Trending
Jessica Marggraf's Avatar

Jessica Marggraf

@jessicamarggraf

Postdoc at the University of Minnesota, St. Anthony Falls Laboratory | Interested in fluvial geomorphology, sediment dynamics and their measurement techniques, bedrock river erosion

237
Followers
260
Following
13
Posts
23.11.2024
Joined
Posts Following

Latest posts by Jessica Marggraf @jessicamarggraf

Seminar announcement.

Seminar announcement.

Frozen Lake Superior at Duluth

Frozen Lake Superior at Duluth

It was a pleasure to give the seminar at the Department of Earth and Environmental Sciences at the University of Minnesota Duluth! I also enjoyed meeting and discussing with faculty and students.

08.02.2026 16:31 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Post image Post image

I am seeking a postdoctoral researcher for a USGS project. See below for details!

22.07.2025 22:43 πŸ‘ 4 πŸ” 1 πŸ’¬ 1 πŸ“Œ 1
Preview
Tipping Point I The Mighty Mississippi I A PBS News Special Hosted at SAFL TheΒ St. Anthony Falls Laboratory was the setting forΒ Tipping Point: The Mighty Mississippi.Β This live News Hour featured many experts who spoke about the power of the Mississippi River as well problem...

Watch the live news hour here!
cse.umn.edu/safl/news/ti...

#stanthonyfalls

18.07.2025 18:23 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Video thumbnail

Check out this time-lapse video of waves eroding an ice front from an experiment conducted in our cryogenic wave tank at the University of Wisconsin-Madison. The tank is housed in a walk-in freezer, and the waves are precisely controlled. This video captures about an hour of wave erosion.

16.07.2025 14:17 πŸ‘ 59 πŸ” 11 πŸ’¬ 5 πŸ“Œ 0
Post image

I'm excited to start the sample preparation for cosmogenic dating at the University of Cincinnati! We'll be following the procedure of @erraticscience.bsky.social to use 36Cl on whole rock basalt on our 1.1. Ga old samples from the Lake Superior basin. πŸ§ͺπŸ‘©β€πŸ”¬

βœ”οΈ Etching the samples in nitric acid.

09.07.2025 17:03 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Post image Post image Post image Post image

Back from the field! We've been collecting samples for cosmogenic radionuclide dating using 36Cl on whole rock. We're interested in fluvial incision and waterfall retreat rates in the Western Lake Superior Basin. This is also a beautiful study site with Temperance, Gooseberry and Cascade Rivers!

20.06.2025 22:45 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Post image

First day of sample preparation for cosmogenic dating. We're starting with crushing, milling and sieving the sample material.

14.06.2025 00:58 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Also, the Michigan Geological Survey started recently a large mapping project on the Upper Peninsula in view of sand and gravel resources. Mapped features will include major glacial, fluvial and coastal landforms at 1:24k scale!

13.06.2025 01:28 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I also heard many insightful talks about the glacial lake outburst floods, strandlines of paleo Lake Superior, eskers and the fluvial sediment budget of Minnesota point.

13.06.2025 01:16 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Post image Post image Post image

Today was the first day of our annual NSF funded project on the Lake Superior Basin. I presented my work on the lithological controls on erosion processes in bedrock rivers and the fluvial geomorphology on the North Shore. πŸžοΈπŸŒŠπŸ”οΈπŸ§Š

13.06.2025 01:14 πŸ‘ 12 πŸ” 1 πŸ’¬ 3 πŸ“Œ 0
Post image Post image

This week, I attended the @csdms.bsky.social annual meeting, where I presented my work on the control of lithological properties on bedrock river erosion, using field and flume measurements. I enjoyed this meeting with great keynote talks, lots of time for interaction and daily workshops! πŸžοΈπŸ’»

18.05.2025 01:06 πŸ‘ 5 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Post image

Happy to see @stanthonyfallslab.bsky.social here! I'm looking forward to seeing more of our amazing research! 🏞️🌊

22.04.2025 12:09 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Dalles of the St. Croix River

Dalles of the St. Croix River

Minnehaha Falls

Minnehaha Falls

The Mississippi and its floodplain close to Redwing, MN

The Mississippi and its floodplain close to Redwing, MN

Frozen Mississippi in Minneapolis

Frozen Mississippi in Minneapolis

Happy #WorldWaterDay!

22.03.2025 15:27 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Post image

⚠️ DEADLINE EXTENSION⚠️

Deadline extended to WEDNESDAY 12th FEBRUARY to present your research at the next SedsOnline student webinar on Wednesday 26th February!

No need to prepare a proper abstract, just answer 3 short questions about your methodology, research aims, results & interpretations!

30.01.2025 15:24 πŸ‘ 5 πŸ” 7 πŸ’¬ 0 πŸ“Œ 0
A promotional image for AGU EPSP's Zoom Coffee Hour featuring December and January early career spotlights Shayla Triantafillou and Karin Lehnigk, scheduled for January 29th at 2pm ET and 11am PT. The design includes a QR code for registration, an illustrated coffee cup, and decorative curved shapes in rust red against a cream background.

A promotional image for AGU EPSP's Zoom Coffee Hour featuring December and January early career spotlights Shayla Triantafillou and Karin Lehnigk, scheduled for January 29th at 2pm ET and 11am PT. The design includes a QR code for registration, an illustrated coffee cup, and decorative curved shapes in rust red against a cream background.

β˜•οΈ New year, new Coffee Hour! Connect with AGU EPSP's featured early career researchers Shayla Triantafillou and Dr. Karin Lehnigk on Wednesday, January 29th at 14:00 NYC, 11:00 San Francisco.

Register through QR code or at: forms.gle/v5k8Qy8sG5Pp...

24.01.2025 22:17 πŸ‘ 3 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
Two people discussing a scientific poster

Two people discussing a scientific poster

Go check out Marijke's poster! 1538
#Turbulence, turbidity currents, #mud
#FlumeFriday #AGU24

13.12.2024 19:28 πŸ‘ 6 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
Post image Post image

Getting ready for #AGU and doing the last revisions for my elightening presentation on Friday! Super excited to attend AGU for the first time!

07.12.2024 18:28 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Post image

Did you feel it? Report your experience here earthquake.usgs.gov/earthquakes/...

05.12.2024 20:58 πŸ‘ 7 πŸ” 4 πŸ’¬ 0 πŸ“Œ 0

I would love to be added! Thanks for organising this!

23.11.2024 18:57 πŸ‘ 1 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
Preview
River suspended-sand flux computation with uncertainty estimation using water samples and high-resolution ADCP measurements Abstract. Measuring suspended-sand fluxes in rivers remains a scientific challenge due to their high spatial and temporal variability. To capture the vertical and lateral gradients of concentration in...

Check out our new paper on suspended sand concentration computation and uncertainty estimation in the cross-section! esurf.copernicus.org/articles/12/...

23.11.2024 18:27 πŸ‘ 9 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0