# Hydrology - Water temperature in a river by ert554898

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```									  Hydrology :
Water temperature
in a river
Lucie Zimmlová

Anglo-Czech High School
České Budějovice - Czech Republic
Main ideas and aims of the
worksheet:
 To get familiar with water temperature
variability in a river
 To learn to search for data
   To learn to work with data
   To use GLOBE pages and other Internet
pages
Structure of the worksheet
 Background
 Learning activities
 Formulation of the hypothesis
• - basic part
• - more difficult part
• - conclusions
   Alternative task - a long-term project
Background
   Importance of water        Relation of water
quality for organisms       temperature and water
oxygen level
Learning activities
   1. Practical measurements
   2. Data search and making graphs

- temperature
- pH
- conductivity...
Hypothesis
“Does the water temperature usually increase
or fall with the distance from the source?”

Why?
temperature in a river      Part one (basic)

   Source of the data: Internet
pages of hydrometeorological
institute

   Using EXCEL

   Graph of water temperature
distribution from the river
source to the river outfall ...
   “How many graphs do verify your
hypothesis?”
   “How many graphs do reject your
hypothesis?”
   “How many graphs do neither verify

Part two (more difficult)
 Source of the data: GLOBE database
 Two schools doing measurements in the
same river
• !!!Are you sure???
• - find “Water body name”
• - write e-mail to schools
Work with the data
(basic)

   Graphs and tables of all water temperature
data

 - the lowest temperature measured
 - the highest temperature measured

 ...
Work with the data

   Find a day of every month during one year
that both schools measured water
temperature in

   Fill the table …
Fill the table
Higher temperature
Month   School 1 (nearer to   School 2 (nearer to
measured by school
the river source)     the river outfall)
number:
I
II
III
IV
V
VI
VII
VIII
IX
X
XI
XII

“Does the data verify your hypothesis?”

If not, try to tell why!
Conclusions
   “Does the water temperature usually
increase or fall with the distance from the
river?”
   “Why do the data appear that do not verify
the hypothesis, although you had found out,
that the hypothesis is right?”
   “Give a couple of suggestions of factors that
can influence this!”
project
 Make various measurements from the
source to the outfall of a river or a stream
 Observe animals and plants
 Draw maps, graphs, make tables...
 Make it public!

Only if you know the river, you are
able to protect it!!!
Teacher’s notes
 Subjects: biology, chemistry, geography
 Age: 12 to 18
 Time needed (in computer lab):

• - part one: 45 min
• - part two: 60 min
Prerequisity
   Being familiar with EXCEL (or similar)
Recommendation
   Teacher should give an advice to the
student which schools are appropriate for
   - making measurements
in the same river
   - having enough data
Some factors that can
influence temperature in a river
 Local weather (air temperature, rainfall…)
 Discharges e.g. from factories, power
stations
 Affluents
 River depth
 Dams
 Rapids...
Water temperature in Vltava river
2002
25,0

20,0
TEMPERATURE °C

15,0

10,0

Vltava - Vyšší Brod
5,0
Vltava - České Budějovice

0,0
2

02

02
02

2

2

2

2
2

2

2
02
I-0

-0

-0

-0

-0
-0

I-0

I-0
V-

X-
II-

II-
VI

XI
III

IV

IX
VI

XI
VI

MONTHS