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[地理] Questions about River and Coast

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Questions about River and Coast

1. Why infiltration increases with vegetation cover?
2. How does trellis drainage pattern differ from the retangular one?
3. Why the degree of destruction of a tsunami in shallow bay is higher than that in a deep bay?

And who has the questions of this year's DSE Geography exam paper? Beg for sharing!! [img]http://lsforum.net/board/images/smilies/default/.gif[/img]

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引用:
原帖由 derrickplkcfs 於 2014-5-6 03:37 PM 發表
1. Why infiltration increases with vegetation cover?
2. How does trellis drainage pattern differ from the retangular one?
3. Why the degree of destruction of a tsunami in shallow bay is higher than  ...
1) 植被上升--> 截留增加 (滯水作用) --> 雨水到達地表既時間增加 + 較少既雨水降到地表 --> 有利雨水下滲至土壤中
     另外, 植被的根系有利改善土壤的空隙度, 有利下滲, 增加下滲量

3)巨浪在深海並不明顯;但當去到海岸時,會突然被提升,海浪愈高,沖流愈強, 破壞力/撞擊力愈大 + 愈能深入內陸, 造成嚴重及廣泛性既地區破壞

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1. more vegetation cover = more interception= more w'' trapped by plant= less overland flow
                                                                                                                   = more time for w'' to infiltrate
   .'. infiltration increase

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2) there's ridge formed by alternate layer of  resistance rock and non-resistance rock and rivers flows // to ridges in trellis drainage basin.
   In rectangular one, rocks are of uniform resistance

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3) less w'' in shallow bay to absorb the wave energy of tsunami-> higher energy-> greater destruction

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