hydrology : water temperature in a river lucie zimmlová anglo-czech high school České budějovice...
TRANSCRIPT
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Hydrology :Hydrology : Water temperature Water temperature
in a riverin a riverLucie Zimmlová
Anglo-Czech High School
České Budějovice - Czech Republic
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Main ideas and aims of the Main ideas and aims of the worksheet:worksheet:
To get familiar with water temperature variability in a river
To learn to search for data To learn to work with dataTo use GLOBE pages and other Internet
pages
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Structure of the worksheetStructure of the worksheetBackgroundLearning activitiesFormulation of the hypothesisMain task
• - basic part• - more difficult part• - conclusions
Alternative task - a long-term project
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BackgroundBackground
Importance of water quality for organisms
Relation of water temperature and water oxygen level
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Learning activitiesLearning activities
1. Practical measurements
2. Data search and making graphs
- temperature
- pH
- conductivity...
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HypothesisHypothesis
“Does the water temperature usually increase or fall with the distance from the source?”
Why?
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Main taskMain taskPart one (basic)Part one (basic)
Actual water temperature in a river
Graph of water temperature distribution from the river source to the river outfall ...
Source of the data: Internet pages of hydrometeorological institute
Using EXCEL
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……reading the graphsreading the graphs
“How many graphs do verify your hypothesis?”
“How many graphs do reject your hypothesis?”
“How many graphs do neither verify nor reject your hypothesis?”
“Now, is your hypothesis correct?”
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Main taskMain taskPart two (more difficult)Part two (more difficult)
Source of the data: GLOBE databaseTwo schools doing measurements in the
same river
• !!!Are you sure???
• - find “Water body name”
• - write e-mail to schools
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Work with the dataWork with the data(basic)(basic)
Graphs and tables of all water temperature data
- the lowest temperature measured- the highest temperature measured...
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Work with the dataWork with the data(advanced)(advanced)
Find a day of every month during one year that both schools measured water temperature in
Fill the table …
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Fill the tableFill the table
Month School 1 (nearer tothe river source)
School 2 (nearer tothe river outfall)
Higher temperaturemeasured by school
number:
I
II
III
IV
V
VI
VII
VIII
IX
X
XI
XII
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Answer the question:Answer the question:
“Does the data verify your hypothesis?”
If not, try to tell why!
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ConclusionsConclusions(main task)(main task)
“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!”
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Alternative task - a long-term Alternative task - a long-term projectproject
Make various measurements from the source to the outfall of a river or a stream
Observe animals and plantsDraw maps, graphs, make tables...Make it public!
Only if you know the river, you are able to protect it!!!
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Teacher’s notesTeacher’s notes
Subjects: biology, chemistry, geographyAge: 12 to 18Time needed (in computer lab):
• - part one: 45 min
• - part two: 60 min
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PrerequisityPrerequisity
Being familiar with EXCEL (or similar)
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RecommendationRecommendation
Teacher should give an advice to the student which schools are appropriate for the task two:
- making measurements in the same river
- having enough data
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Some factors that can Some factors that can influence temperature in a riverinfluence temperature in a river
Local weather (air temperature, rainfall…)Discharges e.g. from factories, power stations AffluentsRiver depthDamsRapids...
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Water temperature in Vltava river Water temperature in Vltava river 20022002
0,0
5,0
10,0
15,0
20,0
25,0
I-02
II-02
III-02
IV-0
2V-0
2VI-0
2
VII-02
VIII-02
IX-0
2X-0
2XI-0
2
XII-02
MONTHS
TE
MP
ER
AT
UR
E °
C
Vltava - Vyšší Brod
Vltava - České Budějovice
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Thank you for your attention!Thank you for your attention!
Do you have any questions?