in der Elbe (B. Hentschel & A. Anlauf) Vergleich und Bewertung der planktischen PrimĂ€rproduktion in Hauptstrom und Buhnenfeldern der Elbe (K. Ockenfeld)KWP-collectio
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