Daily hidrometric and stable isotope database at Quebrada Grande rainforest catchment, Costa Rica


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Created: May 18, 2021 at 12:16 a.m.
Last updated: May 19, 2021 at 4:11 p.m.
DOI: 10.4211/hs.0cdad4c81d2545408e43867d48fedfe9
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Abstract

There is still limited understanding of how waters mix, where waters come from and for how long they reside in tropical catchments. In this study, we used a tracer-aided model (TAM) and a gamma convolution integral model (GM) to assess runoff generation, mixing processes, water ages and transit times (TT) in the pristine humid tropical rainforest Quebrada Grande catchment in central Costa Rica. Models are based on a four-year data record (2016 to 2019) of continuous hydrometric and stable isotope observations. Both models agreed on a young water component of fewer than 95 days in age for 75% of the study period. The streamflow water ages ranged from around two months for wetter years (2017) and up to 9.5 months for drier (2019) years with a better agreement between the GM estimated TTs and TAM water ages for younger waters. Such short TTs and water ages result from high annual rainfall volumes even during drier years with 4,300 mm of annual precipitation (2019) indicating consistent quick near-surface runoff generation with limited mixing of waters and a supra-regional groundwater flow of likely unmeasured older waters. The TAM in addition to the GM allowed simulating streamflow (KGE > 0.78), suggesting an average groundwater contribution of less than 40% to streamflow. The model parameter uncertainty was constrained in calibration using stable water isotopes (δ2H), justifying the higher TAM model parameterization. We conclude that the multi-model analysis provided consistent water age estimates of a young water dominated catchment. This study represents an outlier compared to the globally predominant old water paradox, exhibiting a tropical rainforest catchment with higher new water fractions than older water.

Subject Keywords

Resource Level Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Longitude
-84.0617°
Latitude
10.0941°

Temporal

Start Date:
End Date:

Content

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
International Atomic Energy Agency (IAEA) COS/7/005; RC-19747 (CRP-F31004 and CRP-F31005)
Research Office of Universidad Nacional (Heredia, Costa Rica)
Empresa de Servicios Públicos de Heredia (ESPH)

Contributors

People or Organizations that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.

Name Organization Address Phone Author Identifiers
Costa Rica) Research Office of Universidad Nacional (Heredia Research Office of Universidad Nacional (Heredia, Costa Rica)
Empresa de Servicios Públicos de Heredia (ESPH) Empresa de Servicios Públicos de Heredia (ESPH)

How to Cite

Sánchez-Murillo, R., L. Mayer-Anhalt, C. Birkel, S. Schulz (2021). Daily hidrometric and stable isotope database at Quebrada Grande rainforest catchment, Costa Rica, HydroShare, https://doi.org/10.4211/hs.0cdad4c81d2545408e43867d48fedfe9

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

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

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