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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Sediment transport and geomorphological adjustment in a high discharge tropical delta (magdalena riv...
Sediment transport and geomorphological adjustment in a high discharge tropical delta (magdalena river, colombia): insights of a period of intense change and human intervention (1990-2010)
Author : JUAN C. RESTREPO(1), KERSTIN SCHROTTKE(2), CAMILLE TRAINI(2), ANDRÉS OREJARENA(3), JUAN C. ORTIZ(1), ALDEMAR HIGGINS(1), LUIS OTERO(1),& LEONARDO MARRIAGA(3)
ver in northwestern South America provides the largest supply of freshwater (205.1 km3 yr-1) and the
greatest amount of suspended sediment (142.6 x106 t yr-1) to the Caribbean Sea. The river mouth has been intervened
since 1930 to allow shipping into the port of Barranquilla. In the last two decades, the watershed also has undergone
severe human interventions. Furthermore, in 2000, a shift in its hydrological patterns appeared. The response of the
Magdalena delta to these stressors remains unclear. Therefore, data of streamflow, suspended sediment and riverbed
dynamics from 1990 to 2000 were analysed in this study to estimate changes in the suspended sediment transport
regime and related processes as well as erosional/depositional patterns in critical zones of the delta. It can be shown,
that the streamflow increased at a higher rate than suspended sediment transport, promoting changes in the sediment
transport regime between the 1990s and the 2000s. These changes led to erosion of the mouth/frontal bar and outlet
zones and modified the erosional/accretionary balance in the prodelta, in the early 2000s. Erosional/sedimentary cycles
were controlled by the magnitude of fluvial discharges and river bed scouring in the river outlet, whilst effluent diffusion
and sediment dispersion were dominants in the delta front. High freshwater discharges, as buoyancy inputs, promoted
the transfer of sediments from the river channel to the outer prodelta through the upper layers of the water column. The
total sediment accumulation in the delta corresponded to <5% of the annual mean SSL of the Magdalena River. In
general, the morphology of the delta remained relatively stable; it experienced a slow progradational state. Higher
sedimentation rates (≤1430 mm yr-1) appeared in the deeper zones.Form Required :
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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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