The kinetics of the uptake of pollutants by solids in sediments interacts with transitional eddy diffusivity in the pore fluid, leading to different depth-distribution patterns. This work aims to gain insights into the still poorly understood behaviour in the marine environment of the anthropogenic 236U, a recently postulated tracer of water...
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April 18, 2023 (v1)PublicationUploaded on: April 19, 2023
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December 7, 2018 (v1)Publication
El trabajo presenta un estudio de la inundación Zancliense del Mediterráneo (hace 5.3 Ma), aplicando técnicas de simulación numérica de la Mecánica de Fluidos. El modelo hidrodinámico resuelve situaciones dinámicas de inundación y calcula las tasas de erosión del lecho marino. La base de datos batimétrica incluye la configuración dinámica del...
Uploaded on: March 27, 2023 -
October 6, 2022 (v1)Publication
Unsupported 210Pb (210Pbexc) vs. mass depth profiles do not contain enough information as to extract a unique chronology when both, 210Pbexc fluxes and mass sediment accumulation rates (SAR) independently vary with time. Restrictive assumptions are needed to develop a suitable dating tool. A statistical correlation between fluxes and SAR seems...
Uploaded on: December 5, 2022 -
October 3, 2022 (v1)Publication
Estudiamos la orientación de las iglesias de la Asunción en Soria (N=73). El grupo del románico de repoblación (N=45, siglos XII-XIII) muestra patrones de orientación solar: 47% de las iglesias se alinean con el sol del equinoccio (80% de ellas al orto en el equinoccio canónico, 25 de marzo), 26% se orientan al orto solar en la festividad...
Uploaded on: December 4, 2022 -
November 11, 2019 (v1)Publication
Radiometric dating was a revolutionary contribution to the study of sedimentary processes. Empirical data from varved sediments show that unsupported 210Pb (210 Pbexc) fluxes vary over time while they statistically correlate with sediment accumulation rates (SAR). This contradicts the basic assumption of the Constant Rate of Supply (CRS) ...
Uploaded on: March 27, 2023 -
October 3, 2022 (v1)Publication
Lead-210 from natural atmospheric fallout is widely used in multidisciplinary studies for dating recent sediments. In anthropogenically-impacted and/or high energy systems the 210Pb flux onto the sediments may show non-random temporal variability, leading to the failure of classical dating models. The problem of how identifying and dating such...
Uploaded on: December 4, 2022 -
June 30, 2022 (v1)Publication
Lead-210 from natural atmospheric fallout is widely used in multidisciplinary studies to date recent sediments. Some of the 210Pb-based dating models can produce historical records of sediment accumulation rates (SAR) and initial activity concentrations (). The former have been profusely used to track past changes in the sedimentary conditions....
Uploaded on: March 25, 2023 -
October 18, 2022 (v1)Publication
Independent validation has to be an integral part of the 210Pb-based radiometric dating of recent sediments. The combined use of artificial fallout radionuclides leads to serious problems because only the identification of peaks and their use as time-marks is not sufficiently rigorous to ensure the accuracy of dates. Quantitative modelling of...
Uploaded on: December 4, 2022 -
October 6, 2022 (v1)Publication
After half a century, the use of unsupported 210Pb ( 210Pbexc) is still far off from being a well established dating tool for recent sediments with widespread applicability. Recent results from the statistical analysis of time series of fluxes, mass sediment accumulation rates (SAR), and initial activities, derived from varved sediments, place...
Uploaded on: March 24, 2023 -
September 22, 2022 (v1)Publication
Understanding the behaviour of particulate matter and chemicals at the sediment-water interface (SWI) is of interest in environmental studies and risk assessments. These processes are still poorly understood, and this work aims to gain relevant insights by using a kinetic reactive transport model. It merges early diagenetic processes and box...
Uploaded on: March 24, 2023 -
October 19, 2022 (v1)Publication
In recent years an increasing experimental effort has been paid to the study of the sorption process of radionuclides and heavy metals by particulate matter in aquatic environments. This has led to the development of different kinetic box models. Most of them are variations of two basic approaches: one containing several (up to three) parallel...
Uploaded on: December 5, 2022 -
October 17, 2022 (v1)Publication
Most mathematical models for radiometric dating of recent sediments are particular solutions of a unique physical problem: the advective–diffusive transport of a particle-bound radiotracer within a sediment profile that undergoes accretion. Regardless of the particular assumptions about fluxes, sedimentation rates and the diffusion term, all...
Uploaded on: December 4, 2022 -
October 17, 2016 (v1)Publication
Se presenta un estudio arqueoastronómico del templo B (siglo I d.C.) del santuario iberoromano de Virtus Iulia (la turdetana Ituci), dedicado a Caelestis Iuno Lucina, y reconstruido en el Parque Arqueológico de Torreparedones. El emplazamiento está asociado a un calendario de horizonte, en el que los picos de Jabalcuz y Ahíllo marcan el orto...
Uploaded on: December 2, 2022 -
July 25, 2022 (v1)Publication
A numerical model to simulate tsunami propagation in south of Iberia waters has been developed. It is based on the 2D non-linear hydrodynamic equations and allows calculating tsunami run-ups. The model has been validated through the simulation of historical tsunamis. Then it is applied to a risk assessment study to evaluate tsunami flooding...
Uploaded on: March 25, 2023 -
September 5, 2022 (v1)Publication
At least five catastrophic tsunami events have affected the Iberian Atlantic coasts during the last 7000 years. During this time, the former Gulf of Tartessos evolved towards the present marshland area, in the lower Guadalquivir valley (SW Spain). Ancient cultures flourished and vanished around this waterbody which, with its tidal dynamics, was...
Uploaded on: December 4, 2022 -
October 18, 2022 (v1)Publication
the nuclear contamination and other passive particles in the ocean. As a consequence of the Chernobyl accident (April, 26th, 1986), the radioactive plume drift over many countries in Europe, and after some days, the Baltic Sea became the most contaminated ecosystem beyond the Soviet Union. Our Dispersion Model has been validated in this...
Uploaded on: March 24, 2023 -
September 6, 2022 (v1)Publication
The incision Zanclean Channel, which crosses the Strait of Gibraltar and the Alboran Sea, has been inter-preted as the geological fingerprint of a cataclysmic stream of water which flowed from the Atlantic into a desiccated Mediterranean about 5.33MaBP. The mathematical support for this theory is provided by a simple conceptual model for...
Uploaded on: December 4, 2022 -
October 6, 2022 (v1)Publication
Most 210Pb dating models assume that atmospheric flux of excess 210Pb (210Pbexc) to the sediment–water interface remains constant over time. We revisited this assumption using statistical analysis of a database of laminated sediments and evaluated the implications for radiometric dating of recent deposits. A bibliographic survey enabled us to...
Uploaded on: December 4, 2022 -
September 9, 2022 (v1)Publication
This work reports results from numerical simulations of the tsunami triggered by 1995 Nuweiba earthquake, in the Gulf of Aqaba, which are consistent with the available observations. A series of 12 potential tsunamigenic sources are then considered in the Red Sea: related to major submarine earthquakes; volcanism (entry of pyroclastic flows and...
Uploaded on: March 24, 2023 -
September 2, 2022 (v1)Publication
A numerical model which simulates the propagation of tsunamis in the Eastern Mediterranean has been developed. Several tsunami sources have been considered: earthquakes associated to geological faults, submarine landslides, entry of pyroclastic flows into the sea and the collapse of a volcano caldera. The model has been applied to different...
Uploaded on: March 25, 2023 -
September 29, 2016 (v1)Publication
The reliability of the narrative of the Biblical Exodus has been subject of heated debate for decades. Recent archaeological studies seem to provide new insight of the exodus path, and although with a still controversial chronology, the effects of the Minoan Santorini eruption have been proposed as a likely explanation of the biblical plagues....
Uploaded on: March 27, 2023