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#hydrology

0 posts0 participants0 posts today
Public
Doug Bostrom

"White House spokesperson Anna Kelly said federal workforce reductions will ensure disaster responses are not bogged down by bureaucracy and bloat."

And thanks to #APNews we get a complete explanation of how and why that is complete bullshit, sourced from experts and not an ignorant shill.

AP is a nonprofit and a thin line dividing us from becoming herded cattle. Read the story, then find the donate button and do so if at all possible.

#hydrology
#dams

apnews.com/article/dams-fired-

Public
Dr Micha Campbell

🚨 New preprint 🚨

Hydrology and cave (and cave hydrology!) enthusiasts may enjoy this preprint just posted today for community review in the #EGU journal #HESS. Led by former #UNSW student, Christina Song, with @Andbaker and myself, we looked at recharge thresholds (amount of precipitation needed for recharge to occur in a cave), and how they changed after a fire.

egusphere.copernicus.org/prepr

The preprint is open now for community discussion, and will be accepting comments until 23 April.

egusphere.copernicus.orgRainfall recharge thresholds decrease after an intense fire over a near-surface cave at Wombeyan, AustraliaAbstract. Quantifying the amount of rainfall needed to generate groundwater recharge is important for the sustainable management of groundwater resources. Here, we quantify rainfall recharge thresholds using drip loggers situated in a near-surface cave: Wildman’s cave at Wombeyan, southeast Australia. In just over two years of monitoring, 42 potential recharge events were identified in the cave, approximately 4 m below land surface which comprises a 30° slope with 37 % bare rock. Recharge events occurred within 48 hours of rainfall. Using daily precipitation data, the median 48 h rainfall needed to generate recharge was 19.8 mm, without clear seasonal variability. An intense experimental fire experiment was conducted 18 months into the monitoring period: the median 48 h rainfall needed to generate recharge was 22.1 mm before the fire (n=22) and 16.4 mm after the fire (n=20), with the decrease in rainfall recharge most noticeable starting three months after the fire.. Rainfall recharge thresholds and number of potential recharge events at Wildman’s Cave are consistent with those published from other caves in water-limited Australia. At Wildman’s Cave, we infer that soil water storage, combined with the generation of overland flow over bare limestone surfaces is the pathway for water movement to the subsurface via fractures and that these determine the rainfall recharge threshold. Immediately after the fire, surface ash deposits initially retard overland flow, and after ash removal from the land surface, soil loss and damage decrease the available soil water storage capacity, leading to more efficient infiltration and a decreased rainfall recharge threshold.
#Hydrology#groundwater#preprint
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💧🌏 Greg Cocks

Grfin Tools—User Guide And Methods For Modeling Landslide Runout And Debris-Flow Growth And Inundation
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pubs.usgs.gov/publication/tm14 <-- shared USGS publication
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code.usgs.gov/grfintools/grfin <-- shared USGS software release
--
H/T Jonathan Perkins USGS
[ another open source resource for everyone from the USGS ~smile~ ]
#GIS #spatial #mapping #opensource #openlibrary #Grfin #software #package #regional #debrisflow #engineeringgeology #geology #inundation #spatialanalysis #spatiotemporal #geophysics #geophysical #massmovement #landslide #lahar #volcano #rock #avalanche #model #modeling #statistical #geostatistics #water #hydrology #downstream #elevation #remotesensing #DEM #flow #runout #risk #hazard #tools #slope #erosion #drainage #network #channel #channelisation #userguide
@USGS

screen shot - grfintools software repository home page (https://code.usgs.gov/grfintools/grfintools)
report figure 2 - Schematic flowchart illustrating common pathways for using Grfin Tools with examples identified in orange boxes
report figure 1 - Perspective view of topography illustrating the potential locations for three types of mass movements that can be derived from a Grfin Tools analysis.
USGS report cover page - Grfin Tools—User Guide And Methods For Modeling Landslide Runout And Debris-Flow Growth And Inundation
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💧🌏 Greg Cocks

Restoring Predators, Restoring Ecosystems: Yellowstone Wolves And Other Carnivores Drive Strong Trophic Cascade
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phys.org/news/2025-02-predator <-- shared technical article
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doi.org/10.1016/j.gecco.2025.e <-- shared paper
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#GIS #spatial #mapping #YellowstoneNationalPark #Largecarnivores #Willows #Crownvolume #Chronosequencephotographs #Trophiccascade #strength #ecosystem #ecology #biology #biodiversity #vegetation #wolf #elk #willows #riparian #stream #water #hydrology #tree #health #foresthealth #herbivore #carnivore #reintroduction #plants #spatialanalysis #spatiotemporal #biomass #foodweb #predictivemodel #model #modeling #response #predators #yellowstone

photo - wolf crossing a road
schematic - trophic cascade with wolves in Yellowstone National Park
charts - The Yellowstone trophic cascade in context. Wolves were introduced into Yellowstone in 1995 and 1996. Between 2001 and 2020, estimated average willow crown volume in northern Yellowstone rose from approximately 0.30 m3 to 4.80 m3 (A; error bars indicate 95 % confidence intervals). This change corresponds to a log10 response ratio of 1.21 (B), which is substantially greater than the response ratios observed in many other studies (C). Willow crown volume was calculated using height data from Cooper and Hobbs (2023) and the crown volume model from Kauffman and Cummings (2024). Except for Yellowstone willows, average log10 ratios by system type were obtained from a trophic cascade meta-analysis of plant biomass studies (Borer et al., 2005); sample sizes are shown in parentheses; error bars represent one standard error of the mean (C).
photos - (A) Downstream view of the East Fork of Blacktail Deer Creek in August 2004 and September 2021, northern range of Yellowstone National Park, USA. Note the 2.4 m tall fenced ungulate exclosure near the bottom right of the 2004 photo with willows alongside sagebrush, which was part of a Cooper and Hobbs (2023) experimental site. In 2002, willow heights outside the newly constructed fence averaged 68 cm whereas willows inside the fence averaged 85 cm in height (25 % taller). In 2020, willow heights outside the fence averaged 165 cm while willows fully protected from ungulate herbivory inside the fence were 195 cm in height (18 % taller). The fence was constructed in 2001 and removed by the spring of 2021. The similarity, in this example, between inside and outside the exclosure in 2021 is consistent with the strong trophic cascade quantified in the full time-series dataset. (B) Upstream view of Blacktail Deer Creek in 2005 and 2021 and (C) an across channel view in 2005 and 2021 of another reach farther downstream. These chronosequence photographs should be considered examples only, but they do indicate that tall willows, with greatly increased crown volumes, had become relatively common along the valley bottom and floodplains of Blacktail Creek.
Public
Sunguramy :nb_lily:

#Karstmas day 16 :boost_requested:

Traditionally on this day in years past I enjoyed going to this cave, a lovely almost 300 foot rappel next to a waterfall. Easy rig. Fun cave. I hung over the edge with a tripod to take this photo from the top looking down, a lone figure on rope and a light shinning up from the depths below.

(PS - I hope you all have been enjoying Karstmas! However I am unlikely to be able to post for the next few days due to situation beyond my control. I hope you stay tuned! Follow me or the Karstmas hashtag to not miss anything when I'm able to be back!)

A photo of a pit in a cave looking down from the top edge. A line, which is a rope, runs from left bottom of the frame down to a human shaped shadow on rope. There are some bright lights below the mist. A huge waterfall crashes into the depths.
#caves#caving#geology
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Stingray's Badger Friend

LONG POST ON #ELNINO / #FLOODING
As we hear of the effects of the #ClimateEmergency round the world, and see #flooding in #Norway I am reminded of #StormDesmond that hit #Cumbria between 5th & 6th Dec 2015. In 48 hours #Thirlmere in #LakeDistrict recorded 405mm of rainfall in combination with severe gales up to 81mph. This was an El Nino year.

It was the 4th major storm of the autumn. The ground and the lakes were already saturated.

#ClimateCrisis
#ClimateAction
#FloodPrevention
#Hydrology

Road on a hillside washed almost completely away, man in waterproof gear stands at the edge of remaining road looking down at the river
Public
Bryan Lawrence

Belated #introduction. Expat #kiwi living in Europe, albeit a bit with an identity crisis. Will toot about the #uk, sorry!

Into #climate, #ClimateScience & #ClimateModelling (particularly #ESM and #hydrology) using #CloudComputing & #HPC.
Also #DataScience, #DigitalCuration #metadata & the philosophy & practice of #simulation in all sci.

History: I brought the internet to the south island of NZ & invented and ran #jasmin for 10y (jasmin.ac.uk) Helped procure #Archer & #Archer2.

jasmin.ac.ukJASMIN Site
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