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GroMoPo Metadata for Altar Valley (High Andres) model


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Created: Feb 07, 2023 at 7:26 p.m.
Last updated: Feb 07, 2023 at 7:27 p.m.
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Abstract

Groundwater and surface water sourced from the high Andes of Argentina are highly important for societal, agricultural, and domestic usage in the foothills and valleys, less than hundred kilometers away from the headwaters. Despite their importance, efforts to provide estimates and predictions of surface water and especially groundwater sources and sinks have been limited. During most of the year, precipitation in the high Andes falls primarily as snow, with minimal rainfall over the summer. A widespread lack of measurements and statistical analysis in the region makes it difficult to understand groundwater storage and flow patterns in the Andean watersheds. The contribution of mountain snowmelt to groundwater is a key component of recharge to this area. While this study is limited to a small watershed in the Altar valley of the Central Andes of Argentina, it is representative of most of the Dry Andes region, which runs from Bolivia south to a latitude of 35S between Argentina and Chile. This region is characterized by steep and abrupt topography, highly fractured bedrock, and large fault systems. Here, we investigate the groundwater flow system through observations from pressure transducers and weather stations installed by a mining company exploring the area. We use this data to create a MODFLOW groundwater model of the watershed and develop then a sensitivity analysis to gain insight into the hydrologic system. We explore changes in hydraulic conductivity with depth and reduction in recharge due to uncertainties in sublimation and evaporation and potential future trends. We then analyze heads, surface outflows to assess the impact of these changes within the hydrologic system. In addition, ages distribution in particles from the one well and the river are analyzed. ? This research contributes to the understanding of groundwater recharge and discharge estimates and the hydraulic behavior of upland mountainous watersheds toward better water management in the area.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Argentina
North Latitude
-31.4688°
East Longitude
-70.4677°
South Latitude
-31.4888°
West Longitude
-70.4936°

Content

Additional Metadata

Name Value
DOI
Depth 400
Scale < 10 km²
Layers > 20 layers
Purpose Groundwater resources;Scientific investigation (not related to applied problem)
GroMoPo_ID 105
IsVerified True
Model Code MODFLOW
Model Link https://udspace.udel.edu/handle/19716/29046
Model Time 2013 - 2019
Model Year 2021
Model Authors Rollán, Juan Pablo Domínguez
Model Country Argentina
Data Available Report/paper only
Developer Email https://www.linkedin.com/in/juan-pablo-dominguez-5893b3161/
Dominant Geology Alluvium covering fractured bedrock
Developer Country United States
Publication Title GROUNDWATER MODELING IN THE HIGH ANDES OF ARGENTINA: RESOURCE ASSESSMENT AND POTENTIAL IMPACTS
Original Developer No
Additional Information Groundwater and surface water sourced from the high Andes of Argentina are highly important for societal, agricultural, and domestic usage in the foothills and valleys, less than hundred kilometers away from the headwaters. Despite their importance, efforts to provide estimates and predictions of surface water and especially groundwater sources and sinks have been limited. During most of the year, precipitation in the high Andes falls primarily as snow, with minimal rainfall over the summer. A widespread lack of measurements and statistical analysis in the region makes it difficult to understand groundwater storage and flow patterns in the Andean watersheds. The contribution of mountain snowmelt to groundwater is a key component of recharge to this area. While this study is limited to a small watershed in the Altar valley of the Central Andes of Argentina, it is representative of most of the Dry Andes region, which runs from Bolivia south to a latitude of 35°S between Argentina and Chile. This region is characterized by steep and abrupt topography, highly fractured bedrock, and large fault systems. Here, we investigate the groundwater flow system through observations from pressure transducers and weather stations installed by a mining company exploring the area. We use this data to create a MODFLOW groundwater model of the watershed and develop then a sensitivity analysis to gain insight into the hydrologic system. We explore changes in hydraulic conductivity with depth and reduction in recharge due to uncertainties in sublimation and evaporation and potential future trends. We then analyze heads, surface outflows to assess the impact of these changes within the hydrologic system. In addition, ages distribution in particles from the one well and the river are analyzed. This research contributes to the understanding of groundwater recharge and discharge estimates and the hydraulic behavior of upland mountainous watersheds toward better water management in the area.
Integration or Coupling
Evaluation or Calibration Static water levels
Geologic Data Availability

How to Cite

GroMoPo, S. Ruzzante (2023). GroMoPo Metadata for Altar Valley (High Andres) model, HydroShare, http://www.hydroshare.org/resource/24447df868af454cbb07a3c20c85299b

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/
CC-BY

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