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#sedimentology

1 post1 participant0 posts today
Public
Emilia Jarochowska 🇺🇦🌱

As we watch a lot of funding for #research being cut, affecting vital projects and driving many talents away, I can't help seeing #academic #conferences as inappropriately decadent. Random example: this conference has an entire subpage about #sustainability: confer.co.nz/isc2026/ Does it mean #hybrid, you might ask? No. You fly to New Zealand, and pay an extra 400 - 6500 NZD if you want to attend a field trip: nearly a year's worth of a PhD student bursary in Poland. Who has this money in #sedimentology? Mostly researchers in the #fossilfuels industry.
Am I interested in the scientific content of the conference? Yes.
Am I ashamed by how sustainably and inclusively it is delivered? Also yes. I wish we scientists weren't so tone deaf sometimes.
#NicheRant #AskingForIt

Public
Bibliolater 📚 📜 🖋

🔴 **Evidence of the Zanclean megaflood in the eastern Mediterranean Basin**

“_Our findings provide evidence for a large amplitude drawdown in the Ionian Basin during the MSC, support the scenario of a Mediterranean-wide catastrophic flood at the end of the MSC, and suggest that the identified sedimentary body is the largest known megaflood deposit on Earth._”

Micallef, A., Camerlenghi, A., Garcia-Castellanos, D. et al. Evidence of the Zanclean megaflood in the eastern Mediterranean Basin. Sci Rep 8, 1078 (2018). doi.org/10.1038/s41598-018-194.

#OpenAccess #OA #Article #DOI #Geology #Geomorphology #Geophysics #Sedimentology #Flood #Mediterranean #Academia #Academics @geology

Public
Planetary Ecologist

Manning formula (Hydrology 💧)

The Manning formula or Manning's equation is an empirical formula estimating the average velocity of a liquid in an open channel flow. However, this equation is also used for calculation of flow variables in case of flow in partially full conduits, as they also possess a free surface like that of open channel flow. All flow in so-called...

en.wikipedia.org/wiki/Manning_

en.wikipedia.orgManning formula - Wikipedia
#ManningFormula#Piping#Hydrology
Public *
💧🌏 Greg Cocks

Groundwater Pumping Drives Rapid Sinking In California
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thehill.com/policy/energy-envi <-- shared media article
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phys.org/news/2024-11-groundwa <-- shared technical article
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doi.org/10.1038/s43247-024-017 <-- shared paper
--
#GIS #spatial #mapping #remotesensing #radar #insar #satellite #change #spatialanalysis #spatiotemporal #water #hydrology #subsidence #california #USA #imperialvalley #SanJoaquinValley #groundwater #pumping #mining #waterresources #watersecurity #watermanagement #geology #sedimentology #risk #hazard #damage #infrastructure #canal #aqueduct #aquifer #recharge #drought #extremeweather #climatechange #agriculture #irrigation #elevation #impacts #well #ditches #watersupply #waterquality #flood #flooding #cost #economics #nonreversible

chart - Summary figure showing the calculated time series of Valley-wide subsidence volume
chart and maps - Temporal coverage of InSAR data, and the subsidence patterns they reveal, in the San Joaquin Valley
maps - Comparison of interpolated subsidence maps with extensometer and levelling survey data
photos - showing metrics for subsidence related to groundwater extraction at different times, San Joaquin Valley and related, CA
Public *
💧🌏 Greg Cocks

Vortex Trapping Of Suspended Sand Grains Over Ripples
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doi.org/10.1029/2023JF007620 <-- shared paper
--
“KEY POINTS
• Observations of vortex-trapped grains suggest delayed settling of advected grains, as well as delayed advection of grains mobilized from the bed
• Quantitative comparisons of vortex-trapped sand grains compared well with theoretical formulations by Nielsen (1992, doi.org/10.1142/1269) for a forced vortex
• Improved understanding of vortex trapping effects on sediment dynamics may decrease uncertainty in large-scale coastal model predictions..."
#spatial #model #modeling #water #hydrology #hydrodynamics #vortex #sand #sediment #transport #sedimentation #sedimentology #morphodynamics #fluiddynamics #ripples #coast #coastal #research #velocimetry #suspension #experimentation #dynamics #geology #processes #geomorphology #geomorphometry #vortextrapping #sand #grains #flow #ripple #sandwaves #ripples

Illustration of the vortex core (blue arrows) distinct from the boundary shear and background turbulence (gray arrows) along the sand ripple. The black streamline indicates the freestream flow direction at this time step while the vortex is developing along the ripple slope. The double-headed arrow indicates that the free-stream velocity is oscillatory.
photo - experimental setup of particle image and tracking velocimetry system in the Small-Oscillatory Flow Tunnel at the United States Naval Research Laboratory at Stennis Space Center, Mississippi, United States of America. Three high-speed cameras and a downward-looking Neodymium-doped yttrium aluminum garnet (Nd:YAG) laser were aimed at the test section of the rippled sand bed.
charts / figures - Vorticity and grain trajectories. (a) Freestream horizontal velocity with time steps of snapshots indicated. Instantaneous velocities are overlaid on vorticity ((b)–(g)), shown at every fourth vector, with scale vector and the brown line delineating the ripple shown. Trajectories of some vortex-trapped sediment grains are highlighted with start and end times indicated by matching triangle and square symbols in (a). Times for the semi-circular paths are indicated with circle markers. Gray circles estimate regions of highest fluid vorticity, with direction of the fluid parcels indicated by gray arrows, and quadrants of the vortex outlined.
photo - sand waves / ripples formed on the shores of Broad Bay at First Landing State Park, Virginia, USA
Public *
💧🌏 Greg Cocks

Spatial Data – Right At Your Fingertips!
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maps.app.goo.gl/yWhFvuwi4f1fRq <-- location in Google Maps, to the ESE of the Noatak National Park, Alaska
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usgs.gov/3DHP <-- 3DHP home page
--
Sometimes when you are working, you realise what a truly long way we have come in terms of readily accessible spatial data…
I am looking at remote sensed data in Alaska, both the imagery and the elevation-derived hydrology, on a pseudo-randomly-selected sand bar that maybe no one has ever stood on, just to the east of Noatak National Park – and yet I can get an excellent sense of the hydrology, sedimentology, geomorphology, even the ecology…
#GIS #spatial #mapping #remotesensing #gischat #opendata #3dhp #edh #hydrology #water #imagery #usecase #Alaska #geomorphology #geomorphometry #sedimentology
@USGS

screen shot - Google Maps - a pseudo-randomly-selected sand bar, Alaska
remote sensed images and hydrology data - a pseudo-randomly-selected sand bar, Alaska
Public
Planetary Ecologist

Matrix-supported rock (Petrology 💎)

In geology, a matrix-supported rock is a sedimentary rock of which a defined majority is the fine-grained matrix as opposed to the clasts or allochems. For a conglomerate, a rock is considered matrix-supported when clasts constitute less than 15% of its volume. Matrix support is considered characteristic of debris flow deposits, in which clasts are supporte...

en.wikipedia.org/wiki/Matrix-s

en.wikipedia.orgMatrix-supported rock - Wikipedia
#MatrixSupportedRock#Petrology#Sedimentology
Public
Or M. Bialik

Some non #MinCup24 related mineralogy.
The discussions around calcite made me think of the database of grains in sediment from my 2023 paper (nature.com/articles/s41598-023).
There is this thing we tell: aragonite is more common in the #ocean in low latitudes than in high latitudes. But I can show that with my #research !
I reprocessed the data for the shelves to show how carbonate grain mineralogy changes with latitude - for the #sedimentology classroom.

Public
💧🌏 Greg Cocks

New Zealand Has A Unique [Open Data] Fossil Record [Online Database] Named FRED
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eos.org/articles/new-zealand-h <-- shared technical article
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doi.org/10.1080/00288306.2020. <-- shared paper
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fred.org.nz/ <-- FRED’s open data online portal
--
[my ‘minor’ in my MSc Geology at the University of Auckland, NZ was in palæontology, and I have had an interest ever since; total aside – <fred.*> is what I call my temp/junk/working files, anyone else?]
#GIS #spatial #mapping #NewZealand #fossil #fossils #database #opendata #FRED #palæontology #paleontology #palaeontology #onlineportal #standards #records #publicrecords #geology #stratigraphy #sedimentology #scientifichistory #fossilrecord #samples #sampling
@gnsscience

maps - Example maps of New Zealand mainland (>73,000 localities), Raukumara Peninsula (>13,000 localities), and detail of Mahia Peninsula (212 localities), to illustrate the density and distribution of fossil localities recorded in the Fossil Record File.
screen shot - Several different query facilities are provided by the FRED interface into the FRF, the most comprehensive of which is the ‘Advanced Query’. The figure depicts a partially populated Advanced Query search screen. Search fields are grouped into various categories (locality, stratigraphy, taxonomic, etc.) and a selection of operators (equals, contains, numeric inequalities, etc.) to allow a series of Boolean statements to be constructed. Full instructions are provided in the on-line user manual.
graphic - reconstruction of an example of a New Zealand marine reptiles as seen in the fossil record
photos - Left – Two of the most common fossil taxa recorded in the Fossil Record File, a rimu pollen grain, Dacrydium cupressinum (top; scale bar = 20 μm) and the foraminifer Globoquadrina dehiscens (bottom; scale bar = 200 μm). Right (stereo pair) – One of the rarest taxa recorded, the mosasaur Rikisaurus tehoensis (V19/f0068; scale bar = 200 mm). The microfossils have each been recorded more than 5000 times; the mosasaur only once.
Public
Emilia Jarochowska 🇺🇦🌱

Many people think the history of the Earth is hard to decipher. The geological record jumbles everything up. We set out to fact-check this in my ERC Starting Grant MindTheGap. Focusing on the mode of evolution, because that is something that we can only glean from long records, longer than anything accessible to observation or experimentation today.

Thanks to collaboration with Peter Burgess we used forward models to simulate formation of carbonate rocks and see how completeness and stratigraphic resolution affect the reconstructions. Guess what! The geological record is 👌🏻 With a bit of understanding of #sedimentology and #physics we can test is with computer experiments and it turns out even very patchy rock strata will let us reconstruct the correct mode of evolution. This opens a lot of possibilities, especially for the #microfossil community: your data is priceless to understand #microevolution.

Check out the results at lnkd.in/eeiSuRwP

Also a big shoutout to an excellent review process at PCI Paleo, the thoughtful editors and reviewers, and to the lead author Niklas Hohmann for #code #reproducibility effort that meets the most stringent standards. Check out our software at lnkd.in/eJkwhhuh

Workflow scheme for transforming example mode of evolution using an age depth model to check what it looks like under incomplete stratigraphic record
#evolution#paleontology#paleobiology
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