Chapter 4
ARTICLE IV. REGULATION OF RECREATIONAL BEACH AND WATER ACTIVITIES
Sec. 22-54
Sec. 22-51 Definitions
Also Chapter 14
Sec. 14-1
Also Chapter 22
Article III
Sec. 22-39
Sec. 22-40
Edit: the above sections address camping, which includes most beach stuff that is often left on the beach overnight. You can do a search and find additional rules regarding "obstructions," which would include anything else other than litter and camping goods. The obstacles are objects that could block the path of an emergency vehicle or Sea Turtles.
Edit again:
Here it is:
Chapter 22
ARTICLE IV
Sec. 22-54.
(g)