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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Extreme events, natural variability and climate change : Freshwater discharge into the caribbean sea from the rivers of northwestern south america (colombia)...
Freshwater discharge into the caribbean sea from the rivers of northwestern south america (colombia): magnitude, variability and recent changes
Author : JUAN CAMILO RESTREPO (1), JORGE PIERINI (2), JUAN CARLOS ORT¨ªZ (1), , KERSTIN SCHROTTKE (3), LU¨ªS OTERO (1), JULI¨¢N AGUIRRE (4)
ABSTRACT
Data of monthly averaged freshwater discharge from ten rivers in northern Colombia (Caribbean alluvial plain), draining
into the Caribbean Sea, are analysed to quantify discharge magnitudes, to estimate long-term trends, and to evaluate
the variability of discharge patterns. The rivers deliver ~340.9 km3 yr-1 of freshwater to the Caribbean Sea. The largest
freshwater supply is provided by the Magdalena River with a mean discharge of 205.1 km3 yr-1 at Calamar. This
amounts to 26% of the total fluvial discharge into the Caribbean Sea. From 2000 to 2010, the annual streamflow of
these rivers increased to 65%. Upward trends in statistical significance are found for the Mulatos, Canal del Dique,
Magdalena, and Fundaci¨®n Rivers. The concurrence of major oscillation processes and the maximum power of the 3-7
year band fluctuation define a period of intense hydrological activity from approximately 1998 to 2002. The wavelet
spectrum highlights a change in the variability patterns of fluvial systems between 2000 and 2010, characterised by a
shift towards a quasi-decadal process (8-12 years) domain. The Intertropical Convergence Zone (ITCZ), El Niño -
Southern Oscillation (ENSO) events, and quasi-decadal climate processes are the main factors controlling the fluvial
discharge variability of these fluvial systems.
File Size : 5,713,802 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Extreme events, natural variability and climate change
Date Published : 18/08/2015
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