# DEPTH, TEMPERATURE AND PHOTIC ZONE

## Marina Florencio, Alicia Aguado, Tarek Rashed

Last Thursday 2º of May we measured this parameters since Seville to San Lucar De Barrameda , we took samples from different stops along the river.

## PHOTIC ZONE

Is the depth of the water in a lake or ocean that is exposed to sufficient sunlight for photosyntesis to occur.

-you have to introduce the "Disco de Secchi" on the water
-When you can´t see it you take the "Disco de Secchi" and see the depth
-You have to multiply the depth by two
-You have to repeat it twice and calculate the mean

UNIT-------------- VALUE
<0,50.................... 0
0,50-1................... 4
>1......................... 8

## TEMPERATURE

Is a physical quantity that is a measure of hotness and coldness on a numerical scale.

You have to introduce the bottle with the termometre on the water in a depth of 5 metres , and you have to wait two or three minutes
After three minutes you have to see the temperature
You have to repeat it three times and do the mean

T*= Temperature of the water T= Temperature of the enviroment

UNIT---------- VALUE
T*= T-2............ 0
T*= T-1 ............4
T*= T ...............8
T*= T+1 ...........4
T*= T­­+2........... 0

## DEPTH

Is the space between the surface of the water and the floor

To measure it you need a weighted rope
You have to repeat it three times and calculate the mean
The rope must be vertical.

UNIT------ VALUE
< 3................ 0
3-4 ...............2
4-5............... 4
>5................ 6

## CONCLUSIONS

The temperature decrease along the river
The depth increase along the river
The photic zone decrease along the river

## RESOURCES

- Wikipedia
-Class sheet
-measures of the trip