来吊个书袋 V-shaped valley: A valley having a pronounced cross profile suggesting the form of the letter "V", characterized by steep sides and short turbutaries; specif. a young, narrow valley resulting from downcutting by a stream. The "V" becomes broader as the amount of mass wasting increases. U-shaped valley: A valley having a pronounced parabolic cross profile suggesting the form of a broad letter "U", with steep wall and a broad nearly flat floor; specif. a valley carved by glacial erosion, such as a glacial trough. Ref: glossary of geology, 4th edtion. 结论: 是的 的确似乎没有很严谨的width/depth这种可能的数值化定义 但如此系用floor的narrow和broad做讨论的话 结果应该其实还算明显 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 61.230.70.209