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• Definition• Universal Law of Gravitation

Sir Isaac Newton: December 25th, 1642 – March, 20th 1727

Physicist, mathematician, astronomer; often regarded as one of the most influential scientists of all time.

• Tidal Day / Forced Wave

• Definition

• Universal Law of Gravitation

• gravitational constant (G) = 6.673×10−11 N·(m/kg)2

• Tidal Day / Forced Wave• Types of Tides: Diurnal, Semidiurnal and Mixed-

Semidiurnal• Zero Tide• Spring Tides and Neap Tides• Flood Tides and Tidal Bores, Ebb Tides and Slack

Water• Progressive Tides and Rotary Tides, Amphidromic

Points• Tidal Bores• Reading a Tide Book (lab project)

Distance from the Earth to the Moon: at apogee = 405,500 kmat perigee = 363,300 kmmean = 384,400 kmdifference is 11%

Distance from the Earth to the Sun = 93,000,000 miles or 150,000,000 km also known as an Astronomical Unit (AU)

https://www.fourmilab.ch/earthview/pacalc.htmlapogee / perigee calendar

Distance from earth to sun varies by about 3.4 million Km/yr or 2.1 million miles/yr

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The Tidal DayThe Forced Wave

• Plot Tides in Lab. Read instructions carefully.

• Definition• Universal Law of Gravitation• Tidal Day / Forced Wave• Types of Tides: Diurnal, Semidiurnal and Mixed-

Semidiurnal• Zero Tide• Spring Tides and Neap Tides• Flood Tides and Tidal Bores, Ebb Tides and Slack

Water• Progressive Tides and Rotary Tides, Amphidromic

Points• Tidal Bores• Reading a Tide Book (lab project)

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Figure 10.1Types of Tides:

Diurnal

Semidiurnal

Semidiurnal

Mixed (Mixed)Or Mixed Semi Diurnal

Figure 10.2

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C

Tides……………………………………………………………………..

C

TIDES OUTLINE

• Definition• Universal Law of Gravitation• Tidal Day / Forced Wave• Types of Tides: Diurnal, Semidiurnal and Mixed-

Semidiurnal• Zero Tide• Spring Tides and Neap Tides• Flood Tides and Tidal Bores, Ebb Tides and Slack

Water• Progressive Tides and Rotary Tides, Amphidromic

Points• Tidal Bores• Reading a Tide Book (lab project)

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Fig. 11.8 TIDES OUTLINE

• Definition• Universal Law of Gravitation• Tidal Day / Forced Wave• Types of Tides: Diurnal, Semidiurnal and Mixed-

Semidiurnal• Zero Tide• Spring Tides and Neap Tides• Flood Tides and Tidal Bores, Ebb Tides and Slack

Water• Progressive Tides and Rotary Tides, Amphidromic

Points• Tidal Bores• Reading a Tide Book (lab project)

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Naruto Whirlpool in Japan, occurs in a narrow channel between Shiloku and Awaji Islands, several miles offshore!

Diameter ~ 20 meters, rate of spin ~ 20Km/hr

• Definition• Universal Law of Gravitation• Tidal Day / Forced Wave• Types of Tides: Diurnal, Semidiurnal and Mixed-

Semidiurnal• Zero Tide• Spring Tides and Neap Tides• Flood Tides and Tidal Bores, Ebb Tides and Slack

Water• Progressive Tides and Rotary Tides, Amphidromic

Points• Tidal Bores• Reading a Tide Book (lab project)

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The TOPEX/Poseidon Satellite can measure the sea surface elevation using Radar Altimetry. Ten measurements per second are taken as it tracks between

65 degrees north and south latitudes over 10 days. Tidal elevations have regular periods so they can be separated from other sea surface changes.

Figure 10.13

• Definition• Universal Law of Gravitation• Tidal Day / Forced Wave• Types of Tides: Diurnal, Semidiurnal and Mixed-

Semidiurnal• Zero Tide• Spring Tides and Neap Tides• Flood Tides and Tidal Bores, Ebb Tides and Slack

Water• Progressive Tides and Rotary Tides, Amphidromic

Points• Tidal Bores• Reading a Tide Book (lab project)

Tidal Bore on the Qiantang River, East China(aka: “Qiántáng Jiāng River”)

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Tidal bore in the Turnagain Arm of

Cook Inlet, Alaska

Surfing on the French River Dordogne (“doordo-ing”)

Brazilian surfer Savio Carneiro rides a tidal bore during a competition on Brazil's Mearim River. The event took place ~18 miles (30 kilometers) inland in the Amazon jungle, near

the northern Brazilian city of Arari.

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