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Scientists, environmentalists, and anyone who lives within a hundred miles of the winding Mississippi River will tell you�have told you, repeatedly, for years�that efforts to tame the river have only made it more feral. But scientists would like more than intuition, more than a history of 18th-century river level gauges and discharge stations, more than written and folkloric memory.

They would like proof. Luckily, rivers inscribe their history onto the landscape. Basically, the Mississippi meanders. Sometimes the aluminum boats mississippi jam curves around so tightly that it just pinches off, cutting across the peninsula and leaving the bigger aluminum boats mississippi jam high, if not dry.

That parenthesis of water alongside the main channel is an oxbow. In a flood, water churns up aluminum boats mississippi jam of sediment and spreads into the oxbow. In between: A peak of the radioactive isotope cesium markedwhen humans started testing nuclear bombs. They got, and on and on.

So they took core samples from trees, living and dead, in the Mississippi flood plain�the oldest going back to the late s. The ring damage matched. Not exactly, maybe, but close. They knew they were seeing floods for which no one had numbers. They published that work in the journal Nature Wednesday.

So climate change causes floods, right? Too easy. Overall flood risk has gone up 20 percent, the team says. But 75 percent of that risk comes from human engineering of the Mississippi for navigation and flood control. We can really show that the way the river behaves today is not natural. Even that Aluminum Boats Mississippi 30 look at the prelapsarian Mississippi may not change. Aluminum boats mississippi jam that flood control would lead to uncontrolled floods date back to at leastwhen a famous engineer named Charles Ellet Aluminum Bass Boats 400 warned in a report to Congress that the whole idea was going to lead to disaster.

Representatives for the Corps of Engineers did not return multiple requests for comment. Bob Crissa hydrogeologist at Washington University at St.

Criss definitely does buy the idea that engineering has made flooding worse. He says straight-ahead numbers like stage measurement the height of the river are enough to tell you. Levees upriver send more water downriver. Revetments move that water faster.

What might have been slow-spreading floodwaters when they were unconstrained turn into neighborhood-destroying mini-tsunamis when they burst all at once from behind failing levees. This is the problem with the Army Corps. Hence the pontoon boats. Rivers in the American southwest that run through bedrock and canyons, for example, leave much more evident traces�sediments and other stuff that researchers can more easily excavate.

Perhaps it will aluminum boats mississippi jam surprise you aluminum boats mississippi jam learn that attempts to regulate those floods has worsened them, as has climate change. If you have a super-big flood that exceeds the capacity of the levee, the levees make that worse. There have been bigger floods than people remember�but the landscape recorded.

And if humans learn to play those recordings back, maybe we can find a new way to get ready for the waters yet to come. A massive storm put Houston under water last year. A physical 3D model of the Mississippi River has to take into account all the human-built infrastructure. Sure, but it's not like climate change is making floods better. Adam Rogers writes about science and miscellaneous geekery.

Senior Correspondent Twitter. Featured Video. Topics flood mississippi river floods sediment disaster water.

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