Practical Investigation: Salinity
(Theory and background notes from semi-retired naycol site here)
Introduction:
We previously discovered that when the tide comes into our stream the water on the top was (more or less) fresh, while the water on the bottom was very salty.
This investigation will:
We previously discovered that when the tide comes into our stream the water on the top was (more or less) fresh, while the water on the bottom was very salty.
This investigation will:
- see how far the salt wedge extends as the tide comes into the stream
- explain why we get a salt wedge
- and relate this to 'issues' the fish we sometimes see swimming up the stream might have.
2016 raw data
2 weeks later 2nd class sampled, they found:
15m top = 5g/L, 15m bottom = 23.1 g/L, 90m bottom 22.2 g/L
(this trip the tide was up into the tunnel)
2015 RAW DATA
dThere are problems living in an area where the salinity changes.... like a tidal stream
A red onion cell in salt water... remember doing this?
What has happened to it?
also... our potato fish experiment
What happened to them?
A red onion cell in salt water... remember doing this?
What has happened to it?
also... our potato fish experiment
What happened to them?
Some introductory research to do...
Find an image of someone floating in the Dead Sea, explain the buoyancy, ie why do they float so well?
Find an image of a ships plimsoll line, state what the letters (ie the T, F S etc ) stand for, and explain the buoyancy of the ship in different places. What is the history of the Plimsoll line.
Find an image of salinity differences causing currents in the ocean and explain it
(also view : http://www.youtube.com/watch?v=qeZgJzt3m04 )
Find an image of a salt wedge and explain it also this is a wee bit cool: http://www.youtube.com/watch?v=wL6ecTtm688&feature=related
This sort of stuff may very well have a place in your discussion where you link your results to the science ideas
Data task Excel ....
Use the data below to make a calibration curve, ie practice your skills, you will need them to process your own data
When you have finished it should look something like this.....
go have a look first so you know what to aim for
Find an image of someone floating in the Dead Sea, explain the buoyancy, ie why do they float so well?
Find an image of a ships plimsoll line, state what the letters (ie the T, F S etc ) stand for, and explain the buoyancy of the ship in different places. What is the history of the Plimsoll line.
Find an image of salinity differences causing currents in the ocean and explain it
(also view : http://www.youtube.com/watch?v=qeZgJzt3m04 )
Find an image of a salt wedge and explain it also this is a wee bit cool: http://www.youtube.com/watch?v=wL6ecTtm688&feature=related
This sort of stuff may very well have a place in your discussion where you link your results to the science ideas
Data task Excel ....
Use the data below to make a calibration curve, ie practice your skills, you will need them to process your own data
When you have finished it should look something like this.....
go have a look first so you know what to aim for
Calibration graph here as well
Assessment task
Pics from 2016
Pics from 2015
Pics from the class of 2014