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GroMoPo Metadata for Pampa del Tamarugal 2016 regional model


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Created: Feb 07, 2023 at 7:57 p.m.
Last updated: Feb 07, 2023 at 7:57 p.m.
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Abstract

Aquifers within the Pampa del Tamarugal Basin (Atacama Desert, northern Chile) are the sole source of water for the coastal city of Iquique and the economically important mining industry. Despite this, the regional groundwater system remains poorly understood. Although it is widely accepted that aquifer recharge originates as precipitation in the Altiplano and Andean Cordillera to the east, there remains debate on whether recharge is driven primarily by near-surface groundwater flow in response to periodic flood events or by basal groundwater flux through deep-seated basin fractures. In addressing this debate, the present study quantifies spatial and temporal variability in regional-scale groundwater flow paths at 20.5A degrees S latitude by combining a two-dimensional model of groundwater and heat flow with field observations and delta O-18 isotope values in surface water and groundwater. Results suggest that both previously proposed aquifer recharge mechanisms are likely influencing aquifers within the Pampa del Tamarugal Basin; however, each mechanism is operating on different spatial and temporal scales. Storm-driven flood events in the Altiplano readily transmit groundwater to the eastern Pampa del Tamarugal Basin through near-surface groundwater flow on short time scales, e.g., 10(0)-10(1) years, but these effects are likely isolated to aquifers in the eastern third of the basin. In addition, this study illustrates a physical mechanism for groundwater originating in the eastern highlands to recharge aquifers and salars in the western Pampa del Tamarugal Basin over timescales of 10(4)-10(5) years.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Chile
North Latitude
-20.5000°
East Longitude
-68.6000°
South Latitude
-20.5100°
West Longitude
-70.1000°

Content

Additional Metadata

Name Value
DOI 10.1007/s10040-016-1454-3
Depth 5000
Scale Other
Layers
Purpose Scientific investigation (not related to applied problem)
GroMoPo_ID 118
IsVerified True
Model Code 2D vertical transect model
Model Link https://doi.org/10.1007/s10040-016-1454-3
Model Time 1000000 years
Model Year 2016
Model Authors Richard S. Jayne, Ryan M. Pollyea, Justin P. Dodd, Elizabeth J. Olson, Susan K. Swanson
Model Country Chile
Data Available Report/paper only
Developer Email rpollyea@vt.edu
Dominant Geology Model focuses on multiple geologic materials
Developer Country United States
Publication Title Spatial and temporal constraints on regional-scale groundwater flow in the Pampa del Tamarugal Basin, Atacama Desert, Chile
Original Developer No
Additional Information Aquifers within the Pampa del Tamarugal Basin (Atacama Desert, northern Chile) are the sole source of water for the coastal city of Iquique and the economically important mining industry. Despite this, the regional groundwater system remains poorly understood. Although it is widely accepted that aquifer recharge originates as precipitation in the Altiplano and Andean Cordillera to the east, there remains debate on whether recharge is driven primarily by near-surface groundwater flow in response to periodic flood events or by basal groundwater flux through deep-seated basin fractures. In addressing this debate, the present study quantifies spatial and temporal variability in regional-scale groundwater flow paths at 20.5°S latitude by combining a two-dimensional model of groundwater and heat flow with field observations and δ18O isotope values in surface water and groundwater. Results suggest that both previously proposed aquifer recharge mechanisms are likely influencing aquifers within the Pampa del Tamarugal Basin; however, each mechanism is operating on different spatial and temporal scales. Storm-driven flood events in the Altiplano readily transmit groundwater to the eastern Pampa del Tamarugal Basin through near-surface groundwater flow on short time scales, e.g., 100–101 years, but these effects are likely isolated to aquifers in the eastern third of the basin. In addition, this study illustrates a physical mechanism for groundwater originating in the eastern highlands to recharge aquifers and salars in the western Pampa del Tamarugal Basin over timescales of 104–105 years.
Integration or Coupling
Evaluation or Calibration Unsure
Geologic Data Availability

How to Cite

GroMoPo, S. Ruzzante (2023). GroMoPo Metadata for Pampa del Tamarugal 2016 regional model, HydroShare, http://www.hydroshare.org/resource/bc923c69d680404cb80637f6aa565e2e

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

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

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