Shallow aquifer response to climate change scenarios in a small catchment in the Guarani Aquifer outcrop zone

Melo, Djair Alves de; Wendland, Edson

doi:10.1590/0001-3765201720160264

Cited by 18 publications

(12 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This aquifer is recharged along its more elevated outcrop areas at the eastern and northern borders, and the groundwater tends to flow from north to south, following the axis of the Paraná River Basin (Gastmans, Veroslavsky, Chang, Caetano‐Chang, & Pressinotti, ). Surface water and groundwater relationships in the GAS outcrop zones have been studied with a focus on the recharge quantity in these areas (Wendland, Barreto, & Gomes, ; Wendland, Gomes, & Troeger, ), as well as on estimation of the response of water tables and discharge to rivers to different climate change scenarios (Melo & Wendland, ).…”

Section: Introductionmentioning

confidence: 99%

“…Surface water and groundwater relationships in the GAS outcrop zones have been studied with a focus on the recharge quantity in these areas (Wendland, Barreto, & Gomes, 2007;Wendland, Gomes, & Troeger, 2015), as well as on estimation of the response of water tables and discharge to rivers to different climate change scenarios (Melo & Wendland, 2017).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Groundwater and surface water connectivity within the recharge area of Guarani aquifer system during El Niño 2014–2016

Batista

Gastmans

Sánchez‐Murillo

et al. 2018

Hydrological Processes

View full text Add to dashboard Cite

Recharge areas of the Guarani Aquifer System (GAS) are particularly sensitive and vulnerable to climate variability; therefore, the understanding of infiltration mechanisms for aquifer recharge and surface run‐off generation represent a relevant issue for water resources management in the southeastern portion of the Brazilian territory, particularly in the Jacaré‐Pepira River watershed. The main purpose of this study is to understand the interactions between precipitation, surface water, and groundwater using stable isotopes during the strong 2014–2016 El Niño Southern Oscillation event. The large variation in the isotopic composition of precipitation (from −9.26‰ to +0.02‰ for δ18O and from −63.3‰ to +17.6‰ for δ2H), mainly associated with regional climatic features, was not reflected in the isotopic composition of surface water (from −7.84‰ to −5.83‰ for δ18O and from −49.7‰ to +33.6‰ for δ2H), mainly due to the monthly sampling frequency, and groundwater (from −7.04‰ to −7.76‰ for δ18O and from −49.5‰ to −44.7‰ for δ2H), which exhibited less variation throughout the year. However, variations in deuterium excess (d‐excess) in groundwater and surface water suggest the occurrence of strong secondary evaporation during the infiltration process, corresponding with groundwater level recovery. Similar isotopic composition in groundwater and surface water, as well as the same temporal variations in d‐excess and line‐conditioned excess denote the strong connectivity between these two reservoirs during baseflow recession periods. Isotopic mass balance modelling and hydrograph separation estimate that the groundwater contribution varied between 70% and 80%, however, during peak flows, the isotopic mass balance tends to overestimate the groundwater contribution when compared with the other hydrograph separation methods. Our findings indicate that the application of isotopic mass balance methods for ungauged rivers draining large groundwater reservoirs, such as the GAS outcrop, could provide a powerful tool for hydrological studies in the future, helping in the identification of flow contributions to river discharge draining these areas.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Groundwater and surface water connectivity within the recharge area of Guarani aquifer system during El Niño 2014–2016

Batista

Gastmans

Sánchez‐Murillo

et al. 2018

Hydrological Processes

View full text Add to dashboard Cite

show abstract

“…However, the same is not true under the “pumping” model variant, since in that case the baseflow will markedly decrease under all emission scenarios and time slices, except for the “near future” when such a baseflow decline cannot be detected. Such a great sensitivity of the baseflow to the two pumping variants (and much less to the emission scenario) can be expounded by two important factors: (1) Since the modeled area/Ardabil aquifer is a plain (see Figure 1c) where the groundwater level is close to the land surface, even a slight change of pumping (and less so of climatic) stress can exert a big influence on the groundwater heads (Melo & Wendland, 2017); (2) the groundwater draft from the Ardabil aquifer has dramatically expanded from 35 MCM in 1978 to 160 MCM in 2012, (corresponding to a water height of 150 mm/yr, that is, about 15 times the present‐day total diffuse annual groundwater recharge of 10 mm/yr), thus reversing the current groundwater utilization into the “nonpumping” variant (describing an undisturbed system in which the utilization is satisfied by natural springs only) which will lead to a rise of the groundwater heads and, as a result, to an increased discharge contribution from the groundwater towards the gaining streams, albeit a reduction (by‐12% on average) in the precipitation and an increase in the min and max temperature.…”

Section: Resultsmentioning

confidence: 99%

How Do Gaining and Losing Streams React to the Combined Effects of Climate Change and Pumping in the Gharehsoo River Basin, Iran?

Semiromi

Koch

2020

Water Resources Research

View full text Add to dashboard Cite

Projections of potential impacts of climate change and groundwater abstraction on gaining and losing streams, particularly in ephemeral river basins exhibiting sporadic and intricate flux exchanges, have remained largely unexplored. To fill this gap, we propose a promising modeling scheme based on the new fully integrated hydrological model SWAT-MODFLOW-NWT, calibrated and validated for 1978-2012, to quantify the intertwined surface-groundwater interactions under a conjuncture of three climatic emission scenarios (RCP 2.6, 4.5 and 8.5) and two groundwater pumping variants: "pumping" (extending current groundwater utilization into the future) and "nonpumping" (assuming a complete cease of pumping in the future). By forcing the integrated model with future downscaled climate predictors of CanESM2 under the aforementioned RCPs for three time slices up to year 2100, projections of various water resources components for the Gharehsoo River Basin (GRB), in northwestern Iran were made. Results demonstrate that because of a general decrease of future precipitation, though with ups and downs across the total projection period, most of the surface and-subsurface budget quantities and fluxes are substantially affected. In particular, future groundwater discharge (baseflow) to the gaining streams will be more influenced by the "pumping" variant (increasing and decreasing for "nonpumping" and "pumping", respectively) than the concentrated groundwater recharge from the losing streams (decreasing and increasing for "nonpumping" and "pumping", respectively). Future water yield and groundwater storage will also diminish and, surprisingly, this cannot be alleviated by future "nonpumping", indicating the groundwater overutilization is the compelling reason for the future water scarcity in the GRB, rather than climate change alone. Plain Language Summary Understanding climate change impacts on surface-groundwater interactions, accommodating nearly all of water resources components of a watershed, is of paramount importance in devising effective strategies to alleviate the adverse impacts of climate change. This is particularly important in semiarid regions where the surface water scarcity has markedly increased the dependency on groundwater resources which, in turn, has highly affected the interaction between these two. We have provided an innovative scheme to assess and project climate change impacts on water resources of a basin and, in particularly, on gaining and losing streams at different temporal and spatial scales. In addition, the net impacts of climate change impacts on the quantity of the water resources, compared with the groundwater overutilization, can be quantified using the proposed methodological approach. Our findings importantly highlight that the groundwater overutilization is the major reason, rather than climate change impacts, for extreme groundwater storage depletion in the Gharehsoo River Basin, in northwestern Iran. As a result, groundwater discharge to the river network will diminish tremendously under the...

show abstract

“…Estimates already indicate that, with the current pace of global warming, there will be a significant reduction in the recharge regime of the GAS (Melo and Wendland 2017). As the largest city to use GAS (and source exclusively from this source), Ribeirão Preto, must understand sustainable management and equitable appropriation of water resources as a vital element of its political action.…”

Section: 5mentioning

confidence: 99%

South-American Transboundary Waters: The Management of the Guarani Aquifer System and the La Plata Basin Towards the Future

Espíndola¹,

Leite²,

Ribeiro³

2020

The Palgrave Handbook of Climate Resilient Societies

View full text Add to dashboard Cite

In South America, water is at its heart, underpinning hydropower generation, agricultural production, and industry. Transboundary water bodies cover almost half of South America territory. All countries in the region share transboundary waters, such as aquifers, basins, and rivers that may create enough reason for political conflict among those countries. Therefore, there is a vital need to develop regional strategies to manage those shared water resources, especially with the continuous increase in population growth, climate change, and the increase in demand for water. This chapter takes the La Plata basin and the Guarani Aquifer in South America as a representative example to discuss the management of transboundary water bodies situation and demonstrates how the countries are collaborating to face the challenge to achieve sustainable development on both sides of their borders.

show abstract

Shallow aquifer response to climate change scenarios in a small catchment in the Guarani Aquifer outcrop zone

Cited by 18 publications

References 48 publications

Groundwater and surface water connectivity within the recharge area of Guarani aquifer system during El Niño 2014–2016

Groundwater and surface water connectivity within the recharge area of Guarani aquifer system during El Niño 2014–2016

How Do Gaining and Losing Streams React to the Combined Effects of Climate Change and Pumping in the Gharehsoo River Basin, Iran?

South-American Transboundary Waters: The Management of the Guarani Aquifer System and the La Plata Basin Towards the Future

Contact Info

Product

Resources

About