beachcomber       
noun [ C ] uk/ˈbiːtʃˌkəʊ.mər/ us/ˈbiːtʃˌkoʊ.mɚ/
 海滨拾荒者(或寻宝的人)
a person who walks along beaches looking for objects of value or interest
  The area is popular with surfers and beachcombers.
 Some beachcombers use metal detectors.
  - More examples
 - Sometimes shark tags have been found and returned to researchers by beachcombers.
 - The discovery of artefacts from a 17th century whaling site has fuelled excitement among historians, archaeologists and even casual beachcombers.
 - Any flotsam and jetsam that came ashore would be snatched up at once by beachcombers.