. Coast watch. Marine resources; Oceanography; Coastal zone management; Coastal ecology. The period of the wave or the time between two crests passing the same point was longer than usual — 21 seconds, as opposed to the eight seconds typical of a local storm and the 10 to 15 seconds for the average northeaster. This indicated that the length of the waves was longer. Wave length is indicative of how deep the wave action penetrates the water column, says Sea Grant marine education specialist Lundie Spence. A wave causes water to move in an orbital fashion to a depth of one half the wave length.
. Coast watch. Marine resources; Oceanography; Coastal zone management; Coastal ecology. The period of the wave or the time between two crests passing the same point was longer than usual — 21 seconds, as opposed to the eight seconds typical of a local storm and the 10 to 15 seconds for the average northeaster. This indicated that the length of the waves was longer. Wave length is indicative of how deep the wave action penetrates the water column, says Sea Grant marine education specialist Lundie Spence. A wave causes water to move in an orbital fashion to a depth of one half the wave length. Thus a longer wave affects the bottom sediment sooner and over more distance. This mobilizes more nearshore sediment and locations," says Rogers. "There's actually more storm protection in place than is obvious to the ; When a second storm hit a few weeks after the Halloween northeaster, the waves hit a more fonnidable dune line in many areas. Moving the sand from the beach to the dune line steepens the angle of the beach. The flat summer beach is now sloped. If you get to the coast, says Spence, look for the difference. In some cases, waves breached dunes, transporting sand to the roads behind. This is the overwash process in action. The second storm had less energy of Updates and Events than the first, but with high tides, it had no trouble moving through the breached dunes. The Halloween northeaster caused damage to more than 500 homes and businesses. A Double Standard For Treated Wood If you're planning to buy treated lumber to build a bulkhead or dock in salt water, remember that looks can be deceiving. The familiar green color of wood treated with chromated copper arsenate doesn't mean your structure will be safe from shipworms. Saltwater structures won't repel pesky marine borers unless the lumber they're made of has been treated with the proper chemical strength — usually 2 1/2 pounds of CCA per cubic foot, says Sea Grant coastal engineer Spenc
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