Re: U.S. rivers changing color
[Re: hippie]
#7143078
01/18/21 04:15 PM
01/18/21 04:15 PM
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Joined: Dec 2015
Posts: 6,325 se South Dakota
NonPCfed
trapper
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trapper
Joined: Dec 2015
Posts: 6,325
se South Dakota
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I don't want to make this too technical, but optical sensors on satellites are only seeing part so the electromagnetic spectrum, mostly visible light and those readings just off of that, such as near infrared. The produced images are how light is reflected or absorbed on the surface. Often images are seen in various combos of "bands" that the satellite's sensor is using, just using blue, red, or green bands is pretty boring. Features can look pretty dull. Typically, one of the infrared bands is used, either as the "leading" band in say a 3-band combo, or somewhere in the combination. By changing the combinations, you can change the "colors" of the Earth features seen. So, when its reported, and remember if its a media report, they have to be able to translate what a scientist or technician is telling them--I've met some fairly dense reporters-- that the river is changing from "blue to green to yellow" is this over time, with the same band combos used, or is it one time but using different band combinations, or both...? It sort of depends.
As for nutrient pollution in rivers, point source pollution has been cleaned up a lot from say when the first Landsat satellite was launched in 1972. Non-point nutrient pollution not so much by say stopping such pollution but perhaps more from better nutrient management being done on the land. Decomposed fertilizer that is not used efficiency in land-use ends up being wasted money. "Precision agriculture" application of say crop fertilizer decreases the amount of nutrient pollution either coming overland into streams or through groundwater infiltration into streams. but its not across the board that all waterways have less nutrient enrichment. Its complicated...
"And God said, Let us make man in our image �and let them have dominion �and all the creatures that move along the ground". Genesis 1:26
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Re: U.S. rivers changing color
[Re: hippie]
#7143082
01/18/21 04:18 PM
01/18/21 04:18 PM
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Joined: Sep 2013
Posts: 10,404 Northeast Oklahoma
Mike in A-town
trapper
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trapper
Joined: Sep 2013
Posts: 10,404
Northeast Oklahoma
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The river I live on, the Juniata which use to be billed as the Blue Juniata is now green.
Years ago it had nice weedbeds along the shallow portions. Not hardly any now. Below the bridge leading into Port Royal its shallow and would choke clean shut with weeds. Don't see any now. Where at along the Juniata? I spent a few weeks up in the Huntingdon/Mt Union area in 2017 (IIRC) and would spend my Sundays off just driving around and hiking the state park there around Huntingdon. That's some of the most beautiful country I've had the privilege of seeing. I even bought a car while I was there. Mike
Last edited by Mike in A-town; 01/18/21 04:19 PM. Reason: I bought a car.
One man with a gun may control 100 others who have none.
Vladimir Lenin
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Re: U.S. rivers changing color
[Re: hippie]
#7143091
01/18/21 04:24 PM
01/18/21 04:24 PM
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Joined: Sep 2013
Posts: 10,404 Northeast Oklahoma
Mike in A-town
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trapper
Joined: Sep 2013
Posts: 10,404
Northeast Oklahoma
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Down river, around Port Royal. Bit north and east of where I was then. Mike
One man with a gun may control 100 others who have none.
Vladimir Lenin
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Re: U.S. rivers changing color
[Re: Andrew Eastwood]
#7143107
01/18/21 04:33 PM
01/18/21 04:33 PM
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Joined: Dec 2006
Posts: 41,592 Northern Maine
Bruce T
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trapper
Joined: Dec 2006
Posts: 41,592
Northern Maine
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Did otter show up at the same time as the decline in rats and fish? Don't know if it is coincidence or not, but when otter started showing up around here the fish and rat numbers in small tributaries started declining. Now that otters are very prevalent, rats and fish are almost nonexistent in those tributaries. The other thing I noticed around the same period is widespread use of herbicides instead of cultivation for weed control in farming. These herbicides running off may contribute to the decline in water based vegetation causing a decline in rat and fish habitat. These are the things I have thought about as to rat population decline and they could contribute the color change as well. Not here.Always been alot of otter here.
Nevada bound
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Re: U.S. rivers changing color
[Re: hippie]
#7143113
01/18/21 04:40 PM
01/18/21 04:40 PM
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Joined: Jan 2014
Posts: 4,148 Fontana KS
Andrew Eastwood
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Joined: Jan 2014
Posts: 4,148
Fontana KS
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Thank you Bruce. We just recently got them (otter), but it correlated with the timing of no till farming and river changes. If you have always had them and still had the changes, that would lead me to think the otter did not change anything. This information leans me more toward the herbicide idea, admittedly this was my strongest idea anyway. I remember many more weeds and grasses along the tributaries and rivers pre wide spread herbicide than what I see today.
Last edited by Andrew Eastwood; 01/18/21 04:41 PM.
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Re: U.S. rivers changing color
[Re: Bruce T]
#7143117
01/18/21 04:44 PM
01/18/21 04:44 PM
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Joined: Nov 2014
Posts: 1,922 east central WI
Dirty D
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trapper
Joined: Nov 2014
Posts: 1,922
east central WI
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I won't fish where it is catch and release.
good, less crowds and more fish for me.
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Re: U.S. rivers changing color
[Re: Andrew Eastwood]
#7143131
01/18/21 04:52 PM
01/18/21 04:52 PM
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Joined: Dec 2006
Posts: 41,592 Northern Maine
Bruce T
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trapper
Joined: Dec 2006
Posts: 41,592
Northern Maine
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Thank you Bruce. We just recently got them (otter), but it correlated with the timing of no till farming and river changes. If you have always had them and still had the changes, that would lead me to think the otter did not change anything. This information leans me more toward the herbicide idea, admittedly this was my strongest idea anyway. I remember many more weeds and grasses along the tributaries and rivers pre wide spread herbicide than what I see today. All that grass is the key to large populations of muskrats.
Nevada bound
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Re: U.S. rivers changing color
[Re: Dirty D]
#7143133
01/18/21 04:54 PM
01/18/21 04:54 PM
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Joined: Dec 2006
Posts: 41,592 Northern Maine
Bruce T
trapper
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trapper
Joined: Dec 2006
Posts: 41,592
Northern Maine
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I won't fish where it is catch and release.
good, less crowds and more fish for me. Enjoy.I'm fishing somewheres where I can catch something to eat.
Nevada bound
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Re: U.S. rivers changing color
[Re: hippie]
#7143136
01/18/21 04:55 PM
01/18/21 04:55 PM
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Joined: Dec 2014
Posts: 2,446 Tug Hill, NY
Squash
trapper
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trapper
Joined: Dec 2014
Posts: 2,446
Tug Hill, NY
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Here in northern NY some of our rivers are turning from blue to white, it’s called winter.
Last edited by Squash; 01/18/21 04:55 PM.
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Re: U.S. rivers changing color
[Re: Bruce T]
#7143761
01/18/21 09:12 PM
01/18/21 09:12 PM
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Joined: Dec 2009
Posts: 20,241 The Hill Country of Texas
Leftlane
"HOSS"
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"HOSS"
Joined: Dec 2009
Posts: 20,241
The Hill Country of Texas
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Only if it changed what grows there. It sure did here.Muskrats needs are food and cover. They do now anyway, when I was 16 years old any pond in a pasture with a few cat tails held rats and lots of them. Most of these didn't have a tree w/i a 1/4 mile but there were rats by the 5 gal bucket load- they only time they had cover was when they dove under which they did when they would notice you fishing or setting traps. This was after DDT had softened up all the birds of prey eggs.
I am not trying to Shanghai the original post but the only thing thing I see different in these exact same ponds is that there are birds of prey everywhere and not a single rat.
“What’s good for me may not be good for the weak minded.” Captain Gus McCrae- Texas Rangers
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