Abstract
Cross-sectional morphologies of channels and valleys on Venus are of special importance in discussing their formation processes both qualitatively and quantitatively. We have already reconstructed cross-sectional and depth profiles of some canali and sinuous rilles, which are both representative channel types on Venus, using a new radar clinometric method. And we reported that the sinuous rilles and canali may have formed by mechanical and thermal erosion, respectively. This time, we reconstruct cross-sectional and depth profiles of some valley networks, and examine the relationship between the flow direction and the surrounding terrain. Valley networks often occur in the vicinity of or in connection to sinuous rilles. In addition, transitional morphology between sinuous rilles and valley networks is observed in both landforms. Therefore formation of the valley networks seems to be related to that of the sinuous rilles. As a result of our analyses, the valley networks likely have formed under a strong structural control compared with sinuous rilles and have originated with diverse formation mechanisms.
