scholarly journals FORMATIVE CONDITION OF BARS AND STREAMS WITH VEGETATION GROWTH UNDER UNSTEADY WATER AND SEDIMENT SUPPLY CONDITION

2006 ◽  
Vol 50 ◽  
pp. 973-978
Author(s):  
Hiroshi TAKEBAYASHI ◽  
Shinji EGASHIRA ◽  
Takeshi OKABE ◽  
Mitsuo TERAOKA
Keyword(s):  
Sediment Supply ◽  
Vegetation Growth ◽  
Water And Sediment ◽  
Supply Condition

Deglacial changes in the strength of deep southern component water and sediment supply at the Argentine continental margin

2017 ◽  
Vol 32 (8) ◽  
pp. 796-812 ◽  
Author(s):  
Grit Warratz ◽  
Rüdiger Henrich ◽  
Ines Voigt ◽  
Cristiano M. Chiessi ◽  
Gerhard Kuhn ◽  
...  
Keyword(s):  
Continental Margin ◽  
Sediment Supply ◽  
Water And Sediment

scholarly journals Effect of Sediment Supply on Morphodynamics of Free Alternate Bars: Insights from Hydrograph Boundary Layer

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3437
Author(s):  
Huang Dai ◽  
Toshiki Iwasaki ◽  
Yasuyuki Shimizu
Keyword(s):  
Boundary Layer ◽  
Sediment Supply ◽  
Negligible Effect ◽  
River Morphology ◽  
Mobile Bed ◽  
Supply Condition ◽  
Alternate Bars ◽  
Limited Length ◽  
Dimensional Simulation ◽  
Specific Impact

Sediment supply plays an essential role in river morphology. However, the specific impact of sediment supply on river morphology is not apparent. According to the hydrograph boundary layer (HBL) concept, upstream riverbed changes caused by the imbalance between sediment supply and the capacity can propagate only a limited length and have a negligible effect on the riverbed beyond such a short length. We performed a two-dimensional morphodynamic calculation to test the concept of HBL, which was proposed under a one-dimensional simulation, meaning that the concept of HBL is still valid for plane changes in river morphology. We employed an unsteady flow with equilibrium or constant sediment supply in a straight, modeled gravel-bedded channel with an unerodible bank to simulate alternate bar morphodynamics. The results show that regardless of the sediment supply condition, the alternate bar features formed downstream of the HBL are considerably similar. This suggests that sediment disturbance at the upstream end has a negligible effect on the mobile-bed dynamic processes, including alternate bar formation and development downstream of the HBL.

scholarly journals Water and sediment supply affect basin-filling sedimentation patterns

Eos ◽  
2013 ◽  
Vol 94 (32) ◽  
pp. 288-288
Author(s):  
Ernie Balcerak
Keyword(s):  
Sediment Supply ◽  
Water And Sediment

scholarly journals Impacts of natural and human drivers on the multi-decadal morphological evolution of tidally-influenced deltas

2018 ◽  
Vol 474 (2219) ◽  
pp. 20180396 ◽  
Author(s):  
B. Angamuthu ◽  
S. E. Darby ◽  
R. J. Nicholls
Keyword(s):  
Environmental Change ◽  
Large Scale ◽  
Morphological Evolution ◽  
Sediment Supply ◽  
Sediment Flux ◽  
Drivers Of Change ◽  
Delta Area ◽  
Sea Levels ◽  
Water And Sediment ◽  
Residual Flows

The world's deltas are at risk of being drowned due to rising relative sea levels as a result of climate change, decreasing supplies of fluvial sediment, and human responses to these changes. This paper analyses how delta morphology evolves over multi-decadal timescales under environmental change using a process-based model. Model simulations over 10 2 years are used to explore the influence of three key classes of environmental change, both individually and in combination: (i) varying combinations of fluvial water and sediment discharges; (ii) varying rates of relative sea-level rise; and (iii) selected human interventions within the delta, comprising polder-dykes and cross-dams. The results indicate that tidal asymmetry and rate of sediment supply together affect residual flows and delta morphodynamics (indicated by sub-aerial delta area, rates of progradation and aggradation). When individual drivers of change act in combination, delta building processes such as the distribution of sediment flux, aggradation, and progradation are disrupted by the presence of isolated polder-dykes or cross-dams. This suggests that such interventions, unless undertaken at a very large scale, can lead to unsustainable delta building processes. Our findings can inform management choices in real-world tidally-influenced deltas, while the methodology can provide insights into other dynamic morphological systems.

Performance of Sumur Gendong (SeDrainPond) Technology on Harvesting Water and Sediment with Respect to Effective Rainy Days

2019 ◽  
Vol 10 (1) ◽  
pp. 41 ◽  
Author(s):  
Ignatius Sriyana ◽  
Imam Wahyudi ◽  
Rick Heikoop ◽  
Kusmiyati Florentina ◽  
Haryono Putro
Keyword(s):  
Water And Sediment ◽  
Rainy Days
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