Manmade Flood to Nourish Grand Canyon Ecosystem 56
Dr. Eggman writes "The Associated Press brings us news of a flood in the Grand Canyon. This flood is no ordinary flood, however. This is a man-made flood released from the Glen Canyon Dam. The Dam is releasing four to five times its normal amount of water over the course of a three day artificial flood. Scientists are conducting this massive experiment in order to document and better understand the complex relation of the aquatic habitats, natural floods, and the sediment they bring. Floods no longer bring sediment to these parts of the canyon as the Dam keeps it locked up and released in small, drawn out intervals. The Dam prevents the floods from bringing the sediments in to replenish the sandbars and allow the river to maintain its warm, murky habitat rather than a cool, clear one. It is thought that this cool clear environment brought on by the dam is responsible for helping to extinguish 4 species of fish and push 2 more towards the brink. It is hoped that this terra-reformation experiment will positively impact the habitat and fish populations, warranting further artificial floods at an increased rate of every one to two years rather than the time span between the two previous floods and this one of 8 and 4 years."
Comment removed (Score:5, Informative)
And also see the other side.. (Score:2, Informative)
" Far from restoring crucial sand banks and other areas, the flows could destroy habitat, [Grand Canyon National Park Supt. Steve Martin] said. One flood was not enough, Martin said Monday. Holding off follow-up flows for months would leave endangered humpback chub fish, sandbars used by river rafting trips, and archaeological treasures at river's edge diminished "almost to the point of no return," he said."
Re:Don't worry about it (Score:2, Informative)
Thats why here in AZ I wore a t-shirt Clear till Mid January. Oh ya.. I'm wearing a T-shirt now, too =)
Anyway, I think its too early to dismiss global warming like you are doing. I agree that the earth is robust, but seasonal extremes is one predicted outcome of this scenario.
Re:enough sediment (Score:3, Informative)
Re:How is this different from .... (Score:3, Informative)
Re:Don't worry about it (Score:4, Informative)
Re:enough sediment (Score:5, Informative)
The Arizona monsoon floods were not necessary to keep species from collapsing, the river always had a huge sediment load that was inimical to species like trout that need clear water. Thus there was basically no competition for habitat until Glen Canyon Dam turned the water clear. All that the artifical floods do is churn up the 'monsoon' deposited sediment from the bottom and move it up onto the existing and previously existing beach sites, benificial for plant and animal habitat. It does nothing for the hump-back chub because in very short order the water will run clear again. And the previous 2 floods have demonstrated that these newly deposited beach sands do not stay long. As long as the Colorado River through Grand Canyon runs clear it will scour and carry away sediment to Lake Meade.
I am not sure what you mean in the sentence fragment "...before they need to dump sediment for the Dam's sake...", but no sediment is being removed from behind the dam. In fact, geologists estimate that it will probably be only a couple of hundred years before lake Powell is full of sediment and the dam will become a waterfall. The waterfall will then undercut the damn pretty quickly, as it has undercut lava flows in the past, and the dam will be gone.
As for the articles comment that half the camp sites in the canyon are disappearing, this only refers to camp sites used by river runners. If you backpack in the canyon back country, the best place to go, you will find an unlimited number of camp sites.