John Hammond
@hydrohammond.bsky.social
Research hydrologist and river photographer. www.riversfromabove.com
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John Hammond
@hydrohammond.bsky.social
· Mar 20
Hydrological Whiplash: Highlighting the Need for Better Understanding and Quantification of Sub‐Seasonal Hydrological Extreme Transitions
Hydrological whiplash, or the sub-seasonal transition between hydrological extremes, has broad implications for water resource management, ecosystems, infrastructure, and human society. As this pheno...
doi.org
Science! Super proud of this commentary that results from conversations started at @agu.org in December. We propose the term hydrological whiplash, sub-seasonal transitions between hydrological extremes, and outline why we think this topic needs greater attention.
doi.org/10.1002/hyp....
doi.org/10.1002/hyp....
Time to get your public comments in on the proposed Waters of the U.S. rule that would strip protections for countless wetlands and streams.
Trout unlimited has a tool on their page that will automatically send your message to the EPA as well as your representatives:
www.tu.org/conservation...
Trout unlimited has a tool on their page that will automatically send your message to the EPA as well as your representatives:
www.tu.org/conservation...
November 23, 2025 at 11:03 PM
Time to get your public comments in on the proposed Waters of the U.S. rule that would strip protections for countless wetlands and streams.
Trout unlimited has a tool on their page that will automatically send your message to the EPA as well as your representatives:
www.tu.org/conservation...
Trout unlimited has a tool on their page that will automatically send your message to the EPA as well as your representatives:
www.tu.org/conservation...
These lagged ecosystem feedbacks (e.g., reduced LAI after droughts, vegetation water-saving, enhanced recharge) may act as resilience mechanisms — but may become insufficient if extremes intensify under climate change.
November 19, 2025 at 7:55 PM
These lagged ecosystem feedbacks (e.g., reduced LAI after droughts, vegetation water-saving, enhanced recharge) may act as resilience mechanisms — but may become insufficient if extremes intensify under climate change.
Topographic position matters: upslope areas show stronger sensitivity to early‐season hydroclimate anomalies than riparian zones, where lateral subsurface flow buffers vegetation response.
November 19, 2025 at 7:55 PM
Topographic position matters: upslope areas show stronger sensitivity to early‐season hydroclimate anomalies than riparian zones, where lateral subsurface flow buffers vegetation response.
- They find a non-linear relationship: both very low and very high early-season precipitation lead to reduced late-season leaf area index (LAI), with “normal” precipitation maximising LAI and productivity.
November 19, 2025 at 7:55 PM
- They find a non-linear relationship: both very low and very high early-season precipitation lead to reduced late-season leaf area index (LAI), with “normal” precipitation maximising LAI and productivity.
The study uses the eco-hydrological model RHESSys to simulate the forested Beetree Creek watershed (North Carolina, USA) and explores how early-growing-season rainfall anomalies affect late-season vegetation (LAI) and water use.
November 19, 2025 at 7:55 PM
The study uses the eco-hydrological model RHESSys to simulate the forested Beetree Creek watershed (North Carolina, USA) and explores how early-growing-season rainfall anomalies affect late-season vegetation (LAI) and water use.
New preprint: “Do lagged ecosystem feedbacks to hydroclimate extremes promote resilience of forest watersheds?” doi.org/10.22541/ess...
#Ecohydrology #ForestWatersheds #HydroclimateExtremes #LaggedFeedbacks #WaterResourcesResearch
#Ecohydrology #ForestWatersheds #HydroclimateExtremes #LaggedFeedbacks #WaterResourcesResearch
November 19, 2025 at 7:55 PM
New preprint: “Do lagged ecosystem feedbacks to hydroclimate extremes promote resilience of forest watersheds?” doi.org/10.22541/ess...
#Ecohydrology #ForestWatersheds #HydroclimateExtremes #LaggedFeedbacks #WaterResourcesResearch
#Ecohydrology #ForestWatersheds #HydroclimateExtremes #LaggedFeedbacks #WaterResourcesResearch
Such beautiful forests and streams!
November 19, 2025 at 1:14 AM
Such beautiful forests and streams!
Implication: Hydrological models and land‑management plans need to incorporate local context (watershed structure, pre‑fire conditions) rather than assuming a standard post‑fire hydrologic shift.
November 18, 2025 at 7:00 PM
Implication: Hydrological models and land‑management plans need to incorporate local context (watershed structure, pre‑fire conditions) rather than assuming a standard post‑fire hydrologic shift.
The study analyses data from 898 burned catchments and over 8,000 unburned control catchments to assess post‑wildfire hydrological trends.
November 18, 2025 at 7:00 PM
The study analyses data from 898 burned catchments and over 8,000 unburned control catchments to assess post‑wildfire hydrological trends.
“Universal hydrological trends post‑wildfire are obscured by local watershed variability”
iopscience.iop.org/article/10.1...
#Hydrology #Wildfire #WatershedProcesses #Streamflow #WaterResources
iopscience.iop.org/article/10.1...
#Hydrology #Wildfire #WatershedProcesses #Streamflow #WaterResources
November 18, 2025 at 7:00 PM
“Universal hydrological trends post‑wildfire are obscured by local watershed variability”
iopscience.iop.org/article/10.1...
#Hydrology #Wildfire #WatershedProcesses #Streamflow #WaterResources
iopscience.iop.org/article/10.1...
#Hydrology #Wildfire #WatershedProcesses #Streamflow #WaterResources
Reposted by John Hammond
We're seeking a Program Specialist to lead communications, coordinate federal reporting, and support program initiatives for Lake Champlain Sea Grant and two allied programs. Learn more and apply online at www.uvmjobs.com/postings/84002.
![We're hiring! LCSG seeks a program specialist to join our team [text superimposed on a picture of the Lake Champlain shoreline]](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:th5gekjxzu3z3uwm52pmwx7v/bafkreifjmvpjdmyuxg35a334lvrx7bwymdpucvpjb2minznmaf5d6de4qi@jpeg)
November 17, 2025 at 6:52 PM
We're seeking a Program Specialist to lead communications, coordinate federal reporting, and support program initiatives for Lake Champlain Sea Grant and two allied programs. Learn more and apply online at www.uvmjobs.com/postings/84002.
Reposted by John Hammond
Hydrology Paper of the Day @felipesaa.bsky.social @lytarasova.bsky.social on accurate modelling of nitrate concentration: capturing soil moisture patterns and hydrological connectivity during wet and dry conditions; pattern identification with explainable AI; and catchments in the Midwestern US.
November 17, 2025 at 3:53 AM
Hydrology Paper of the Day @felipesaa.bsky.social @lytarasova.bsky.social on accurate modelling of nitrate concentration: capturing soil moisture patterns and hydrological connectivity during wet and dry conditions; pattern identification with explainable AI; and catchments in the Midwestern US.
Stream Name Counts | #
1) Mill Creek 6213
2) Spring Creek 5862
3) Dry Creek 5750
4) Bear Creek 4945
5) Beaver Creek 4740
6) Rock Creek 4514
7) Indian Creek 4231
8) Cedar Creek 3849
9) Willow Creek 3777
10) Cottonwood Creek 3694
11) Big Creek 3424
12) Clear Creek 3223
1) Mill Creek 6213
2) Spring Creek 5862
3) Dry Creek 5750
4) Bear Creek 4945
5) Beaver Creek 4740
6) Rock Creek 4514
7) Indian Creek 4231
8) Cedar Creek 3849
9) Willow Creek 3777
10) Cottonwood Creek 3694
11) Big Creek 3424
12) Clear Creek 3223
November 16, 2025 at 9:41 PM
Stream Name Counts | #
1) Mill Creek 6213
2) Spring Creek 5862
3) Dry Creek 5750
4) Bear Creek 4945
5) Beaver Creek 4740
6) Rock Creek 4514
7) Indian Creek 4231
8) Cedar Creek 3849
9) Willow Creek 3777
10) Cottonwood Creek 3694
11) Big Creek 3424
12) Clear Creek 3223
1) Mill Creek 6213
2) Spring Creek 5862
3) Dry Creek 5750
4) Bear Creek 4945
5) Beaver Creek 4740
6) Rock Creek 4514
7) Indian Creek 4231
8) Cedar Creek 3849
9) Willow Creek 3777
10) Cottonwood Creek 3694
11) Big Creek 3424
12) Clear Creek 3223
In many cases, the most common headwater stream name in region, but in some regions longer rivers like the Rio Grande have more named segments than headwater creeks of one name. Derived from NHDplusV2 flowlines. Table below is for the whole U.S. together, without separating by region.
November 16, 2025 at 9:41 PM
In many cases, the most common headwater stream name in region, but in some regions longer rivers like the Rio Grande have more named segments than headwater creeks of one name. Derived from NHDplusV2 flowlines. Table below is for the whole U.S. together, without separating by region.
Ever wonder how streams and rivers differ in naming across the country and what the most common names are? Here are the most common names of stream/river segments by HUC2 region across the U.S.
November 16, 2025 at 9:41 PM
Ever wonder how streams and rivers differ in naming across the country and what the most common names are? Here are the most common names of stream/river segments by HUC2 region across the U.S.
Thank you @kinarnicholas.bsky.social !
November 16, 2025 at 8:51 AM
Thank you @kinarnicholas.bsky.social !
Hydrological extreme impact on aquatic species in the news: phys.org/news/2025-10...
Almost 75,000 farmed salmon in Scotland escaped into the wild after Storm Amy. Why this may cause lasting damage
When Storm Amy battered the Scottish Highlands in early October, it tore through a salmon farm's sea pens, releasing around 75,000 fish into open water in Loch Linnhe. The scale of the escape is alarm...
phys.org
November 15, 2025 at 12:33 AM
Hydrological extreme impact on aquatic species in the news: phys.org/news/2025-10...
Reposted by John Hammond
Expected impacts from this weekend's major SoCal storm--which now appears likely to feature widespread flood risk and also a few severe thunderstorms--continue to increase. I will have a blog post and YouTube livestream at a TBD time later today to discuss. #CAwx
November 14, 2025 at 5:39 PM
Expected impacts from this weekend's major SoCal storm--which now appears likely to feature widespread flood risk and also a few severe thunderstorms--continue to increase. I will have a blog post and YouTube livestream at a TBD time later today to discuss. #CAwx
Highlights why forecasts need to capture these cross-timescale links, especially under changing climate and land use.
lnkd.in/epz5_ZBZ
#Hydrology #Streamflow #Timescales #WaterResources
lnkd.in/epz5_ZBZ
#Hydrology #Streamflow #Timescales #WaterResources
LinkedIn
This link will take you to a page that’s not on LinkedIn
lnkd.in
November 14, 2025 at 6:49 PM
Highlights why forecasts need to capture these cross-timescale links, especially under changing climate and land use.
lnkd.in/epz5_ZBZ
#Hydrology #Streamflow #Timescales #WaterResources
lnkd.in/epz5_ZBZ
#Hydrology #Streamflow #Timescales #WaterResources
“On the Structure of Temporal Variability of Streamflow Responses and the Role of Timescale Interactions — A Synthesis”
A nice synthesis showing how streamflow variability emerges from interacting timescales — fast events like storms intertwined with slower processes like soil moisture and memory.
A nice synthesis showing how streamflow variability emerges from interacting timescales — fast events like storms intertwined with slower processes like soil moisture and memory.
November 14, 2025 at 6:49 PM
“On the Structure of Temporal Variability of Streamflow Responses and the Role of Timescale Interactions — A Synthesis”
A nice synthesis showing how streamflow variability emerges from interacting timescales — fast events like storms intertwined with slower processes like soil moisture and memory.
A nice synthesis showing how streamflow variability emerges from interacting timescales — fast events like storms intertwined with slower processes like soil moisture and memory.
Reposted by John Hammond
Still some time to apply for a PhD position in my group @ufz.de in my group with the focus on streams, hydrometric and isotopic signatures and ML: recruitingapp-5128.de.umantis.com/Vacancies/32... Looking forward for your applications 🤩
November 14, 2025 at 3:39 PM
Still some time to apply for a PhD position in my group @ufz.de in my group with the focus on streams, hydrometric and isotopic signatures and ML: recruitingapp-5128.de.umantis.com/Vacancies/32... Looking forward for your applications 🤩
Thank you Niklas!
November 14, 2025 at 11:13 AM
Thank you Niklas!
Reposted by John Hammond
The National Water Availability Assessment cyberseminar series is back on schedule for next week! USGS's Althea Archer and Anthony Martinez for, Communicating the Science with Data Science and Visualizations.
November 19, 12pm-1pm ET
More information available on our website - lnkd.in/e_a8u-Tp
November 19, 12pm-1pm ET
More information available on our website - lnkd.in/e_a8u-Tp
November 13, 2025 at 6:56 PM
The National Water Availability Assessment cyberseminar series is back on schedule for next week! USGS's Althea Archer and Anthony Martinez for, Communicating the Science with Data Science and Visualizations.
November 19, 12pm-1pm ET
More information available on our website - lnkd.in/e_a8u-Tp
November 19, 12pm-1pm ET
More information available on our website - lnkd.in/e_a8u-Tp