Aaron Micallef

Aaron Micallef

University of Malta

H-index: 31

Europe-Malta

About Aaron Micallef

Aaron Micallef, With an exceptional h-index of 31 and a recent h-index of 25 (since 2020), a distinguished researcher at University of Malta, specializes in the field of Marine geology, Marine geosciences, Marine geomorphology.

His recent articles reflect a diverse array of research interests and contributions to the field:

Evolution of submarine canyons and hanging-wall fans: insights from geomorphic experiments and morphodynamic models

Offshore freshened groundwater emplacement in an evolving siliciclastic margin (Canterbury Bight, New Zealand): A 3D modeling approach

Assessing freshwater plumes, offshore freshened groundwater and the risk of salt intrusions in urbanised karstic groundwater systems using combined resistivity methods

Exploring the potential of the north-eastern Adriatic basin to host freshened groundwater using onshore-offshore 3D hydrogeological modelling.

Climate-induced variations in arthropod habitats of the Circum-Sicilian islands according to convection permitting simulations of the Mediterranean driven by CMIP6 and PMIP4 data

Characterizing offshore freshened groundwater salinity patterns using trans‐dimensional Bayesian inversion of controlled source electromagnetic data: A case study from the …

Methane seeps features characterization on the Moñito continental shelf, Colombian Caribbean, through a multi-scale and multi-method approach

Comparative single-cell genomics of Atribacterota JS1 in the Japan Trench hadal sedimentary biosphere

Aaron Micallef Information

University

University of Malta

Position

___

Citations(all)

2836

Citations(since 2020)

1968

Cited By

1648

hIndex(all)

31

hIndex(since 2020)

25

i10Index(all)

58

i10Index(since 2020)

54

Email

University Profile Page

University of Malta

Aaron Micallef Skills & Research Interests

Marine geology

Marine geosciences

Marine geomorphology

Top articles of Aaron Micallef

Evolution of submarine canyons and hanging-wall fans: insights from geomorphic experiments and morphodynamic models

Authors

Steven YJ Lai,David Amblas,Aaron Micallef,Hervé Capart

Journal

Earth Surface Dynamics

Published Date

2024/4/29

Tectonics play a significant role in shaping the morphology of submarine canyons, which form essential links in source-to-sink (S2S) systems. It is difficult, however, to investigate the resulting morphodynamics over the long term. For this purpose, we propose a novel experimental approach that can generate submarine canyons and hanging-wall fans on continuously evolving active faults. We utilize morphometric analysis and morphodynamic models to understand the response of these systems to fault slip rate () and inflow discharge (). Our research reveals several key findings. Firstly, the fault slip rate controls the merging speed of submarine canyons and hanging-wall fans, which in turn affects their quantity and spacing. Additionally, the long profile shapes of submarine canyons and hanging-wall fans can be decoupled into a gravity-dominated breaching process and an underflow-dominated diffusion process, which can be described using a constant-slope relationship and a morphodynamic diffusion model, respectively. Furthermore, both experimental and simulated submarine canyon–hanging-wall fan long profiles exhibit strong self-similarity, indicating that the long profiles are scale independent. The Hack's scaling relationship established through morphometric analyses serves as an important link between different scales in S2S systems, bridging laboratory-scale data to field-scale data and submarine-to-terrestrial relationships. Lastly, for deep-water sedimentary systems, we propose an empirical formula to estimate fan volume using canyon length, and the data from 26 worldwide S2S systems utilized for comparison show a …

Offshore freshened groundwater emplacement in an evolving siliciclastic margin (Canterbury Bight, New Zealand): A 3D modeling approach

Authors

Ariel Thomas,Daniel Zamrsky,Kamaldeen Omosanya,Mark Person,Joshu Mountjoy,Aaron Micallef

Published Date

2024/3/7

Offshore freshened groundwater (OFG) represents a globally distributed subsurface resource with potential applications in water management, oil recovery, and environmental studies. Despite growing interest, the understanding of OFG systems, including their geometry, distribution, and emplacement dynamics, remains limited. In this study, we address these gaps by employing a novel 3D geostatistical modeling approach, focusing on the Canterbury Bight, a passive siliciclastic margin with proven OFG resources. Our methodology integrates high-resolution 2D seismic lines and borehole data, allowing us to capture the geological heterogeneity of the passive margin. Unlike traditional static models, our 3D approach considers the evolving stratigraphic architecture over multiple sea-level cycles, offering a more comprehensive understanding of OFG systems. Key findings include the successful incorporation of …

Assessing freshwater plumes, offshore freshened groundwater and the risk of salt intrusions in urbanised karstic groundwater systems using combined resistivity methods

Authors

Jasper Hoffmann,Ercan Erkul,Irfan Yolcubal,Amir Haroon,Pritam Yogeshwar,Simon Fischer,Elif Sen,Wolfgang Rabbel,Ahmet Sener,Jens Schneider von Deimling,Bülent Tezkan,Ertan Peksen,Aaron Micallef,Elnur Gasimov,Ismail Kaplanvural,Felix Gross,Lasse Sander,Serif Baris

Published Date

2024/3/7

Groundwater acts as a critical link between onshore and offshore environments, connecting freshwater systems to saline oceans. With 40% of the world's population residing along coastlines, understanding coastal groundwater reserves is paramount. One open question involves the vital role of submarine groundwater springs in global hydrology, and how the distribution and groundwater flux can be better constrained across the coastline to better predict both groundwater discharge into the ocean and saltwater inflow into coastal aquifers. Especially urban areas pose unique challenges where water demand is high and groundwater exploration problematic since geophysical remote sensing techniques often interfere with surface and subsurface constructions (eg cables, pipelines etc.), making innovative approaches for groundwater exploration crucial for sustainable groundwater management.In this study, we aim …

Exploring the potential of the north-eastern Adriatic basin to host freshened groundwater using onshore-offshore 3D hydrogeological modelling.

Authors

Cristina Corradin,Ariel T Thomas,Angelo Camerlenghi,Luca Zini,Michela Giustiniani,Martina Busetti,Laura Foglia,Claudia Bertoni,Aaron Micallef

Published Date

2024/3/7

Due to their long-term storage capacity, coastal aquifers are an important source of freshwater for industry, agriculture, and human consumption. However, these onshore groundwater aquifers are under enormous stress mostly due to the increase in usage. Thus, in the last decades, there has been a growing interest in alternative freshwater sources, such as offshore freshened groundwater (OFG). This study focuses on the Venetian Friulian Plain (north-eastern Italy) and the neighbouring northern Adriatic Sea and aims to quantify the potential extent and the genesis of the complex aquifer system hosted in the Mid-Late Quaternary siliciclastic sediments. The main objective is to provide an updated hydrogeological overview of the study area, showing the offshore (OFG) extent of the onshore aquifer system. The objective of this paper is achieved through the development of four three-dimensional models of the study …

Climate-induced variations in arthropod habitats of the Circum-Sicilian islands according to convection permitting simulations of the Mediterranean driven by CMIP6 and PMIP4 data

Authors

James Ciarlo,Erika Coppola,Aaron Micallef,David Mifsud

Published Date

2024/3/7

Arthropods play vital roles in the ecosystem (eg, pollinators, decomposers, biological pest control), and thus can act as indicators of ecosystem integrity. The state of these ecosystems is sensitive to variations in climate conditions, especially on small islands. The Circum-Sicilian islands are a chain of small islands around Sicily in the central Mediterranean. With the use of Convection permitting simulations, many of these islands can finally be adequately resolved. The objective of the project PALEOSIM (PALEOclimate modelling of Small Islands in the Mediterranean and possible impacts on arthropod habitats) is to study climate impacts on the habitats of arthropods (mainly insects) in the Circum-Sicilian islands. To achieve this, RegCM5 is driven by CMIP6 and PMIP4 data for a 3 km region covering the west and central Mediterranean.Climate indices from the simulations have been used to assess the ecological …

Characterizing offshore freshened groundwater salinity patterns using trans‐dimensional Bayesian inversion of controlled source electromagnetic data: A case study from the …

Authors

Zahra Faghih,Amir Haroon,Marion Jegen,Romina Gehrmann,Katrin Schwalenberg,Aaron Micallef,Jan Dettmer,Christian Berndt,Joshu Mountjoy,Bradley A Weymer

Journal

Water Resources Research

Published Date

2024/3

The study of offshore freshened groundwater (OFG) is gaining importance due to population growth and environmental pressure on coastal water resources. Marine controlled source electromagnetic (CSEM) methods can effectively map the spatial extent of OFG systems using electrical resistivity as a proxy. Integrating these resistivity models with sub‐surface properties, such as host‐rock porosity, allows for estimates of pore‐water salinity. However, evaluating the uncertainty in pore‐water salinity using resistivity models obtained from deterministic inversion approaches presents challenges, as they provide only one best‐fit model, with no associated estimate of uncertainty. To address this limitation, we employ trans‐dimensional Markov‐Chain Monte‐Carlo inversion on marine time‐domain CSEM data, acquired in the Canterbury Bight, New Zealand. We integrate resistivity posterior probability distributions with …

Methane seeps features characterization on the Moñito continental shelf, Colombian Caribbean, through a multi-scale and multi-method approach

Authors

Andrea Giulia Varzi,Giulia Galimberti,Aaron Micallef,Alessandra Savini,Paula Andrea Ramirez Zapata

Published Date

2024/3/7

When referring to gas in marine sediment, we mean natural gas trapped in the sub-bottom sediments and escaping from the sub-seafloor into the marine environments. Among gases, methane is the most common one, and may have diverse origins, including both thermogenic or microbial sources. Natural seepages are globally distributed, with notable occurrences along continental margins. They significantly affect the local marine ecosystems and the surrounding substrate, other than being a wake-up call in terms of geohazards.Since the discovery of the Chuchupa and Ballenas fields in the 1970s, the offshore Colombian Caribbean has been considered a gas province mainly dominated by methane, most likely generated by microbial/thermogenic activities. Nevertheless, there is still little knowledge of this area. Since methane is a potent greenhouse gas, it is important to evaluate the contribution of seabed …

Comparative single-cell genomics of Atribacterota JS1 in the Japan Trench hadal sedimentary biosphere

Authors

Kana Jitsuno,Tatsuhiko Hoshino,Yohei Nishikawa,Masato Kogawa,Katsuhiko Mineta,Michael Strasser,Ken Ikehara,Jeremy Everest,Lena Maeda,Fumio Inagaki,Haruko Takeyama,Piero Bellanova,Morgane Brunet,Zhirong Cai,Antonio Cattaneo,Katharina Hochmuth,Kanhsi Hsiung,Takashi Ishizawa,Takuya Itaki,Kana Jitsuno,Joel Johnson,Toshiya Kanamatsu,Myra Keep,Arata Kioka,Christian Maerz,Cecilia McHugh,Aaron Micallef,Luo Min,Dhananjai Pandey,Jean Noel Proust,Troy Rasbury,Natascha Riedinger,Rui Bao,Yasufumi Satoguchi,Derek Sawyer,Chloe Seibert,Maxwell Silver,Susanne Straub,Joonas Virtasalo,Yonghong Wang,Ting-Wei Wu,Sarah Zellers,Martin Kölling,Jyh-Jaan Steven Huang,Yoshitaka Nagahashi,IODP Expedition 386 Scientists

Journal

Msphere

Published Date

2024/1/3

Deep-sea and subseafloor sedimentary environments host heterotrophic microbial communities that contribute to Earth’s carbon cycling. However, the potential metabolic functions of individual microorganisms and their biogeographical distributions in hadal ocean sediments remain largely unexplored. In this study, we conducted single-cell genome sequencing on sediment samples collected from six sites (7,445–8,023 m water depth) along an approximately 500 km transect of the Japan Trench during the International Ocean Discovery Program Expedition 386. A total of 1,886 single-cell amplified genomes (SAGs) were obtained, offering comprehensive genetic insights into sedimentary microbial communities in surface sediments (<1 m depth) above the sulfate-methane transition zone along the Japan Trench. Our genome data set included 269 SAGs from Atribacterota JS1, the predominant bacterial clade in …

Offshore freshened groundwater identified in southern Sicily (Italy) by applying well logs petrophysical interpretation.

Authors

Damiano Chiacchieri,Lorenzo Lipparini,Aaron Micallef,Elizabeth Quiroga

Published Date

2024/3/7

A first step was the digitization of the full suite of logs required for the application of petrophysical workflow for each well analysed, for a total of about 25 km of digitized logs, such as SP (Spontaneous Potential), GR (Gamma Ray), DT (Sonic log) and Resistivity logs. At the same time a synthetic lithological log for each selected well was built, to support the understanding of lithological influence of electrical logs. A customised petrophysical workflow to calculate porosity and salinity (concentration of salts in TDS) was applied, considering: lithotypes, BHT (borehole temperatures), porosity (derived to DT–sonic log), pore fluid resistivity.

The intriguing hypothesis of a modern “Rosengarten” in the subsurface of the deep Ionian Basin

Authors

Angelo Camerlenghi,Christian Huebscher,Aaron Micallef,Claudia Bertoni,Giovanni Aloisi,Johanna Lofi

Published Date

2024/3/7

From 2016 to 2020, Judy McKenzie joined the community of COST Action CA15103-Uncovering the Mediterranean salt giant (MEDSALT) to verify her hypothesis that an ongoing dolomitization front exists in the pelagic sediments overlying Messinian evaporites below the Messina Abyssal Plain, in~ 4000 water depth in the Ionian Sea, central Mediterranean. Legacy scientific ocean drilling data from DSDP Leg 42A, Site 374 reveal a 25 m-thick latest Miocene dolomitic mudstone capped by 8.5 m of earliest Pliocene dolomite above gypsum/dolomitic mudstone cycles and anhydrite and salts. The Pliocene dolomite is made of dolomicrite with an unusual crystal morphology, suggesting diagenetic replacement of the original pelagic calcite ooze. The underlying latest Messinian dolomitic mudstone with minor gypsum layers contains Ca-rich dolomite with white spherules of lüneburgite. DSDP Site 374 shipboard interstitial water geochemical profiles further indicate that saline brine is diffusing upwards into the early Pliocene dolomicrite. A significant decrease in sulfate concentration suggests ongoing bacterial sulfate reduction, whereas the chloride profile remains constant.Following discussion and brainstorming with Judy, a geophysical site investigation cruise on the RV Meteor was organized by the University of Hamburg. Cruise M-144 was conducted in 2018 with a multi-channel reflection seismic survey centered at DSDP Leg 42A, Site 374 using a 6 kjoule sparker source and a digital 144-channel streamer with an active length of 600 m. The objectives of the cruise were to:

Submarine volcanism in the western Sicilian Channel, Cruise No. M191 SUAVE (GPF 21-1_036), 16.07. 2023-05.08. 2023, Algeciras (Spain)-Piraeus (Greece)

Authors

Jörg Geldmacher,Aaron Micallef,Odysseas Archontikis,Meret Felgendreher,Giulia M Ferrante,Jonathan Ford,Jacqueline Grech Licari,Folkmar Hauff

Published Date

2023

The origin and role of volcanism in passive continental rifts remains poorly understood relative to other volcano-tectonic settings. The western Sicilian Channel in the central Mediterranean Sea represents an area of pronounced crustal extension with a variety of volcanic landforms closely associated with extensional faults. The main goal of our study is to analyze how volcanism has developed in conjunction with tectonic structures in the western Sicilian Channel. Therefore, we have extensively mapped (with multibeam echo sounder, sediment echo sounder, and towed magnetometer) the seafloor and sampled (chain bag dredge) unexplored volcanic structures along the Sicilian Channel Rift Zone and the Capo-Granitola-Sciacca Fault Zone. One unexpected result is that many features shown in the predicted bathymetry as seamount-like elevation, and which were previously interpreted as presumably volcanic edifices/cones, turned out to be either non- existent or no evidence for an igneous nature (magnetometer data/dredging results) could be established. On the other hand, three previously unknown volcanic outcrops were discovered and partly sampled. The obtained data and collected samples will provide new insights into the role of magmatism in regions of continental extension, and will allow us to develop a tectonic and magmatic framework for the western Sicilian Channel.

SWAN: A surface-towed modular controlled-source electromagnetic system for mapping submarine groundwater discharge and offshore groundwater resources

Authors

Anna Eliana Pastoressa,Amir Haroon,Mark E Everett,Lea Rohde,Thies Bartels,Martin Wollatz-Vogt,Zahra Faghih,Gesa Katharina Franz,Aaron Micallef

Journal

The Leading Edge

Published Date

2023/9

Offshore freshened groundwater (OFG) and submarine groundwater discharge (SGD) are important components of coastal hydrologic systems. A lack of understanding of offshore groundwater systems and their interactions with onshore systems along the majority of global coastlines still exists due to a general paucity of field data. Recently, controlled-source electromagnetic (CSEM) techniques have emerged as a promising noninvasive method for identifying and characterizing OFG and SGD. Unfortunately, only a few systems are available in academic and research institutions worldwide, and applications are limited to specific regions. These systems are often limited by relatively high deployment costs, slow data acquisition rates, logistical complexity, and lack of modification options. A relatively inexpensive and user-friendly CSEM system is needed to overcome these limitations. We present the initial theoretical …

Extensive freshened groundwater resources emplaced during the Messinian sea-level drawdown in southern Sicily, Italy

Authors

Lorenzo Lipparini,Damiano Chiacchieri,Roberto Bencini,Aaron Micallef

Journal

Communications Earth & Environment

Published Date

2023/11/22

Deep groundwater resources around the world represent an important potential unconventional source of water. Here we document an extensive (17.3 km3) fresh/brackish groundwater body preserved in a deep (between 800 and 2100 m) carbonate platform aquifer (Gela Formation.) in southern Sicily (Italy), by using deep well data and a 3D hydrogeological modelling. We attribute the distribution of this fossil groundwater to topographically-driven meteoric recharge driven by the Messinian sea-level drawdown, which we estimate to have reached 2400 m below present sea level in the eastern Mediterranean Basin. The discovery of such an extensive and deep freshened groundwater has significant implications in terms of resource potential for southern Sicily as well as other Mediterranean coastal regions, which share similar geological setting and water scarcity issues.

Coupled CFD-DEM Modelling of subsidence and canyon formation in an evaporite karst system

Authors

Djamil Al-Halbouni,Lars Ruepke,Monica Giona Bucci,Torsten Dahm,Aaron Micallef

Journal

EGU General Assembly Conference Abstracts

Published Date

2023/5

Surface stream-channels and subsurface conduits form the connecting interface between on-and offshore groundwater in the coastal transition zone. Rapid canyon formation occurs due to erosion and dissolution of material rapid retrogressive growth, slope failure, and subsidence, thus posing important geohazards in coastal areas. We here focus on the formation of canyon systems with theatre shaped heads as found along the Dead Sea. Underlying their recent development is a dynamic evaporite karst system fed by channelized groundwater flow with subrosion processes and subsequent discharge into the lake. We use a 3D hydromechanical modelling approach to derive information on the hydromechanics and feedback between changing fluid pathways, deformation and the formation of stream-channel morphologies under varying conditions. We use a hydrogeological setup consisting of (A) a layered alluvial …

Testing the potential of a submarine fibre optic cable to detect sediment gravity flows using laser interferometry

Authors

Irena Schulten,Cecilia Clivati,Aaron Micallef,Simone Donadello,Davide Calonico,André Xuereb,Alberto Mura,Filippo Levi

Journal

EGU General Assembly Conference Abstracts

Published Date

2023/5

Sediment gravity flows are common processes in the submarine environment. They are important for the global sediment transport, but can destroy offshore infrastructure and may even contribute to tsunami generation. These flows, however, remain poorly understood. There is a lack of direct observations due to difficulties with deploying appropriate instruments and predicting the occurrence and route of these flows, especially on open continental slopes. Deployed instruments are further often destroyed as a result of the gravity flows. Submarine fibre cables are present along almost all continental margins worldwide. They are economically important for telecommunication and internet data transfer. Historic records, however, have shown that submarine gravity flows affect and even severe these cables. Recent studies successfully tested the usage of fibre optic cables to detect earthquakes and other processes such …

Salt leaching by freshwater and its impact on seafloor stability: An experimental investigation

Authors

Nader Saadatkhah,Azman Kassim,Qurratu Aini Siat,Aaron Micallef

Journal

Marine Geology

Published Date

2023/1/1

Offshore freshened groundwater (OFG) has been documented in many continental margins worldwide. OFG systems are dynamic, expanding and contracting with falling and rise sea-levels. OFG has long been thought to be an important geomorphic agent in continental margins, either via active discharge at the seafloor, which can erode depressions, or the generation of excess pore pressure, which can deform sediments and cause slope failure. It has also been proposed that OFG flow can drive the loss of sediment shear strength via salt leaching, when seawater in pores is replaced by freshwater. Here, we measure changes in the geotechnical properties of seafloor clayey silt due to salt leaching using flushing experiments, and assess the implications of these changes on the stability of siliciclastic continental margins with 2D limit equilibrium modelling. We document a ∼ 50% decrease in undrained cohesive …

Fresh submarine groundwater discharge offshore Wellington (New Zealand): hydroacoustic characteristics and its influence on seafloor geomorphology

Authors

Jasper JL Hoffmann,Joshu J Mountjoy,Erica Spain,Mark Gall,Leigh W Tait,Yoann Ladroit,Aaron Micallef

Journal

Frontiers in Marine Science

Published Date

2023/8/11

Fresh submarine groundwater discharge (FSGD) influences the biogeochemistry of coastal areas and can be a proxy for potential untapped resources of offshore freshened groundwater (OFG). In most areas however, the onshore-offshore connection and the recharge characteristics of offshore aquifers are poorly constrained, making a potential exploitation of this resource challenging. Offshore Wellington (New Zealand), a well-defined onshore aquifer system extends beneath the harbour, where substantial amounts of freshwater seep out from the ocean floor. The aquifer system has been studied in detail and recently the first attempts worldwide have been made here to use the offshore groundwater as a future source of drinking water. However, the locations and extent of FSGD as well as its influence on seafloor morphology are still poorly understood. Exact localisation of FSGD sites is essential to sample and …

Reconstruction of the 1908 Messina gravity flow (central Mediterranean Sea) from geophysical and sedimentological data

Authors

I Schulten,Aaron Micallef,Sebastian Krastel,Morelia Urlaub,M-A Gutscher,Heidrun Kopp

Journal

Marine Geology

Published Date

2023/5/1

Earthquakes, tsunamis and gravity flows are common processes offshore Eastern Sicily and pose a significant hazard to coastal communities and infrastructure. The 1908 Messina earthquake and tsunami resulted in >60,000 casualties. It caused a large turbidity current, which broke the Malta-Zante telegraph cable. Yet, this gravity flow remains poorly characterised in terms of its route and flow behaviour. A comprehensive analysis of multibeam echosounder data, sub-bottom profiles, and sediment cores has been carried out to improve our understanding about gravity flow activity within conduit systems of the western Ionian Basin to reconstruct the characteristics of the 1908 sediment flow (e.g., erosion, velocity, source region). Three main canyon-channel systems can be distinguished within the study area. The easternmost system (C3) appears to be the most active in terms of sediment transport. There are …

Can offshore meteoric groundwater generate mechanical instabilities in passive continental margins?

Authors

Aaron Micallef,Mark Person,Shubhangi Gupta,Nader Saadatkhah,Adrien Camille,Òscar Gratacós

Journal

Journal of Geophysical Research: Earth Surface

Published Date

2023/3

Offshore meteoric groundwater (OMG) has long been hypothesized to be a driver of seafloor geomorphic processes in continental margins worldwide. Testing this hypothesis has been challenging because of our limited understanding of the distribution and rate of OMG flow and seepage, and their efficacy as erosive/destabilizing agents. Here we carry out numerical simulations of groundwater flow and slope stability using conceptual models and evolving stratigraphy—for passive siliciclastic and carbonate margin cases—to assess whether OMG and its evolution during a late Quaternary glacial cycle can generate the pore pressures required to trigger mechanical instabilities on the seafloor. Conceptual model results show that mechanical instabilities using OMG flow are most likely to occur in the outer shelf to upper slope, at or shortly before the Last Glacial Maximum sea‐level lowstand. Models with evolving …

Long-term morphological and sedimentological changes caused by bottom trawling on the northern Catalan continental shelf (NW Mediterranean)

Authors

Ruth Durán,Pere Puig,Sarah Paradis,Jorge Guillén,Albert Palanques,Claudio Lo Iacono,Marta Arjona-Camas,Araceli Muñoz,Aaron Micallef

Journal

Frontiers in Marine Science

Published Date

2023/11/16

Bottom trawling is a fishing method that involves towing of nets along the seafloor to catch demersal species. The dragging of trawling gears along the seafloor results in scraping and ploughing of the surficial sediments, leading to the formation of turbid plumes of resuspended sediments and causing measurable changes in the seabed morphology. High-resolution multibeam data, side scan sonar, sediment grain size and vessel tracking data have been used to investigate the impact of bottom trawling on the seafloor morphology and surficial sediments of the northern Catalan continental shelf (NW Mediterranean), providing new insights into the impact of this anthropogenic activity on the seafloor. Multibeam data evidenced the occurrence of large-scale erosive features as a consequence of repeated scouring by fishing gears in localized areas. They are characterized by elongated (70-300 m wide and up to 8 km long) channelized areas of high backscatter with variable incision (from 0.2 m to 1.2 m). The spatial distribution of these morphologies shows a similar pattern to that observed in the fishing intensity, with maximum values in the areas of increased trawling intensity, corresponding to the main fishing grounds. Side scan sonar data also shows higher densities of trawl marks in these areas than in the surroundings. Sediment cores collected on these features show an upward-coarsening trend in the first 4-5 cm of the core, suggesting that part of the finer fraction resuspended by trawling is winnowed, increasing the sand content of the surface sediment. The identification of such large erosive morphologies in the main fishing grounds evidences …

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Aaron Micallef FAQs

What is Aaron Micallef's h-index at University of Malta?

The h-index of Aaron Micallef has been 25 since 2020 and 31 in total.

What are Aaron Micallef's top articles?

The articles with the titles of

Evolution of submarine canyons and hanging-wall fans: insights from geomorphic experiments and morphodynamic models

Offshore freshened groundwater emplacement in an evolving siliciclastic margin (Canterbury Bight, New Zealand): A 3D modeling approach

Assessing freshwater plumes, offshore freshened groundwater and the risk of salt intrusions in urbanised karstic groundwater systems using combined resistivity methods

Exploring the potential of the north-eastern Adriatic basin to host freshened groundwater using onshore-offshore 3D hydrogeological modelling.

Climate-induced variations in arthropod habitats of the Circum-Sicilian islands according to convection permitting simulations of the Mediterranean driven by CMIP6 and PMIP4 data

Characterizing offshore freshened groundwater salinity patterns using trans‐dimensional Bayesian inversion of controlled source electromagnetic data: A case study from the …

Methane seeps features characterization on the Moñito continental shelf, Colombian Caribbean, through a multi-scale and multi-method approach

Comparative single-cell genomics of Atribacterota JS1 in the Japan Trench hadal sedimentary biosphere

...

are the top articles of Aaron Micallef at University of Malta.

What are Aaron Micallef's research interests?

The research interests of Aaron Micallef are: Marine geology, Marine geosciences, Marine geomorphology

What is Aaron Micallef's total number of citations?

Aaron Micallef has 2,836 citations in total.

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