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[Geog] channelization姐係點解?

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channelization姐係點解?

channelization係咩?
會對條河造成咩影響?
大多數係咪係中下游發生?
   

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令條河直d, 流速快d 所以flooding冇咁易發生

同埋會整下個river bank架,整到佢唔會erosion發生

多數係下游因為flooding主要係下游發生

其實成個目的係防止flooding.

[有錯請更正]

[ 本帖最後由 土竹用戶名 於 2010-4-14 02:07 AM 編輯 ]

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姐係straightening of river channel?!

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引用:
原帖由 111222333 於 2010-4-14 10:34 AM 發表
姐係straightening of river channel?!
Generally, channelization refers to some artifical (man-made) changes to a river channel.It has three approaches:

1. Straightening the river channel ( you are right ~!)
2. Widening the river channel
3. Deepening the river channel

For the first approach,the aim is to prevent flooding by increasing velocity of the river ... and you can imagine, more sediments are washed away by the effects of transportation, so I think the erosion on the river bed should be greater .... and for the other two, the aim is the prevent flooding by increasing the bankfull discharge of the river ....

So, let me make some more points about "map-evidence":
1. the presence of dypes built along the river channel
2. the straight pattern of the river channel
3. the absence / smaller angles of meanders


Additional information:
most channelization is undertaken to reduce flood hazards. However, channelization is also unfertaken to allow development on the floodplain.



KELY TO, a F.6 student who are quite interested in geography.

P.S. Should you have any enquiries or comments, or suggestions, please feel free to contact me.
MSN: kely_to@hotmail.com




[ 本帖最後由 kely_to 於 2010-4-14 10:55 PM 編輯 ]
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