Geobulletin alpha

News from the Geoblogosphere feed

by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

Posts treating: "Glen Canyon Dam"

Tuesday, 06 October 2015

sort by: date | clicks

Rock slab stabilized at Glen Canyon Dam 

Arizona Geology [2015-10-06 17:05:00]  recommend  recommend this post  (161 visits) info

 Jurassic; US
img
The 250-ton slab of Navajo Sandstone peeling off the south wall of the canyon at Glen Canyon dam has been bolted into place to prevent it from falling on to power plant facilities immediately below (bottom photo).   The photo below shows the slab in the lower left area of the circle below with dozens of dark circles marking the rock bolts.  [my photo, 10-5-15] An official at the dam said

Glen Canyon Dam in Arizona – an interesting rockfall problem 

The Landslide Blog [2015-09-07 11:19:53]  recommend  recommend this post  (178 visits) info

 US
A joint rock block is forming close to the Glen Canyon Dam in Arizona, threatening infrastructure at the foot of the slope. The US Bureau of Reclamation are involved in an extraordinary project to try to stabilise

Slab of Navajo Sandstone threatens to fall on Glen Canyon dam facilities 

Arizona Geology [2015-09-05 16:27:00]  recommend  recommend this post  (213 visits) info

 Jurassic; US
img
A 250-ton slab of Navajo Sandstone is threatening to peel off the rock wall above Lake Powell overlooking power plant facilities below Glen Canyon Dam.   Photos from local professional  photographer Frank Talbott (http://www.franktalbott.net/) show work by Bureau of Reclamation crews rappelling off the cliff face in an attempt to install rock bolts and prevent the slab from falling.  

Rebuilding Sandbars in the Grand Canyon 

Geospace [2015-06-03 19:42:29]  recommend  recommend this post  (155 visits) info

 US
The Grand Canyon is a bit closer to how it was before one of the country’s largest dams was installed upstream. Three years of releasing water from Glen Canyon Dam to generate controlled floods has resulted in rebuilding sandbars in the Grand Canyon, according to a new USGS article published in Eos, the daily Earth and space science website published by the American Geophysical Union. These simulated floods redistribute sand and mud, which helps develop this critical

Texas/Oklahoma flooding, record rains, Louis Creek Dam evacuation 

Geology in Motion [2015-05-25 02:36:48]  recommend  recommend this post  (196 visits) info

 CA,US,
img
The jet stream patterns that have set up the currentwet situation in Texas. From Weather.com hereon May 24.Over 350 homes in Hays County, Texas, are gone, and more than 1000 are damaged according to reports coming out this Memorial Day weekend. At least one person in Texas and two in Oklahoma have died as a result of the storms. The Blanco River surged up 28' in 2 hours as the flood surged to 40', three times the flood level.  And as of this (Sunday) evening, more rains are expected, [...]

Tse' bighanilini and Hasdestwazi, "the place where water runs through rocks", and "spiral rock arches." 

Geotripper [2014-06-22 00:42:00]  recommend  recommend this post  (707 visits) info

 FR,US
img
Glen Canyon was a beautiful, magical place that was unceremoniously flooded under the waters of Lake Powell (and I'm pretty sure John Wesley Powell would have been appalled that his name was given to the lake). Despite the gigantic eyesore of Glen Canyon Dam, there are some incredible places to explore in the immediate vicinity. One of them is Antelope Canyon, one of the Tribal Parks managed

A Rock Outcrop, a River, and Sand flow into a Point Bar... 

Geotripper [2014-06-21 04:34:00]  recommend  recommend this post  (115 visits) info

 US
img
And the bartender said "is this some kind of joke?" But it's not a joke of course, it's a simply stunning example of what happens when water flows over stone for a long time. What you are seeing here Horseshoe Bend on the Colorado River a few miles downstream of Glen Canyon Dam and Lake Powell outside of Page, Arizona. A point bar is a real thing with rivers. When a river loops back and

Glen Canyon Dam High Flow Next Week 

Geology.com News [2013-11-06 12:41:58]  recommend  recommend this post  (57 visits) info
On Monday, the Glen Canyon Dam is scheduled to start releasing up to 37,200 cubic feet of water per second – that is an Olympic-sized swimming pool worth of water into the Colorado River every two minutes. The goal is to imitate a natural flood that will deliver sand to beaches and refresh river

New geologic map of Glen Canyon Dam area, Utah and Arizona 

Arizona Geology [2013-05-16 13:33:00]  recommend  recommend this post  (103 visits) info
img
 The Utah Geological Survey has released a geologic map of the Glen Canyon Dam area of southern Utah and northern Arizona (provided as two plates-east and west parts), which is one of several maps recently completed by the Utah Geological Survey that provide complete geologic map coverage of Lake Powell and Glen Canyon National Recreation Area. The announcement says "Glen Canyon

PRELIMINARY GEOLOGIC MAP OF THE GLEN CANYON DAM AREA, GLEN CANYON NATIONAL RECREATION AREA, COCONINO COUNTY, ARIZONA, AND KANE AND SAN JUAN COUNTIES, UTAH 

Utah Geological Survey - blog [2013-05-13 18:11:59]  recommend  recommend this post  (82 visits) info
                      by Grant C. Willis This CD contains plot files of a geologic map of the Glen Canyon Dam area of southern Utah and northern Arizona (provided as two plates-east and west parts), and is one of several maps recently completed by the Utah Geological

The Physics of Making "Smoothies" 

Geology in Motion [2013-03-25 01:51:13]  recommend  recommend this post  (71 visits) info
img
Frame from a video on the referenced article. Note thecloudy region in the bottom of the liquid near the blades.This is caused by minute bubbles created by cavitation atthe tips of the blades. The brown layer on top of the wateris oil.Thanks to a colleague for pointing out an interesting article on shock waves in food blenders! Mathematician-turned-chef Chris Young and colleagues have collaborated in a series of articles to explain the science behind various cooking techniques. In this article, [...]

Colorado River flooding controversy 

Arizona Geology [2013-03-14 01:22:00]  recommend  recommend this post  (113 visits) info
img
The current issue of EARTH magazine has a cover story by former Prescott College geology instructor Terri Cook title "Releasing a flood of controversy on the Colorado River."   She notes that the controlled release of Lake Powell waters from behind Glen Canyon Dam to rebuild sand bars along the Colorado River, also brought unexpected results, including dramatically increasing rainbow

USGS geologic map of US 89 Bitter Springs landslide area 

Arizona Geology [2013-02-27 22:07:00]  recommend  recommend this post  (87 visits) info
img
<!--[if gte mso 9]> <![endif]-->Ancient landslides are extensive in the Echo Cliffs where last weeks landslide destroyed a section of US 89. The February 20 Bitter Springs landslide occurred within the boundaries of the Glen Canyon Dam 1:100k sheet. This was mapped by George Billingsley of the US Geological Survey in Flagstaff and has been peer reviewed, but is still pending

Glen Canyon Dam High Flow Experiment 

Geology.com News [2012-11-19 01:50:28]  recommend  recommend this post  (96 visits) info
On November 19th the U.S. Department of the Interior releases Colorado River water from Lake Powell reservoir under its new science-based protocol for adaptive management of Glen Canyon Dam. Since the dam was constructed in 1963 the river has not experienced its natural high flows. These controlled high flow experiments give the river an opportunity

The Abandoned Lands...A Journey Through the Colorado Plateau: The River Red, a little red goes a long way 

Geotripper [2012-07-18 20:45:00]  recommend  recommend this post  (100 visits) info
img
 Today's subject is a short distance from our last post at Wupatki, but we are separated in time...I'm back on the plateau for various reasons today, and yesterday we crossed the Colorado River ("the Red River") at Navajo Bridge. The last few times I was here the river was green and clear, having just been released from Glen Canyon Dam a few miles upstream. I was shocked yesterday to see

Controlled floods, Colorado River beaches, and power generation, 

Arizona Geology [2012-07-14 05:56:00]  recommend  recommend this post  (108 visits) info
img
There's an interesting twist to the fight between power generators and environmentalists over the Interior Dept. plans to release water from Glen Canyon dam for controlled floods to replenish sand beaches along the Colorado River.   [Right, USGS model of sand replenishment process from "controlled floods"] NPR's All Things Considered's story about the possible loss of $4 million of

Sediment floods approved from Glen Canyon dam 

Arizona Geology [2012-05-29 05:23:00]  recommend  recommend this post  (94 visits) info
img
The US Dept. of Interior plans to release controlled floods from Glen Canyon dam on a more regular basis, to try to rebuild beaches and sandbars, and return the Colorado River to a more natural state.  The releases are supposed to occur when conditions are right on the Paria River coming from Utah, and on the Little Colorado on the Arizona side to maximize sediment transport.     Without

The Beginning of the End 

Earthly Musings [2011-11-08 03:33:00]  recommend  recommend this post  (75 visits) info

 Quaternary
Here in the American Southwest, water is king and the scarcity of this commodity is written into the DNA of every living creature. Pack rats process so much water out of their urine that their pee comes out as thick as molasses. This enables them to get by on next to no water at all and they obtain most of what they need from what they eat. They are the ultimate southwestern creatures who laugh at the monthly periods of no rain that we oftentimes experience here.The pack rats' viscous pee has [...]

My 2011 Grand Canyon 7-Day Rafting Trip 

Earthly Musings [2011-08-18 00:15:00]  recommend  recommend this post  (93 visits) info

 Cambrian,Carboniferous,Triassic
img
My rafting trips in the Grand Canyon have become quite popular and this year I added an additional 7-day trip to my regularly scheduled 10-day trip. A shorter trip is preferred by some people and  allows those with work responsibilities to see the entire canyon in one week. We travel 280 miles - the whole length of the canyon. Every trip is different, with different boatmen, hikes, stops and camps. My recent trip was one of the best ever! Have a look.This blog is widely read as a geology [...]

Sandbar experiment downstream of Glen Canyon Dam 

Arizona Geology [2011-07-27 22:01:00]  recommend  recommend this post  (35 visits) info
img
http://pubs.er.usgs.gov/publication/70003971The USGS has published results of the most recent high flow experiments on the Colorado River to rebuild sand bars below Glen Canyon Dam. They found that "Each of the controlled floods resulted in sandbar deposition that was followed by erosion in the 6-month post-flood period. Erosion rates are positively correlated with post-flood dam release
Stratigraphy.net | Impressum
Ads: