Buscar
Mostrando ítems 1-10 de 39
Genesis and sedimentary record of blind channel and islands of the anabranching river: An evolution model
(2018-02-01)
Blind channel (BC) is a fluvial feature formed by attachment of a lateral sand bar to an island or riverbank. It consists of a 10- to 20-m wide and hundreds to thousands meters long channel, parallel to the island or bank, ...
Patterns of anabranching channels: the ultimate end-member adjustment of mega rivers
(Elsevier Science, 2008-10)
Large fluvial systems adjust to a combination of controls to form distinctive channels, which represent a dominant factor in the evolution of floodplain geomorphology and sedimentology. Fluvial geomorphology has commonly ...
Origin, evolution, and sedimentary records of islands in large anabranching tropical rivers: The case of the Upper Paraná River, Brazil
(2020-06-01)
Anabranching patterns are characteristic of the largest rivers in the world. We have chosen to study the Paraná River because of its worldwide importance among the great rivers and the large database available from over ...
FLUVIAL PROCESSES IN ATTACHMENT BARS IN THE UPPER PARANA RIVER, BRAZIL
(Uniao Geomorfologia Brasileira, 2017-07-01)
Bars are semi-submerged fluvial forms associated with the availability of sediments and a temporal dynamic, whose dimensions are controlled by the flow and depth of the channel. Attachment bars are very common in large ...
Why do large rivers tend to form multichannel? A field study in the Upper Paraná RiverPor que grandes rios tendem à canalização múltipla? Um estudo de campo no rio Paraná Superior
(2021-01-01)
Anastomosed rivers include a diverse group of fluvial forms with multiple and interconnected alluvial channels. They occur in a wide range of climates and reliefs and constitute the typical pattern of the mega rivers (Qm ...
Phytoliths indicate environmental changes correlated with facies analysis in a paleo island-lake, Upper Paraná River, Brazil
(2020-04-01)
Phytolith analysis has become a useful tool for paleoenvironmental studies. Phytoliths are produced by plants and are composed of biogenic silica, giving them higher resistance to diagenetic and oxidation processes that ...
COMPARTMENTALIZATION AND GEOMORPHOLOGICAL EVOLUTION OF THE CUIABA RIVER FLOODPLAIN, MATO GROSSO, PANTANAL
(Uniao Geomorfologia Brasileira, 2019-01-01)
The Cuiaba River watershed, located in the state of Mato Grosso, drains an area of approximately 36,000 km(2). When it enters the Pantanal area in Mato Grosso, the Cuiaba river starts depositing the sediments transported ...
Architecture, sedimentary facies and chronology of a composite island: A model from the Upper Paraná River, Brazil
(2021-01-01)
Composite islands that originate from central bars are one of the most frequent types of islands in the Paraná River and in many large rivers in the world. The aim of this study is to highlight island-forming processes and ...
Sponge spicules as indicators of paleoenvironmental changes in island deposits – Upper Paraná River, Brazil
(2019-12-15)
Sediments of fluvial islands are important records for paleoenvironmental and paleoclimatic reconstruction, especially those related to the late Pleistocene and Holocene. The Upper Paraná River (UPR) has numerous ...
Morfologia e hidrodinâmica em rios multicanais (anabranching): exemplo do alto rio Paraná
(Universidade Estadual Paulista (Unesp), 2012-04-13)
A dinâmica do escoamento fluvial é importante para a compreensão das forças atuantes no funcionamento dos processos morfogenéticos fluviais, seja na fase de erosão, de transporte ou de sedimentação. Os rios classificados ...