5/20/17 Report - Why Nor'easters Move More Sand and Coins: A Small Scale Video Illustration.

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

Erosion I Found Yesterday

It is not often that I am able to capture such as good image of such a basic and important thing. Usually I don't have my camera, or the batteries or dead or for some other reason I just can't capture the image in a way that shows what I really want to show.

Yesterday when I was out I hunting, I saw the above little eroded cliff. I made a very short video that shows how water hitting the beach at a sharp angle slices away the sand.  That is something I often talk about, especially as it relates to Nor'easters.

This erosion is on a very small scale, but the small scale and the clarity of the water, worked out for the better.  The same thing you see in the video below happens on the beach on a much larger scale when the surf is larger.  I think you can see from that video how the water slices along the front of the cliff.

Here is the link to the video.  Take a look.  It is only nine seconds.

https://www.youtube.com/watch?v=I8aCk1zC0e4

Notice how the water speeds along the face of the cliff.

I suggest running the video and few times and watching how the water skirts long at the base of the cliff.

At the end, you see multiple steps in the sand.  The steps were created as the tide went down.  Some steps are greater than others because there were times when the waves were bigger.

Below is a an illustration of the eroded area and the neighboring beach. The general direction of the water adds sand in one place and removes it in another.  If the direction of the waves changed, the sand would be removed and added at different locations.

The curve in the beach is important.   To the right of the illustration, sand was accumulating.  It was only eroding where the water was hitting at an angle (orange line).

The water hits the cliff and bounces back off the cliff.  That water bouncing off the cliff then gets pushed along the face of the cliff by incoming water.  On the leading edge of the rushing water, you see a little swirl created where the wave pushes the water that is bouncing off the cliff.

I was glad I caught that on video.  I often see something I want to talk about, and for one reason or another, don't catch it on video.  On this small scale, it was pretty easy to see what was happening.

The movement of sand on the beach is multi-directional.  How the incoming and outgoing water interact is important.

When the water hits at a sharp angle, as in the video, there is a redirection of water as the outgoing water hits the incoming water.  When it is hitting at a sharp angle, there is not so much of a collision as when the water is washing directly up and down the slope.  When the water is hitting at a sharp angle, there is more of a combining and redirection rather than a collision that severely reduces the force of both the incoming and outgoing water.  In some areas it actually appeared that the two sources added together and added to the overall force.  There were times when the incoming and outgoing water combined to create a swirl that moved along the beach near the front of the combined sources.  The sand appeared to suspend more in the area of the swirl.

Clip From Another Video Segment

In the above illustration you can see the direction of the incoming water, the outgoing water and the area where they were gathering (arrows).  That area is where there appeared to be the most sand suspended, for the area at the base of the cliff when the water hit it with some force.  The swirl moved parallel to the beach for a short distance.

As I've discussed when I talked about trigger points and drop points, what is moved by the water is determined by the amount of force.  The small amount shown in this video moved sand but would not move coins - other than those that might happen to fall out of the bank.  If you understand the movement of sand and other objects on a beach you'll know better when and where to look for coins.

---

This looks like it would be a good read.

The Wreckers: A Story of Killing Seas and Plundered Shipwrecks, from the 18th-Century to the Present Day Hardcover – July 14, 2005, by Bella Bathurst.

Unfortunately you don't get much of an online preview, but here is the link.

https://www.amazon.com/Wreckers-Killing-Plundered-Shipwrecks-18th-Century/dp/0618416773

---

The most read post of April was the 4/27/17 Report - More On Cooper's Treasure Show. Salvage Lease Process In The Bahamas. Blog Provided Touch of Home to Deployed Detectorist.

People have been going back and reading a lot of the old posts.

---

Happy hunting,
TreasureGuide@comcast.net

10/12/14 Report - New Storm Likely To Develop Soon. Video Demonstration of Effect of Metal Detector Coil Sweep Angle and Object Position.

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

Gold Ring Used in Today's Demonstration.

There is some big weather news, but first I have something else for you.

Today I have a very good video demonstration for you that clearly shows some things that I've talked about in the past but also illustrates additional important information.   The video shows how the sweep angle and position of various objects can affect a metal detector signal.  Using that new information will help you better understand how your detector works and what type of object you are detecting.

For this demonstration I used the Ace 250 because it is well suited for this purpose.  I used All Metals mode.

Other detectors will give similar but different results.

I used three test objects: a screw, a thin rectangular copper tag, and a thin gold ring.

First I put them all flat on the ground.   I swept my coil over the first two in one direction and then at roughly ninety degrees.

I did not bother to change sweep directions on the ring when it was laying flat because it is nearly round and the sweep direction would not make any difference.

The video shows the different signals you get when you sweep over an oblong object such as a screw in one direction and then again at a 90 degree angle.

The next part of the experiment involved standing the rectangular copper tag and the gold ring upright.

When the tag was put on end, it gave a signal like iron instead of the coin-like signal it gave when laying flat.

The ring when standing on end, gave a broken signal when sweeping in one direction and a solid signal when sweeping the other.  That was very much like the signals given by the screw laying flat.   When the ring was standing up, it presented an oblong surface to the coil and gave a signal like what you would expect from an oblong object.

You can tell quite a bit about objects from the signals.

Here is the link to the demonstration video.   Pay close attention to the signal and tone over each object.  Notice how the signal changes when the sweep angle changes on some objects and how the signal changes when some objects are stood up.

http://youtu.be/1L96xy9nRZo

The most important things that I'm showing today is that the sweep angle will affect the signal, as does the position of the object in the ground.

If the copper tag was pushed into the ground at a forty five degree angle instead of straight up and down, it would give an even more variable signal.  And if it is bent, the signal is even more variable.

The most simple case is a round object, such as a coin, laying flat.

In the past I've talked about how you can identify oblong objects such as nails with detectors such as the Minelab Excalibur.  Sweeping in one direction you'll get a broken signal, while sweeping at ninety degrees will give you a solid signal.  You could see a similar thing with the screw in this video and also with the ring standing up using the Ace 250.

Although the Excal and Ace are different in many respects, they both identify long thin nail-like objects with a broken tone in one direction and a solid tone in the other direction.

I can always identify a nail or similar object with the Excalibur in all metals mode.   The Ace reacts similarly.



Source: www.nhc.noaa.gov

You should now better understand why the signals of some objects are so variable and some of the factors that can cause that.

The signal can tell you a lot if you really understand your detector.


On the weather front, Fay is heading out into the Atlantic and away from the Treasure Coast, but what I've been calling Disturbance 1, now has a 90% chance of becoming a cyclone, and it looks like it will be moving towards us.

As I've been telling you, we often get some good hunting in October or November.

That is something to watch.

Happy hunting,
TreasureGuide@Comcast.net