Changes in seasonal streamflow extremes experienced in rivers of Northwestern South America (Colombia)

• Autorzy: Pierini J.O. , Restrepo J.C. , Aguirre J. , Bustamante A.M. , Velásquez G.J.
• Języki publikacji: EN

Abstrakty

EN

A measure of the variability in seasonal extreme streamflow was estimated for the Colombian Caribbean coast, using monthly time series of freshwater discharge from ten watersheds. The aim was to detect modifications in the streamflow monthly distribution, seasonal trends, variance and extreme monthly values. A 20-year length time moving window, with 1-year successive shiftments, was applied to the monthly series to analyze the seasonal variability of streamflow. The seasonal-windowed data were statistically fitted through the Gamma distribution function. Scale and shape parameters were computed using the Maximum Likelihood Estimation (MLE) and the bootstrap method for 1000 resample. A trend analysis was performed for each windowed-serie, allowing to detect the window of maximum absolute values for trends. Significant temporal shifts in seasonal streamflow distribution and quantiles (QT), were obtained for different frequencies. Wet and dry extremes periods increased significantly in the last decades. Such increase did not occur simultaneously through the region. Some locations exhibited continuous increases only at minimum QT.

Słowa kluczowe

EN

discharge; time series analysis; streamflow; trend; extreme analysis

PL

rozładowanie; analiza szeregów czasowych; strumień; trend

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2017
• Tom: Vol. 65, no. 2
• Strony: 377--394
• Opis fizyczny: Bibliogr. 52 poz.

Twórcy

autor

Pierini J.O.

• Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (IADO, CONICET, UNS), Bahía Blanca, Argentina

autor

Restrepo J.C.

• Grupo de Investigación en Geociencias, Departamento de Física, Universidad del Norte, Barranquilla, Colombia

autor

Aguirre J.

• Grupo de Investigaciones Ambientales GIA, Escuela de Ingenierías, Universidad Pontificia Bolivariana, Medellín, Colombia

autor

Bustamante A.M.

• Grupo de Investigaciones Ambientales GIA, Escuela de Ingenierías, Universidad Pontificia Bolivariana, Medellín, Colombia

autor

Velásquez G.J.

• Grupo de Investigaciones Ambientales GIA, Escuela de Ingenierías, Universidad Pontificia Bolivariana, Medellín, Colombia

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