Beach re-nourishment is NOT necessarily all bad...
I started detecting Feb of 2011, I did really well that first year with my ACE250 and its' DD coil. Got some 14+ rings and nearly $200 in clad. My first gold ring came December of that year (Christmas day in fact) and then in January 2012 I heard they were going to re-nourish our beaches. Some of the old detectorists that I'd bump into on the beach all moaned and groaned about how we were FINISHED detecting...
Well, the re-nourishing happened and I continued to detect, and my finds DID go down, at least until I changed my style of detecting. Instead of grid searching the areas in front of the rental loungers to the water, I was told by my hunting buddy (with some 20 + years of detecting) to work a zig zag sawtooth type line down the beach and cover longer stretches of beach. So I did, and it really paid off. I would go for some ways with very few targets at all and then all of a sudden I would hit a "patch" of targets, This patch would be about 3 to 4 feet wide and some 10 to 15 feet long. That's when I would do a 10 x 20 grid pattern. The only thing I can think is that the sand that got dredged up from the Gulf contained all these targets, got dumped onto the beach and spread out by the bulldozers. Some of these patches would hold 20 or 30 coins and there would be 3 or 4 patches a hunt. Some were higher and some were lower on the beach, but they were there.
Another trick I learned was to hit the area of the rental chairs. On our beaches the rental guys move the chair line every few days, if you hunt just in front of or just behind them, you'll be hunting the area that the chairs had sat over for a few days.
So, just because they re-nourish your beaches, don't give up. You'll have to try some new methods and work for it but it'll still be rewarding. Then too, there will still be recent drops to get too.
Oh, yeah, after I changed my style I averaged $5 and change a day plus I got another couple dozen rings. By the end of that year though, I had gotten into some serious water hunting and do very little dry sand beach in the summertime now.
GL & HH!
It is all 10 feet below the surface. 
Remember to bring your crusty pennies to leave behind for the locals to dig. 
