josé luis arumí & diego rivera water resources department water center for agriculture
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Water availability and quality vulnerability after climate and land-cover changes in an Andean volcanic watershed in south central Chile. José Luis Arumí & Diego Rivera Water Resources Department Water Center for Agriculture University of Concepcion , Chile. Colaborators. - PowerPoint PPT PresentationTRANSCRIPT
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Water availability and quality vulnerability after climate and land-cover changes in an Andean volcanic
watershed in south central Chile
José Luis Arumí & Diego RiveraWater Resources Department Water Center for Agriculture
University of Concepcion, Chile
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Colaborators
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Chile´s Central ValleyPoorly understood Andean hydrology
Economical and social expansion pressure Andean watersheds
Lack of information and understanding regarding ecological services
Potential conflicts between stakeholders
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Climate change impact• Andes Mountain snowmelt
is the main source of water of Central Chile
• Climate Change will Snowmelt will be earlier
• Less snowmelt in late summer and early fall
• More dependency on groundwater base flow
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Diguillin watershed
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Diguillin watershed
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Diguillin watershed
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• The lower part is an important agriculture area.• The upper part is an important tourist area
Diguillin watershed
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Lower part of the watershed uses water for irrigation
• High inversion on agriculture and irrigation– World's highest yield on Sugar
Beat – Blueberry, wheat, corn and
horticultural products• High dependency on water
availability and quality.
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Headwaters
• The Renegado creek : tourism (Sky, trekking and thermal baths )
• The upper Diguillin river: a natural reserve (Hydropower v/s biodiversity)
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The problem: No closure for the water balance
+ Similar hydrological features implies similar hydrology
+ The Upper Diguillin has more water than the Renegado creek. Why?
+ Do similar hydrological features imply similar hydrology?
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Nevados del Chillán ComplexVolcanism controls the hydrology
The upper Diguillin river drains an aquifer inside the volcanic complex Renegado´s hydrogeology comes from recent lava deposits fracture
rock system + thick sandy soils high infiltration
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• Renegado: Highly permeable soils favors infiltration to the fractures and low surface runoff
• Groundwater from the Renegado discharges directly to the Diguillin river.
• Discharge keeps a minimum flow at the river during dry years
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Land cover changeThe Renegado Valley is under a strong pressure for second-housing development
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• The highly permeable soil and the fractured rock system at the Renegado watershed, where there is an important development of tourism and construction of weekend houses, produces questions about the fate of pollutants introduces to the systems by wastewater infiltration from septic tank.
• The pathways between pollutant recharge areas and springs discharge are unknown and most be identified to improve the sustainable develop of the whole watershed.
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• The upper watershed drains to the river
Upper watershed
Lower watershed
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18
Thanks
José Luis Arumí, Diego RiveraWater Resources Department University of Concepcion, Chile