RIVERS!
Hello guys!I am really sorry for putting up this post late-.-||. Anyway, thank God, Guzheng SYF is finished!Hooray!XD
OK,let's do some revision. Do you still remember what we learnt on 17th of April?
1. River---Man and civilisation
River is so essential for human development. And learning about the essential living conditions for humans is also important for us. We find out that great civilizations have always flourished alongside rivers. For example, the Yellow River Valley, is always thought to be the cradle of The Chinese civilization. And the Nile River valley in Egypt was the site of the world's first great civilization. Our pretty teacher Ms. Tang also showed us a picture of Nile Delta (which is screenshoted from her favourate Google Earth), and we saw that there is a very high population density along the river but few people live elsewhere in that region.
The explanation is as simple as this:
River-->water necessary for farming & drinking--> better living conditions--> more people live and multiply along rivers.
2. Model-making Time
The second half of the lesson was used for model making activities. We were supposed to make models of deltas, waterfalls, floodplain and levees, meanders,rapids and ox-box lake with plasticine and put them in order according to how a river flows. I feel that this kind of hands on acitivities really helps in understanding. I can have a clear picture of how different parts of a river look like and why they are located at where they are.
Yeah this is the whole model done by Loulou,Jenny,Binghui and YIXUAN!
Before making a model like ours, you must understands what the different parts of the river are.:)By the way, Ms Tang showed us the photos of the waterfalls she took in U.S.,and those photos are cool!:)
OK, lastly, let me ask you a question that we have already discussed in class:
Is the speed of the water in the upper cause always the fastest?Why?
Done by:
posted by 08IP04/JH404 @ 4:46 AM
7 Comments:
Hi, Yixuan:) Nice pictures!
For the last question, my answer is NO. The speed of the water in the upper cause is not the fastest.
Ms Tang taught class about this, but i cannot remember clearly what she said..
She said something like: may not be fastest at the upper course, the energy is used to overcome the friction instead of moving energy?
er... I'm not very sure about it.
binghui :)
oooops.... My answer is: may not be the fastest. Type wrongly, sorry about my mistake:(
You said "great civilizations have always flourished alongside rivers". It applies to the old ancient world.However, it does not necessarily works to nowadays' world. A typical example will be Singapore.Obviously Singapore only has one river and it's not big.However it's a thriving country.
Tung
For your question of why the speed of water at the upper course is not the fastest :
We know that Total energy = Kinetic E + Potential E
- The total energy of the water is unchanged
- The water at the upper course is at high position => high potential E
=> The kinetic E of the water is lower at the upper course
=> not greatest speed
That's what I think
Tung
I think that it depends. Although the speed of water at upper course is generally faster as compared to middle and lower courses, different area of the upper course may have different current speed (depends on factors such as gradient, interception...)
That's my opinion!
Jenny
I think that it depends. Although the speed of water at upper course is generally faster as compared to middle and lower courses, different area of the upper course may have different current speed (depends on factors such as gradient, interception...)
That's my opinion!
Jenny
I totally agree with you that river management is extremely essential for people's lives. we all know that many rivers now have the problem of flooding. Flooding does have very bad influence to surrounding people, they lose their houses, their lives. To avoid or reduce this, river management must be applied.
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