Links: Headwaters of the Susan River and Lassen Volcanic National Park

Geologic Map of Lassen Volcanic National Park and Vicinity, California:
main page at USGS

Geologic Map of Lassen Volcanic National Park and Vicinity, California:
Sheet 1, geologic map

Geologic Map of Lassen Volcanic National Park and Vicinity, California:
Sheet 2, correlation chart

Geologic Map of Lassen Volcanic National Park and Vicinity, California:
Sheet 3, figures

Geologic Map of Lassen Volcanic National Park and Vicinity, California:
pamphlet (write up of the geology)

Susan River (Wikipedia)

Susan River Area Rapid Watershed Assessment (USDA NRCS)

Bizz Johnson Trail and Susan River (BLM)

Bizz Johnson Trail and Susan River (Friends of the River)

Great Basin (NPS)

Great Basin (Wikipedia)

Ishi, Thousand Lakes & Caribou Wilderness (order the wilderness map)

Hydraulic Jump Links

Hydraulic jump on Naramatagawa River (Gunnma) by aokomoriuta（青子守歌）

Last year I posted about Hat Creek in northern California, and in the process of creating the post, I came up with a number of links about hydraulic jumps. I was trying to teach myself a little about hydrology, which was not something taught in any class offered while I was in school many years ago (except for Ground Water Hydrology, which didn't get into the surface water or surface flow aspects of ground water very much). I became confused reading about hydraulic jumps online, about how the water level increases where the flow changes from supercritical to subcritical (in a downstream direction), with whitewater or rapids being examples of hydraulic jumps. My confusion came because in my pictures of Hat Creek, the water level starts off higher, then drops into the rapids after flowing over some logs. What I failed to realize until things were clarified for me by Anne Jefferson at Highly Allochthonous, was that my Hat Creek photos show a *small* hydraulic jump, and that the water level rises in the whitewater itself, nevermind the drop it makes over the log jam.

Rather than trying to explain hydraulic jumps further myself, I'm simply going to provide some links for those of you that want to learn more.

Critical flow constrains flow hydraulics in mobile-bed streams:
A new hypothesis (1997) Gordon E. Grant: Water Resources Research - A 1.2 MB pdf, possibly not that new anymore?

Hydraulic model study of a canoe chute for low-head dams in Illinois (1999) Marjorie E. Caisley, Fabian A. Bombardelli, and Marcelo H. Garcia: Illinois Department of Natural Resources - A 6.0 MB pdf, long and somewhat technical.

Hydraulic Jumps: Bubbles and Bores (2007) H. Chanson: 16th Australasian Fluid Mechanics Conference, Crown Plaza, Gold Coast, Australia - Technical, with good examples of tidal bores.

"The hydraulic jump is the sudden transition from a high-velocity open channel flow regime to a subcritical flow motion."

Open Channel Flow Basics - Hydraulic Jump Calculations (2010) Harlan Bengtson: Bright Hub - Some basics with calculations.

"A hydraulic jump occurs wherever a supercritical flow is taking place in a channel that doesn't have a slope steep enough to maintain the supercritical flow."

Hydraulic Jump (2003) Cathy Hartner, Shelly Davis, and Michon Hale - basics and some calculations (possibly a student paper?).

"A hydraulic jump is a sudden rise in water level due to decreasing velocity."

Hydraulic Jumps I: 1-Layer Flow by Bruce R. Sutherland: University of Alberta - pictures of hydraulic jumps.

Surface Tension and the Hydraulic Jump by John W. M. Bush: MIT - More pictures!

Hydraulics over a weir by Little River Research and Design - A great video showing a hydraulic jump.

Underwater view of turbulence and fish by Little River Research and Design - An underwater video, I didn't see the fish, just the rocks. UPDATE: See first comment and additional video below.

Smallmouth bass and dusky shiners in high velocity closeup - Also by Little River Research and Design - this is the one with the fish in it!

(This post is part of my ongoing project to clean out my drafts folder, which I usually revive at the beginning of each year.)

Another Stolen Blog: WaterWired

WaterWired, a blog written by Michael E. 'Aquadoc' Campana, is being scraped by a the Atmospheric Water Generation website/psuedoblog, an outfit selling water products. They have scraped his entire blog content word for word, including his most recent post protesting their action.

You can email them in protest by writing to "Gary" at gary@tivolinaturals.com, presuming, that is, that the email address is legitimate. Commenting on the "blog" is not possible.

UPDATE 20Nov2010 1:26 pm: Gary has written back saying that "the webmaster did this without authorization." He has removed all the WaterWired content! No need to write more emails. :)

What Dust Hazard?

There's more of a mud and snow hazard this time of year! This sign was seen on a recent roadtrip across central Nevada. Everything brown is yucky, stick-to-boot-type mud.


View Highway 50 in Nevada in a larger map
Zoom in and check out the meanders and cut-off meanders on Slough Creek!

Hydrology Positions

I recently got an email stating the Tetra Tech has several job openings:

...we have a lot of job openings throughout the world and we are currently looking to hire 20 people for our region which include[s] Florida, Texas, New Mexico, Pennsylvania, Maryland, South Carolina, and few more [other offices]. We are looking for people with a minimum of a BS in Geol, Hydro, Geophys or other related fields. For more info on Tetra Tech view the website: http://www.ttnus.com/.

Contact is the following:
Brian G. Reed, Staff Hydrogeologist
Direct: 832.251.6057 Main: 832.251.5160 Fax: 832.251.5190 brian.reed@tetratech.com
Tetra Tech Complex World, Clear Solutions 2901 Wilcrest, Suite 405 Houston, TX 77042-6012
www.tetratech.com http://www.ttnus.com/

This information was sent to me via the Geological Society of Nevada.

NOTICE: Announcements or listings of any jobs on this website does not constitute approval by the website owner of any companies, corporations, or individuals mentioned in these listings. If you are looking for a job, you need to do any research required to learn about the job and company you are applying for on your own and prior to job application or job acceptance. It is not my responsibility to do any of this research for any reader of this blog, nor is it my responsibility to pre-screeen any type of job information for any reader of this blog. Comments regarding companies, corporations, or individuals in these listings will generally not be accepted unless pre-approved through email-contact channels.