Frederik Kratzert
@kratzert.bsky.social
Research Scientist @ Google Research. Working on the intersection of machine learning and hydrology. Located in Vienna, Austria.
Reposted by Frederik Kratzert
I present the most interesting graph ever made.
HUMAN ON BICYCLE beats every other living thing.
www.scientificamerican.com/article/a-hu...
HUMAN ON BICYCLE beats every other living thing.
www.scientificamerican.com/article/a-hu...
February 5, 2026 at 5:49 AM
I present the most interesting graph ever made.
HUMAN ON BICYCLE beats every other living thing.
www.scientificamerican.com/article/a-hu...
HUMAN ON BICYCLE beats every other living thing.
www.scientificamerican.com/article/a-hu...
Interesting read and something I have been thinking about recently. How fit is our education system for the new era and what does this mean for _learning_ (especially learning to learn), if students/pupils over rely on LLMs. What does this mean for my kids (2nd grade and kindergarten)...?
Last term I tried an experiment: I walked into my Tech and Design Ethics class, admitted that I had *no idea* what to do about ChatGPT - so I would let them figure it out.
As in: their first project was to decide and write the ChatGPT policy for the class.
Here's what happened:
As in: their first project was to decide and write the ChatGPT policy for the class.
Here's what happened:
January 23, 2026 at 9:46 AM
Interesting read and something I have been thinking about recently. How fit is our education system for the new era and what does this mean for _learning_ (especially learning to learn), if students/pupils over rely on LLMs. What does this mean for my kids (2nd grade and kindergarten)...?
Some updates on NeuralHydrology and I'll also use this opportunity to give a shout-out to @gauchm.bsky.social for his continuous support and maintenance of NH
New #NeuralHydrology release 🎉
Some news from v1.13.0:
* CAMELS-IND & CAMELS-DE support
* AORC hourly forcing support
* xLSTM supportSupport for embedding layers in MTS-LSTMs
...and various other improvements and fixes. The full release notes: github.com/neuralhydrol...
Thanks to all contributors!
Some news from v1.13.0:
* CAMELS-IND & CAMELS-DE support
* AORC hourly forcing support
* xLSTM supportSupport for embedding layers in MTS-LSTMs
...and various other improvements and fixes. The full release notes: github.com/neuralhydrol...
Thanks to all contributors!
Release v1.13.0 · neuralhydrology/neuralhydrology
Setup changes
As of #279, NeuralHydrology switched from using conda environments to uv. This has several advantages (e.g., it's much faster to create environments, and we'll be able to get up-to-da...
github.com
January 14, 2026 at 9:20 PM
Some updates on NeuralHydrology and I'll also use this opportunity to give a shout-out to @gauchm.bsky.social for his continuous support and maintenance of NH
Reposted by Frederik Kratzert
Are you working in large-sample hydrology?
If so, we invite you to submit an abstract to our session for EGU 2026:
HS2.4.2 "Large-Sample Hydrology: Advancing dataset developments, enhancing process understanding, and unifying insights through catchment modeling"
If so, we invite you to submit an abstract to our session for EGU 2026:
HS2.4.2 "Large-Sample Hydrology: Advancing dataset developments, enhancing process understanding, and unifying insights through catchment modeling"
October 22, 2025 at 10:44 AM
Are you working in large-sample hydrology?
If so, we invite you to submit an abstract to our session for EGU 2026:
HS2.4.2 "Large-Sample Hydrology: Advancing dataset developments, enhancing process understanding, and unifying insights through catchment modeling"
If so, we invite you to submit an abstract to our session for EGU 2026:
HS2.4.2 "Large-Sample Hydrology: Advancing dataset developments, enhancing process understanding, and unifying insights through catchment modeling"
Reposted by Frederik Kratzert
For those of you who are still undecided.
January 1, 2026 at 10:39 PM
For those of you who are still undecided.
We (wife, 7 y/o, myself) spent New Years Eve playing "Stuffed Fables"
boardgamegeek.com/boardgame/23...
My wife's first roleplay game and also the most complex game we played so far with our oldest. Time was flying and we only made it to the start of the second chapter 😅
boardgamegeek.com/boardgame/23...
My wife's first roleplay game and also the most complex game we played so far with our oldest. Time was flying and we only made it to the start of the second chapter 😅
Stuffed Fables
Live the story of a child's stuffed toys, saving her from monsters under the bed.
boardgamegeek.com
January 1, 2026 at 12:32 PM
We (wife, 7 y/o, myself) spent New Years Eve playing "Stuffed Fables"
boardgamegeek.com/boardgame/23...
My wife's first roleplay game and also the most complex game we played so far with our oldest. Time was flying and we only made it to the start of the second chapter 😅
boardgamegeek.com/boardgame/23...
My wife's first roleplay game and also the most complex game we played so far with our oldest. Time was flying and we only made it to the start of the second chapter 😅
Reposted by Frederik Kratzert
Hydrology Paper of the Day @kratzert.bsky.social on integrating water quality observations into the Caravan dataset: the need for proper metadata and processing of observations; a new river network with water quality stations; catchment delineation; and validation and flagging of suspect data.
📦 Full Data: doi.org/10.24416/UU0...
📂 Lite (CSV): zenodo.org/records/1778...
💻 Code: github.com/SustainableW...
📖Preprint: eartharxiv.org/repository/v...
#OpenScience #Hydrology #WaterQuality
📂 Lite (CSV): zenodo.org/records/1778...
💻 Code: github.com/SustainableW...
📖Preprint: eartharxiv.org/repository/v...
#OpenScience #Hydrology #WaterQuality
Caravan-Qual: A global scale integration of water quality observations into a large sample hydrology dataset - Data Publication Platform of Utrecht University
Data Publication platform of Utrecht University
doi.org
December 30, 2025 at 4:58 AM
Hydrology Paper of the Day @kratzert.bsky.social on integrating water quality observations into the Caravan dataset: the need for proper metadata and processing of observations; a new river network with water quality stations; catchment delineation; and validation and flagging of suspect data.
Interesting point. I've been thinking about this as well in the past and I think, especially with ML, we have the opportunity to optimize for what we really want to know from the model, instead of training it on some proxy task
Check out the end-of-the-year blogpost about model design by Jonathan Frame!
deepgroundwater.com/blog/what-do...
deepgroundwater.com/blog/what-do...
What does your model do? - Deep Groundwater
A collection of open-source blog posts and articles
deepgroundwater.com
December 30, 2025 at 10:13 AM
Interesting point. I've been thinking about this as well in the past and I think, especially with ML, we have the opportunity to optimize for what we really want to know from the model, instead of training it on some proxy task
Reposted by Frederik Kratzert
since everyone in Brazil's lost Twitter, I'm gonna try to make sure anything I post there is posted here too 🥲
here's a free building game I shared there a few weeks ago! mattstark.itch.io/tramstertram
here's a free building game I shared there a few weeks ago! mattstark.itch.io/tramstertram
August 31, 2024 at 8:03 PM
since everyone in Brazil's lost Twitter, I'm gonna try to make sure anything I post there is posted here too 🥲
here's a free building game I shared there a few weeks ago! mattstark.itch.io/tramstertram
here's a free building game I shared there a few weeks ago! mattstark.itch.io/tramstertram
Reposted by Frederik Kratzert
the success of the user-created For You feed while the official Discover feed flops is actually a pretty major win for Bluesky — it literally is the embodiment of their goal to decentralize feed generation and give users more control/autonomy
December 26, 2025 at 3:27 PM
the success of the user-created For You feed while the official Discover feed flops is actually a pretty major win for Bluesky — it literally is the embodiment of their goal to decentralize feed generation and give users more control/autonomy
Kid #2 got sick in time for Christmas and it seems I caught whatever he has, too. For the last three years we had at least one kid sick at Christmas.
Happy Holidays 🎄
Happy Holidays 🎄
December 23, 2025 at 7:18 PM
Kid #2 got sick in time for Christmas and it seems I caught whatever he has, too. For the last three years we had at least one kid sick at Christmas.
Happy Holidays 🎄
Happy Holidays 🎄
Reposted by Frederik Kratzert
Excited to unveil Caravan-Qual! 🌊
We've expanded the Caravan framework to bridge the gap between water quantity and quality.
This new open dataset features: 🔹 ~70M observations 🔹137k stations 🔹 100 constituents 🔹 Linked streamflow, forcing & attributes
Links in 🧵
We've expanded the Caravan framework to bridge the gap between water quantity and quality.
This new open dataset features: 🔹 ~70M observations 🔹137k stations 🔹 100 constituents 🔹 Linked streamflow, forcing & attributes
Links in 🧵
December 18, 2025 at 8:00 AM
Excited to unveil Caravan-Qual! 🌊
We've expanded the Caravan framework to bridge the gap between water quantity and quality.
This new open dataset features: 🔹 ~70M observations 🔹137k stations 🔹 100 constituents 🔹 Linked streamflow, forcing & attributes
Links in 🧵
We've expanded the Caravan framework to bridge the gap between water quantity and quality.
This new open dataset features: 🔹 ~70M observations 🔹137k stations 🔹 100 constituents 🔹 Linked streamflow, forcing & attributes
Links in 🧵
Reposted by Frederik Kratzert
@rarakihydro.bsky.social leads an exiting new preprint that maps dominant hydrologic processes across >14k US watersheds using streamflow signatures + ML. It’s been such fun following Ryoko and Hilary’s leadership alongside Admin, Anne and Gemma.
egusphere.copernicus.org/preprints/20...
egusphere.copernicus.org/preprints/20...
December 18, 2025 at 6:32 PM
@rarakihydro.bsky.social leads an exiting new preprint that maps dominant hydrologic processes across >14k US watersheds using streamflow signatures + ML. It’s been such fun following Ryoko and Hilary’s leadership alongside Admin, Anne and Gemma.
egusphere.copernicus.org/preprints/20...
egusphere.copernicus.org/preprints/20...
It is so wild how all academics seem to have decided that LinkedIn is the new platform. Essentially the same announcement receives 100x the engagement.. On a job market platform.
In the good old days of Twitter, this was different and it's kinda sad that not more researchers decided to join BlueSky
In the good old days of Twitter, this was different and it's kinda sad that not more researchers decided to join BlueSky
Excited to unveil Caravan-Qual! 🌊
We've expanded the Caravan framework to bridge the gap between water quantity and quality.
This new open dataset features: 🔹 ~70M observations 🔹137k stations 🔹 100 constituents 🔹 Linked streamflow, forcing & attributes
Links in 🧵
We've expanded the Caravan framework to bridge the gap between water quantity and quality.
This new open dataset features: 🔹 ~70M observations 🔹137k stations 🔹 100 constituents 🔹 Linked streamflow, forcing & attributes
Links in 🧵
December 18, 2025 at 5:20 PM
It is so wild how all academics seem to have decided that LinkedIn is the new platform. Essentially the same announcement receives 100x the engagement.. On a job market platform.
In the good old days of Twitter, this was different and it's kinda sad that not more researchers decided to join BlueSky
In the good old days of Twitter, this was different and it's kinda sad that not more researchers decided to join BlueSky
Excited to unveil Caravan-Qual! 🌊
We've expanded the Caravan framework to bridge the gap between water quantity and quality.
This new open dataset features: 🔹 ~70M observations 🔹137k stations 🔹 100 constituents 🔹 Linked streamflow, forcing & attributes
Links in 🧵
We've expanded the Caravan framework to bridge the gap between water quantity and quality.
This new open dataset features: 🔹 ~70M observations 🔹137k stations 🔹 100 constituents 🔹 Linked streamflow, forcing & attributes
Links in 🧵
December 18, 2025 at 8:00 AM
Excited to unveil Caravan-Qual! 🌊
We've expanded the Caravan framework to bridge the gap between water quantity and quality.
This new open dataset features: 🔹 ~70M observations 🔹137k stations 🔹 100 constituents 🔹 Linked streamflow, forcing & attributes
Links in 🧵
We've expanded the Caravan framework to bridge the gap between water quantity and quality.
This new open dataset features: 🔹 ~70M observations 🔹137k stations 🔹 100 constituents 🔹 Linked streamflow, forcing & attributes
Links in 🧵
This looks amazing 😲
Deserved first bookmark on bluesky
Deserved first bookmark on bluesky
December 4, 2025 at 10:24 PM
This looks amazing 😲
Deserved first bookmark on bluesky
Deserved first bookmark on bluesky
Reposted by Frederik Kratzert
Back by popular demand: At #EGU26 we'll organize another BUGS session: Blunders, Unexpected Glitches, and Surprises!
Submit abstracts on ideas that seemed great but didn't work, errors and bugs that led to new insights (or funny stories), or any other unexpected results.
www.egu26.eu/session/56997
Submit abstracts on ideas that seemed great but didn't work, errors and bugs that led to new insights (or funny stories), or any other unexpected results.
www.egu26.eu/session/56997
December 3, 2025 at 1:58 PM
Back by popular demand: At #EGU26 we'll organize another BUGS session: Blunders, Unexpected Glitches, and Surprises!
Submit abstracts on ideas that seemed great but didn't work, errors and bugs that led to new insights (or funny stories), or any other unexpected results.
www.egu26.eu/session/56997
Submit abstracts on ideas that seemed great but didn't work, errors and bugs that led to new insights (or funny stories), or any other unexpected results.
www.egu26.eu/session/56997
Quick shout-out for an #EGU26 session that I'm not involved in but think is worth sharing:
EOS4.4 BUGS: Blunders, Unexpected Glitches, and Surprises
For a detailed session description, see www.egu26.eu/session/56997
EOS4.4 BUGS: Blunders, Unexpected Glitches, and Surprises
For a detailed session description, see www.egu26.eu/session/56997
Session EOS4.4
www.egu26.eu
December 3, 2025 at 1:28 PM
Quick shout-out for an #EGU26 session that I'm not involved in but think is worth sharing:
EOS4.4 BUGS: Blunders, Unexpected Glitches, and Surprises
For a detailed session description, see www.egu26.eu/session/56997
EOS4.4 BUGS: Blunders, Unexpected Glitches, and Surprises
For a detailed session description, see www.egu26.eu/session/56997
What do people do when their taxi driver is a) speeding like crazy and b) interacting with his phone all the time while driving. Not sure if I'm unlucky but this happens 4/5 times to me when taking the airport taxi back home...
November 20, 2025 at 10:27 PM
What do people do when their taxi driver is a) speeding like crazy and b) interacting with his phone all the time while driving. Not sure if I'm unlucky but this happens 4/5 times to me when taking the airport taxi back home...
It has been a while since the last news from Caravan but I'm happy to announce that a new extension has just been published.
Caravan-CZ, a dataset curated by CHMI itself in cooperation with Grey Nearing.
For details check: github.com/kratzert/Car...
All extensions:
github.com/kratzert/Car...
Caravan-CZ, a dataset curated by CHMI itself in cooperation with Grey Nearing.
For details check: github.com/kratzert/Car...
All extensions:
github.com/kratzert/Car...
[DATA CONTRIBUTION] CAMELS-CZ]: Catchment Attributes and Meteorology for Large-Sample Studies -- Czechia · Issue #49 · kratzert/Caravan
Basin prefix camelscz Zenodo DOI https://zenodo.org/records/17593968 Number of catchments 249 Location of catchments Czechia For which periods are streamflow records available in your dataset? 1950...
github.com
November 15, 2025 at 12:49 PM
It has been a while since the last news from Caravan but I'm happy to announce that a new extension has just been published.
Caravan-CZ, a dataset curated by CHMI itself in cooperation with Grey Nearing.
For details check: github.com/kratzert/Car...
All extensions:
github.com/kratzert/Car...
Caravan-CZ, a dataset curated by CHMI itself in cooperation with Grey Nearing.
For details check: github.com/kratzert/Car...
All extensions:
github.com/kratzert/Car...
The paper is finally published and we were able to keep the original title.
hess.copernicus.org/articles/29/...
hess.copernicus.org/articles/29/...
November 13, 2025 at 8:28 AM
The paper is finally published and we were able to keep the original title.
hess.copernicus.org/articles/29/...
hess.copernicus.org/articles/29/...
jax.config.update("jax_debug_nans", True) saved my day.
October 15, 2025 at 10:30 AM
jax.config.update("jax_debug_nans", True) saved my day.
Oh my god, I finally was able to fix it. After effectively not using my private laptop for the past 9 months (I have a corp laptop and a private desktop PC that runs Linux), I sat down and ask Gemini for help. I know, I know...
Thread for details.
Thread for details.
I made the mistake of updating my private laptop from ubuntu 22.04 to 24.04. Now everything is incredibly slow, no idea why. Reinstalled 22.04, same issue. Opening the terminal takes a couple of seconds, opening keepass takes 10s in the UI appears incrementally. #linux
September 27, 2025 at 8:56 PM
Oh my god, I finally was able to fix it. After effectively not using my private laptop for the past 9 months (I have a corp laptop and a private desktop PC that runs Linux), I sat down and ask Gemini for help. I know, I know...
Thread for details.
Thread for details.
This has easily been one of the most interesting external meetings in a while.
Looking forward to a full day of exciting talks at the GRIT workshop in Oxford.
🌐 Introducing GRIT: the First Global Bifurcating River Network 🏞
developed by Michel Wortmann as part of the NERC Large Grant EvoFLOOD, in the Hydro-Climate Extremes group @oxfordgeography.bsky.social
developed by Michel Wortmann as part of the NERC Large Grant EvoFLOOD, in the Hydro-Climate Extremes group @oxfordgeography.bsky.social
September 27, 2025 at 9:06 AM
This has easily been one of the most interesting external meetings in a while.