Cette leçon contient 32 diapositives, avec diapositives de texte et 3 vidéos.
La durée de la leçon est: 45 min
Éléments de cette leçon
3.3 Sometimes too much
Part 1
Slide 1 - Diapositive
Learning outcomes 3.3
- You know which areas have greater flood risks.
- You understand why floods have major consequences for the inhabitants of those areas.
- You can name a number of measures that reduce flood risks.
Slide 2 - Diapositive
Slide 3 - Vidéo
Slide 4 - Diapositive
Flood risk areas
Slide 5 - Diapositive
Areas that are at high risk of flooding
Slide 6 - Diapositive
1. River and coastal plains.
Slide 7 - Diapositive
2. Areas at the foot of a mountain range with rocky surface (peak discharge).
Slide 8 - Diapositive
Peak charge
Piekafvoer
If the water level rises sharply in a short period of time, this is called a peak discharge.
Slide 9 - Diapositive
Peak discharge
Slide 10 - Diapositive
Flooding
In the Yangtze, rain and melt water in spring and summer cause a high peak discharge (=Extremely high water discharge in a river). People make the problem worse through deforestation (=Cutting down forests).
Better absorption of water by vegetation = lower peak discharge.
Less vegetation = higher peak discharge
Slide 11 - Diapositive
3. Areas where snowmelt coincides with heavy rainfall in summer.
Slide 12 - Diapositive
4. Areas where hurricanes occur.
Slide 13 - Diapositive
5. Areas where deforestation is taking place upstream.
Slide 14 - Diapositive
6. Areas which have a lot of urban development. (petrification, urbanization)
Slide 15 - Diapositive
7. Areas with soil subsidence due to the pumping of groundwater.
Find a specific place where this takes place in each of the 7 areas.
Slide 21 - Diapositive
3.3 Sometimes too much
Part 2
Make groups existing of 3-4 students
Slide 22 - Diapositive
The number of floods is increasing
Slide 23 - Diapositive
Slide 24 - Diapositive
How is it possible that the number of floods is increasing?
Slide 25 - Diapositive
Warming of the atmosphere -> warming of the oceans -> warm sea water -> more water vapor (especially in warm air) -> more heavy storms and heavy precipitation
River deltas: extreme storms with heavy precipitation, sea level rise due to expanding seawater, melting polar caps, glaciers and subsidence due to drinking water extraction
Slide 26 - Diapositive
Consequences and measures
Slide 27 - Diapositive
What could be the consequences of a flood?
Slide 28 - Diapositive
Slide 29 - Diapositive
What can be a measure in the short term and in the long term?
Slide 30 - Diapositive
Short term
- Construction of dikes, dams and buffer basins.
- Monitor the weather throughout the watershed.
- Inform and train citizens (evacuation exercises).
- Securing drinking water and food after possible flooding.
Slide 31 - Diapositive
Long term
- Make room for the river (provide flood plains).
- Reduce the enhanced greenhouse effect.
- Create a location policy in which people are excluded or moved from risk areas as much as possible.
La durée de la leçon est: 45 min
