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#hydrology

5 innlegg5 deltakere0 innlegg i dag
Offentlig
Dr Micha Campbell

One month left to provide feedback on our preprint "Rainfall recharge thresholds decrease after an intense fire over a near-surface cave at Wombeyan, Australia."

We are keen for some constructive feedback to improve the paper :)

egusphere.copernicus.org/prepr

#hydrology #KarstHydrology #Groundwater #preprint

@Andbaker

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.
Offentlig
Dr Micha Campbell

There's only one month left for open comments on our current preprint, which looks at rainfall recharge thresholds before and after a fire.

We are very interested to get some community input! If you are interested in #groundwater #waterResources #karstHydrology #hydrology, please check it out.

egusphere.copernicus.org/prepr

@Andbaker

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.
Offentlig
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-

Offentlig
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
Offentlig *
GIS OpenCourseWare

Day 3 of #OpenEducationWeek 2025! Highlighting #QGIS courses for #hydrology: courses.gisopencourseware.org/

💧Hydrological Analysis with PCRaster Tools plugin

🔧Programming for Geospatial Hydrological Applications

🏞️Workshop QGIS for Hydrological Applications

📖QGIS Advanced Tutorials

🌏GIS Training for Hydrogeological Applications

:qgis: QGIS for Hydrological Applications

Thank you to our volunteer translators! Interested in translating or hosting a course? Contact me!

#OEWeek#OEWeek2025
Offentlig *
💧🌏 Greg Cocks

Grfin Tools—User Guide And Methods For Modeling Landslide Runout And Debris-Flow Growth And Inundation
--
pubs.usgs.gov/publication/tm14 <-- shared USGS publication
--
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
Offentlig *
💧🌏 Greg Cocks

Restoring Predators, Restoring Ecosystems: Yellowstone Wolves And Other Carnivores Drive Strong Trophic Cascade
--
phys.org/news/2025-02-predator <-- shared technical article
--
doi.org/10.1016/j.gecco.2025.e <-- shared paper
--
#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.
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