Topographically derived maps of valley networks and drainage density in the Mare Tyrrhenum quadrangle on Mars
Article first published online: 21 SEP 2006
Copyright 2006 by the American Geophysical Union.
Geophysical Research Letters
Volume 33, Issue 18, September 2006
How to Cite
2006), Topographically derived maps of valley networks and drainage density in the Mare Tyrrhenum quadrangle on Mars, Geophys. Res. Lett., 33, L18202, doi:10.1029/2006GL027346., and (
- Issue published online: 21 SEP 2006
- Article first published online: 21 SEP 2006
- Manuscript Accepted: 14 AUG 2006
- Manuscript Revised: 2 AUG 2006
- Manuscript Received: 24 JUN 2006
 A novel, automated technique for delineating Martian valley networks from digital terrain data is applied to the Mare Tyrrhenum quadrangle on Mars, yielding a detailed map for the entire quadrangle. The resultant average value of drainage density for the Noachian part of the quadrangle is D ≈ 0.05 km−1, an order of magnitude higher than the value inferred from a global map based on Viking images, and comparable to the values inferred from the precision mapping of selected focus sites. Valleys are omnipresent in Noachian terrain even outside the “highly dissected” Npld unit. This suggests fluvial erosion throughout the Noachian, implying widespread precipitation. The map of continuous drainage density is constructed to study spatial variations of D. This map reveals significant variations in degree of dissection in Noachian on scale of >100 km. These variations do not correlate with any terrain parameter and their origin requires further study.