Pengenalan Alat Rambu Ukur, Secchi Disk, dan Bola Duga

Summary

This video provides educational insights into the use of various maritime measuring tools. The first segment covers the use of a wave height gauge to measure wave height and tidal levels, emphasizing the importance of calibration and precise observation. The second segment introduces the use of a drift ball to measure ocean current speed, explaining the setup and how to interpret the results. The final part demonstrates the use of a secchi disc to measure water clarity, detailing how to collect data for accurate results. The tutorial aims to educate viewers on these essential tools for oceanographic study.

Takeaways

• 😀 The first speaker, Nando Wirayuda, explains how to use a measuring pole ('rambu ukur') for wave height and tidal measurements.
• 😀 The measuring pole can measure heights of 1, 2, 3, 4, and 35 meters.
• 😀 Three key checks should be made before using the measuring pole: checking the instrument's readings, ensuring the base is level, and confirming the locking mechanism is secure.
• 😀 To use the measuring pole, adjust its height as needed, place it in the center of the measurement area, and avoid tilting it.
• 😀 Observe the incoming waves for a specific duration and record the highest peak and the lowest trough during that time.
• 😀 To calculate the wave height, subtract the lowest trough from the highest peak recorded during the observation.
• 😀 The second speaker, Kristen Willy Silitonga, introduces the use of a simple tool called 'bola duga' (a flow meter) to measure sea currents.
• 😀 The bola duga tool is used by attaching it to a rope and ensuring the rope is securely tied to avoid the tool being swept away by the current.
• 😀 After placing the bola duga in the water, observe how long it takes for the rope to be pulled straight, which indicates the speed of the current.
• 😀 In the given observation, it took 14 seconds for the rope to straighten, with the current heading south at a speed of 22 units.
• 😀 The third speaker explains the use of an instrument for measuring water clarity, which includes a disc with black and white colors.
• 😀 Before using the clarity tool, ensure that the rope holding the instrument is strong enough to prevent it from detaching.
• 😀 The measurement process involves submerging the clarity tool in water, first until the white disc is no longer visible, then recording this depth as the first data point.
• 😀 A second measurement is taken when the white disc becomes invisible again, and the average of the two depths is used to determine the water's clarity.

Q & A

What is the purpose of the measuring tool discussed by Nando?

The measuring tool, called 'rambu ukur,' is used to measure wave height and tidal fluctuations in the sea.

What are the three conditions to check before using the measuring tool?

The three conditions are: 1) Check the readings on the tool and ensure they are clear and free of dust. 2) Check the condition of the tool's base to ensure it is flat and stable. 3) Verify that the tool is securely locked in place.

How do you use the measuring tool effectively?

To use the tool, first set the height by adjusting and locking it according to your needs, then place it in the middle of the area where you want to measure. Ensure the tool is not tilted as it can affect the reading. Observe the waves and record the highest peak and lowest trough during the observation period.

What is the procedure to calculate wave height?

To calculate wave height, subtract the lowest trough reading from the highest peak reading observed during the measurement.

What is the purpose of the 'bola duga' mentioned by Kristen?

'Bola duga' is a tool used to measure the surface current of the sea by observing how a rope is pulled straight by the current and timing how long it takes.

What is the first step in using the 'bola duga' tool?

The first step is to securely tie a rope to the 'bola duga' to ensure that it doesn't come loose or get carried away by the current during the experiment.

How do you observe the sea current with the 'bola duga'?

Place the 'bola duga' in the water and observe how the rope is pulled straight by the current. The time it takes for the rope to be fully extended is used to measure the strength of the current.

What data was recorded during the experiment with 'bola duga'?

During the experiment, the time it took for the rope to become fully extended was 14 seconds, and the direction of the current was recorded as 22 degrees south.

What does the tool to measure water clarity do?

The tool to measure water clarity, equipped with a black-and-white disk, is used to determine the depth at which the disk is no longer visible in the water, which indicates the water's clarity.

How is water clarity measured with the disk tool?

To measure water clarity, the disk is submerged in the water until the white part is no longer visible. Two readings are taken: one when the white part disappears and another when it reappears. The average of these two measurements gives the water clarity.