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#sedimentation

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Public
💧🌏 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

Study Warns Of Glacial Outburst [GLOF] Risks From Hydropower Projects In The Himalayas, Caution Comes After Nod To Resume Testa III [Hydroelectric Project, India]
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timesofindia.indiatimes.com/in <-- shared media article
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doi.org/10.1126/science.ads265 <-- shared paper
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#GIS #spatial #mapping #spatialanalysis #GLOF #Sikkim #Himalayas #India #climatechange #flood #flooding #risk #hazard #hydroelectric #HEP #energy #TestaIII #testa #dam #failure #engineeringgeology #engineering #construction #multihazard #melting #glacier #glacial #climatechange #weather #lowpressuresystem #planning #glaciallakes #lakes #water #hydrology #naturaldisaster #Lhonak #downstream #elevation #steepness #slope #geometry #infrastructure #publicsafety #lateral #moraine #sedimentation #cost #economics #remotesensing #model #modeling #imagery #outburstflood #overtopping #hydropower #vulnerable #humanimpact #policy #riskmanagement #warning #rainfall #precipitation

maps and charts - summary of damage assessment
maps and photos - Overview of the 3-4 October 2023 GLOF cascade from South Lhonak Lake, India
photos - Field evidence of sediment aggradation
photo - Teesta III hydroelectric dam soon after failure
Public
💧🌏 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
Public
💧🌏 Greg Cocks

New USGS Dataset Uncovers The Santiam River’s Underwater Topography To Aid In Fish Habitat And Water Flow Management
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usgs.gov/news/national-news-re <-- shared article
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apps.nationalmap.gov/lidar-exp <-- USGS 3DEP LiDAR Explorer (open data)
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#GIS #spatial #mapping #remotesensing #LiDAR #topobathymetry #topobathy #example #usecase #wildfires #rivermanagement #climatechange #waterresources #SantiamRiver #Oregon #KlamathRiver #PotomacRiver #ColoradoRiver #USGS #USACE #3DEP #opendata #topography #elevation #3DTNM #water #hydrology #hydrospatial #pilotproject #prototype #infrastructure #navigation #engineering #riverbed #sediment #sedimentation #habitat #river #waterbody #flowmanagement #dams #salmon #steelhead #fish #WillametteValley #flood #flooding #risk #hazard #model #modeling #FIM #watersupply #agriculture
@USGS @USACE

screen shot - 3DEP LiDAR Explorer - Santiam River, OR's topobathy dataset(s)
imagery - Topobathymetric digital elevation model of the Santiam River in the Willamette Valley southeast of Salem, Oregon. The trees and dry land are shown as a lidar point cloud colored based on aerial imagery.
drone photo - oblique - The North Santiam drains from the Cascade Range and through the Willamette Valley foothills where it combines with the South Santiam before joining the Willamette River near Salem. The river in this section has numerous gravel bars and secondary channels and is flanked by agricultural lands and floodplain forests.
map - Topobathymetric digital elevation model of the Santiam River in the Willamette Valley southeast of Salem, Oregon.
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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

Daniel Coe’s Astonishing River Cartography
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orionmagazine.org/article/dani <-- shared media article
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dancoecarto.com/work <-- his website
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[those in the spatial hydrology ‘world’ have long been incredibly impressed by Dan Coe’s imagery and cartography, here is a wonderful article on cartography & science with his visual arts quality]
“Cartographer Daniel Coe uses relative elevation data, primarily from plane-mounted lasers called lidar, to visualize Earth’s natural features, like rivers and floodplains. His stunning river maps reveal stories hidden in historical sediment and past channels carved by the water, as it twists and turns through both landscape and time…”
#GIS #spatial #mapping #DanielCoe #cartography #hydrospatial #river #riverine #imagery #representation #map #representation #science #remotesensing #LiDAR #sedimentation #flooding #riverchannel #change #spatiotemporal #gischat
#DanielCoe #fluvial #geomorphology

LiDAR-derived river cartography - Mississippi Delta, USA
LiDAR-derived river cartography - Murray River, Australia
LiDAR-derived river cartography - bends in the North Fork Shenandoah River, Virginia, USA
LiDAR-derived river cartography - Tulsequah River, British Columbia, Canada
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💧🌏 Greg Cocks

Arctic Rivers Face Big Changes With Warming Climate, Permafrost Thaw And Accelerating Water Cycle
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alaskabeacon.com/2024/03/08/ar <-- shared media article
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doi.org/10.5194/tc-18-1033-202 <-- shared paper
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#GIS #spatial #mapping #model #modeling #water #hydrology #boreal #arctic #rivers #river #change #climatechange #sedimentation #erosion #anthropogenic #warming #precipitation #rainfall #melting #permafrost #cryosphere #snow #ice #riverflow #volumes #watercycle #ecosystems #environment #Alaska #thawing #extremeweather #storms #coast #coastal #carbon #energy #weather #metrology #freezethaw #drainage #discharge #runoff #groundwater #subsurface #geology #geomorphology #spatialanalysis #spatiotemporal

aerial photo - Alaska river mouth with sedimentation /' runoff / discharge
photo - Erosion reveals ice-rich permafrost near Teshekpuk Lake, Alaska.
maps - changes in annual total and other runoff, Arctic regions
maps and charts - changes in permafrost active layer thickness, classes, etc, Arctic regions
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