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Summary for Field Activity Number 1976-017-FA

Area of Operations: Rio de la Plata river mouth, western half of north Puerto Rico shelf, southwestern Puerto Rico, Escolla de Arenas, Isla Vieques, Puerto Rico, Caribbean Sea, United States, North America, North Atlantic

Dates: June 02, 1976 to July 29, 1976

Objectives: 1. Bottom sample transects on west half of northern shelf near Rio de la Plata river mouth. Conduct SCUBA observations off Rio de la Plata to see if hurricane-deposited surface mud layer remained. 2. SCUBA observation and sampling of southwest corner of Puerto Rico in sandwave area. Set stakes to determine rate of transport. 3. Preliminary bottom sampling and SCUBA observation near Escollo de Arenas, Isla Vieques to characterize large sand deposit, its setting and dynamics.

Type of Activity: Sampling
SCUBA diving
Sea floor mapping

Information to be derived: Grain size analysis
Sea floor mapping

Summary: 1. Western half of north shelf, June 2-18 and July 19-21, 1976: Bottom samples: 171; Surface mud layer gone from mouth of Rio de la Plata. Also good reconnaissance sample coverage of major offshore sand deposit, Isabella area. 2. Southwest corner sandwave area, June 27 - July 9, 1976: SCUBA observations of crestless sand waves; stakes set and surveyed in to measure sediment transport. 3. Escollo de Arenas, Isla Vieques, July 28-29, 1976: Reconnaissance sampling and observation of extremely dynamic sand transport of large offshore sand body and environs.

USGS Project Number: PR CO-OP

Contact: Rafael Rodriguez ()

Map for Area of Operations :

Map of field activity boundary.

Platform Info:
photo of JEAN A
JEAN A
MCKEE ZODIAC
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