Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Identifying stream-aquifer exchange by temperature gradient in a Guarani Aquifer system outcrop zone

Full text
Author(s):
Edson Cezar Wendland [1] ; Alan Reis [2] ; Jamil Alexandre Ayach Anache [3] ; David Maycon Schimdt Rosa [4] ; Gabriel de Miranda Alcântara [5] ; Christopher Scott Lowry [6] ; Yu-Feng Forrest Lin [7]
Total Authors: 7
Affiliation:
[1] Universidade de São Paulo - Brasil
[2] Universidade de São Paulo - Brasil
[3] Universidade Federal do Mato Grosso do Sul - Brasil
[4] Universidade de São Paulo - Brasil
[5] Universidade de São Paulo - Brasil
[6] University at Buffalo - Estados Unidos
[7] University of Illinois - Estados Unidos
Total Affiliations: 7
Document type: Journal article
Source: RBRH; v. 27, 2022-10-28.
Abstract

ABSTRACT The use of temperature as a natural tracer in hydrology is noticed since the 1960s. In recent years, there has been a revival of the use of this physical property in the investigation of water cycle. The main reasons are the cost reduction of temperature measurements and the development of distributed temperature sensing. Here, we present a study of the groundwater-surface water interaction in the Onça Creek Watershed (Guarani Aquifer System outcrop) using stream discharge data and temperature as a natural tracer. Two Parshall flumes were installed 1.2 km apart to quantify stream discharge and determine groundwater contribution. We used an optic fiber cable to identify interaction locations and a probe with thermistors to measure the vertical temperature gradient and estimate flux rates. The results show a discharge difference of ~250 m3.h-1 between both flumes, which we interpret as baseflow contribution. The distributed temperature sensing allowed the identification of regions with gaining behavior. Discharge rates between 200 and 300 mm.day-1 were determined from vertical temperature measurements, which agrees with the streamflow data. The study demonstrated that temperature is attractive as natural tracer in tropical conditions, where the groundwater temperature is higher than the surface water temperature, especially during the winter. (AU)

FAPESP's process: 15/03806-1 - Water availability and quality threats in a Guarani Aquifer System outcrop zone
Grantee:Edson Cezar Wendland
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants