Top 4 Eartharxiv Papers Today in Physical Sciences And Mathematics


2.002 Mikeys
#1. The influence of basin settings and flow properties on the dimensions of submarine lobe elements
Yvonne Spychala, Joris Eggenhuisen, Mike Tilston, Florian Pohl
Submarine lobes have been identified within various deep-water settings, including the basin-floor, the base of slope and the continental slope. Their dimensions and geometries are postulated to be controlled by the topographical configuration of the seabed, sediment supply system and slope maturity. While confinement has been suggested as a main control factor for lobe dimensions, it does not explain the spread of lobe dimensions within individual systems. Ten experiments were conducted in a 3D-flume to study the depositional characteristics of lobe associated with 1) different basin floor dipping angles (0-4°), 2) different sediment concentration of the parent turbidity current (11-19 % Vol), and 3) varying discharge (25 - 40 m3/h). Most runs produced lobate deposits that onlapped onto the lower slope independent of basin floor-dip and concentration. We determined that the deposits best describe the hierarchical level of lobe elements. Lobe element length is proportional to basin-floor angle and sediment volume concentration. A...
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IvyTheSpy: 🚨 New #preprint🚨 “The influence of basin settings and flow properties on the dimensions of submarine lobe elements” On our flume experiments in the Eurotank! cc @Moving_Sand @brit_seds https://t.co/zWTfAOWcPm
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1.978 Mikeys
#2. Commentary - Gleeson et al Groundwater in continental to global models
Tom Gleeson, Thorsten Wagener, Petra Doell, Marc Bierkens, Yoshihide Wada, Min-Hui Lo, Richard Taylor, Shams Rahman, Rafael Rosolem, Mary Hill
Continental- to global-scale hydrologic models increasingly include representations of the Earth’s groundwater system. A key question is how to evaluate the realism and performance quality of such large-scale groundwater models given limitations in data availability. We argue for a transparent approach to system conceptualization, which would enable distinguishing differences in model behavior that are caused by system conceptualization from those that are caused by differences in the implementation of physical processes in models. In addition, we argue for systematic model classification to distinguish the impacts of choices in model implementation. Evaluation options include comparing model outputs with available observations of groundwater levels or other state or flux variables (data-driven evaluation); comparing several models with each other with or without reference to actual observations (model-driven evaluation); or relying on experts to propose hydrologic behaviors that we expect to see in particular regions or at...
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1.975 Mikeys
#3. Effect of solution chemistry on the iodine release from iodoapatite in aqueous environments
ZELONG ZHANG, Léa Gustin, Weiwei Xie, Jie Lian, Kalliat T. Valsaraj, Jianwei Wang
To ensure the safe disposal of nuclear waste, understanding the release process of radionuclides retained in the nuclear waste forms is of vital importance. Iodoapatite Pb9.85(VO4)6I1.7, a potential waste form for iodine-129, was selected as a model system for ceramic waste forms in this study to understand the effect of aqueous species on iodine release. Semi-dynamic leaching tests were conducted on bulk samples in cap-sealed Teflon vessels with 0.1 mol/L NaCl, Na2CO3, Na3PO4, and Na2SO4 solutions under 90 °C, fixed sample surface area to solution volume ratio of 5/m, and periodic replacement of leaching solutions. The reacted solutions were then analyzed by Inductively Coupled Plasma-Mass Spectrometry and Inductively Coupled Plasma-Optical Emission Spectrometry; the leached surfaces were characterized by X-ray diffraction, scanning electron microscopy, and infrared spectroscopy. The result shows that, compared to deionized water, the ion-rich solutions enhanced the iodine release as a result of the increased ionic strength,...
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1.975 Mikeys
#4. On the stability of deep-seated landslides. The cases of Vaiont (Italy) and Shuping (Three Gorges Dam, China)
Carolina Segui, Hadrien Rattez, Manolis Veveakis
Deep-seated catastrophic landslides are among the most powerful natural hazards on earth. These devastating events are not possible to be prevented yet, because of their large volumes and sudden acceleration phase. The present study suggests a new method to detect when a landslide will turn unstable, giving both a time-window to evacuate the area that is going to be affected and critical values for measurable variables (velocity and basal temperature) up to which remediation measures can be deployed. This work focuses on large ancient landslides reactivated due to human interaction, like the construction of a dam in the vicinity of the landslide that causes water table variations and affects the stability of the landslide. The main hypothesis of this work is that most of the deformation of deep-seated landslides is concentrated on a thin, basal shear-band forming the sliding surface. That allows deep-seated landslides to be approximated as elastic/rigid blocks sliding over a viscoplastic shear band, featuring weak phases like...
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