Geology, General Agricultural and Biological Sciences
38
Scopus Publications
616
Scholar Citations
14
Scholar h-index
19
Scholar i10-index
Scopus Publications
Decoding surface processes from escarpment to watershed: Insights from karst landscapes using cosmogenic nuclides and geochemical data Rogerio Uagoda, Lionel L. Siame, Jérémie Garnier, Laëtitia Leanni, Dandara Caldeira, Régis Braucher, Rémi Freydier, Patrick Seyler, ASTER Team Geomorphology, 2025 Tropical karst landscapes are marked by complex sediment dynamics resulting from the interplay between geomorphic processes and sediment transport . In the Vermelho Watershed (Brazilian savanna), we use paired cosmogenic nuclides ( 10 Be and 26 Al) to quantify denudation rates, burial durations, and sediment mixing. The spatial distribution of Al Be ratios reveals rapid erosion and prolonged burial on escarpments , in contrast to the more stable conditions of flatter areas, where erosion is subdued, and sediment residence time is longer. Comparisons with Iraquara and Serra das Mesas emphasize the influence of topography and sediment sources on nuclide inventories. Downstream increases in freshly eroded material point to fluvial mixing, while discrepancies between cosmogenic burial and OSL ages (Tarimba Cave) suggest partial burial and pre-depositional histories. The integration of cosmogenic, geochemical, and geomorphic data underscores the complexity of tropical karst systems, where vertical mixing and uneven erosion are key processes. These results contribute to a broader understanding of landscape evolution and offer a comparative basis for interpreting cosmogenic signals in fluvio-karst environments worldwide. • Cosmogenic nuclides reveal sediment mixing and erosion in tropical karst watersheds. • Flatter terrain erodes slowly with long residence, unlike steep escarpment slopes. • Burial age gaps challenge full burial, stressing pre-depositional process roles.
Use of Fluorescent Dye Tracers in the Identification of Groundwater Flow Pathways in Karst Systems: Overview of Studies in Brazil Matheus Santiago Vieira, André Silva Tavares, Rogério Elias Soares Uagoda, Pedro Assunção Revista Brasileira De Geografia Fisica, 2024 O transporte de poluentes por condutos subterrâneos em aquíferos cársticos é uma preocupação crescente, visto que danos ambientais irreversíveis podem ser ocasionados, como a perda da biodiversidade aquática e a contaminação dos recursos hídricos subterrâneos. Para a identificação e avaliação, por exemplo, da origem e destino dos contaminantes e as interações entre fluxos superficiais e subterrâneos (conexões subterrâneas, direção de fluxo), os traçadores corantes fluorescentes, são amplamente usados. Logo, este trabalho teve como objetivo apresentar uma revisão sobre a evolução metodológica do uso de traçadores corantes nos sistemas cársticos e os principais avanços desses estudos no Brasil. Para atingir esse objetivo, foi realizado uma pesquisa bibliográfica sobre a temática contemplando diversos livros, periódicos, teses e dissertações nacionais e internacionais. Para os estudos no Brasil, foram selecionados os periódicos publicados nos últimos 10 anos, disponíveis no Portal Periódicos CAPES, base Web of Science e Google Scholar. Como resultado, foi possível identificar os avanços de novos instrumentos de campo e laboratoriais, softwares de modelagem específicos, e novos traçadores corantes. Para os estudos no Brasil, observou-se um crescimento no número de pesquisas na série histórica explorada, aos quais, possibilitaram uma melhor compreensão do comportamento hidrodinâmico dos sistemas cársticos, como a identificação dos limites cársticos e na identificação e quantificação de contaminantes.Palavras-chave: fluxo subterrâneo, traçadores fluorescentes, contaminação.
Editorial: Near-surface geophysics in Latin American contexts: its applications, education, and societal perspectives as a whole Yawar Hussain, Susanne Maciel, Cristobal Condori, Rogerio Uagoda, Welitom Borges, Martín Cárdenas-Soto, Omar Hamza, Helena Seivane Frontiers in Earth Science, 2024 Moreover, none of the countries in Latin America are exempt from significant earthquake risks, particularly along the Pacific Ring of Fire. Having experienced some of the most powerful earthquakes globally, Chile has demonstrated the severe impact of earthquake-induced liquefaction, one of the most critical hazards to infrastructure. Therefore, incorporating detailed velocity profiles into seismic hazard assessments is crucial for accurately predicting ground motions and mitigating earthquake risks in Chile and other seismically active regions worldwide.Water resource management also remains a pressing issue, especially in vulnerable karst systems and regions with fluctuating soil moisture. Seasonal variations in rainfall directly impact agriculture and flood risks, highlighting the need for effective monitoring tools to ensure sustainability.Near-surface geophysics (NSGeo) is emerging as a vital tool for addressing these challenges. This special issue, "Near-Surface Geophysics in Latin American Contexts: Its Applications, Education, and Societal Perspectives as a Whole," focuses on how NSGeo techniques can be adapted to local conditions to provide practical, non-invasive solutions for environmental hazards and infrastructure needs.The primary aim of this collection is to showcase how NSGeo methods combined with complementary tools like UAVs, geological surveys, and computational modeling are being applied to tackle natural disasters, pollution, and infrastructure risks. The research highlights both the technical advancements and societal impact of these techniques in addressing Latin America's unique challenges.The papers in this special issue are not simply technical studies; they represent a deeper exploration of how geophysics can be used to address pressing concerns in Latin America. Below is a summary of the contributions (accepted and rejected):This study applies GPR technology to the ecological investigation of tree root systems in Brazil. By imaging root structures non-invasively, the authors contribute to the understanding of root biomass and its role in carbon sequestration, emphasizing GPR's potential in advancing ecological and environmental studies. This manuscript presents advancements in spectral analysis techniques to improve the resolution of electrical resistivity tomography (ERT) data. Enhancing data quality increases the accuracy of subsurface investigations, making it a valuable tool for environmental monitoring and geotechnical projects throughout Latin America.The authors introduce a new approach to smoothing ERT data using adaptive filtering techniques. This method improves the clarity and interpretability of resistivity models, enabling more precise imaging of subsurface features, particularly in geologically complex regions.Examining the effects of spatial variability in shear-wave velocity, this manuscript provides critical insights into how such variability influences liquefaction response during earthquakes. The findings from the 2010 Maule earthquake highlight the importance of incorporating detailed velocity profiles into seismic hazard assessments, offering a valuable tool for mitigating earthquake risks in other regions prone to seismic activity.This research integrates UAV digital photogrammetry with seismic refraction tomography to investigate fractured rock beneath a uranium tailings storage dam. The combination of these methods offers a detailed analysis of subsurface fractures, which is essential for assessing the stability of critical infrastructure, particularly in regions where mining activities are prevalent.This manuscript introduces a computationally efficient method for 3D time-domain electromagnetic modeling in anisotropic media. This innovative approach enables more accurate geophysical surveys, contributing to resource exploration and environmental monitoring across Latin America.Landfill Near the Tongo Bassa and Ngongue River, Douala, Cameroon While based in Cameroon, this study's exploration of subsurface pollution mapping using geoelectrical and seismoelectric techniques resonates with environmental challenges seen across Latin America. The integration of these methods provides a detailed understanding of subsurface contamination, with direct applications to waste management and pollution monitoring in Latin American urban centers.The studies in this special issue highlight the diverse applications of near-surface geophysical methods across Latin America. Each paper addresses a unique challenge, whether related to environmental protection, disaster risk reduction, or resource management, demonstrating the value of NSGeo techniques in improving our understanding of subsurface conditions.The integration of advanced computational tools and field techniques with traditional geophysical methods enhances the effectiveness of NSGeo applications. As Latin America continues to face environmental and infrastructural challenges, these techniques will become even more critical for informed decision-making and sustainable development. We hope this collection inspires further research and innovation, fostering collaborations that will lead to continued advancements in near-surface geophysics across the region.
On- and off-site erosion impacts of restoration measures in a tropical karst watershed Maria Rita S. Fonseca, Henrique M. L. Chaves, Rogério E. S. Uagoda Earth Surface Processes and Landforms, 2023 Abstract Karst areas are vulnerable landscapes which, if unprotected, could be permanently degraded. To bridge the gap existing in the reduction of on‐ and off‐site impact of restored tropical karst areas, this study was carried out in a 3.5 ha karst watershed of the Brazilian savanna (Cerrado). Precipitation, surface runoff, and soil loss were measured in representative runoff plots (22.1 × 1.84 m), used to assess the watershed erosion and sediment yield to a downstream sinkhole. The study was carried out during three hydrologic years, between September 2018 and May 2020. The predominant soils in the watershed were Lithic entisol and Quartzsamment, and the original land covers were natural savanna, seasonal forest, and degraded pastureland ( Andropogon gayanus ). The latter was restored with native savanna species, in the lower part of the watershed, and with a reformed pastureland, in the upper part. The USLE rainfall erosivity ( R ), soil erodibility ( K ), and soil cover ( C ) factors, runoff, soil loss, and the original soil and sediment textures were obtained from the runoff plots. The watershed soil loss and sediment yield were obtained by the USLE and GIS. Precipitation and rainfall erosivity ranged from 936 to 1223 mm, and from 6694 to 7746 MJ mm ha −1 h −1 , in the period, respectively. Although the ecological watershed restoration reduced mean soil loss from 11.6 to 5.8 Mg ha −1 year −1 , and sediment yield from 29.2 to 14.6 Mg year −1 , on‐ and off‐site soil loss tolerances were still exceeded in 29 and 61% of the basin area, respectively. Ecological restoration also reduced the sand and clay content of the sediment entering the underground caves and river downstream, contributing to their hydrologic sustainability.
UAV-based doline mapping in Brazilian karst: A cave heritage protection reconnaissance Cristiano Fernandes Ferreira, Yawar Hussain, Rogério Uagoda, Tiago Castro Silva, Rejane Ennes Cicerelli Open Geosciences, 2023 Dolines are depressions in the soluble ground that indicates the degree of karstification. They may also act as connection points (vulnerability spots) between the surface and underground for the transmission of runoff, sediments, and pollutants. The delineation of these spots (dolines) is a crucial step in environmental management through land use planning to protect the karst underground, which is rich in flora and fauna. This requirement can benefit from a cost-effective, accessible, and non-invasion high-resolution investigation generating digital elevation models (DEMs) from unmanned aerial vehicle (UAV) imagery and automated object detection techniques. This study examines the capabilities of UAV-based DEM in detecting dolines across 50 km2 in the environmentally protected area of river Vermelho (APANRV – Área de Proteção Ambiental das Nascentes do Rio Vermelho). Initially, an automatic objects (doline and no-doline) detection algorithm was applied to the DEM, followed by a visual inspection to differentiate doline from possible dolines in orthomosaic photos, topographic profiles, and shaded UAV-based relief (digital terrain model; DTM and DSM). For the redundancy checking, a cluster analysis with four tests was conducted. The objects generated from the best clusters and morphological analysis were gathered in the same base for visual inspection. Out of a total of 933 objects identified, 41% were obtained from the DSM base, 25% from the perimeter-to-area ratio, and 34% through convergence between the two-analyses. Subsequently, the resulting doline typologies are discussed in reference to their proximity to hydrogeological features and their impacts on underground vulnerability. The findings aligned with the previous research as dolines were highly concentrated near sites where carbonates come in contact with siliciclastic sediments.
A SEMI-AUTOMATIC APPROACH FOR DOLINE MAPPING IN BRAZILIAN COVERED KARST: THE WAY FORWARD TO VULNERABILITY ASSESSMENT Cristiano Fernandes Ferreira, Yawar Hussain, Rogério Uagoda Acta Carsologica, 2022 Doline mapping is paramount in the vulnerability and risk assessment of the underground karst environment by identifying cave-ground connectivity points at the surface. However, manual mapping is labour-intensive, slow and subjective, especially on a large scale. Therefore, the present study adopted a GIS-based semi-automatic approach for mapping large and medium-sized depressions/dolines in the Corrente river basin in Brazil, with a particular focus on the environmentally preserved areas of river Vermelho (APANRV Portuguese abbreviation) using remote sensing (DEM and Google Earth imagery) and field-based observations. Seven typical dolines forms (e.g., cockpit with drain insertion, collapse, collapse with river capture, suffosion, solution, cover collapse, and buried) are found from extensive field surveys. As an outcome of the proposed approach, two hundred and thirty-two medium to large-sized dolines have been identified and categorised into three main groups based on the cave density and local geology G1, G2, and G3. The high density of identified dolines (164 known caves) in G1 provides reconnaissance for future speleological works in the preserved areas. Additionally, the presence of a considerable number of dolines in the adjoining areas (G2 and G3) stresses the need to revise the existing boundaries of the APANRV. Results correlate well with the dolines sites marked using field surveys and Google Earth images. This doline mapping may help researchers in the groundwater vulnerability assessment and the protection of speleological heritage preserved in the caves.
Spectral analysis of the recorded ambient vibration at a mass movement in Brasilia Proceedings of the Symposium on the Application of Geophyics to Engineering and Environmental Problems Sageep, 2017
Closed depressions in karstic-quartzitic relief, Ribeirão Santana basin, mid-valley of the Paraíba do Sul River Anuario do Instituto De Geociencias, 2006
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DETERMINAÇÃO E REPRESENTAÇÃO CARTOGRÁFICA DA CONCENTRAÇÃO DE FLUXO (FATOR C) PELO MÉTODO COP NO ALTO CURSO DA BACIA DO RIO CORRENTE NO NORDESTE GOIANO OA de Oliveira, R Uagoda, JE Campos Caderno de Geografia 35 (81), 431-431 , 2025 2025
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Near-surface geophysics in Latin American contexts: its applications, education, and societal perspectives as a whole Y Hussain, S Maciel, C Condori, R Uagoda, W Borges, M Cárdenas-Soto, ... Frontiers in Earth Science 12, 1495375 , 2024 2024
DINÂMICA DOS SEDIMENTOS CLÁSTICOS CAVERNÍCOLAS: POTENCIALIDADE PARA ESTUDO PALEOAMBIENTAIS NO BRASIL DASCDM VITALINA, R UAGODA, NA MORAIS ESPAÇO E GEOGRAFIA Учредители: Biblioteca Central da UNB , 2024 2024
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UAV-based doline mapping in Brazilian karst: A cave heritage protection reconnaissance CF Ferreira, Y Hussain, R Uagoda, TC Silva, RE Cicerelli Open Geosciences 15 (1), 20220535 , 2023 2023 Citations: 7
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On‐and off‐site erosion impacts of restoration measures in a tropical karst watershed MRS Fonseca, HML Chaves, RES Uagoda Earth Surface Processes and Landforms 48 (9), 1701-1711 , 2023 2023 Citations: 4
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Runoff, soil loss, and water balance in a restored Karst area of the Brazilian Savanna MRS Fonseca, RES Uagoda, HML Chaves Catena 222, 106878 , 2023 2023 Citations: 29
A semi-automatic approach for doline mapping in Brazilian covered karst: the way forward to vulnerability assessment CF Ferreira, Y Hussain, R Uagoda Acta Carsologica 51 (1), 19-31 , 2022 2022 Citations: 13
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The potential use of geophysical methods to identify cavities, sinkholes and pathways for water infiltration Y Hussain, R Uagoda, W Borges, J Nunes, O Hamza, C Condori, K Aslam, ... Water 12 (8), 2289 , 2020 2020 Citations: 88
Benefits of the successive GPM based satellite precipitation estimates IMERG–V03,–V04,–V05 and GSMaP–V06,–V07 over diverse geomorphic and meteorological regions of Pakistan F Satgé, Y Hussain, MP Bonnet, BM Hussain, H Martinez-Carvajal, ... Remote Sensing 10 (9), 1373 , 2018 2018 Citations: 40
Multiple geophysical techniques for investigation and monitoring of Sobradinho landslide, Brazil Y Hussain, M Cardenas-Soto, S Martino, C Moreira, W Borges, O Hamza, ... Sustainability 11 (23), 6672 , 2019 2019 Citations: 38
Runoff, soil loss, and water balance in a restored Karst area of the Brazilian Savanna MRS Fonseca, RES Uagoda, HML Chaves Catena 222, 106878 , 2023 2023 Citations: 29
Detection of cover collapse doline and other Epikarst features by multiple geophysical techniques, case study of Tarimba cave, Brazil Y Hussain, R Uagoda, W Borges, R Prado, O Hamza, M Cárdenas-Soto, ... Water 12 (10), 2835 , 2020 2020 Citations: 29
Sobre a gênese da arenização no sudoeste do Rio Grande do Sul DMA Suertegaray, R Verdum, ET Bellanca, RS Uagoda Terra Livre 1 (24), 135-150 , 2005 2005 Citations: 24
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Late Quaternary episodes of clastic sediment deposition in the Tarimba Cave, Central Brazil D Caldeira, R Uagoda, AM Nogueira, J Garnier, AO Sawakuchi, ... Quaternary International 580, 22-37 , 2021 2021 Citations: 20
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Ambient seismic noise: A continuous source for the dynamic monitoring of landslides Y Hussain, H Martinez-Carvajal, C Condori, R Uagoda, M Cárdenas-Soto, ... Terrae Didatica 15, e019012-e019012 , 2019 2019 Citations: 17
Karstic morphology control in non-carbonate rocks: Santana basin, middle Paraiba do Sul river valley, Brazil R Uagoda, A Avelar, ALC Netto Zeitschrift fur Geomorphologie 55 (1), 1 , 2011 2011 Citations: 17
Hydrogeophysical characterization of fractured aquifers for groundwater exploration in the Federal District of Brazil Y Hussain, JEG Campos, WR Borges, RES Uagoda, O Hamza, ... Applied Sciences 12 (5), 2509 , 2022 2022 Citations: 16
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Análise da predição do balanço hídrico da bacia do ribeirão do Gama-DF através do modelo SWAT RES Uagoda Revista Brasileira de Geografia Física 10 (03), 880-893 , 2017 2017 Citations: 10
Depressões fechadas em relevo cárstico-quartzítico, bacia do ribeirão Santana, médio vale do rio Paraíba do Sul R Uagoda, A de Souza Avelar, ALC Netto Anuário do Instituto de Geociências 29 (2), 87-100 , 2006 2006 Citations: 10
GIS-Based Relief Compartment Mapping of Fluvio-Karst Landscape in Central Brazilian Highlands: GIS-Based Relief Compartment Mapping of Fluvio-Karst Landscape in Central … Y Hussain, R Uagoda Settings International Journal of Economic and Environmental Geology (IJEEG … , 2020 2020 Citations: 9