'King tide' could cause flooding at Shore and area rivers over next few days

October 26, 2011|By Jacqueline L. Urgo, Inquirer Staff Writer
  • Marshes in front of Long Beach Island are expected to be completely under water during the next few days after the "king tide" arrives.

It is called the "king tide," and for the next few days in low-lying areas along the Jersey Shore, Delaware Bay, and as far north as Philadelphia and Trenton along the Schuylkill and Delaware Rivers, this twice-a-year phenomenon could cause flooding.

Not enough that anyone needs to build an ark.

Some experts contend, however, that these higher-than-usual tides - arriving in the region Wednesday and continuing through Friday - offer a preview of what everyday ocean, river, and stream levels could look like years from now.

"What's interesting about the king tides is how they serve as a window into our future. Today's king tides will be tomorrow's daily tides . . . probably in about 20 years," said Danielle Kreeger, science director for the Partnership for the Delaware Estuary.

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The Wilmington, Del.-based partnership, part of a national estuary program, is involved in projects and research to protect the estuary that is the tidal Delaware River and Bay and its tributaries.

Ocean tides result from the gravitational attraction of the sun, moon, and Earth. Also known as perigean high tides, king tides occur when the three are most closely aligned.

This alignment occurs twice a year, when the Earth reaches its closet point to the sun during its annual orbit, and the moon reaches its closest point to the Earth during its 27-day orbit. The combination of the two make for extreme water levels.

The "spring" king tide in the area occurred in January. It caused no appreciable damage, officials said.

Adding to the possibility of minor flooding during the king-tide period Wednesday through Friday will be gusty winds and rain expected Thursday, according to the National Weather Service in Mount Holly.

It will take only a "little push" from the wind to cause minor tidal flooding along the oceanfront, Delaware Bay, and the lower Delaware River and its tributaries, meteorologist Patrick O'Hara said.

Kreeger said many scientists concur that sea levels in the Delaware estuary and along the Eastern Seaboard could rise by three to five feet by the end of this century.

Kreeger and others say they want to make residents of flood-prone areas aware of what that could mean in the future.

At the Shore, in Barnegat Inlet off Long Beach Island, the high tide is expected to crest at about three feet Thursday morning - a foot higher than one week ago, said Karen Walzer, public outreach coordinator for the Barnegat Bay Partnership, a Toms River-based estuary-protection group.

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