Monday, November 24, 2014

11/24/14 Report - Watching Surf And Sand Movement. LIDAR Discovers Roman Gold Mining Nework. Beach Detecting Conditions Rating Downgrade.


Written by the TreasureGuide for the exclusive use of treasurebeachesreport.BlogSpot.com.

Breaking Wave As Seen Saturday Morning Near High Tide
Notice where the wave in the above picture is breaking, and where the water is flat in front of that.  That is where the water is moving over sand in front of the beach, and the rough water near the bottom of the picture is where the water meets the bottom of the slope and the water coming back down the slope.

There are three things I want you to watch in the following video.   First, where the waves are breaking.  Second, where the water surges over the sand in front of the beach after breaking.  And then something you didn't see in the above illustration, how it surges up the slope until it hits the cut and then back down again.




video


Here it is with lines and arrows added to show the area where the waves are breaking, surging across the bar and where the incoming water hits the water returning down the slope near the bottom of the slope.


You can clearly see where the wave is breaking (top horizontal red line).  That is where the water gets shallow enough  for the wave to break.

Then the surge across the sand in front of the beach (from the top red line to the blue line).

Then the rough water where the incoming water hits the water returning down the slope.

When you see waves breaking way out, you know the water is relatively shallow that far out. 

The waves at this beach were breaking fairly close to shore.  You can get an idea of where the water is deep and where there is a lot of sand from where the waves are breaking.  

The illustration immediately above is from six seconds in on the video.

Here is an illustration from sixteen seconds in where you can see the slope better.


The top line shows general area where the sand builds up and the waves are breaking.  The second line shows the approximate beginning of the slope.  And the arrows shows the slope where the water goes up and returns.

The angle of the video and perspective makes this difficult to diagram and illustrate, and I know that I didn't explain it very clearly.

One of main points is that you can tell a lot about where the sand is and how deep it is by where the waves are breaking and how the water is moving.  That is useful information.  Always figure out as much as you can about how the sand is moving. 

There is a lot more that you can see in this video, such as the angle of the waves as they hit the beach.

Here the waves are breaking closer to shore than some of the other beaches.  The sand in front of the beach will have to be moved or at least stirred up to uncover the older materials before they can be washed up. 

The next day (Sunday) a good number of coins were found on this slope in front of the cut.

I hope you got something out of that even though I didn't couldn't make it real clear. 

I advise watching the video a few times after reading this.

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The most "google plused" post of October was the 10/4/2014 Report -  Tuning A Pulse Induction Metal Detector For Gold.  Permit To Take Photos In Florida.  Higher Surf Coming.

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Hidden under the vegetation and crops of the Eria Valley, in León (Spain), there is a gold mining network created by the Romans two thousand years ago, as well as complex hydraulic works, such as river diversions, to divert water to the mines of the precious metal. Researchers from the University of Salamanca made the discovery from the air with an airborne laser teledetection system (LIDAR).

Here is more about that.

http://www.agenciasinc.es/en/News/Laser-from-a-plane-discovers-Roman-goldmines-in-Spain


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I got out to take a look at the beach this morning, and I am downgrading my beach detecting conditions rating back to a 1 (poor).  Beaches that eroded are filling again.

On the Treasure Coast the wind will be from the South for a couple of days and the surf will be slightly reduced.

Wednesday we'll have another front coming through and the wind will shift again and be coming from the North again but at the time the surf will be only around two or three feet.

I'll probably be going back to a "1" rating on my Treasure Coast beach detecting conditions rating scale before long.  I'm actually surprised that the beaches haven't refilled more already.

Happy hunting,
TreasureGuide@Comcast.net