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Creative Commons License
Where the stuff on this blog is something i created it is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License so there are no requirements to attribute - but if you want to mention me as the source that would be nice :¬)
Showing posts with label ocean. Show all posts
Showing posts with label ocean. Show all posts

Tuesday, 8 January 2019

27min @TheEconomist clip - Can #conservation save our #ocean ?


Text from youtube "The ocean is facing its greatest ever challenge - overfishing, pollution and climate change are all threatening the health of a resource on which the whole world depends.

he crew of this ship is on a mission to try and save one of the most endangered sea creatures on the planet. They’re in the middle of a marine protected area in Mexico - a conservation zone where certain types of fishing are banned. Local fishermen are poaching a species of fish that is so highly prized in China, they can make tens of thousands of dollars in just one night.

With ocean life under threat from overfishing, pollution and climate change, could marine protected areas be the answer?

Near the Mexican fishing town of San Felipe, on the The Upper Gulf of California ...Conservation group, Sea Shepherd is working with the authorities to help enforce a Marine Protected Area - or MPA. A designated section of ocean to be conserved, managed and protected. Maintaining rich, diverse ecosystems is key for the health of the Ocean - and ultimately the survival of humanity.

But ocean life is under threat. From plants to micro-organisms and animals, species are disappearing forever. M

arine Biologist Patricia Gandolfo and the rest of the Sea Shepherd crew are here to stop poachers. Caught up in the nets of the criminal gangs and local fishermen is one particularly rare porpoise - the Vaquita.

Worldwide there are thousands of sea species currently threatened with extinction. Losing just one species from the food chain can have a disastrous effect on an entire ecosystem. After it’s sold on, the Totoaba’s swim bladder can fetch up to $100,000 a kilo in China, where it’s prized for its medicinal properties.

Critics disapprove of Sea Shepherds use of direct-action tactics in some of their campaigns, but in the Gulf of California, their presence is welcomed by the Mexican government.

Globally, the fishing industry employs 260 million people, but many more subsistence fishermen depend on the ocean for their income. Local fisherman here claim protecting the ocean has limited how they can fish, destroying their way of life. Yet doing nothing may ultimately present more of a threat to their livelihoods.

Currently Marine Protected Areas make up only 3.6% of the world’s ocean but a growing number of scientists are calling for 30% to be protected by 2030.

Cabo Pulmo now has a thriving eco-tourism and diving industry. The environmental rewards provided by the MPA to the local community have been valued at millions of dollars a year - Far more than they ever made from fishing.

The ocean is facing its greatest ever challenge - overfishing, pollution and climate change are all threatening the health of a resource on which the whole world depends. Marine protected areas can come in many forms.

But if they are to be effective, they must align the need for conservation with the needs of those who depend on the ocean for survival.

In order to avoid disaster–and to ensure a sustainable supply of fish for the future–far more of our ocean needs urgent protection.

Thursday, 12 April 2018

1min @circulareconomy clip - New #Plastics Economy: #Circular Materials Challenge


Text from youtube "How do we stop millions of tonnes of plastics entering our oceans every year? Despite innovation, collaboration and investment to clean up waste, the three biggest clean ups tackle less than 0.5% of the plastic entering the ocean each year. We need innovation that tackles the root cause of ocean plastics, and not just the symptoms. Our $2M Innovation Prize winners demonstrate some of the possibilities to radically rethink the ways we make, use and reuse plastic packaging."

Friday, 15 December 2017

30 sec animated clip - if we pulled out a 10m plug that was at the bottom of the #marinas trench what would happen


Text from you tube "A simulation of draining the world's oceans by pulling a hypothetical "plug" in the Marianas Trench, inspired by the work of Randall Munroe of XKCD: https://what-if.xkcd.com/53/ "

Text from this reddit string of posts "A few years ago I bought the book What If? by Randall Munroe of XKCD fame, which included a map showing what would be left of the world's oceans if you pulled a 10m plug in the Marianas Trench. He did a post about it online here as well. I decided to build a model (likely similar to what he built, given the similarity of the final result) that would allow me to animate it.

I used the ETOPO1 Global Relief Model, which has a pixel size of about 1.8km across. It's the equivalent of a 233MP photograph in size and includes of the earth's elevation and bathymetry (i.e. ocean elevation). I also used the Natural Earth Oceans and Lakes + Reservoirs data sets from here. Much of this data was combined or converted between vector and raster using various GDAL tools, whose scripts you can see here. 

Most of the processing was done using GeoTrellis in Scala. Full source is here. The key was a scanline flood fill algorithm (a fancy term for the paint bucket tool you might have used in MS Paint) that was adapted from Lode Vandevenne's work, which was modified to support wrapping at the edges so that it could be used on a globe. It's here in the source.

The math for calculating the time is based on a simplified version of the Bernoulli incompressible flow equation. Basically, the volume of the water that drained divided by the flow rate calculated from this equation. It can be seen here. It slows down near the end because each frame represents a 10m drop in the ocean, which takes less time as the volume of accessible water decreases.
If you're interested in a less brief and easier to understand explanation of all this, let me know and I'll put a blog post together covering the technical side in a more digestible way.

Also, for those asking:
  • Here's a video version to make it easier to view for some
  • It's going to Mars
  • Other oceans aren't necessarily deeper than the Pacific, they just get landlocked and stop draining
  • Many lakes will likely stick around since they are fed from rivers and direct rainfall
  • The continents drift, but not that much, over this time span
  • The plug is 10m in diameter (that's metres, for the Americans)
  • No, there's not actually a plug