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Gescilam Uchôa

@gescilam.bsky.social

82 followers 140 following 57 posts

PhD Student at EESC/USP Interested in SW/GW interactions and hyporheic zone. BEng. - UFC MSc. - École Centrale de Lille/EESC https://drive.google.com/file/d/1GxDei0krwHLQmwoqtzRWVe90Rjm214jU/view?usp=sharing

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Gescilam Uchôa @gescilam.bsky.social · 16d

Hi everyone! Excited to share our new paper:
“A groundwater well database for Brazil (GWDBrazil)” published in Scientific Data: www.nature.com/articles/s41...
In partnership with Geological Survey of Brazil

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Gescilam Uchôa @gescilam.bsky.social · 1h

Have a look @ntoniomeiraneto.bsky.social

Reposted by Gescilam Uchôa

AGU Hydrology H3S @agu-h3s.bsky.social · 4h

For the first matchup in Round 2: Headwater catchments, we have Onça vs Jatunhuaycu!

CHECK THIS THREAD for more fun facts about these important catchments, and don’t forget to vote at www.agu-h3s.org/rivercup by 4pm PT TODAY (10/15)

a researcher sitting in a bridge measuring streamflow in the Onça Creek. the creek is clear and flows over a sandy streambed, with wooden erosion control measures in the banks and dense grasses and shrubs on the far bank

a stream in the Jayunhuaycu Experiemmtal Observatory, where the water is turbulent and dark, and the right bank is covered in dense riparian shrubs whereas the left, steeper bank is grassy

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Gescilam Uchôa @gescilam.bsky.social · 2d

3/3 🗓️ Session: H43K – Groundwater–Surface Water Interactions in Mountainous, Riverine, and Coastal Environments III (Poster)

📍 Thursday, 18 Dec 2025 | 2:15–5:45 pm CST

Abstract ID: 1853439

Gescilam Uchôa @gescilam.bsky.social · 2d

2/3 If you’d like to explore new applications, discuss #groundwater–surface #water #interactions, or share ideas on improving #database accessibility, come meet us at #AGU25!

Title: A Groundwater Dataset for Investigating Groundwater–Surface Water Interactions Across #Brazil

Gescilam Uchôa @gescilam.bsky.social · 2d

1/3 We recently published “A Groundwater Well Database for Brazil (GWDBrazil)” in Scientific Data rdcu.be/eKNKh
We also published an application of this database in Nature Communications: “Widespread potential for streamflow leakage across Brazil” rdcu.be/eKNKB

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Reposted by Gescilam Uchôa

AGU Hydrology H3S @agu-h3s.bsky.social · 2d

Welcome back to another round of #CatchmentCup2025! In our final matchups of round 1, eight HUMAN-IMPACTED catchments will compete head to head!

Cast your votes at www.agu-h3s.org/rivercup until TOMORROW (10/14) 5 pm ET, and stay tuned for facts posted throughout the day about these catchments!

River Cup | Agu H3s

www.agu-h3s.org

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Reposted by Gescilam Uchôa

AGU Hydrology H3S @agu-h3s.bsky.social · 5d

Drumroll please.....the winners of round 1's snow-dominated catchments are.....

HUBBARD BROOK, EAST RIVER, BURABAY, and MCMURDO!!!
Some of these matchups were close so keep those votes coming for human-dominated catchments starting next week, 10/13!!!
#CatchmentCup2025

The winners of Round 1 snow-dominated catchments: Hubbard Brook, East River, Burabay, and McMurdo!

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Gescilam Uchôa @gescilam.bsky.social · 6d

5/5 Read the full paper here: ascelibrary.org/doi/10.1061/...

#Hydrogeology #EnvironmentalEngineering #Groundwater #WasteManagement

Assessing Vertical High-Permeability Barriers for Waste Contamination Control: Advective Flow Reduction and Diffusive Transport Challenges in a Sandbox Model | Journal of Environmental Engineering | V...

AbstractLandfill leachate is a source of groundwater contamination, particularly for shallow aquifers. Low-permeability vertical cutoff walls are often used to stop groundwater from flowing into conta...

ascelibrary.org

Gescilam Uchôa @gescilam.bsky.social · 6d

4/5 These findings can guide further research on the feasibility and applicability of high-permeability barriers in waste management.

Next steps: exploring hybrid systems, scalability, and field validation.

Gescilam Uchôa @gescilam.bsky.social · 6d

3/5 Our results show that the barrier can reduce advective flow by 97.98% across the isolated area. However, the backfill material cannot prevent diffusive contaminant transport, which remains a key challenge.

Gescilam Uchôa @gescilam.bsky.social · 6d

2/5 Unlike conventional low-permeability containment barriers (e.g., slurry walls), this barrier serves as a hydraulic control measure, reducing advective flow into a defined region — not blocking it entirely.

Gescilam Uchôa @gescilam.bsky.social · 6d

I’m very happy to have contributed to Ana Guedes’ master’s research, now published in the Journal of Environmental Engineering!

In this study, we investigated a high-permeability vertical barrier for waste isolation using a sandbox experiment, analytical solution, and numerical model.

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Reposted by Gescilam Uchôa

AGU Hydrology H3S @agu-h3s.bsky.social · 10d

The votes are in!!! Check out your Round 1 #CatchmentCup2025 Headwater WINNERS!!! See you tomorrow for the next round for Rain-dominated catchments!

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Gescilam Uchôa @gescilam.bsky.social · 12d

Brazilian Community, let's vote for the Ribeirão da Onça Basin, SP, Brazil.
@ntoniomeiraneto.bsky.social @rodolfonobrega.bsky.social @alinemeyeroliveira.bsky.social

Gescilam Uchôa @gescilam.bsky.social · 12d

Let’s work together to make #groundwater more visible and #integrated into water management in #Brazil.

Gescilam Uchôa @gescilam.bsky.social · 12d

I also invite #researchers & #practitioners to share high-quality data on Brazil’s diverse hydrogeological systems.
Such data is essential for #evidence-based policy & #decision-making in sustainable water management.

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Gescilam Uchôa @gescilam.bsky.social · 12d

In my new Kudos blog, I try to explain, in common language, our new paper: “A groundwater well database for Brazil (#GWDBrazil)” published in Scientific Data.

Read the blog: link.growkudos.com/1pzjabd1yww

#ScienceCommunication #waterscience

A Groundwater Well Database for Investigating Groundwater–Surface Water Interactions Across Brazil

Groundwater provides drinking water to billions of people, supports nearly half of the world’s irrigation, and sustains rivers, wetlands, and other ecosystems. Yet despite its critical role, groundwat...

link.growkudos.com

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Reposted by Gescilam Uchôa

AGU Hydrology H3S @agu-h3s.bsky.social · 13d

We hope that everyone had a happy first day of the 2026 Water Year!

Tomorrow is the first day of Catchment Cup! Check back in the morning when the first round of polling opens up for Headwater Catchments!

We are so excited to share facts and research from early career researchers at these sites!

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Gescilam Uchôa @gescilam.bsky.social · 14d

Thank you for sharing our paper.

Reposted by Gescilam Uchôa

Climate, Ecology, War & More by Dr. Glen Barry, BigEarthData.ai @bigearthdata.bsky.social · 15d

A groundwater well database for Brazil (GWDBrazil)
->Nature | #Groundwater | More from BigEarthData.ai

A groundwater well database for Brazil (GWDBrazil)

The development of our groundwater well database includes five initial steps: data collection, data standardization, quality control, data validation, and data export. These steps are summarized in Fig. 1 and explained in detail in this section. After finalizing the initial...

www.nature.com

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Gescilam Uchôa @gescilam.bsky.social · 15d

We wrote a Behind the Paper blog, where we share our #motivation for building #GWDBrazil and what we hope it will achieve in advancing integrated #waterresourcemanagement.

go.nature.com/46ODaCV

A Groundwater Well Database for Brazil

In collaboration with the Geological Survey of Brazil, we present the GWDBrazil, which consolidates and standardizes information from over 351,000 wells. This dataset is intended to provide essential ...

go.nature.com

Gescilam Uchôa @gescilam.bsky.social · 16d

We hope GWDBrazil becomes a valuable resource for #researchers, #policymakers & #stakeholders. Please share it with anyone interested — and we’d love your feedback to improve and advance data consolidation for water management in Brazil.

Gescilam Uchôa @gescilam.bsky.social · 16d

The database includes ~351,000 #wells across #Brazil
Available in: CSV; Shapefile and NetCDF (for monitoring wells)

Gescilam Uchôa @gescilam.bsky.social · 16d

As a first step, we developed a routine to verify and validate key information from the SGB databases
We also added several new variables designed to assist decision-makers in integrated #water resource management.