Interannual variability in the Uruguay river basin

Krepper, Carlos M.; García, Norberto O.; Jones, Phil

doi:10.1002/joc.853

Cited by 43 publications

(29 citation statements)

References 19 publications

(21 reference statements)

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“…The same trend was observed for the Uruguay River after the mid-1960s by Genta et al (1998) and Krepper et al (2003). The streamflow increasing rate can be one of the factors that can contribute to the observed decrease in pink shrimp catches at a rate of 57 tons per year.…”

Section: Interannual Variability and Longer-term Trendssupporting

confidence: 76%

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The Effect of River Discharge and Winds on the Interannual Variability of the Pink Shrimp Farfantepenaeus paulensis Production in Patos Lagoon

Möller

Castello

Vaz

2009

Estuaries and Coasts

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The Patos Lagoon estuary is an important environment for the life cycle of many species, including the pink shrimp Farfantepenaeus paulensis. This area acts as a nursery ground for the shrimp larvae, which are spawned in a coastal area and transported into the lagoon during spring and early summer (September to December). Harvesting of shrimp occurs from January to May, and yields have varied from around 1,000 to 8,000 tons year −1 . This study is based on analysis of river discharge, pink shrimp catches, and wind velocity time series from 1964 to 2004. Negative correlation between pink shrimp catches and river runoff reflects the influence of discharge on the lagoon circulation and, consequently, on the intrusion of salt water and larvae. When river discharge is below average, landward currents forced by SW winds can enhance larval transport into the estuarine area, leading to an increase in pink shrimp captures. Above average river input would force a seaward flow that works as a barrier to ingress of larvae. This is unusual when compared to many other estuarine systems, and the main factor that accounts for this behavior is the morphology (choking) of Patos Lagoon. Interannual variability related to El Niño/Southern Oscillation events also influence pink shrimp production in this area. Low/high shrimp catches are related to El Niño (flood)/La Niña (drought) events. Wind can also impact production through its effect on the southward displacement of larvae from the spawning area. Long-term trends indicate an increase in river discharge around 20 m 3 s −1 year −1 and a decrease in shrimp catches on the order of 57 tons year −1 .

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Section: Interannual Variability and Longer-term Trendssupporting

confidence: 76%

“…These interannual signals were also observed in analysis of the Uruguay River discharge data (Robertson and Mechoso 1998;Krepper et al 2003). This hydrographical basin is adjacent to the PL basin and subject to the same climatic conditions.…”

Section: Interannual Variability and Longer-term Trendsmentioning

confidence: 63%

The Effect of River Discharge and Winds on the Interannual Variability of the Pink Shrimp Farfantepenaeus paulensis Production in Patos Lagoon

Möller

Castello

Vaz

2009

Estuaries and Coasts

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“…Some authors have successfully applied SSA in different river basins of South America (Robertson and Mechoso, 1998;Robertson et al, 2001;Krepper et al, 2003, 2006and Garcia and Mechoso, 2005.…”

Section: Methods Of Analysismentioning

confidence: 99%

“…Berri et al (2002) examined the influence of ENSO on monthly streamflows for the upper Paraná River. Krepper et al (2003) have analysed the interannual variability in rainfall and riverflows on several sub-catchments of the Uruguay River basin. Camilloni and Barros (2003) have studied the relationship between the phases of ENSO and the major discharges of the Paraná River upstream of Corrientes City.…”

Section: Introductionmentioning

confidence: 99%

Low-frequency response of the upper Paraná basin

2007

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ABSTRACT:The low-frequency response of the upper Paraná River basin is investigated by means of singular spectral analysis (SSA) applied to precipitation rates and runoff contributions of different sub-basins, upstream of the Posadas gauging station. The temporal structure of Posadas discharges is characterized by a trend after 1970 and a modulated signal with a period of T ≈ 9 years that produces a maximum in amplitude around 1983. ENSO-range signals (T ≈ 3-5 years) contribute to fit the highest peaks in the streamflow series. Moderate changes in mean annual precipitation rates are reflected in large increases in mean runoff contributions for each subbasin. Changes in relative mean annual runoff responses before and after the 1970s, downstream of Sao Simao, cannot be only explained by increases in the corresponding mean annual precipitation rates. It is more probable that such changes arise as a consequence of some anthropogenic impact than a climatic one. In particular, the outstanding increase in runoff contribution, after 1970, for the drainage area between Itaipú and Jupiá of around 96% is mainly responsible for a positive trend in Paraná flow. From the detailed analysis of each sub-catchment, we can observe that not all the signals present in precipitation are reflected in runoff contributions and vice versa.

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“…The largest discharges were recorded in 1941, 1983and 1997-98 (Nagy et al 1998. Using data from several discharge stations in this basin, and an 11-year moving average, two interannual cycles of 6 and 3.5 years were discriminated (Krepper et al 2003). Harmonic analysis shows a dry period during the 1950-1960 decade, recorded also at the Paraná watershed (Collischonn et al 2001, Krepper et al 2003.…”

Section: The Uruguay River Watershedmentioning

confidence: 99%

ENSO impacts on Atlantic watersheds of South America

Isla

Toldo

2013

ABEQUA

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Interannual changes in precipitation cause significant effects on the Pacific watersheds of South America. Large rivers flowing to the Atlantic Ocean as the Paraná and Uruguay are also influenced by ENSO-triggered floods causing significant impacts on the economies of Argentina, Brazil and Uruguay. At the same time, the floodplains of small rivers are also sensitive to strong ENSOs. Floods occur approximately simultaneously in subtropical watersheds of Brazil and high-latitude watersheds of North Patagonia. ENSO-triggered floods were recorded during the years 1941-42, 1982-83 and 1997-98. Several floods impacted along the Itajaí River affecting the higher (Blumenau city) and lower estuary (Itajaí city). The Guaiba River, at the headlands of Lagoa dos Patos, has repeatedly flooded Porto Alegre. At the Río de la Plata basin, significant increases in the discharges were assigned to the Paraná and the Uruguay rivers. The small basin of the Quequén Grande River without extended floodplains is subject to periodic failure of its margins. The Colorado River, the northern limit of Patagonia, is allochthonous and its watershed was artificial and progressively modified; the ENSO event of 1983 caused an increase in its salinity due to the sudden reactivation of the DesaguaderoCuracó system. Keywords: floods; Atlantic rivers; Argentina; Brazil; Uruguay RESUMENLos cambios interanuales en las precipitaciones causan significativos efectos en las cuencas pacíficas de Sudamérica. Los grandes ríos que fluyen hacia el Océano Atlántico como el Paraná y el Uruguay también son influenciados por estas inundaciones originadas por estos eventos ENSO causando significativos impactos en las economías de Argentina, Brasil y Uruguay. Asimismo, las planicies aluviales de los pequeños ríos también son sensibles a los ENSOs fuertes. Las crecidas ocurren casi simultáneamente en las cuencas subtropicales de Brasil como en las cuencas de altas latitudes de Patagonia. Inundaciones gavilladas por eventos ENSO fueron registradas en los años 1941-42, 1982-83 y 1997-98. Varias inundaciones afectaron al río Itajaí afectando las porciones más altas (Blumenau) y bajas del estuario (Itajaí). El río Guaíba, en las cabeceras de la Lagoa dos Patos, ha repetidamente inundado Porto Alegre. En la cuenca del Río de la Plata, incrementos significativos de su descarga fueron originados por los ríos Paraná y Uruguay. La pequeña cuenca del río Quequén Grande sin grandes planicies aluviales está sujeta a periódicos derrumbes de sus albardones. El río Colorado, límite norte de la Patagonia, es alóctono y su cuenca fue progresiva y artificialmente modificada; el ENSO de 1983 causó un aumento de su salinidad debido a la súbita reactivación del sistema DesaguaderoCuracó.

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Interannual variability in the Uruguay river basin

Cited by 43 publications

References 19 publications

The Effect of River Discharge and Winds on the Interannual Variability of the Pink Shrimp Farfantepenaeus paulensis Production in Patos Lagoon

The Effect of River Discharge and Winds on the Interannual Variability of the Pink Shrimp Farfantepenaeus paulensis Production in Patos Lagoon

Low-frequency response of the upper Paraná basin

ENSO impacts on Atlantic watersheds of South America

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