What about Earth Tides?Recent studies have shown that not only are there tides in the oceans, but also in the earth and the air. Only recently, with very highly sensitive instruments, have scientists been able to see a tidal range of about twenty two inches. Compared to the ocean's tides, that amount is very small, but still a change is occurring every day. Also, this crustal tide is due to the same factor as the ocean tides, the sun and the moon. We
Tide Amplitudes Around the World
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http://mypages.iit.edu/~johnsonpo/smart00/lesson4.htm#tidalbores
Anchorage Alaska boasts the world's second highest tides: varying over 40 feet, low to high tide! Bore tide (one of the three highest in the world, and a weird phenomenon: capillary action on a gigantic scale!) occurs 2 hours 15 minutes after low tide; best viewed between Mileposts 101 and 90 Seward Highway (26 to 37 miles from Anchorage). For details see the
For 11 months of the year, the water levels of the two oceans on the ends of the Panama Canal differ because of tides and climatic conditions; only in February are they about the same. While the Pacific tides are very high (up to 7 meters) those in the Atlantic are quite low. For details see the
Historical tidal gauge at Anchorage Alaska.
http://mypages.iit.edu/~johnsonpo/smart00/lesson4.htm#tidefaqs
http://mypages.iit.edu/~johnsonpo/smart00/lesson4.htm#tidalbores
Anchorage Alaska boasts the world's second highest tides: varying over 40 feet, low to high tide! Bore tide (one of the three highest in the world, and a weird phenomenon: capillary action on a gigantic scale!) occurs 2 hours 15 minutes after low tide; best viewed between Mileposts 101 and 90 Seward Highway (26 to 37 miles from Anchorage). For details see the
For 11 months of the year, the water levels of the two oceans on the ends of the Panama Canal differ because of tides and climatic conditions; only in February are they about the same. While the Pacific tides are very high (up to 7 meters) those in the Atlantic are quite low. For details see the
Historical tidal gauge at Anchorage Alaska.
http://mypages.iit.edu/~johnsonpo/smart00/lesson4.htm#tidefaqs
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www.dec.state.ak.us/.../cookinletpor/index.htm
www.dec.state.ak.us/.../cookinletpor/index.htm
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Questions about Tides
http://tidesandcurrents.noaa.gov/faq2.html#26
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http://www.akhistorycourse.org/articles/article.php?artID=88
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http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=800192
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http://www.petroleumnews.com/pntruncate/202000564.shtml
October 15, 2006
Tidal power from Knik Arm could be viable
EPRI report looks at the feasibility and economics
of harnessing the tidal currents between Cairn Point and Port MacKenzie
Alan Bailey
Petroleum News
National Oceanic and Atmospheric Administration data for the Cairn Point site indicates a depth-averaged tidal current velocity of 1.1 meters per second, giving rise to a depth-javeraged power flux of 1.8 kilowatts per square meter. The EPRI report says that the total width of the Knik Arm at Cairn Point is 2,540 meters. The cross-sectional area of the deeper water within which the TISEC devices would be deployed is approximately 73,200 square meters.
Multiplying power flux and channel size data results in a total channel power of 116 megawatts.
But studies of tidal power implementation have established a rule of thumb that only about 15 percent of the total channel power can be converted to electricity without having a detrimental impact on the natural ecology of the site. That 15 percent factor results in an extractable power output of 17 megawatts for Knik Arm.
Could a tidal power plant of this size prove viable? The potential power output is quite modest when compared, for example, with the more than 350 megawatt power rating of the gas-fired Beluga power station on the west side of Cook Inlet.
From an economic perspective, the Knik Arm tidal power site has some factors in its favor. It lies next to an existing electrical infrastructure at Elmendorf Air Force Base and that, in turn, ties into the electrical grid in Anchorage. And the proximity of the Port of Anchorage would reduce construction costs.
However, the EPRI report says that the current 35-kilovolt line voltage available for the backhaul of power from the Elmendorf grid into the Anchorage grid is too low to support the maximum power output of a tidal power station in Knik Arm. So, the report says that an upgrade of
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Nikiski to Fire Island -- upper cook inlet 136,000 sq miles
1999- 15 pages TIDAL
http://www.thsoa.org/hy99/3_4.pdf
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Questions about Tides
http://tidesandcurrents.noaa.gov/faq2.html#26
-------------------------------------------------------------------------------------------
http://www.akhistorycourse.org/articles/article.php?artID=88
----------------------------------------------------------------------------------------------
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=800192
----------------------------------------------------------------------------------------------
http://www.petroleumnews.com/pntruncate/202000564.shtml
October 15, 2006
Tidal power from Knik Arm could be viable
EPRI report looks at the feasibility and economics
of harnessing the tidal currents between Cairn Point and Port MacKenzie
Alan Bailey
Petroleum News
National Oceanic and Atmospheric Administration data for the Cairn Point site indicates a depth-averaged tidal current velocity of 1.1 meters per second, giving rise to a depth-javeraged power flux of 1.8 kilowatts per square meter. The EPRI report says that the total width of the Knik Arm at Cairn Point is 2,540 meters. The cross-sectional area of the deeper water within which the TISEC devices would be deployed is approximately 73,200 square meters.
Multiplying power flux and channel size data results in a total channel power of 116 megawatts.
But studies of tidal power implementation have established a rule of thumb that only about 15 percent of the total channel power can be converted to electricity without having a detrimental impact on the natural ecology of the site. That 15 percent factor results in an extractable power output of 17 megawatts for Knik Arm.
Could a tidal power plant of this size prove viable? The potential power output is quite modest when compared, for example, with the more than 350 megawatt power rating of the gas-fired Beluga power station on the west side of Cook Inlet.
From an economic perspective, the Knik Arm tidal power site has some factors in its favor. It lies next to an existing electrical infrastructure at Elmendorf Air Force Base and that, in turn, ties into the electrical grid in Anchorage. And the proximity of the Port of Anchorage would reduce construction costs.
However, the EPRI report says that the current 35-kilovolt line voltage available for the backhaul of power from the Elmendorf grid into the Anchorage grid is too low to support the maximum power output of a tidal power station in Knik Arm. So, the report says that an upgrade of
--------------------------------------------------------------------------------------------
Nikiski to Fire Island -- upper cook inlet 136,000 sq miles
1999- 15 pages TIDAL
http://www.thsoa.org/hy99/3_4.pdf
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