Letters

Letters 09-15-2014

Stop The Games On Campus

Four head coaches – two at U of M and two at MSU – get a total of $13 million of your taxpayer dollars each year. Their staffs get another $11 million...

The Truth About Fatbikes

While we appreciate the fatbike trail coverage, the quote from the article below is exactly what we demonstrated not to be true in most cases last season...

Man Has Environmental Responsibility

I tend to agree with Thomas Kachadurian (“Playing God,” Sept. 8) that we should not interfere with the power of nature by deciding what is “native” and what is not. Man usually does what is better for man (or so we believe), hence the survival and population growth of our species...

The Bush & Obama Facts

Don Turner’s letter to the editor on 8/25/14 stated that there has never been a more corrupt, dishonest, etc. set of politicians in the White House. He states no facts, but here are a few...

Ban Pesticides

I grew up downstate in a neighborhood without pesticides. I was always very healthy. Living here, I have become ill. So I did my research and found out a lot about these poison agents called pesticides (herbicides, fungicides, insecticides, chemical fertilizers, etc) that are being spread throughout this community, accumulating in our air, water and soil...

Respect for Presidents?

Recently we read the Letter to the Editor that encouraged us to stop characterizing President Obama as anything other than an upstanding, moral, inspiring “first Black President”. The author would have us think that the rancor in the press, media and public is misguided. And, believe it or not, this rancor is a “glaring exception to … unwritten patriotic rule” of historically supporting all previous presidents...


Home · Articles · News · Features · Strange Oscillations:...
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Strange Oscillations: Mysterious ‘seiche‘ Drops Bay Water Level by 18 Inches in Two Hours

Sandy Bradshaw - June 27th, 2002
On Tuesday morning, June 4th, 2002, West Grand Traverse Bay‘s water level dropped an astonishing 18 inches in less than two hours. A sailor was getting his boat ready for summer mooring and by the time he was all set to go - too late! His boat was stuck in a sandbar due to the sudden water level drop.
Known as a seiche, it is a phenomenon which occurs frequently on the bays of Northern Michigan. What is a seiche? Pronounced “saysh,“ you may compare it to water sloshing in a bathtub. Seiches are tide-like rises and drops in coastal water levels, (occurring both in fresh water and ocean waters) caused by prolonged strong winds that push water toward one side of the water body. This causes the water level to rise on the downwind side of the lake and to drop on the upwind side. As the wind diminishes, the water sloshes back and forth, with the near-shore water level rising and falling in decreasingly small amounts on both sides of the lake until it reaches equilibrium.
Seiches occur most in waters that are more or less surrounded by land, such as lakes, fjords and gulfs. Otherwise there would not be that sloshing back and forth that characterizes a seiche. Water blown onto a shore will just ebb back into the ocean if there is no opposite shore to reflect the wave. Seiches can also be caused by earthquakes, even very distant ones. Seiches triggered by earthquakes thousands of miles away have been reported.
“Seiches occur all the time on the bay,“ said John McKinney, past Maritime Heritage Alliance board member and Michigan Sea Grant agent. “This one was a bit larger than usual for Grand Traverse Bay though. Atmospheric pressure and wind changes helped contribute to the quick rise and fall of the bay. The western end of Lake Erie experiences large ones quite often - sometimes as high as six feet,“ he noted.
“Historically no one has taken records of the seiche effect,“ McKinney continued. “They are usually so small no one even notices them. A few years back we had a Japanese researcher, Dr. Uehara, take records on the bay with a special monitoring instrument every ten minutes. He conducted those measurements for six month stretches over a period of several years. This was documented on a graph, and shows seiche occurs constantly.“
According to Hans Joerg Rothenberger, a Swiss science and history buff
and skipper of a gaff cutter in Greece where seiches are
frequent, the word was first used in a scientific context by his
compatriot François-Alphonse Forel (1841 - 1912). “He was a professor of
anatomy and physiology, but known in international science rather as the
‘father of ‘imnology,‘ i.e. the science of lakes,“ said Rothenberger.
“Forel used the French word ‘seiche‘ for the first time in 1869 after
watching the phenomenon on Lake Geneva, a lake roughly the size of the
Grand Traverse Bay. He reported a seiche of eight days with about 200
oscillations. By the way, the question of the original meaning of the
word ‘seiche‘ gave rise to various theories, none of which is very
convincing.“
 
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