scholarly journals Living landscapes: Muddy and vegetated floodplain effects on fluvial pattern in an incised river

2018 ◽  
Vol 43 (14) ◽  
pp. 2948-2963 ◽  
Author(s):  
Maarten G. Kleinhans ◽  
Bente de Vries ◽  
Lisanne Braat ◽  
Mijke van Oorschot
Keyword(s):  
Vegetated Floodplain

Lateral Distributions of Depth-Averaged Velocity in Compound Channels with Submerged Vegetated Floodplains

2014 ◽  
Vol 641-642 ◽  
pp. 288-299
Author(s):  
Ming Wu Zhang ◽  
Chun Bo Jiang ◽  
He Qing Huang
Keyword(s):  
Experimental Data ◽  
Analytical Solution ◽  
Rectangular Channel ◽  
Navier Stokes ◽  
Compound Channel ◽  
Navier Stokes Equation ◽  
Compound Channels ◽  
Vegetated Floodplain ◽  
Vegetation Layer ◽  
Good Agreement

Lateral distributions of depth-averaged velocity in open compound channels with submerged vegetated floodplains are analyzed, based on an analytical solution to the depth-integrated Reynolds-Averaged Navier-Stokes equation with a term included to account for the effects of vegetation. The cases of open channels are: rectangular channel with submerged vegetated corner, and compound channel with submerged vegetated floodplain. The present paper proposes a method for predicting lateral distribution of the depth-averaged velocity with submerged vegetated floodplains. The method is based on a two-layer approach where flow above and through the vegetation layer is described separately. An experiment in compound channel with submerged vegetated floodplain is carried out for the present research. The analytical solutions of the three cases are compared with experimental data. The corresponding analytical depth-averaged velocity distributions show good agreement with the experimental data.

scholarly journals Life in the fluvial hinterland of the late Sarmatian Sea (middle Miocene): a rare terrestrial fossil site in the Styrian Basin (Austria)

2018 ◽  
Vol 69 (1) ◽  
pp. 30-50 ◽  
Author(s):  
Monika Doubrawa ◽  
Martin Gross ◽  
Mathias Harzhauser
Keyword(s):  
Middle Miocene ◽  
Freshwater Pond ◽  
Abandoned Channel ◽  
Late Middle Miocene ◽  
Styrian Basin ◽  
Terrestrial Habitats ◽  
Fossil Site ◽  
Vegetated Floodplain ◽  
Insight Into ◽  
Terrestrial Gastropod

AbstractThis paper describes the section and fossil content of a former gravel pit in the Eastern Styrian Basin (SE Austria), which exposes sediments of a fluvial system, ranging from within channel to overbank environments. A predominately terrestrial gastropod fauna of 15 species so far, was recovered from a palaeosol formed in a moist and vegetated, floodplain or abandoned channel. Up-section, a shallow freshwater pond/lake developed within the floodplain, settled by fishes, molluscs and ostracods. By integrating regional geological and biostratigraphical data derived from the terrestrial gastropod fauna as well as from the other recovered biota, these strata are of late middle Miocene (late Sarmatian s.str.) age. Hence, this fossil site provides a rare insight into the terrestrial habitats in the hinterland of the Sarmatian Sea and their biota, which are otherwise barely known in Central Europe.

scholarly journals The Pennsylvanian Springhill Mines Formation: sedimentological framework for a portion of the Joggins Fossil Cliffs UNESCO World Heritage Site

2014 ◽  
Vol 50 ◽  
pp. 249 ◽  
Author(s):  
Michael C. Rygel ◽  
Erin P. Sheldon ◽  
Matthew R. Stimson ◽  
John H. Calder ◽  
Kyle T. Ashley ◽  
...  
Keyword(s):  
World Heritage ◽  
Lower Half ◽  
World Heritage Site ◽  
Unesco World Heritage ◽  
Meandering Channel ◽  
Heritage Site ◽  
Unesco World Heritage Site ◽  
Flooding Event ◽  
Vegetated Floodplain

This is the first detailed study of the coastal exposure of the Springhill Mines Formation within the Joggins Fossil Cliffs World Heritage Site. A 16.9-m-thick interval of dark laminated mudrocks and sharpbased sandstones at the base of our section is reassigned to the top of the Joggins Formation. This interval records a rapid, presumably widespread flooding event and the temporary establishment of a marginalmarine to brackish bay. The overlying 697 m of strata represent deposition in poorly drained and well-drained environments, and are assigned to the Springhill Mines Formation. Strata reflecting poorly drained environments contain green and grey mudrocks, thin coals, sheet sandstones, and channel bodies interpreted to have been deposited in coastal swamps and low-lying parts of a floodplain. Intervals reflecting well-drained conditions contain reddish brown mudrocks, sheet sandstones, and channel bodies interpreted to have been deposited on a vegetated floodplain that was periodically exposed to oxidizing conditions. Strata reflecting poorly drained conditions are thick and abundant in the lower half of the formation and well-drained intervals become thick and more abundant in the upper half. The shift in facies abundance is accompanied by an interpreted evolution in fluvial style from predominantly anastomosed channels (below 376 m) to sheet-like channel bodies (376–449 m) and ultimately to predominantly meandering-channel bodies (449–697 m). The formation-scale changes in drainage conditions and fluvial style records decreased halokinetic subsidence and aggradation of the alluvial surface as sediments shed from the Caledonia Highlands prograded into this part of the basin.

scholarly journals Developing an algorithm for enhancement of a digital terrain model for a densely vegetated floodplain wetland

2016 ◽  
Vol 10 (3) ◽  
pp. 036013 ◽  
Author(s):  
Dorota Miroslaw-Swiatek ◽  
Sylwia Szporak-Wasilewska ◽  
Robert Michalowski ◽  
Ignacy Kardel ◽  
Mateusz Grygoruk
Keyword(s):  
Digital Terrain Model ◽  
Floodplain Wetland ◽  
Terrain Model ◽  
Digital Terrain ◽  
Vegetated Floodplain

scholarly journals Application of a 3D numerical model to a river with vegetated floodplains

2003 ◽  
Vol 5 (2) ◽  
pp. 99-112 ◽  
Author(s):  
T. Stoesser ◽  
C. A. M. E. Wilson ◽  
P. D. Bates ◽  
A. Dittrich
Keyword(s):  
Drag Force ◽  
Large Scale ◽  
Three Dimensional ◽  
West Germany ◽  
Plant Distribution ◽  
Turbulence Closure ◽  
River Rhine ◽  
Plant Populations ◽  
Vegetated Floodplain ◽  
Water Elevation

This paper describes the application of a three-dimensional computational fluid dynamics code to a large-scale river scheme. One of the primary aims of this paper is to provide a tool, which utilises a roughness closure derived from physical processes, requiring minimal calibration. Accordingly, a roughness closure based on the traditional drag-force approach is implemented. Unlike other implementations of this approach, the drag force is only introduced in the momentum equations and not into the turbulence closure. This ensures that the coefficients of the turbulence closure model (in this case the k−ε scheme) do not require recalibration for each application. An existing vegetated floodplain is used as a reference site and parameters characterising the dimensions of riparian vegetation and its distribution are quantified. A 100 year flood event on a considerable reach length (3500 m) of the lower River Rhine in South-West Germany is then simulated. Mean floodplain velocities are measured using dilution gauging techniques and these are compared with the computed values. Given information such as plant distribution and geometric properties of the various plant populations, the proposed tool can predict floodplain velocities, water elevation and hydrodynamic features indicative of vegetated compound channel flow.

Longitudinal dispersion in waterways with vegetated floodplain

2015 ◽  
Vol 84 ◽  
pp. 398-407 ◽  
Author(s):  
Hossein Hamidifar ◽  
Mohammad Hossein Omid ◽  
Alireza Keshavarzi
Keyword(s):  
Longitudinal Dispersion ◽  
Vegetated Floodplain
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