Fernando Mazo D’Affonseca

Universidade Estadual Paulista (Unesp)

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Fábio Augusto Gomes Vieira Reis

Universidade Estadual Paulista (Unesp)

Peter Grathwohl

University of Tübingen

Lucília do Carmo Giordano

Universidade Estadual Paulista (Unesp)

Claudia Vanessa dos Santos Corrêa

Instituto de Geociencias

Michael Finkel

Technische Hochschule Augsburg

Philipp Blum

Karlsruhe Institute of Technology

Victor Carvalho Cabral

University of Tübingen

Marcelo Fischer Gramani

Instituto de Pesquisas Tecnológicas

Felipe Vemado

Universidade de São Paulo

Henning Prommer

University of Western Australia

Cooperative Institutions

Universidade Estadual Paulista (Unesp)

Instituto de Geociencias

University of Tübingen

Institute of Geosciences

Weatherford College

Supply Chain Competence Center (Germany)

École Polytechnique Fédérale de Lausanne

Universidade de São Paulo

Bernstein Center for Computational Neuroscience Tübingen

Helmholtz Centre for Environmental Research

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Evolution of carbon isotope signatures during reactive transport of hydrocarbons in heterogeneous aquifers

Journal of Contaminant Hydrology (2015)

Dominik Höyng Henning Prommer Philipp Blum Peter Grathwohl Fernando Mazo D’Affonseca

Isotope Analysis

Isotope dilution

10.1016/j.jconhyd.2014.12.005

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Citations (25)

Numerical modeling of a high magnitude debris-flow event occurred in Brazil

Natural Hazards (2024)

Claudia Vanessa dos Santos Corrêa Fábio Augusto Gomes Vieira Reis Lucília do Carmo Giordano Victor Carvalho Cabral Vinícius Queiroz Veloso

Debris flow

Natural hazard

10.1007/s11069-024-06728-5

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Citations (1)

A Step towards Integrating CMORPH Precipitation Estimation with Rain Gauge Measurements

Advances in Meteorology (2018)

Augusto José Pereira Filho Felipe Vemado Guilherme Vemado Fábio Augusto Gomes Vieira Reis Lucília do Carmo Giordano

Accurate daily rainfall estimation is required in several applications such as in hydrology, hydrometeorology, water resources management, geomorphology, civil protection, and agriculture, among others. CMORPH daily rainfall estimations were integrated with rain gauge measurements in Brazil between 2000 and 2015, in order to reduce daily rainfall estimation errors by means of the statistical objective analysis scheme (SOAS). Early comparisons indicated high discrepancies between daily rain gauge rainfall measurements and respective CMORPH areal rainfall accumulation estimates that tended to be reduced with accumulation time span (e.g., yearly accumulation). Current results show CMORPH systematically underestimates daily rainfall accumulation along the coastal areas. The normalized error variance (NEXERVA) is higher in sparsely gauged areas at Brazilian North and Central-West regions. Monthly areal rainfall averages and standard deviation were obtained for eleven Brazilian watersheds. While an overall negative tendency (3 mm·h −1 ) was estimated, the Amazon watershed presented a long-term positive tendency. Monthly areal mean precipitation and respective spatial standard deviation closely follow a power-law relationship for data-rich watersheds, i.e., with denser rain gauge networks. Daily SOAS rainfall accumulation was also used to calculate the spatial distribution of frequencies of 3-day rainfall episodes greater than 100 mm. Frequencies greater than 3% were identified downwind of the Peruvian Andes, the Bolivian Amazon Basin, and the La Plata Basin, as well as along the Brazilian coast, where landslides are recurrently triggered by precipitation.

Hydrometeorology

10.1155/2018/2095304

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Citations (27)

Environmental sensitivity index maps to manage oil spill risks: A review and perspectives

Ocean & Coastal Management (2023)

Fernando Mazo D’Affonseca Fábio Augusto Gomes Vieira Reis Claudia Vanessa dos Santos Corrêa Arthur Wieczorek Lucília do Carmo Giordano

Vulnerability

Contingency plan

10.1016/j.ocecoaman.2023.106590

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Citations (20)

Modeling the long-term and transient evolution of biogeochemical and isotopic signatures in coal tar-contaminated aquifers

Water Resources Research (2011)

Fernando Mazo D’Affonseca Henning Prommer Michael Finkel Philipp Blum Peter Grathwohl

Reactive transport modeling is a critical element in assessing the potential of natural attenuation of groundwater pollutants. In the present study, we developed a comprehensive quantitative model that incorporates the key processes affecting the long‐term fate of complex organic compound mixtures released from coal tar–type dense nonaqueous phase liquid sources. The model framework addresses the simulation of the long‐term dynamics of source zone depletion, the fate of the released compounds during reactive transport in the groundwater, the evolution of the aquifer's biogeochemical response, in particular its redox conditions, and the redox‐dependent carbon isotope fractionation of selected organic compounds. The modeling framework was applied for the interpretation of observed biogeochemical and isotopic data from a well‐characterized coal tar–contaminated site in northern Germany. The simulations highlight the diversity of fates of the individual compounds, which result from their widely varying physicochemical characteristics, and also how complex interactions develop over the lifetime of the contamination. The highly transient release of contaminants from the coal tar as pool and as heterogeneously distributed blobs in the source zone triggers continuously changing biogeochemical conditions and isotope signatures. The modeling results illustrate how difficult and uncertain the assessment of contaminant fate can be if the collected data cover only a small time window relative to the transport time scale. This emphasizes the need for a holistic understanding of the governing processes that control the effectiveness of monitored natural attenuation before it is implemented as a passive remediation strategy at nonaqueous phase liquid–contaminated sites.

Biogeochemical Cycle

10.1029/2010wr009108

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Citations (34)

High-resolution aquifer analog of fluvial–aeolian sediments of the Guarani aquifer system

Environmental Earth Sciences (2013)

Dominik Höyng Fernando Mazo D’Affonseca Peter Bayer Edson Gomes de Oliveira José Alexandre J. Perinotto

Outcrop

10.1007/s12665-013-2684-5

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Citations (15)

Field scale characterization and modeling of contaminant release from a coal tar source zone

Journal of Contaminant Hydrology (2008)

Fernando Mazo D’Affonseca Philipp Blum Michael Finkel Reiner Melzer Peter Grathwohl

tar (computing)

10.1016/j.jconhyd.2008.03.011

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Citations (30)

Combining implicit geological modeling, field surveys, and hydrogeological modeling to describe groundwater flow in a karst aquifer

Hydrogeology Journal (2020)

Fernando Mazo D’Affonseca Michael Finkel Olaf A. Cirpka

Abstract In three-dimensional (3-D) implicit geological modeling, the bounding surfaces between geological units are automatically constructed from lithological contact data (position and orientation) and the location and orientation of potential faults. This approach was applied to conceptualize a karst aquifer in the Middle Triassic Muschelkalk Formation in southwest Germany, using digital elevation data, geological maps, borehole logs, and geological interpretation. Dip and strike measurements as well as soil-gas surveys of mantel-borne CO 2 were conducted to verify the existence of an unmapped fault. Implicit geological modeling allowed the straightforward assessment of the geological framework and rapid updates with incoming data. Simultaneous 3-D visualizations of the sedimentary units, tectonic features, hydraulic heads, and tracer tests provided insights into the karst-system hydraulics and helped guide the formulation of the conceptual hydrogeological model. The 3-D geological model was automatically translated into a numerical single-continuum steady-state groundwater model that was calibrated to match measured hydraulic heads, spring discharge rates, and flow directions observed in tracer tests. This was possible only by introducing discrete karst conduits, which were implemented as high-conductivity features in the numerical model. The numerical groundwater flow model was applied to initially assess the risk from limestone quarrying to local water supply wells with the help of particle tracking.

10.1007/s10040-020-02220-z

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Citations (28)

Characterization of a landslide-triggered debris flow at a rainforest-covered mountain region in Brazil

Natural Hazards (2021)

Victor Carvalho Cabral Fábio Augusto Gomes Vieira Reis Fernando Mazo D’Affonseca Ana Lucía Claudia Vanessa dos Santos Corrêa

Abstract Debris flows represent great hazard to humans due to their high destructive power. Understanding their hydrogeomorphic dynamics is fundamental in hazard assessment studies, especially in subtropical and tropical regions where debris flows have scarcely been studied when compared to other mass-wasting processes. Thus, this study aims at systematically analyzing the meteorological and geomorphological factors that characterize a landslide-triggered debris flow at the Pedra Branca catchment (Serra do Mar, Brazil), to quantify the debris flow’s magnitude, peak discharge and velocity. A magnitude comparison with empirical equations (Italian Alps, Taiwan, Serra do Mar) is also conducted. The meteorological analysis is based on satellite data and rain gauge measurements, while the geomorphological characterization is based on terrestrial and aerial investigations, with high spatial resolution. The results indicate that it was a large-sized stony debris flow, with a total magnitude of 120,195 m 3 , a peak discharge of 2146.7 m 3 s −1 and a peak velocity of 26.5 m s −1 . The debris flow was triggered by a 188-mm rainfall in 3 h (maximum intensity of 128 mm h −1 ), with an estimated return period of 15 to 20 years, which, combined with the intense accumulation of on-channel debris (ca. 37,000 m 3 ), indicates that new high-magnitude debris flows in the catchment and the region are likely to occur within the next two decades. The knowledge of the potential frequency and magnitude ( F – M ) can support the creation of F – M relationships for Serra do Mar, a prerequisite for reliable hazard management and monitoring programs.

Debris flow

Mass wasting

Hazard map

Natural hazard

10.1007/s11069-021-04811-9

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Citations (22)

Fate of nitrate during groundwater recharge in a fractured karst aquifer in Southwest Germany

Hydrogeology Journal (2021)

Anna‐Neva Visser Moritz F. Lehmann Hermann Rügner Fernando Mazo D’Affonseca Peter Grathwohl

Abstract Over the past decades, fractured and karst groundwater systems have been studied intensively due to their high vulnerability to nitrate (NO 3 − ) contamination, yet nitrogen (N) turnover processes within the recharge area are still poorly understood. This study investigated the role of the karstified recharge area in NO 3 − transfer and turnover by combining isotopic analysis of NO 3 − and nitrite (NO 2 − ) with time series data of hydraulic heads and specific electrical conductivity from groundwater monitoring wells and a karstic spring in Germany. A large spatial variability of groundwater NO 3 − concentrations (0.1–0.8 mM) was observed, which cannot be explained solely by agricultural land use. Natural-abundance N and O isotope measurements of NO 3 − (δ 15 N and δ 18 O) confirm that NO 3 − derives mainly from manure or fertilizer applications. Fractional N elimination by denitrification is indicated by relatively high δ 15 N- and δ 18 O-NO 3 − values, elevated NO 2 − concentrations (0.05–0.14 mM), and δ 15 N-NO 2 − values that were systematically lower than the corresponding values of δ 15 N-NO 3 − . Hydraulic and chemical response patterns of groundwater wells suggest that rain events result in the displacement of water from transient storage compartments such as the epikarst or the fissure network of the phreatic zone. Although O 2 levels of the investigated groundwaters were close to saturation, local denitrification might be promoted in microoxic or anoxic niches formed in the ferrous iron-bearing carbonate rock formations. The results revealed that (temporarily) saturated fissure networks in the phreatic zone and the epikarst may play an important role in N turnover during the recharge of fractured aquifers.

Phreatic

10.1007/s10040-021-02314-2

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Citations (22)