VULNERABILITY OF WATER RESOURCES AND TROPHIC STATE OF THE SANTA LUCIA RIVER LOWER BASIN AND ESTUARY...
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VULNERABILITY OF WATER RESOURCES AND TROPHIC STATE OF THE SANTA LUCIA RIVER LOWER BASIN AND ESTUARY TO CLIMATE VARIABILITY AND CHANGE Caffera MR , M Bidegain, F Blixen, CH López, JJ Lagomarsino, GJ Nagy and K Sans Speakers Facultad de Ciencias, UdelaR, Montevideo, Uruguay
VULNERABILITY OF WATER RESOURCES AND TROPHIC STATE OF THE SANTA LUCIA RIVER LOWER BASIN AND ESTUARY TO CLIMATE VARIABILITY AND CHANGE Caffera MR, M Bidegain,
VULNERABILITY OF WATER RESOURCES AND TROPHIC STATE OF THE SANTA
LUCIA RIVER LOWER BASIN AND ESTUARY TO CLIMATE VARIABILITY AND
CHANGE Caffera MR, M Bidegain, F Blixen, CH Lpez, JJ Lagomarsino,
GJ Nagy and K Sans Speakers Facultad de Ciencias, UdelaR,
Montevideo, Uruguay
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THIS CONTRIBUTION DESCRIBES RECENT FINDINGS ON THE
VULNERABILITY OF WATER RESOURCES OF THE SANTA LUCIA RIVER BASIN AND
ESTUARY (SOUTHERN URUGUAY) TO CLIMATE VARIABILITY AND CHANGE. THIS
BASIN SUSTAIN INTENSIVE AGRICULTURE, HOSTS 20,000 Has OF WETLANDS
RICH IN BIODIVERSITY AND SUPPLIES DRINKING WATER FOR 60% OF THE
NATIONS POPULATION. RIVER MOUTH IS AN ESTUARINE SYSTEM. IT IS
LOCATED WITHIN THE BOUNDARIES OF THE ESTUARINE FRONT OF THE RIO DE
LA PLATA WHICH SUPPLIES FRESH OR SALTWATER DEPENDING ON ITS
LOCATION. BECAUSE OF LACK OF KNOWLEDGE ABOUT SOME RELEVANT
PROCESSES WE HAVE FOCUSED ON BUILDING SCIENTIFIC CAPACITY TO
UNDERSTAND BASIC PROCESSES AND FACTS, EMPHASIZING ON ENSO-RELATED
VARIABILLITY
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Monthly average precipitations at Florida, Santa Lucia river
middle basin 1990 - 2003 60,0 70,0 80,0 90,0 100,0 110,0 120,0
130,0 140,0 123456789101112 months mm
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Average temperature and precipitations in Central-southern
Uruguay, Montevideo and Florida (1997 2003), and variation with
regard to normal climatology (1961 1990). Source, DMM. Summer J-F-M
Fall A-M-J Winter J-A-S Spring O-N-D Annual Temperature C
23.218.312.317.417.8 ( C)+0.4+0.8+0.9 +0.7 Precipitations (mm)
3573622432951256 (%)+29+2700+14 Temp. Mv22.218.112.116.417.2 (
C)0+0.8+0.9+0.4+0.5 Precipit. Mv3333602782931263 %)+22+45+6+1+15
Precipit. Fl. (mm) 3863292803731366 Prec. 1990- 2003 1276
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AIACC LA-32 Floods in Santa Luca river at middle and lower
watershed, and embouchure
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AIACC LA32 R11 bridge Middle basin Las Brujas Lower basin
Santiago Vzquez Estuarine zone
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R11 Bridge Station (Middle S ta Luca Basin)
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Santiago Vzquez Station (S ta Luca Estuarine zone)
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R11 bridge Middle basin
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Las Brujas Lower basin
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Estimation of precipitation on March 29, 2002
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A word on extreme events Water vapor low level flux From LA-26:
sensitivity study for major floods in Uruguay river: flood wave ~
12 days In Sta. Luca: ~ 6 days maximum Example: pattern for 15
winter major floods
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Concluding Remarks There is a significative ENSO Signal in the
southernmost watershed of La Plata basin. It seems to be an
increasing amplitude in levels. This could lead to an increase of
ecological stress in freshwater ecology. There is a (recent)
positive trend in the frequency of high levels increasing riverside
vulnerability. Streamflow controls trophic state. In spite of the
economic, environmental and social importance of Sta Luca WB, there
is a considerable lack of data and knowledge.