FieldTrip Lab Worksheet Complete

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Long Beach City College *

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160L

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Geography

Date

Dec 6, 2023

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docx

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Uploaded by CoachMusic12933

ERTH 160L Name: Lorelai Burke Virtual Field Trip—Alamitos Bay Purpose: This lab will introduce you to the sand source for Long Beach and Huntington Beach beaches and the processes that move the sand around. We will then take a virtual tour via GoogleEarth to explore the differences between beaches along Alamitos Bay and beaches toward the open water. Along the way, we will introduce ocean salinity. Salinity will be explored more in the future. Part I. Material and movement along the beach. 1a. What do you think might happen if the river stops bringing new sand to the beach? Beaches and coastlines will narrow and even disappear. 1b. In the slide with two white arrows, which direction is longshore drift A / B (Circle one) 1c. How do you know? (Explain) Because the sand is being plucked and deposited, you can tell by the amount of sand of either side of the wall, and how there is more sand on the left side because the sand is being pushed towards the wall. Part 2: Salinity Salinity of water is a measure of how much dissolved salts there are. In the oceans, salinity is measured in parts per thousand (ppt or ‰). PPT means that for every 1 salt molecule there are 999 water molecules (i.e., one in a thousand). Parts per hundred (or percent or %) Looking at the salinity map, answer the following questions. 2a. Where is salinity highest? The Atlantic Ocean, the Mediterranean Sea – mid-latitudes 2b. Where is it lowest? Near the Poles – glacier run off is salt free. 3. If a body of water has a salinity of 37 ppt, what is the percentage of salt? (Show calculation) 37/10 = 3.7 % What are some processes that could increase salinity? Decrease salinity? Increase – evaporation! Decrease – precipitation/glacier runoff!

Are there places other than those on the map where you would expect salinity to be higher? Lower? Not other than the places it states on the map. Part 3. Virtual Fieldtrip Click the link https://earth.google.com/earth/rpc/cc/drive?state=%7B%22ids%22%3A%5B %221XjbVEDc9zMGi7eNCGjyKdTiMG5GQZ8dJ%22%5D%2C%22action%22%3A%22open%22%2C %22userId%22%3A%22110127186209009525891%22%7D&usp=sharing 3. The first stop is at Alamitos Bay on the side of the peninsula. a. What is the salinity of the water? 37 ppt, or 3.7% b. Is this higher or lower than the average? Higher than average  How would you describe the wave energy and size? Waves are small and have no energy or merely do not exist.  What do you think is the relationship between wave energy, sand grain-size and shell types and size? Smaller waves mean less energy, which means smaller sediments are carried, meaning most seashells and sand grains are relatively small on the bay side. c. Given the salinity value, what processes and conditions are there in the bay? I would suspect a good amount of evaporation happens at the bay, leaving more salt in there

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