Pace of Landscape Change and Pediment Development in the Northeastern Sonoran Desert, United States

Bibliographic Data

ID4752256
AuthorsPhillip H Larson (0000-0001-6556-1640, Minnesota State Colleges and Universities System, corresponding author), Scott B Kelley, Scott Kelley (0000-0002-4860-9590, Arizona State University), Ronald I Dorn (0000-0003-1343-4556, Arizona State University), Y B Seong (0000-0001-6605-3912, Korean Council for University Education)
Year2016
Volume106
Issue6
Pages1195-1216
Publication date2016-11-01
Peer ReviewedYes
Open AccessNo
TypeARTICLE
VenueAnnals of the American Association of Geographers (JOURNAL)
Journal identifiersISSN: 2469-4452 • E-ISSN: 2469-4460
PublisherInforma UK Limited (PUBLISHER • GB)
DOI10.1080/24694452.2016.1201420
OpenAlexW2502028098
LanguageEN
Citations received2
References cited103

Pediments of the Sonoran Desert in the United States have intrigued physical geographers and geomorphologists for nearly a century. These gently sloping bedrock landforms are a staple of the desert landscape that millions visit each year. Despite the long-lived scientific curiosity, an understanding of the processes operating on the pediment has remained elusive. In this study we revisit the extensive history of pediment research. We then apply geospatial, field, and laboratory cosmogenic 10Be nuclide dating and back-scattered electron microscopy methods to assess the pace and processes of landscape change on pediment systems abutting the Salt River in Arizona. Our study focuses on the Usery pediments linked to base-level fluctuations (river terraces) of the Salt River. Relict pediment surfaces were reconstructed with dGPS data and kriging methodologies utilized in ArcGIS—based on preserved evidence of ancient pediment surfaces. 10Be ages of Salt River terraces established a chronology of incision events, where calculating the volume between the reconstructed relict pediment and modern surface topography established minimum erosion rates (∼41 mm/ka to ∼415 mm/ka). Pediment area and length appear to have a positive correlation to erosion rate and development of planar pediment surfaces. Field and laboratory observations reveal that pediment systems adjust and stabilize at each Salt River terrace. Relief reduction across the pediment begins with pediment channel incision via headward erosion. Next, tributary drainage capture begins and collapses interfluves. Lateral stream erosion promotes planation where the porosity of decayed granite along channel banks exceeds the bedrock underneath ephemeral channels

Archaeology · Climate change · Desert (philosophy · Geography · Pace · Political science · Archaeology and Natural History · Geology and Paleoclimatology Research · Tree-ring climate responses · Geology