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#geomorphometry

3 posts1 participant0 posts today
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💧🌏 Greg Cocks

Kinematic Evolution Of A Large Paraglacial Landslide In The Barry Arm Fjord Of Alaska
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doi.org/10.1029/2023JF007119 <-- shared paper
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doi.org/10.5066/P9EUCGJQ <-- shared technical article
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sciencebase.gov/catalogMaps/ma <-- shared web mapping service
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#GIS #spatial #mapping #massmovement #landslide #engineeringgeology #remotesensing #sitespecific #LiDAR #iFSAR #paraglacial #kinematics #mapping #monitoring #spatialanalysis #spatiotemporal #fedscience #risk #hazard #glacier #retreat #climatechange #Alaska #BarryArm #fjord #hazardassessment #tsunami #wave #BarryGlacier #change #sensors #fieldwork #surveillance #melting #permafrost #Whittier #geophysics #geology #Alaska #geomorphometry #deglaciating
@USGS

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💧🌏 Greg Cocks

Fluvial System Block Diagrams
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I was looking to understand a fluvial system the other day, up in the high Arctic, as I looked at 3DEP remote sensed elevation data… I have always been fascinated by the how geology, water, weather shapes a landscape, including erosion (aka geomorphology if you will) – and realized how very much value fluvial block diagrams have as we try to conceptualise what has, is and will happen(ed.)
#spatial #spatiotemporal #morphology #meander #levee #understanding #oxbow #pointbar #river #water #hydrology #landform #geomorphology #geomorphometry #geology #fluvial #riverine #weather #climate #erosion #sediment #sedimentation #Arctic #3dep #opendata #DEM #BeringSea #northslope #opendata #fedservice

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💧🌏 Greg Cocks

Multispectral Remote Sensing Expression of Lineaments and Alteration Minerals in Part of Crystalline Rock Units of Southwestern Nigeria - Implication on Gold Prospecting
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doi.org/10.1016/j.oreoa.2025.1 <-- shared paper
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#GIS #spatial #mapping #ASTER #Gold #Hydrothermal #HydrothermalAlteration #Lineament #Landsat #ETM #EnhancedThematicMapper #phyllic #Ilesha #schist #belt #geology #mining #Nigeria #naturalresources #mineral #mineralresources #golddeposits #aerogeophysical #remotesensing #geophysical #spatialanalysis #geomorphology #geomorphometry #alteration #propylitic #argillic #mineralogy #XRD #structuralgeology #lithology #PrincipalComponentAnalysis #PCA #prospecting #fracture #joints #faulting #Multispectral #Lineaments #Crystalline

aerial oblique image - existing gold mine, Nigeria
geology/geomorphology map - Showing VES Positions Overlay on Mineral Prospective Map
(a) Lineament Map of the Study Area (b) Lineament Density Map of the Study Area (c) Superposition of Lineament on Geology Map of the Study Area
maps of remote sensing data - (a) Composite (RGB) 7, 5, 2 Image of the Study Area (b) Composite (RGB) 3, 2, 1 Image of the Study Area (c) Composite (RGB) 4, 3, 1 Image of the Study Area (d) Composite (RGB) 3, 2, 1 Image of the Study Area
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💧🌏 Greg Cocks

Scientists Uncover Evidence Of A Colossal MegaFlood That Refilled The Mediterranean Sea
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scitechdaily.com/scientists-un <-- shared technical article
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doi.org/10.1038/s43247-024-019 <-- shared paper
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#GIS #spatial #mapping #remotesensing #Zanclean #megaflood #flood #flooding #Mediterranean #MediterraneanSea #MessinianSalinityCrisis #italy #sicily #spatialanalysis #erosion #geology #engineeringgeology #naturaldisaster #sedimentation #deposition #ridge #morphology #geomorphology #geomorphometry #spatialanalysis #model #deposits #breccia #sediment #softsediment #geologichistory #seismology #geophysics #seismics #geophysical #pleistocene #hydrodynamic #model #water #hydrology

charts, photo & map - Ridge morphology
photo and 3D image/map - ridge outcrops
image - artistic interpretation of the flooding of the Mediterranean through the Strait of Gibraltar (A) and the Strait of Sicily (F) about 5.3 million years ago
seismic profiles and map - Buried erosional shelf channels upslope of Noto Canyon
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💧🌏 Greg Cocks

Edge Of Mars’ Great Dichotomy Eroded Back By Hundreds Of Kilometres
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arstechnica.com/science/2025/0 <-- shared technical article
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dx.doi.org/10.1038/s41561-024- <-- shared paper
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#GIS #spatial #mapping #planet #Mars #remotesensing #imagery #landsurface #geology #topography #astrogeology #elevation #morphology #martian #geography #marsdichotomy #plateau #lowlands #model #3dmodel #basin #highlands #shoreline #ocean #crust #structuralgeology #chemostratigraphy #morphostratigraphy #geomorphometry #geomorphology #water #hydrology #CaSSIS #HiRISE #stratigraphy #strata #MOLA #laser #LiDAR #MawrthVallis #crater #mound #profile #crosssection #geochemistry #mineralogy #CRISM #CTX #HRSC #DTM #erosion #weathering #spatialanalysis #spatiotemporal

images - Morphological similarities between the stratigraphy in the mounds and the Mawrth Vallis plateau region
3D model, map, images and charts - Chemostratigraphy and morphostratigraphy of a well-exposed mound
3D map and cross section - Three-dimensional view of study area with stacked elevation profiles
image/map - the topography of Mars by the Mars Orbital Laser Altimeter (MOLA)
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💧🌏 Greg Cocks

I have been digging out my old copies of John McPhee's #books, dipping in, remembering what it was like to be a new #geologist, and how it has carried across into #spatial #data, #geomorphology, #geomorphometry, #hydrology, #landcover, #engineeringgeology, #environmentalscience, #landuse, #massmovement and so much more......
This one paragraph reminded me so strongly of that time,, although I cannot of course write as eloquently:
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"I used to sit in class and listen to the terms come floating down the room like paper airplanes. Geology was called a descriptive science, and with its pitted outwash plains and drowned rivers, its hanging tributaries and starved coastlines, it was nothing if not descriptive. It was a fountain of metaphor—of isostatic adjustments and degraded channels, of angular unconformities and shifting divides, of rootless mountains and bitter lakes..."
#GIS #JohnMcPhee #science #scientificwriting #readingforpleasure #geology #water #landforms #spatialanalysis #spatiotemporal

Book cover - Basin & Range, John McPhee
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💧🌏 Greg Cocks

Postfire Debris-Flow Hazards
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usgs.gov/programs/landslide-ha <-- shared technical article / overview
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alturl.com/po3yj <-- USGS Post-Fire Debris Flow Hazard Assessment Viewer
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earthquake.usgs.gov/arcgis/res <-- Post-Fire Debris-Flow Hazards USGS spatial data / GIS Services
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#GIS #spatial #mapping #USGS #LandslideHazardsProgram #NaturalHazards #3DEP #NGP #NationalGeospatialProgram #GIRT #GeospatialInformationResponseTeam #GIS #geology #hydrospatial #hydrology #landslides #debrisflows #fires #postfire #lidar #elevationdata #hazardassessments #preparedness #massmovement #engineeringgeology #risk #hazards #impacts #cost #economics #geomorphology #geomorphometry #spatialanalysis #spatiotemporal #remotesensing #soil #model #modeling #LosAngeles #LA #LosAngelesfires #California #wildfires #opendata
@USGS

photo - A home damaged by the January 9, 2018 debris flow event in Montecito, California. The event was triggered by heavy rain on the Thomas Fire burn area above Montecito. This home is located near Buena Vista Creek.
screen shot centered on LA - USGS Post-Fire Debris Flow Hazard Assessment Viewer (web map)
photo - Debris Flow in Cable Canyon following the 2003 Old Fire in the San Bernardino Mountains, California
photo - Post-fire debris flow depositing ash and sediment on a steep hillside, 2021 Dixie Fire in northern CA
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💧🌏 Greg Cocks

'Some (TopoBathy) Floodplain Images I Made A Few Years Ago, On The Mississippi R.
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These are some (topobathy) floodplain images I made a few years ago for a specific usecase – and ‘stumbled’ across them again today, lookin’ for something else…
Every time I look at such things, the (engineering) geologist, geomorphologist, (pseudo) hydrologist, spatial data scientist in me is made happy in being reminded what access we have to (often open) spatial data and the sheer volume of it, and the use cases for which it can be leveraged.
We are lucky professionals…
#GIS #spatial #mapping #alldataisspatial #remotesensing #geomorphology #hydrology #water #floodplain #usecase #opendata #LiDAR #geology #geomorphometry #spatialdata #happyprofessional #MississippiRiver #JALBTCX

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💧🌏 Greg Cocks

Vortex Trapping Of Suspended Sand Grains Over Ripples
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doi.org/10.1029/2023JF007620 <-- shared paper
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“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
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💧🌏 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
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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
💧🌏 Greg Cocks

A Crew Was Searching For Shipwrecks In Lake Michigan—But They Found Something Completely Different
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popularmechanics.com/science/e <-- shared media / technical article
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“ • A survey of Lake Michigan located at least 40 large craters on the lakebed.
• Initial studies highlighted the spots as unknown shapes, but additional research revealed the craters are filled with marine life.
• Researchers expect to investigate further, seeing how these craters formed and if they’re really sinkholes…"
#GIS #spatial #mapping #water #hydrology #groundwater #crater #sinkhole #bathymetry #topobathy #remotesensing #sonar #LakeMichigan #Michigan #research #GreatLakes #geomorphology #geomorphometry #ROV #ecology #ecosystems #cyanobacteria #WisconsinShipwreckCoastNationalMarineSanctuary #Sheboygan #Wisconsin #extremeecosystems #extremophiles #offgassing #hydrocarbons
@NOAA

A sonar image of a few of the sinkholes found at the bottom of Lake Michigan. Earlier this month, scientists with the National Oceanic and Atmospheric Administration Great Lakes Environmental Research Laboratory confirmed that circular depressions discovered in 2022 were in fact sinkholes. More than 40 have been found roughly 14 miles southeast of Sheboygan in the Wisconsin Shipwreck Coast National Marine Sanctuary.
A diver investigates the purple-colored cyanobacterial mats at the bottom of Lake Huron's Middle Island sinkhole. Discovered in 2010, Lake Huron's sinkholes have been a hotbed for research ever since.
Purple-hued cyanobacterial mats cover much of the bottom of Lake Huron's Middle Island sinkhole. Discovered in 2010, Lake Huron's sinkholes have been a hotbed for research ever since. The finger-like forms are caused by gases bubbling up underneath the mat.
Researchers from the National Oceanic and Atmospheric Administration Great Lakes Environmental Research Laboratory prepare to deploy a remotely operated vehicle to explore the newly discovered sinkholes in the Wisconsin Shipwreck Coast National Marine Sanctuary. More than 40 sinkholes were discovered 14 miles southeast of Sheboygan in the sanctuary.
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