Transcription of 第三章河流地貌 - oause.pku.edu.cn
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第三章河流地貌 - oause.pku.edu.cn
3-1 .. 3-2 .. (erosion) (transportation) . (deposition) . Ek=m v2/2. (Ek m- v- . V=C (Rs) Ch zy equation). (v- R- s- C- .. Ek= mC2Rs)/2. V=R2/3s1/2/n (Manning equation, n- . R=A/P( . 1 .. helical flow pattern .. 256 . 251 . 3-4 . 1 3-4 a .. 2 3-4 (b) .. 3 3-4 (c) .. 4 3-4(d) .. 3-4 .. А.И.. (a) . (b) . (c) .. (d) . 2 .. (cavitation, hydraulicking ) (abrasion or corrasion, evorsion( ) corrosion) .. vertical erosion) . (lateral erosion) .. 1 (bed load) .. M=cv6 (or r3=kv6 sixth power law), .. 2 . (hydraulic lift) .. 3 (suspended load) .. Critical tractive force( ):Ft= .. (alluvium) .. cohesive force- gravitational force . (bed) .. (longitudinal profile) .. 350 . 1740 .. 1919.)
第一节河流流水作用 河流流水沿沟谷流动，水流动能与水量和流速的平方成正比。水量增加或流速加 大，流水作用能力加强，进行侵蚀，并将侵蚀产物向下游搬运；反之，流水作用
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