straight straight swept sinuous in phase N sinuous out of phase 链状的 catenary in phase catenary out of phase catenary swept 尖头的 新月形的 cuspate lunate rhomboidal VvV 八八八八汽 Y∧m VvVVVv 八八八八八八八 VVyVvvE 八八∧八八八汽 Figure 6. 1 Definition diagrams for many of the descriptive terms used in the description of ripples. Most of the terms can also be applied to larger ripple-like bedforms. the reference axes are x parallel to the current, y vertical and z horizontal and perpendicular to the current Partly after Allen 1968. Ripple marks
Ripple marks rhomboidal 尖头的 新月形的 悬链状的
depth decreases velocity increases Sinuous quo d Ripple marks
Ripple marks
北 0Q 戴 河潮 坪 o0
Asymmetric ripples, 北 戴 河 潮 坪 陆地 ebbing direction ebbing ripples
flooding ripples i0030 北戴河潮坪
parasitic ripples, 北 戴 河 潮 坪 sea flooding ripples ?