Katie Adler
@katherine-adler.bsky.social
Postdoc in Mechanical Engineering at the University of New Hampshire (views are my own). PhD from Cornell University.
If you're researching nearshore sediment transport, please consider submitting an abstract to the #AGU Ocean Sciences Meeting 2026 session, CP012: Sediment Transport in the Nearshore Ocean: Insights from Field, Laboratory, and Numerical Experiments. agu.confex.com/agu/osm26/pr...
July 21, 2025 at 9:41 PM
If you're researching nearshore sediment transport, please consider submitting an abstract to the #AGU Ocean Sciences Meeting 2026 session, CP012: Sediment Transport in the Nearshore Ocean: Insights from Field, Laboratory, and Numerical Experiments. agu.confex.com/agu/osm26/pr...
Impressive hummingbird aerodynamics in Durham, NH. They beat their wings at around 40 Hz (this is a Live Photo, so not very high frame rate). Check this link for a fun fact about hummingbirds from @nicolesharp.com
fyfluiddynamics.com/2021/05/how-...
fyfluiddynamics.com/2021/05/how-...
July 9, 2025 at 6:51 PM
Impressive hummingbird aerodynamics in Durham, NH. They beat their wings at around 40 Hz (this is a Live Photo, so not very high frame rate). Check this link for a fun fact about hummingbirds from @nicolesharp.com
fyfluiddynamics.com/2021/05/how-...
fyfluiddynamics.com/2021/05/how-...
I saw a relevant exhibit in the Natural History Museum in London today. They have lithified sand ripples, one set formed by waves and one by current.
June 15, 2025 at 8:59 PM
I saw a relevant exhibit in the Natural History Museum in London today. They have lithified sand ripples, one set formed by waves and one by current.
Happy late #FlumeFriday. Here is a top view of sand ripples formed in the EFWT at UNH using oscillations of an amplitude 8 cm and a period of 2 s. The distance between ripple crests is about 6 cm and the sand is fine (median gran size is around 0.2 mm). these ripples affect coastline evolution.
June 14, 2025 at 10:03 AM
Happy late #FlumeFriday. Here is a top view of sand ripples formed in the EFWT at UNH using oscillations of an amplitude 8 cm and a period of 2 s. The distance between ripple crests is about 6 cm and the sand is fine (median gran size is around 0.2 mm). these ripples affect coastline evolution.
Happy #FlumeFriday! I started making sand ripples in the environmental flows water tunnel at #UNH. The oscillatory flow pushes the sand at the crests back and forth and creates vortices downstream (leeward side) of the ripples.
February 1, 2025 at 1:19 AM
Happy #FlumeFriday! I started making sand ripples in the environmental flows water tunnel at #UNH. The oscillatory flow pushes the sand at the crests back and forth and creates vortices downstream (leeward side) of the ripples.
A nearby example at a different angle to the wind.
December 9, 2024 at 1:10 AM
A nearby example at a different angle to the wind.
For #FlumeFriday, here are sand ripples (aka ridges, ribbons, or waves) at Ludington, MI. They form due to the orbital flow under waves. They can also form due to current-driven eddies, like in rivers, but current-formed ripples tend to be less regular and less symmetrical.
January 31, 2025 at 4:39 AM
For #FlumeFriday, here are sand ripples (aka ridges, ribbons, or waves) at Ludington, MI. They form due to the orbital flow under waves. They can also form due to current-driven eddies, like in rivers, but current-formed ripples tend to be less regular and less symmetrical.
Flexible vegetation generates ripples (i.e., capillary-gravity bow waves) as water flows by in a stream in #VallesCaldera National Preserve, New Mexico.
January 31, 2025 at 4:39 AM
Flexible vegetation generates ripples (i.e., capillary-gravity bow waves) as water flows by in a stream in #VallesCaldera National Preserve, New Mexico.
A #beaver dove under our measuring tape while a group of us from the Center for Ecohydraulics Research (UIdaho) collected data at a #riverrestoration site near La Grande, OR.
January 31, 2025 at 4:39 AM
A #beaver dove under our measuring tape while a group of us from the Center for Ecohydraulics Research (UIdaho) collected data at a #riverrestoration site near La Grande, OR.
Bow waves from the DeFrees Lab for #FlumeFriday. (Left) from iPhone 12. (Right) from Zyla 5.5 sCMOS camera. The right image was using 16-bit setting rather than 12-bit, so smoother transitions between intensity levels (smaller quantization step) but lower fps and bigger file.
January 31, 2025 at 4:39 AM
Bow waves from the DeFrees Lab for #FlumeFriday. (Left) from iPhone 12. (Right) from Zyla 5.5 sCMOS camera. The right image was using 16-bit setting rather than 12-bit, so smoother transitions between intensity levels (smaller quantization step) but lower fps and bigger file.
Pictures of the ferry and the harbor protected by the breakwaters
January 31, 2025 at 4:39 AM
Pictures of the ferry and the harbor protected by the breakwaters
After a ferry approaches #mackinacisland, some of the bow #waves generated by its high speed are reflected off the rubble breakwater and overlap with incident waves leading to interesting breaking patterns near shore.
January 31, 2025 at 4:39 AM
After a ferry approaches #mackinacisland, some of the bow #waves generated by its high speed are reflected off the rubble breakwater and overlap with incident waves leading to interesting breaking patterns near shore.
A beautiful day for #fieldwork with Dr. Seth Schweitzer. #fieldresearch
January 31, 2025 at 4:39 AM
A beautiful day for #fieldwork with Dr. Seth Schweitzer. #fieldresearch
Another hydraulic jump in Ithaca, NY on #flumefriday. A hydraulic jump occurs when water goes from a shallow, fast (supercritical) area to a deeper, slower (subcritical) area. The critical velocity and depth are reached when Froude number is at unity: v/(gh)^.5=1.
January 31, 2025 at 4:38 AM
Another hydraulic jump in Ithaca, NY on #flumefriday. A hydraulic jump occurs when water goes from a shallow, fast (supercritical) area to a deeper, slower (subcritical) area. The critical velocity and depth are reached when Froude number is at unity: v/(gh)^.5=1.
There are 2 banded #Cloud generation mechanisms and both are related to my research: 1) bands form parallel to the wind due to roller vortices (left image observed today) 2) bands form perpendicular to wind due to gravity waves, like in front of a boat (right image from today).
January 31, 2025 at 4:38 AM
There are 2 banded #Cloud generation mechanisms and both are related to my research: 1) bands form parallel to the wind due to roller vortices (left image observed today) 2) bands form perpendicular to wind due to gravity waves, like in front of a boat (right image from today).
I saw melting #water flowing under ice. The time during which the water is in the camera field of view depends on how steep or how tortuous the water’s path is. #hydrology.
January 31, 2025 at 4:38 AM
I saw melting #water flowing under ice. The time during which the water is in the camera field of view depends on how steep or how tortuous the water’s path is. #hydrology.
More standing waves and a small hydraulic jump here in Ithaca
January 31, 2025 at 4:38 AM
More standing waves and a small hydraulic jump here in Ithaca
I saw banded #clouds again. It looks like internal gravity waves (IGW) formed because stably stratified air at the stratocumulus cloud layer was disturbed by an updraft, for example. IGW transport momentum and energy. What can the clouds near you tell you about atmospheric flows?
January 31, 2025 at 4:37 AM
I saw banded #clouds again. It looks like internal gravity waves (IGW) formed because stably stratified air at the stratocumulus cloud layer was disturbed by an updraft, for example. IGW transport momentum and energy. What can the clouds near you tell you about atmospheric flows?
Wave trains can form leeward of obstacles in open channel flow (Left: 6-cm-wide flume at #FDSE. Right: Hermit rapids in the Grand Canyon has 10 waves.) They appear stationary because they propagate at the speed of the mean flow, like running on a tread mill #FlumeFriday
January 31, 2025 at 4:37 AM
Wave trains can form leeward of obstacles in open channel flow (Left: 6-cm-wide flume at #FDSE. Right: Hermit rapids in the Grand Canyon has 10 waves.) They appear stationary because they propagate at the speed of the mean flow, like running on a tread mill #FlumeFriday
Thanks, Jack Powers, for helping us get the long-stroke wave tank running on this #FlumeFriday (see slo-mo video below). The way shoaling waves break depends on the beach slope, wave height, and wavelength in deep water (i.e. the Iribarren number).
January 31, 2025 at 4:37 AM
Thanks, Jack Powers, for helping us get the long-stroke wave tank running on this #FlumeFriday (see slo-mo video below). The way shoaling waves break depends on the beach slope, wave height, and wavelength in deep water (i.e. the Iribarren number).
Thank you NYS Hemlock Initiative for inviting Ian Kranz and me to share our phenology video at your open house. It's great to learn more about #HWA and how it's impacting the local community. The video, made with help from @CornellEngComm & @FLLandTrust as well, coming soon.
January 31, 2025 at 4:36 AM
Thank you NYS Hemlock Initiative for inviting Ian Kranz and me to share our phenology video at your open house. It's great to learn more about #HWA and how it's impacting the local community. The video, made with help from @CornellEngComm & @FLLandTrust as well, coming soon.