# Geographic Information Question

PLEASE FIND THE ATTACHED DOCUMENT BELOW AND ANSWER THE QUESTIONS:

Requirements: ANSWER

Wind Speed (mph)https://www.surfline.com/surf-charts/@0,180,1z?type=wind SOH

Wave Height (ft)SOHhttps://www.surfline.com/surf-charts/@0,180,1z?type=wave-height

GEOS 212: Intro to Oceanography NAME ___________________________

Homework #5 (Fall 2023)

Due 12 noon, Friday, Oct. 13, 2023 Email: ___________________@email.arizona.edu

Waves & Winds

This homework should be uploaded to the Homework #5 folder in the Dropbox on D2L. You can either annotate the Word or PDF version, or you can print the homework out, do it by hand, and then upload a picture of each page.

This assignment is due on 10/13 by 12 noon – NO LATE ASSIGNEMNTS ARE ACCEPTED

Please make sure you do your own work on this exercise. It is fine to work with others, but the information you write down must be in your own words and in your own format.

Identical papers (content & format) will receive zero credit.

This homework deals with winds and waves.

To do this exercise, all you will need are the attached maps of:

wind speed wave height

Winds & Waves

Surfing or Sailing?

You find yourself with some time off, so you decide to go surfing.

Let’s look at the wind and the waves on beaches in the US and

around the world to find the ideal conditions!

The first thing you need to do is draw a graph that shows the expected relationship between wind speed and wave height. Plot the values in the table on the right on the graph below and draw a smooth curve that shows this relationship.

This is the Fully Developed Sea (FDS) curve.

1.

2. What the definition of a Fully Developed Sea? ___________________________________________

___________________________________________________________________________________

___________________________________________________________________________________

3. Please determine conditions for beaches at the locations below using the accompanying maps of wave height and wind speed.

Colors on the maps are occasionally difficult to discern – a few feet or mph(kts) difference doesn’t matter. Just plot them on the FDS chart correctly!

Baja California (south tip):

wind speed ________ (mph/kts) wave height _______(feet)

Please plot the values of wave height and wind speed on the graph above and label the point B.

Cape Cod, Massachusetts:

wind speed ________ (mph/kts) wave height _______(feet)

Please plot the values of wave height and wind speed on the graph above and label the point C.

Cape of Good Hope (southern tip of Africa)):

wind speed ________ (mph/kts) wave height _______(feet)

Please plot the values of wave height and wind speed on the graph above and label the point G.

Maui (North Shore) Hawaii:

wind speed ________ (mph/kts) wave height _______(feet)

Please plot the values of wave height and wind speed on the graph above and label the point H.

West Coast of Ireland

wind speed ________ (mph/kts) wave height _______(feet)

Please plot the values of wave height and wind speed on the graph above and label the point I.

Southwest Corner of Australia (southeast of Perth):

wind speed ________ (mph/kts) wave height _______(feet)

Please plot the values of wave height and wind speed on the graph above and label the point P.

Southern Ocean (Biggest Waves right now)

wind speed ________ (mph/kts) wave height _______(feet)

Please plot the values of wave height and wind speed on the graph above and label the point SO.

Tierra del Fuego (southern tip of South America):

wind speed ________ (mph/kts) wave height _______(feet)

Please plot the values of wave height and wind speed on the graph above and label the point T.

Wavy Island (an imaginary place….)

wind speed ____5___ (mph/kts) wave height ____25___(feet)

Please plot the values of wave height and wind speed on the graph above and label the point W.

Windy Island (an imaginary place….)

wind speed ____45___ (mph/kts) wave height ____5___(feet)

Please plot the values of wave height and wind speed on the graph above and label the point Z.

4a. Which of these areas would be good for surfing (big waves, low wind)? ____________________

What can you say about the formation of waves above the FDS curve, that is:

how can you have big waves in a place with a small wind?

________________________________________________________________________________

________________________________________________________________________________

4b. Which of these areas would be good for sailing (low waves, big wind)? ____________________

What can you say about the formation of waves below the FDS curve, that is:

how can you have small waves in a place with a big wind?

________________________________________________________________________________

________________________________________________________________________________

5. Cost-wise, surfing at La Jolla in San Diego is probably the best option! But when would waves from tropical storm Lidia south of Baja arrive in San Diego? Here’s how to figure this out:

a) Tropical Storm Lidia (soon to be Hurricane Lidia) is about 2000 kilometers (1300 miles) away from San Diego.

b) Assume that wind speed in the storm grows to 130 km/hour (about 70 kts, 80 mph) and the sea becomes “Fully-Developed”. The individual waves created in that storm travel at:

wave speed = 0.57 x wind speed

Wave speed = ____________ km/hr

c) But also remember that waves travel across the ocean in sets, and that a set of waves travels at only half the speed of the individual waves, so

set velocity = 0.5 x wave speed

Set velocity = ____________ km/hr

d) Calculate the time (in hours) as follows:

Time (in hours) = Distance (in km) / Set Velocity (in km/hr): Time = ___________hrs

e) So about how many days will it take for the waves from Lidia to travel to San Diego?

Days = __________days