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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Influence of the river mouth geometry on the morphological evolution of river mouth bars: importance...
Influence of the river mouth geometry on the morphological evolution of river mouth bars: importance of water intake angle and basin bottom slope
Author : JIMÉNEZ-ROBLES, A. M.(1), ORTEGA-SÁNCHEZ, M.(1) & LOSADA, M. A.(1)
y from rivers to open sea is the fundamental transfer mechanism for continental sedimentation with
implication for many social, economic and ecological activities. Many estuaries in southern Spain are having problems due
to strong sedimentation both at the navigation channel and at the river mouth, forcing to periodic dredging operations to
maintain the inlet depth. Hence it is still necessary to better understand the processes that govern the formation of mouth
bars in front of rivers debouching into the sea, since they play a key role for the delta and coastline configuration. Although
many works during last decades analyzed the effects of factors such as tides, wind waves or sediment properties, the
control that the geometrical configuration of the river mouth exerts on the sedimentary processes remains unclear. In this
work, extensive numerical simulations have been performed using Delft3D, a coupled hydrodynamic and morphodynamic
numerical model, to simulate the processes of river mouth bar formation within a sheltered bay in the absence of tides and
waves. Keeping all other factors constant, we find that varying the water intake angle and the receiving basin bottom
slope, the behaviour of the turbulent jet is modified by changing its direction, spreading rate and stability. This change in
the hydrodynamic conditions has significant consequences in the configuration of the river mouth bar. From the numerical
results we establish a theoretical framework for the specific morphology of the mouth bar as a function of the river outlet
geometry. Hence, our results highlight the importance of this outlet geometry in the morphodynamic evolution of river
mouths and should be considered for properly designing managing strategies.Form Required :
File Size : 5,600,164 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 20/08/2015
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