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#debrisflow

1 post1 participant1 post today
Public
Hippy Steve

LAFD has info and maps for the various #Evacuation warnings they've issued for the coming rains and #DebrisFlow risks.

They've sent deputies into the field because while there are warnings for general areas, specific addresses will have mandatory evacuation orders. This is pretty smart really, and deputies can inform non-ordered addresses of risks, so educational.

lafd.org/news/evacuation-warni

Due to the forecasted high rains which have the potential to trigger mudslides and debris flows on March 12-13, the City of Los Angeles is issuing EVACUATION WARNINGS for several areas and limited, address specific Evacuation Orders which will go into effect from 7AM Wednesday (3/12/2025) to 6pm Thursday (3/13/2025)

lafd.orgEvacuation Warnings for March 12-13 Due to High Mudslide/Debris Flow Risk | Los Angeles Fire DepartmentDue to the forecasted high rains which have the potential to trigger mudslides and debris flows on March 12-13, the City of Los Angeles is issuing EVACUATION WARNINGS for several areas and limited, address specific Evacuation Orders which will go into effect from 7AM Wednesday (3/12/2025) to 6pm Thursday (3/13/2025)The warnings and orders are in recent burn areas which are especially susceptible to heavy rain.The map link above visually depicts the affected areas which are described as:
Public
💧🌏 Greg Cocks

Seismometers Reveal Earth's Longest-Runout Undersea Sediment Flows In Unprecedented Detail
--
phys.org/news/2025-02-seismome <-- shared technical article
--
doi.org/10.1038/s43247-025-021 <-- shared paper
--
doi.org/10.1016/j.geomorph.202 <-- shared paper
--
doi.org/10.1038/s41561-022-010 <-- shared paper
--

cross section / schematic - Surge dynamics of canyon-flushing turbidity currents
Difference maps showing seabed changes (in metres) in the upper Congo Canyon between 2019 and 2020... The grey shaded base map shows seabed gradients in 2020. Shades of red correspond to areas of erosion, and blue to areas of deposition.
Bathymetric map of the Congo Canyon-Channel system and instrument placement
schematics - Schematic summary of the categories for types of seabed erosion observed in the Congo Canyon-channel between 2019 and 2020, and their relative volumetric importance
Public *
💧🌏 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~ ]

@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
Public
AI6YR Ben

Flash Flood Warning issued February 13 at 5:30PM PST until February 13 at 8:00PM PST by NWS Los Angeles/Oxnard CA


At 530 PM PST, local law enforcement reported dangerous debris flows in Altadena as a result of extremely heavy rainfall that is moving over the area. THIS IS A VERY DANGEROUS SITUATION!

HAZARD...Life threatening debris flows in and around the Eaton
Burn Scar.

SOURCE...Law enforcement reported.

IMPACT...Mud, rock, and debris flows are impacting drainages,
roads, and residences in and directly below the burn
area.

#EatonFire#DebrisFlow#CAwx
Public
Joseph Elfelt

Info on #DebrisFlow cameras. Snipped from FB. #AtmosphericRiver #CAwx

"Update: all seven new cameras are now online
With a major atmospheric river projected to hit Southern California this week, ALERTCalifornia's field team has been working hard to install seven new cameras around Los Angeles to help emergency managers monitor potential debris flows from the Eaton and Palisades burn scars. The Bailey Canyon 1 & 2, Sierra Madre Canyon 1 & 2, and Sierra Madre Bridge cameras are already online for the the Eaton Fire scar. Cloudcroft 1 & 2 cameras will be online soon for the Palisades Fire scar. Search camera names at cameras.alertcalifornia.org to see their locations."

Public *
Joseph Elfelt

When this map opens it is centered on the #EatonFire area and shows the drainage ways with a black dot at the low end of each one. The map also shows the weather radar with yellow areas indicating heavier rain than green areas.

There is concern that heavy rains may cause #DebrisFlow

You can drag the map over to the area of the #PalisadesFire and see the same thing.
#AtmosphericRiver #CAwx

Open GISsurfer map:
mappingsupport.com/p2/gissurfe

Public
Joseph Elfelt

The colors on this map always show an estimate from NOAA of the rainfall expected over the next 5 days. As is typical, south facing slopes are expected to receive increased rain.

The map also shows pink shading for recent fire perimeters including for the #EatonFire and #PalisadesFire where there is at least some #DebrisFlow risk.
#AtmosphericRiver #CAwx

Open GISsurfer map:
mappingsupport.com/p2/gissurfe

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