Hydrogeomorphology of the origin of the Amazon River, the confluence between the Marañón and Ucayali rivers

Author:

Guerrero Leo12ORCID,Abad Jorge D.3ORCID,Ortals Collin4,Valderde Henry2,Estrada Yulissa5,Chicchon Hernan2ORCID,Marin Jesus36ORCID,Canas‐Alva Carlos7

Affiliation:

1. Department of Geography and Anthropology Louisiana State University Louisiana USA

2. Centro de Investigacion y Tecnologia del Agua ‐ CITA Universidad de Ingenieria y Tecnologia ‐ UTEC Lima Peru

3. Department of Research, Education and Development RED YAKU Lima Peru

4. Department of Civil Engineering and Coastal University of Florida Florida USA

5. Universidad Nacional Agraria de la Selva (UNAS) Huánuco Peru

6. School of Life Sciences Arizona State University Arizona USA

7. St. Johns Water Management District, Bureau of Water Resource Information Florida USA

Abstract

AbstractThe origin of the Amazon River is formed at the confluence of the Marañón and Ucayali rivers. Remote sensing and detailed hydrodynamics, sediment transport and bed morphology analysis under different hydrological conditions have been applied to understand the control mechanisms of the modern confluence, thus informing about ancient confluences. Results showed that: 1) meandering‐meandering confluences existed when bifurcated meandering channels from the Marañón River joined the meandering Ucayali River, 2) far‐field scale provided the boundary conditions for the near‐field scale processes. In the case of the Marañón River, the spatial frequency and displacement of incoming anabranching structures to the confluence location set the boundary conditions for the near‐field scale. In the case of the Ucayali River, the incoming hydrodynamics and bed morphology are governed by far‐field processes such as the occurrence of cutoffs, 3) high intensity secondary flows at large rivers were observed at far‐ and near‐field scales, where previous studies have reported that secondary flows are weak or nonexistence or mainly found downstream of confluences. Finally, 4) even though the Marañón River is larger compared with the Ucayali River, the confluence hydrogeomorphology is governed by the Ucayali River because of more developed and stronger secondary flows.

Funder

Gordon and Betty Moore Foundation

Publisher

Wiley

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3