September Science readings.

September Notes Page

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Articles studied this September - some of which might go to Slashdot.

DART impacted

Doggerland Bathymetry

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September science readings.

2/3 the way through the months, and I've not written a word, Even though I've got 4 things open on my desktop, and haven't touched ArXiv for most of the month.

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NASA impactor "DART" hit it's target.

link

DART is a part of a mission to attempt to examine how efficiently an impactor (the DART body) transferrs momentum to the (probably) not-very-solid body of the asteroid's "moon". For many ideas about how to deflect bodies on a impact trajector with Earth, this is important data.

According to Hollywood, this will always work ; reality may differ from Hollywood [shock! horror!]. That is why the experiment has been carried out.

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Doggerland Bathymetry

For people's information : a seabed map of the "Doggerland" region, countoured at 10m isobaths.

Yes, compared to the main part of the North Sea, it's shallow. But that's still not particularly shallow - the shallowest contour on this map is at 20m, around twice the area is enclosed by the 30m contour. That's about 10kyr ago in terms of post-glacial sealevel rise.

Note the "grooved" structure to the seafloor, which is regions of currently active tidal scour. Power cables, pipelines and turbine bases in areas with scour like this need extensive (i.e. expensive) armouring with concrete-filled sand bags etc to avoid the structures being undermined by erosion.

The "Silverpit" seabed structure (a fishing ground) is prominent between the Dogger Bank and the coast of Norfolk.

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