A Braided River

2013 ◽  
Author(s):  
John Tucker
Keyword(s):  
Braided River

Lithostratigraphy of the Palaeoproterozoic Hekpoort Formation (Pretoria Group, Transvaal Supergroup), South Africa

2020 ◽  
Vol 123 (4) ◽  
pp. 655-668
Author(s):  
N. Lenhardt ◽  
W. Altermann ◽  
F. Humbert ◽  
M. de Kock
Keyword(s):  
South Africa ◽  
Bushveld Complex ◽  
Sedimentary Rocks ◽  
Type Locality ◽  
Large Igneous Province ◽  
Braided River ◽  
River Systems ◽  
The West ◽  
Igneous Province ◽  
Transvaal Supergroup

Abstract The Palaeoproterozoic Hekpoort Formation of the Pretoria Group is a lava-dominated unit that has a basin-wide extent throughout the Transvaal sub-basin of South Africa. Additional correlative units may be present in the Kanye sub-basin of Botswana. The key characteristic of the formation is its general geochemical uniformity. Volcaniclastic and other sedimentary rocks are relatively rare throughout the succession but may be dominant in some locations. Hekpoort Formation outcrops are sporadic throughout the basin and mostly occur in the form of gentle hills and valleys, mainly encircling Archaean domes and the Palaeoproterozoic Bushveld Complex (BC). The unit is exposed in the western Pretoria Group basin, sitting unconformably either on the Timeball Hill Formation or Boshoek Formation, which is lenticular there, and on top of the Boshoek Formation in the east of the basin. The unit is unconformably overlain by the Dwaalheuwel Formation. The type-locality for the Hekpoort Formation is the Hekpoort farm (504 IQ Hekpoort), ca. 60 km to the west-southwest of Pretoria. However, no stratotype has ever been proposed. A lectostratotype, i.e., the Mooikloof area in Pretoria East, that can be enhanced by two reference stratotypes are proposed herein. The Hekpoort Formation was deposited in a cratonic subaerial setting, forming a large igneous province (LIP) in which short-termed localised ponds and small braided river systems existed. It therefore forms one of the major Palaeoproterozoic magmatic events on the Kaapvaal Craton.

He awa whiria—A “Braided River”: An Indigenous Māori Approach to Mixed Methods Research

2021 ◽  
pp. 155868982098402
Author(s):  
Rhiannon Martel ◽  
Matthew Shepherd ◽  
Felicity Goodyear-Smith
Keyword(s):  
Mixed Methods ◽  
New Zealand ◽  
North American ◽  
Mixed Methods Research ◽  
Mixed Methodology ◽  
Braided River ◽  
Research Framework ◽  
Research Philosophy

While literature on mixed methodology predominantly focuses on North American and European philosophical stances, non-Eurocentric worldviews and indigenous philosophies are also relevant to mixed methods research. This article aims to present the indigenous Māori worldview ( te ao Māori) and how this lends itself to mixed methods research, in a New Zealand European and Māori partnership, to conduct bicultural research. The authors use the Māori metaphor He awa whiria (braided river) to describe combining the strengths of two distinct worldviews into a “workable whole.” A framework brings together these two different paradigms as equals, incorporating both numerical and opinion-driven results. The authors illustrate this with a research example of creating a bicultural research framework, underpinned by mixed methods research philosophy.

Effect of microhabitats, mesohabitats and spatial position on macroinvertebrate communities of a braided river

2021 ◽  
pp. 1-10
Author(s):  
Gemma Burgazzi ◽  
Paolo Vezza ◽  
Giovanni Negro ◽  
Luca Astegiano ◽  
Riccardo Pellicanó ◽  
...  
Keyword(s):  
Spatial Position ◽  
Braided River ◽  
Macroinvertebrate Communities

Changes in Braided River Morphology Resulting from Aggradation and Degradation

1993 ◽  
Vol 101 (4) ◽  
pp. 451-466 ◽  
Author(s):  
Dru Germanoski ◽  
S. A. Schumm
Keyword(s):  
River Morphology ◽  
Braided River

scholarly journals Geometry of meandering and braided gravel-bed threads from the Bayanbulak Grassland, Tianshan, P. R. China

2016 ◽  
Vol 4 (1) ◽  
pp. 273-283 ◽  
Author(s):  
François Métivier ◽  
Olivier Devauchelle ◽  
Hugo Chauvet ◽  
Eric Lajeunesse ◽  
Patrick Meunier ◽  
...  
Keyword(s):  
Grain Size ◽  
Scaling Laws ◽  
Sedimentary Basin ◽  
Bedload Transport ◽  
Braided River ◽  
Statistical Distributions ◽  
Meandering Rivers ◽  
Gravel Bed ◽  
Threshold Theory ◽  
Gravel Bed Rivers

Abstract. The Bayanbulak Grassland, Tianshan, P. R. China, is located in an intramontane sedimentary basin where meandering and braided gravel-bed rivers coexist under the same climatic and geological settings. We report and compare measurements of the discharge, width, depth, slope and grain size of individual threads from these braided and meandering rivers. Both types of threads share statistically indistinguishable regime relations. Their depths and slopes compare well with the threshold theory, but they are wider than predicted by this theory. These findings are reminiscent of previous observations from similar gravel-bed rivers. Using the scaling laws of the threshold theory, we detrend our data with respect to discharge to produce a homogeneous statistical ensemble of width, depth and slope measurements. The statistical distributions of these dimensionless quantities are similar for braided and meandering threads. This suggests that a braided river is a collection of intertwined threads, which individually resemble those of meandering rivers. Given the environmental conditions in Bayanbulak, we furthermore hypothesize that bedload transport causes the threads to be wider than predicted by the threshold theory.

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