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Why Do Rivers Curve?


Via Seth Dixon
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LEONARDO WILD's curator insight, December 5, 8:56 AM

El agua tiene su ritmo y pulsa al fluir, gira sobre sí misma. Cuando está en su ambiente natural y se le permite fluir y crear el ambiente por el cual fluye, crea los ríos sinuosos y serpenteantes y cuando esto ocurre, allí donde su dirección de giro cambia de dirección—rotación derecha, con el reloj, hacia una rotación izquierda, contra reloj—lo cual ocurre en las rectas, suelta lo que ha estado llevando y cargando en suspensión y esta material sólido se precipita. Asimismo, cuando el agua gira sobre si misma, se enfría, haciéndose más pesada. Es este tipo de movimiento el que hace que los ríos de las planicies serpenteen, más que cualquier otra influencia que haya "suavizado" sus orillas.

 

Water has its own rhythm and pulsates while flowing, it turns over itself when allowed to. When water is in its own natural environment and is allowed to flow and create its own space, it will create the sinuous rivers and when this happens, where its vortex direction changes—rotating clockwise or counterclockwise—it will release the silt and other materials it was carrying in suspension and they will fall to the bottom. Also, as it turns over itself, water cools down, becoming heavier. It is this motion that makes the plain rivers become sinuous, more so than whatever other influence that may have "loosened" its shores.

Sally Egan's curator insight, December 7, 4:27 PM

A very siual form using simple language to explain the meandering of rivers. Applicable to the course work on Hydrosphere.

YEC Geo's curator insight, December 7, 8:15 PM

Actually a very good video.  My one quibble is with the introduction, when the narrator talks about mountain streams "carving" their gorges.  The puzzle of how small streams could possibly carve out deep bedrock canyons is an ongoing research problem, and is difficult to resolve from a gradualistic perspective.

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Boundary conditions

Boundary conditions | Human Geography Too | Scoop.it
PULL a spring, let it go, and it will snap back into shape. Pull it further and yet further and it will go on springing back until, quite suddenly, it won't....

Via Joel Barker, Seth Dixon
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Joel Barker's curator insight, February 10, 2013 11:56 AM

A useful discussion on limits of the planet

Seth Dixon's curator insight, February 11, 2013 8:23 AM

This is an interesting article discussing the limits that the Earth's physical systems have and the importance not exceeding any tipping point that could destabilize the planet if we "overstrech the springs."

Angus Henderson's curator insight, February 11, 2013 11:49 AM

An interesting counter-balance to the work of the Planetary Boundaries group. 

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Full Extent of Africa’s Groundwater Resources Visualized for the First Time

Full Extent of Africa’s Groundwater Resources Visualized for the First Time | Human Geography Too | Scoop.it

Until now, there has been a lack of solid, comprehensive spatial data about African groundwater resources.  Researchers have now done so.  For a more academic article on the subject, here are their findings in Environmental Research Letters. 

 

Tags: water, Africa, resources, physical, environment, environment depend.    


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This 19th Century Map Could Have Transformed the West

This 19th Century Map Could Have Transformed the West | Human Geography Too | Scoop.it
Today's drought-riven west would look very different if Congress had listened to John Wesley Powell

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Seth Dixon's curator insight, June 11, 4:33 PM

Author of Mapping the Nation, Susan Schulten explains how western expansion failed to recognize the basic physical geographic reality of the United States--that the west is much drier than the east.  Given that much of the west, especially California, is in the midst of a severe drought, this article serves as a reminder to recognize that localized understandings of human and environmental actions are necessary.  Do you know what watershed you live in?  How does and should that impact us?   


Tags: physical, historical, California, water, environment.

Sylvain Rotillon's curator insight, July 1, 8:11 AM

We are very proud in France thinking we created the watershed approach with the 1964' water law, present basis for EU's water framework directive. Now, I would say that John W Powell is the true creator of watershed management. It's a blow to French pride...

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Boston's unnatural shoreline

Boston's unnatural shoreline | Human Geography Too | Scoop.it
Today's 100-year storm surge could be tomorrow's high tide.

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Seth Dixon's curator insight, February 5, 2013 3:05 PM

This set of maps and articles help to explain why sea level rise is such an issue for many major metropolitan areas.  In coastal cities with substantial economic development, much of the current coastal areas where once underwater until landfill projects filled in the bay.  During storm surges (or if and when sea levels rise) these will be the first places to flood.  


Tags: disasters, water, physical, Boston, weather and climate.

Charlotte Hoarau's curator insight, February 6, 2013 5:57 AM

Surging sea represented on an imagery background layer.

Color ramp should be graduated.

James Hobson's curator insight, September 10, 3:18 PM

Here's somehing to "Swett" over for those who live along the coast:

"Coastal cities are now living in what Brian Swett calls a “post-Sandy environment.” In this new reality, there is no more denying the specter of sea-level rise or punting on plans to prepare for it. And there is no more need to talk of climate change in abstract predictions and science-speak. We now know exactly what it could look like."

Keep in mind that as globalization expands, urbanizaion does as well, putting more and more people at this type of risk.