Sediment transport potential in a hydraulically connected river and floodplain‐channel system

2021 ◽  
Author(s):  
Sumaiya Sumaiya ◽  
Jonathan A. Czuba ◽  
John T. Schubert ◽  
Scott R. David ◽  
Graham H. Johnston ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Channel System ◽  
Transport Potential

Sediment transport potential in a channelized floodplain

2020 ◽  
pp. 290-293
Author(s):  
S. Sumaiya ◽  
J.T. Schubert ◽  
J.A. Czuba
Keyword(s):  
Sediment Transport ◽  
Transport Potential

Impacts of macro-turbulent flow on sediment transport potential during ice-covered and open-channel conditions

2020 ◽  
Author(s):  
Eliisa Lotsari ◽  
Maria Kämäri ◽  
Petteri Alho ◽  
Elina Kasvi
Keyword(s):  
Sediment Transport ◽  
Turbulent Flow ◽  
Turbulent Flows ◽  
Open Channel ◽  
Low Flow ◽  
The Arctic ◽  
Flow Structures ◽  
Channel Conditions ◽  
Total Sediment ◽  
Transport Potential

<p>Macro-turbulent flows during ice-covered and open-channel conditions, and their impacts on the total sediment transport, have not been studied widely in northern rivers. Previous studies have detected these processes, for example, only at the inlet area of one meander bend, or only during low discharge conditions. Thus, for understanding their impacts on the total sediment transport, it is needed to detect these macro-turbulent flow structures from a variety of cold region rivers, from multiple years, and also from a variety of different flow magnitude conditions. The pulses of high flow velocities related to these macro-turbulent structures may be important for determining the seasonal total sediment amount transported to the arctic ocean.</p><p> </p><p>The aim is 1) to detect the macro-turbulent flow in a meandering river at ice-covered low flow condition, and compare it to both high and low magnitude open-channel flow conditions. 2) Within a meander bend, the macro-turbulent flow will be compared between its inlet, apex and outlet sections. 3) The shear forces will be analyzed to detect the effects of macro-turbulent flow on potential sediment transport and channel development. The analyses are based on 5–10 minutes long moving boat Acoustic Doppler Current Profiler (ADCP) measurements from a meandering sub-arctic river. The measurements have been done in February and May during 2016–2019, and in September during 2016-2018. The preliminary results of this study are presented. The hypothesis is that the sediment transport potential of a sub-arctic river could be higher during all seasons than previously expected due to the pulses of high velocities related to macro-turbulent flow structures.</p>

Hydrodynamic and Sediment Transport in the Headland of Caofeidian after Reclamation of the Industrial Zone

2013 ◽  
Vol 405-408 ◽  
pp. 1437-1440
Author(s):  
Jing Li ◽  
Yong Ning An ◽  
Hai Chen Sui
Keyword(s):  
Sediment Transport ◽  
Inflection Point ◽  
The West ◽  
Industrial Construction ◽  
Channel System ◽  
Seabed Sediment ◽  
Channel Water ◽  
Deep Channel ◽  
Before And After ◽  
Sea Area

Caofeidian sand island unique shoal-channel system provides construction conditions for deep-water port.By comparing the underwater topography changes before and after Caofeidian industrial construction to understand the sediment transport and erosion-deposition evolution. Bathymetry results in 2006 and 2012 showed that the deep channel is in good stability. 2 to 3 years later after construction, excepting artificial dredging area, erosion occurs in front of the headland. The sediment is transported to the west of harbor 1 entrance. Seabed sediment controlled by wave comes from the front of the southeast seawall inflection point is transported to the deep channel, some deposits in the east slope and the most is taken away by the deep channel water. All processes above become more weakly now, in the future the sea area in front of the headland will erode weakly, the sea area in the west slope will deposit weakly while in the east slope will erode weakly, and the sea area near the harbor entrance will erode.

Research of Sand Drift Potential and Wind Conditions in Xilamuren Grassland

2014 ◽  
Vol 955-959 ◽  
pp. 3499-3504
Author(s):  
Zheng Wen Yue ◽  
Rui Qiang Zhang ◽  
Tian Ming Gao
Keyword(s):  
Sediment Transport ◽  
Wind Direction ◽  
Wind Erosion ◽  
Sand Transport ◽  
Westerly Wind ◽  
Desert Grassland ◽  
Drift Potential ◽  
Variability Index ◽  
Annual Sediment ◽  
Transport Potential

Using the wind data in Xilamuren desert grassland by wind erosion monitoring system to record the years of 2011-2013 as the research foundations, through the statistics of wind and sand transport potential research, from aspect of the characteristics of blown sand environment Xilamuren desert grassland which can be shown the research area are mainly affected by the westerly, Northwest westerly wind or northwest wind three group interaction. The study area of annual sediment potential had mainly effected by westerly and Northwest westerly wind direction ,with wind direction variability index in 0.51°~ 0.61°, belonging to the intermediate ratio range of direction. Annual sediment potential was between 135.95VU ~214.1VU,belongs to the small and medium-sized wind environment. The spring sand transport potential and the resultant sand transporting potential than the other three seasons of sediment transport potential and the resultant sand transporting potential, the main direction of resultant sand transporting potential to Northwest westerly direction, wind direction variability index is relatively large. For spring grassland vegetation coverage rate is lowly, wind speed is large, characteristics of sand is belong to rich material, which should we to retain sand material through the appropriate protective measures to reduce wind erosion. So analyzing the wind regime and the theory of sediment transport potential calculation, provide scientific theoretical basis for the prevention and treatment of sand and harm to the Xilamuren grassland sand flow process.

Intertidal floodplain controls on centennial-scale morphological channel development

2021 ◽  
Author(s):  
Reinier Schrijvershof ◽  
Bas van Maren ◽  
Bart Vermeulen ◽  
Ton Hoitink
Keyword(s):  
Sediment Transport ◽  
Single Channel ◽  
Morphological Development ◽  
Cross Sectional ◽  
Channel System ◽  
Tidal Regime ◽  
Tidal Basins ◽  
Morphological Modelling ◽  
Transport Patterns ◽  
Land Reclamations

<p>Intertidal areas disappear in deltas worldwide because of land reclamations. This greatly impacts delta morphology because the presence and physiological characteristics of intertidal areas determine the tidal regime and, as a result, residual sediment transport patterns in tidal basins. Understanding how the interaction between intertidal areas and channels in tidal basins influence morphodynamics is therefore important to predict morphological development and to assess the resilience of delta’s to changing boundary conditions.</p><p>In the Ems estuary (The Netherlands), the gradual embankment of a large intertidal embayment altered the planform and cross-sectional geometry of the estuary, leading to changes in the tidal regime and associated residual sediment transport patterns. As early as 1952, it was already suggested that these changes eventually caused a shift towards an alternative historical development of the geometric configuration of the channels; from a multiple to a single channel system.</p><p>This study shows through centennial-scale morphological modelling that the observed system shift can be hind-casted, while conserving model validity by comparison to the observed gross morphodynamics trends. The results indicate that the system shift is indeed driven by land reclamations. This provides a unique case to study the processes leading to the observed developments and evaluate the value of tidal-asymmetry based stability relationships to predict regime shifts in estuarine development.</p>

Seasonal variations in erodibility and sediment transport potential in a mesotidal channel-flat complex, Willapa Bay, WA

2013 ◽  
Vol 60 ◽  
pp. S185-S197 ◽  
Author(s):  
Patricia L. Wiberg ◽  
Brent A. Law ◽  
Robert A. Wheatcroft ◽  
Timothy G. Milligan ◽  
Paul S. Hill
Keyword(s):  
Sediment Transport ◽  
Seasonal Variations ◽  
Willapa Bay ◽  
Transport Potential

Analysis of the Multi-Channel Epileptiform EEG Using the Markov Chains Formalism

1989 ◽  
Vol 28 (03) ◽  
pp. 160-167 ◽  
Author(s):  
P. Penczek ◽  
W. Grochulski
Keyword(s):  
Dynamic Behaviour ◽  
Joint Probability ◽  
Drug Effects ◽  
Anticonvulsant Drug ◽  
Channel System ◽  
Markov Network ◽  
Eeg Data ◽  
Multi Level ◽  
Joint Probability Functions ◽  
Dependent State

Abstract:A multi-level scheme of syntactic reduction of the epileptiform EEG data is briefly discussed and the possibilities it opens up in describing the dynamic behaviour of a multi-channel system are indicated. A new algorithm for the inference of a Markov network from finite sets of sample symbol strings is introduced. Formulae for the time-dependent state occupation probabilities, as well as joint probability functions for pairs of channels, are given. An exemplary case of analysis in these terms, taken from an investigation of anticonvulsant drug effects on EEG seizure patterns, is presented.

Sign in / Sign up

Export Citation Format

Share Document