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NATIONAL SCIENCE FOUNDATION (2020)

Morphodynamics of giant dunes in wind and water

Giant Dunes Wind Water

NATIONAL SCIENCE FOUNDATION

Titre : Morphodynamics of giant dunes in wind and water

Organismes NSF : EAR Division Of Earth Sciences

Durée : September 1, 2020 — August 31, 2022 (Estimated)

Résumé
This study’s primary objective is to develop a unifying framework for bedform morphodynamics that spans environments and scales through studying the morphodynamics of Earth’s largest and most complex bedforms in deserts and rivers. Giant dunes commonly comprise smaller, superimposed dunes climbing up the large dunes stoss. Still, little is known of their topographic structure and translation, how sediment is transported across their structure, and how multiple scales of bedforms can coexist. To improve our understanding of giant dune morphodynamics, Dr. Cisneros will analyze dune morphology and identify the morphodynamics of giant, compound and simple dunes through deploying repeat surveys of river and desert dune areas. These surveys will be conducted on the lowermost Mississippi River, LA, where simple and giant, compound dunes exist, and in the Algodones Dune Field, CA, which comprises giant, compound dunes. Existing data of the White Sands Dune Field, NM will be used for investigation of simple desert dunes. Results of this study provide both research fields with new characterization bedform analysis techniques and methods for quantifying sediment flux, thereby creating an investigative framework of dune morphodynamics. Further, through relating the influence of superimposed dunes to compound dune dynamics in rivers and extrapolating those methods to deserts, this study will unlock the slow-moving morphodynamics of giant dunes on Earth and other planets. The results of this work will contribute to disciplines ranging from planetary sciences, geomorphology, sedimentology, and engineering. This project received co-funding from the Geomorphology and Land-use Dynamics program in the Earth Science division.

Partenaire (s) : Julia Cisneros (Principal Investigator)

Bureau de recherche parrainé  : Cisneros, Julia Champaign IL US 61820-2905

Financement : $174,000.00

National Science Foundation

Page publiée le 24 juin 2021