Lmst

USGS coastal observing camera in Nuvuk, Alaska, today. Image credit US Geological Survey / Pacific Coastal and Marine Science Center. Learn more at https://www.usgs.gov/programs/cmhrp/science/usgs-coastcams and https://www.usgs.gov/centers/pcmsc/science/using-video-imagery-study-sediment-transport-and-wave-dynamics-nuvuk-point and #interpretation #geology #usgs #publiclands #photography #landscapephotography #arctic #arcticocean #waves #alaska #research #live #sediment #color #ocean

View from a USGS coastal observing camera located in Nuvuk (Point Barrow), Alaska. The images are used to support research and to monitor coastal conditions including sea state and wave dynamics. The camera network includes locations on the Pacific and the Atlantic Ocean and from Alaska to the Gulf Coast. The colors of this image are muted - mainly whites, greys, and tans.

The Rio Grande through White Rock Canyon was an intense red-brown when I went by the Overlook a couple of days ago.

#SilentSunday #NewMexico #canyon #river #sediment

A view of a river winding through a shallow canyon, as seen from the canyon rim. The river is an intense red-brown in color. We're standing on a rocky basalt ledge, and you can see basalt boulders in the slope down to the river; on the other side it's more pale dirt eroded in badlands formations. Both sides of the river have sparse scrubs growing, juniper and sage and similar plants. At the far upstream end of the photo (top left) is a mesa, dark since it's mostly basalt, with a rounded hump on the top.

A wide panorama showing a river (the Rio Grande) going through a canyon (White Rock Canyon). We're standing on a cliff looking down at the canyon. To the left, the canyon is shallow and wide, with basalt on this side of the river and badland formations dotted with juniper/sage on the far side. Right of center, the canyon starts to narrow and show steep basalt cliffs on the far side. The water in the river is an intense red-brown color. At the far left of the image, you can see mesas both on this side of the river and on the other side. There's a mountain range in the distance, just left of and above the photo's center. The sky is clear blue with only a few small puffy clouds.

Reconstructing Ice-Margin Retreat Using Delta Morphostratigraphy
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https://doi.org/10.1038/s41598-017-16763-x <-- shared paper
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[an older paper, but fascinating - and well presented, especially the images/figures]
#GIS #spatial #mapping #icemargins #ice #delta #morphostratigraphy #paleogeography #icesheet #glacier #glacial #icesheet #glacialretreat #geology #landform #geomorphometry #geomorphology #LiDAR #engineeringgeology #remotesensing #icecontact #fluvial #water #hydrology #erosion #distal #glaciofluvial #paraglacial #sediment #deposition #quebec #canada #LaurentideIceSheet #retreat #delta #drainage #physiography #Québec

New Research Aims To Better Predict And Understand Cascading Land Surface Hazards
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https://phys.org/news/2025-06-aims-cascading-surface-hazards.html <-- shared technical article
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https://doi.org/10.1126/science.adp9559 <-- shared paper
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#interconnected #geology #engineeringgeology #landcover #landsurface #GIS #spatial #mapping #landcover #hydrology #water #geomorphology # geomiorphmetry #risk #hazard #extremeweather #climatechange #cascading #cascadinghazards #debrisflow #wildfire #massmovement #landslides #flood #flooding #mudflow #susceptibility #chainreaction #spatialanalysis #spatiotemporal #prediction #management #planning #mitigation #multifactor #sediment #erosion #fluvial #earthquake #fault #faulting #hazardassessment #riskassessment #volcano #vulcanism #sealevelchange #cryosphere #ice #snow #GLOF #humanimpacts #urban #infrastructure #cost #economics #loss #damage #earthobservation #remotesensing #LiDAR #UAV

Over the past few months, I went to two core #repositories to sample several #marine #sediment cores and meet some of my new #collaborators in person.
First, the LSCE (Laboratoire des Sciences du Climat et de l’Environnement UMR 8212) core repository in mid-April.
Second, the EPOC (Environnements et Paléoenvironnements Océaniques et Continentaux UMR 5805) core repository in early June.
Hopefully, these core repository visits would be the first of many!
#Science #ScienceMastodon #AcademicMastodon

One of the corridors of the LSCE (Laboratoire des Sciences du Climat et de l’Environnement UMR 8212) core repository. Photo taken by Nina Davtian (it’s me!).

One of the marine sediment cores—sorry, no spoiler for you today!—sampled at the LSCE (Laboratoire des Sciences du Climat et de l’Environnement UMR 8212) core repository. Photo taken by Nina Davtian (it’s me!).

One of the corridors of the EPOC (Environnements et Paléoenvironnements Océaniques et Continentaux UMR 5805) core repository. Photo taken by Nina Davtian (it’s me!).

One of the marine sediment cores—sorry, no spoiler for you today!—sampled at the EPOC (Environnements et Paléoenvironnements Océaniques et Continentaux UMR 5805) core repository—the holes show the positions of the newly picked sediment samples before plugging. Photo taken by Nina Davtian (it’s me!).

Imbrication: overlapping of sediment layers, fish scales, roof tiles, etc.

After our intense afternoon thunderstorms here in Florida, the streets abound with evidence of the deluge. Even in a land as flat as a pancake, leaves serve as the sediment imbricated by the intense rain. They have a surface area to mass ratio that is likely higher than even most clay particles, and thus they can behave this way even with relatively low slope and flow velocity. Imbrication happens in unidirectional currents and the grains organize with their upstream end higher than their downstream edge. So, in the geologic record they show us direction of ancient flows. Although formed by different processes, ripples in actual sediment can also show us direction and magnitude of ancient unidirectional flows.

All pictures taken from an alley in my neighborhood after a dousing thunderstorm.

https://en.m.wikipedia.org/wiki/Imbrication_(sedimentology)

#geology
#sediment
#sedimentology
#paleoclimatology