Such currents are c… Turbidity Current, turbidity current A variety of density current that flows as a result of a density difference created by dispersed sediment within the body of the cu… Density Current, density current Current that is produced by differences in density. See also Ocean circulation and currents Surf zoneīoundary Current, boundary current The northward- or southward-directed ocean-water current which flows parallel and close to a continental margin. Inexperienced swimmers should tread water and call for help. Experts advise swimming parallel to shore until you surpass the current, then head toward land. An estimated 80% of United States lifeguard rescues are due to rip currents. Attempting to swim to safety against the current can result in exhaustion, panic, and sometimes drowning. The intense currents can pull even the most experienced swimmer into dangerously deep ocean water. Telltale signs of a rip current include murkier or darker waters, changes in wave formation (large, choppier waves inside the current, calmer ones up front), and foam moving seaward.
Although often mistakenly called one, a rip current is not an undertow.
Rip currents are typically found near jetties of irregular beaches and along straight, uninterrupted beaches. The head is the widest part of the rip current. The neck is the point where feeder currents converge and move back out to sea through a weak spot in the breakers. In addition to the feeder, each current consists of a neck (main channel) and a head. Rip currents are fed by long shore currents, or feeders, which flow parallel to the beach inside the surf zone.
In other areas, one can appear suddenly or intensify after a storm or a breach in an offshore sandbar. In some regions, the rip current, or rip tide, is a permanent feature of the sea. Some cease just past the breaking surf others extend a thousand feet offshore. Rip currents can travel up to 3 mph (4.8 kph) and stretch 100 ft (30.5 m) wide. A rip current is a narrow, river-like channel of water moving away from the surf (breaking) zone and back toward sea.
0 kommentar(er)
