How long does beach erosion last?

MBbeachrat

Sr. Member
Apr 1, 2011
361
79
Melbourne Beach and Bethany Beach-- Snow Bird
Detector(s) used
CZ 21, Whites DF PI, Excalibur II, CTX 3030
I only been doing this for six months (at least 4 hours a day). This information is not from me, but from a local treasure hunter who has found many gold coins and bars with his MD. He told me a story of one day finding around 700 hundred coins and decided to go home get lunch, warm up and shower. He was back in two hours and the sand climbed three feet and he could not find a thing. The last major hurricane in Florida where I have a place on the East Coast south of Melbourne Beach filled in after the first day. All the MD guys found many things the first day but the second was slim pickens!
I hope this doesn't happen all the time, I really don't know, but these are to examples I am sure about. The best MD hunter I know says," best time during the storm second best just after."
 

Tom_in_CA

Gold Member
Mar 23, 2007
13,837
10,360
Salinas, CA
🥇 Banner finds
2
Detector(s) used
Explorer II, Compass 77b, Tesoro shadow X2
beach-rat, thanx for the info. I'm not from the east coast, but will take a stab at this Q from a west coast perspective:

Yes, the beach can sand back in with a SINGLE tide. Other times, if the surf is remaining semi-rough, it can last a few days. But yes, I have seen where we've gotten hundreds of coins and targets, as fast as you can dig. Then return the next day, and you're lucky to get a single signal EVEN THOUGH when you left the day before, you KNOW you left signals all around you, but only left because you had to go to work, or your batteries were dead, or whatever. The sand simply came back in, and they're all over a foot deep now.

But there are anomolies I've seen on the west coast, so perhaps this is true of the east coast: Sometimes when conditions are SO severe, that the storm reaches way back in the dunes, and erodes into sand that hasn't seen salt water in decades (because it's been back in the high-&-dry zone for sooo long), that the following happens: The water goes back into the dunes, making lagoons and a mushy mess back up high, and seeming to have no impact on the inter-tidal zone. But sometimes, when this "up and over" effect occurs, we come back a few days later, and find that mother nature is THEN adjusting her slopes, to accomodate for the earlier effects, and she's filling in off-shore low spots that resulted from the storm. In this "post storm rearrangement" of sand, the coins can start appearing on the slopes.

And this can continue to happen for weeks afterwards.

But if you're talking about severe vertical slopes (and not sloshing water way back high in the dunes), where the "mark" was immistakably chosen by the storm, then I have not seen this "post-storm" re-arrangement happen. In those cases, when the sand goes soft at the base of those cuts (which can happen overnight), then ......... it can go quickly.

Thus I'm usually right out following the high tide that is during or directly after the swells/waves are hitting (sometimes in pouring rain and wind). And then yes, will continue to check for days following, if I suspect that the "post-beach" arranging will go on from mother nature.
 

OBN

Gold Member
Dec 30, 2008
6,529
7,010
Maryland Waters
🏆 Honorable Mentions:
1
Detector(s) used
"Excalibur"..
"AQ" Impulse
Primary Interest:
Other
Re: How long does beach erosion last? NO time limit

A Great Writing By SeaWeed Ray
http://www.outerbanksnc.net/ship.html

At one time I thought all coins found in the wet sand and in the water were, indeed, headed out to sea. I like to say the more I learn the less I know.
John
============================================
You 'hit the nail on the head' for me, too, John. I have studied the Outer Banks beaches (NC) for many years, as part of my metal detecting hobby and can say, without a doubt, that I don't fully understand what makes certain movements of the sands, materials (including coins/jewelry) occur at the time and manner in which they often do. I will debate with anyone....that beach metal detecting is one of the most difficult of the hunts connected with the hobby. Unlike highland hunting, where the targets lay, generally undisturbed from the time they are lost and later recovered.....beach targets are, most often,constantly on the move.. I have reached the point, after many years of beach hunting, where I categorize our beaches, pretty much by the four seasons... with a much broader description being a 'summer beach' and a 'winter beach'.. Both are as different as 'sweet' and 'semi-sweet' chocolate!!.. However, I will say that I am predominantly a 'winter beach' hunter.. ..due to several reasons...the main one being the higher degree of erosion and greater probability of discovering the 'older/true artifacts'.. Silver coins and older jewelry are nearly impossible to find on NC beaches during the summer months....Recently dropped clad coins and new jewelry...are the only sure bets.....and even they, in my opinion, are not as easily found until the late fall and winter months..Water hunting (wading over knee deep) on our beaches is difficult, if not impossible during 90% of the summer days...due to constant onshore waves, the sudden drop-off of the beaches and bad rip-tides, which often result in closing of the beaches for swimming. However, these same elements add greatly to the 'erosion factor' during the winter months.. of course, as they occur with much greater force.

I am positively convinced that it would be impossible to write a comprehensive article on beach metal detecting, with facts and/or pointers that can hold true for every beach around the country and world... I've tried it.....and each time I find myself making statements which I know to be true for 'my beach'.....but find to be unreliable for other beaches I have hunted or read about.. Obviously, we will agree that 95+% of all lost coins (excluding shipwrecks). ..were first dropped on dry land (sand)...But, we also know that many of these coins were washed into the sea..and returned to land, often many times before they were recovered.....It is what happens during that in-between time ....that may be difficult to understand. Here is my 'take' on the NC beaches.....and you may find it interesting..and certainly may not agree with some of it.....It is however, a conclusion, that I have reached...after many, many years of beach hunting.... MOVEMENT OF BEACH COINS/JEWELRY ON THE NC (OUTER BANKS) BEACHES 95+% of all coins/jewelry lost.....are dropped during the summer months of June through September....98+% of these coins are lost on the high dry beach sand. A large amountof these coins/jewelry is picked up by summer metal detectorists.. ..with the largest amounts foot-trodden deep into the sands.....or picked up and pulled to sea by an ensuing tide. (I will add here that I feel that only a minute percentage of the unfound summer coins find their way into the ocean during the summer months. And these are the ones which are lost at that point between the high tide line and the ocean, or those lost by someone trouncing around in the shallow waters near the shoreline. There are practically no coins washed onto the beaches during the summer months.. ...while there may be a few coins found in the wet sand (that sand between high and low tide)..during summer months...those coins are predominatly newly lost coins which have endured very little movement.....and for all practical purposes have not 'been to sea'.... The prevailing summer winds on NC beaches are out of the 'southwest'..these winds do not 'blow the ocean level' back, as offshore winds may do...on say ..Gulf Shore or shallow-water beaches...instead, they result in a very direct onshore wave action...which will take the 'outer bars' created by winter weather and push them gently onto the beaches....bringing 'new sand'....with them... and little else in the way of other materials.....Summer sand on the NC beaches is very clean and usually void of many shells and other materials.. It is not until fall (late Sept.)...that more prevalent northeasterly winds begin to blow.....resulting in higher tides...which begin to 'strip' the beach of its 'summer sands'.....uncovering many of the deeper foot-trodden coins lost during the summer..... sweeping many more of them out into the waters.. (how do they return?...we'll see later, below) As a regular beach hunter....it is very easy to determine when the above is occuring.....almost to the point where I can tell when the 'current summer season's coins have disappeared.....and coins several 'seasons old'.. ..begin to make their appearance!!.....aside from the obvious appearance/condition of the coins themselves!!......It is when the summer beach sand disappears that beach metal detecting is at its finest!!!!!! You recall that I said above that I believe that very few coins either 'go to sea' or are 'returned from the sea'...during the summer months.. Of this factor......I am postively sure (in my mind, at least)....after 20+ years of trekking NC's beaches.... Now, using the two broader terms of describing beaches.... that being 'summer beaches'..and 'winter beaches'......what is occuring on NC's beaches during the winter months? Beginning in late September and running through mid to late April...NC's beaches are going through a constant (sometimes almost daily)...stripping, eroding, rebuilding......stripping, eroding, rebuilding...process....until ....around Jan. or Feb. the erosion process...has gained on the rebuilding... which usually follows.....to the point where the beaches have reached their lowest point of erosion. During March and April, the rebuilding cycles will outgain the erosion cycles..until early May....when the summer beaches will begin to rebuild. OK!!!!!...the trick to winter beach metal detecting.... simply is to catch the beach...during those prime winter months (Sept./April) ...when the erosion cycle is occuring!!...Simple enough.....watch the weather, the wind direction, the times of the tides, the time of full moon (important!!), WATCH THE BEACH!! A beautifully eroded beach can be totally ruined by just one 'high tide'.. on a beautiful winter day!!.....one or two inches of new sand may be all it takes to turn a 200+ coin day.....into total ZILCH HUNTING!!..."You should have been here yesterday!"...applies to beach metal detecting, just like it does to fishing!! Enough rambling.....but one last point I want to make which very may well intrigue a lessor student of beach metal detecting...and may bring forth argument from some of the more serious ones. I have dug coins on the beach during the winter months which, I know have been to sea and back to the beach many, many times...before they were finally recovered....modern coins which were worn, almost to the point of being unidentifible.....yet vintage coins (1600's)...which looked as good as the day they were lost!!!!!.......Why?......How do shipwreck coins find their way to the beaches?......When do modern coins wash ashore? Last first..... Remember, I believe coins leave the beach and wash ashore, mainly during winter months (in NC)....they leave the beach, obviously, when the storms and heavy surf strip the beach of more than minute layers of sand... More importanly, when do they come back???? I believe that (during winter months)...coins are being washed upon the beaches at times WHEN THE BEACHES ARE ACTUALLY ERODING.....NOT REBUILDING.. ...does this seem strange??....not really.....yes, the beach does go through a small amount of rebuilding during winter months.. but while is throwing new sand up on the beach...it IS NOT THROWING UP COINS...this can be proven by the fact that, as I said earlier, YOU SHOULD HAVE BEEN HERE YESTERDAY, REMEMBER??....after heavy erosion, during the winter, when things settle down...the beach usually rebuilds, slowly until the next storm...I never, I REPEAT, NEVER,....hunt the beach during this phase.. ....because the coins simply are not there!! How can coins be washed upon the beach when the beach is eroding? Simple...These coins have been pushed into the deep trough which lays close to shore during the winter months....they lay there for days, months. ...being tossed about and aggitated ....as if being in a washing machine.. At times when the ocean currents (and thats another story..because its ocean currents more than wave action that erodes the beach)...are eroding the beaches.....these coins are pushed to the very edge of the beach drop offs....where they will be 'flipped up on the beach' AT THE CHANGING OF THE TIDES, LOW TIDE TO HIGH TIDE,.....at times when erosion is actually occuring.....It is at this time, on low tide,......when the the greatest concentration of coins can be found washed ashore on the beach!! I have hunted the beaches at these times when....it was tempting to just lay the detector aside....and eyeball and pick up coins!!!!!....I am sure others have, also. TO REPEAT AGAIN, DETECTABLE COINS ARE WASHED ASHORE ON NC BEACHES, DURING THE WINTER MONTHS, IN EXTREMELY GREATER NUMBERS THAN SUMMER MONTHS, AND ARE PUT THERE DURING PERIODS OF BEACH EROSI0N...NOT BEACH REBUILDING!!... OLDER, VINTAGE COINS, SHIPWRECK COINS..... I am not an ocean salvor, scuba diver....or treasure hunter....in the "Mel Fisher" sense of the word.....I have, however, found my fair share of older, shipwreck coins along NC's Outer Banks.... I have noticed, of late, a newer theory emerging among some of the Florida beach hunters....that many of the 'treasure coins' yet to be found on Florida's Gold Coast....are not, yet to be washed ashore....but are already there!!!!!!!.....laying beneath the high dunes....and below the very sands which are trampled on, every day of the year!!! I say, 'welcome to the club'!! My hunting colleagues and myself..have determined some time ago...that there are very, very few, if any,......ancient shipwreck coins 'washing ashore' along NC's shorelines today...There may be, and no doubt are, many ancient shipwreck coins laying beneath NC's oceans...But, if they have found their way onto the beaches during these modern times.....I am not aware of it... We do, however, find a good number of 1600/1700/1800 coins on NC's Outer Banks beaches......but, we find them after many, many hours of winter beach hunting ...when we are able to find the areas where, obviously....shipwrecks landed ON THE BEACH...in years gone by... We have shipwrecks marked on the beaches....many of them to become uncovered.. ..only every few years...and for only a day or two at a time....or perhaps just a 'plank' or 'ship's spike'...popping up.....but they are there...you just have to be there at the right time!!!! To close that topic....I believe that 99% of all shipwreck or ancient coins to be found on NC's beaches are already there.....and have been there for hundreds of years...waiting for the right person to find them.....at the appropriate time.....when the eroding beach...will let them appear... In closing, I wouldn't trade NC's Outer Banks beaches for any that I am aware of....even Florida's wonderful Treasure Coast!!!.....
Seaweed(Ray Midgett)Copyright
 

Da Sand Crab

Bronze Member
Sep 16, 2009
1,361
247
Far, Far Away
It's a mystery I wish I could predict and understand but it's unpredictable.
My motto is get while getting is good.
It can all change in a matter of hours.
 

Sandman

Gold Member
Aug 6, 2005
13,398
3,992
In Michigan now.
Detector(s) used
Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca
Primary Interest:
All Treasure Hunting
Great post Joe. Many don't understand conditions are not the same all over.
 

Top Member Reactions

Users who are viewing this thread

Top