Hybrid event beds generated by erosional bulking of modern hyperpycnal flows on the Choshui River delta front, Taiwan Strait

Sedimentology ◽  
2021 ◽  
Author(s):  
Lina Jin ◽  
Xin Shan ◽  
Xuefa Shi ◽  
Marco Fonnesu ◽  
Shuqing Qiao ◽  
...  
Keyword(s):  
Taiwan Strait ◽  
River Delta ◽  
Delta Front ◽  
Hyperpycnal Flows ◽  
Hybrid Event

Wave-induced shallow slides and their features on the subaqueous Yellow River delta

2009 ◽  
Vol 46 (12) ◽  
pp. 1406-1417 ◽  
Author(s):  
Guohui Xu ◽  
Yongfu Sun ◽  
Xin Wang ◽  
Guanghai Hu ◽  
Yupeng Song
Keyword(s):  
Yellow River ◽  
Yellow River Delta ◽  
River Delta ◽  
Slope Instability ◽  
Delta Front ◽  
The Yellow River Delta ◽  
Slide Mass ◽  
Wave Induced ◽  
Water Depths ◽  
Surrounding Soil

Slope instability processes occur widely on the underwater slopes of the Yellow River delta during storms. Roughly circular depressions on the upper delta front in water depths of 4 to 8 m have been detected by acoustic surveying and their processes were observed in the laboratory. This paper analyzes the properties of geomorphic and acoustic profiles of the upper delta front and compares the engineering geologic properties of samples from the disturbed and undisturbed areas. The results indicate that the weak superficial mass could oscillate with waves and the oscillation weakened the surrounding soil under the cyclic loading. The stratum was disturbed or even destroyed with depth, the area of the slide mass enlarged gradually, and finally a collapse depression formed.

Submarine Geomorphology & Geology Of The Mississippi River Delta Front

1979 ◽  
Author(s):  
P.K. Trabant ◽  
W.R. Bryant ◽  
J.M. Coleman
Keyword(s):  
Mississippi River ◽  
River Delta ◽  
Mississippi River Delta ◽  
Delta Front

scholarly journals Effect of Wave, Current, and Lutocline on Sediment Resuspension in Yellow River Delta-Front

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 845 ◽  
Author(s):  
Bowen Li ◽  
Yonggang Jia ◽  
J. Paul Liu ◽  
Xiaolei Liu ◽  
Zhenhao Wang
Keyword(s):  
Suspended Sediment ◽  
Yellow River ◽  
Yellow River Delta ◽  
Sediment Concentration ◽  
River Delta ◽  
Low Flow ◽  
The Yellow River ◽  
Delta Front ◽  
The Yellow River Delta ◽  
Hindered Settling

Historically, the Yellow River in China discharges > 1 × 109 ton/yr sediment to the sea, and has formed a large delta in the western Bohai Sea. Its river mouth is characterized by an extremely high suspended sediment concentration (SSC), up to 50 g/L. However, the hydrodynamic factors controlling the high suspended sediments in the Yellow River estuary are not well understood. Here, we conducted two hydrodynamic observations and SSC measurements in the winter and spring low-flow seasons of 2014–2015 and 2016–2017 under five sea conditions, including calm-rippled, smooth-wavelet, slight, moderate, and rough, in the Yellow River Delta-front during the observation period. Under calm-rippled conditions, the contribution of currents to the total resuspended sediment concentration (RSC) was 77.7%–100.0%. During the smooth-wavelet and slight periods, the currents’ contribution decreased as low as 30% and 3.0% of the total RSC, respectively. Under moderate and rough-sea conditions, waves accounted for at least 70% and 85% of the total RSC, respectively. The results indicate that 20 cm-thick lutoclines were created after a significant increase in the wave height to a peak value followed by a decrease. When the SSC is over 3 g/L and hydrodynamic conditions could not break the lutoclines, the flocculent settling of suspended sediment changes to hindered settling in the Yellow River Delta. Under hindered settling, the settling velocity decreases, and the resuspended sediments remains in the lutoclines and their lower water layers. This study reveals different controlling factors for the high SSC near a river-influenced delta, and helps us get a better understanding of a delta’s resuspension and settling mechanisms.

Slave River delta: geomorphology, sedimentology, and Holocene reconstruction

1988 ◽  
Vol 25 (12) ◽  
pp. 1990-2004 ◽  
Author(s):  
Sandy Vanderburgh ◽  
Derald G. Smith
Keyword(s):  
River Delta ◽  
Delta Front ◽  
Average Width ◽  
Sand Waves ◽  
Isostatic Rebound ◽  
Great Slave Lake ◽  
Sand Body ◽  
Fort Smith ◽  
River Rapids ◽  
Slave River Delta

The Holocene Slave River delta (8300 km2) is a long (170 km), narrow (42 km average width) alluvial sand body, which extends north from the Slave River rapids at Fort Smith to Great Slave Lake, Northwest Territories. The delta is flanked by the Talston and Tethul rivers and Canadian Shield to the east and by the Little Buffalo River to the west. Wave-associated sedimentary structures in lithostratigraphic logs from river cutbanks indicate that the sandy delta was wave influenced. Most of the logs (34) consist of three facies: basal laminated mud (unknown thickness), interbedded mud and sand (2.5 m), and planar-tabular ripple sets interbedded with cross-laminated to flat-bedded sand (3.0–14.5 m).Eleven radiocarbon-dated wood samples from river cutbanks were used to reconstruct the delta paleoshoreface and to calculate the rate of progradation, which averaged 20.7 m/year from 8070 BP to the present. In the same period isostatic rebound of the delta region relative to the Liard River delta averaged 12 cm/km (a total rebound of 48 m). The data were calculated normal to the retreating Laurentide ice front.From the surface to depths of 59 m, the subaerial and subaqueous delta front exhibits barrier islands, lagoons, offshore bars or sand waves, tensional cracks, slumps and pressure ridges. The barriers and offshore bars consist of medium grain-sized sand, whereas the slumps and pressure ridges are interpreted as mud.

scholarly journals Highly Dynamic Partitioning of Iron-Bound Organic Carbon in a Large-River Delta-Front Estuary

2020 ◽  
Author(s):  
Bin Zhao ◽  
Peng Yao ◽  
Thomas S. Bianchi ◽  
Xuchen Wang ◽  
Zhigang Yu
Keyword(s):  
Organic Carbon ◽  
Large River ◽  
River Delta ◽  
Delta Front ◽  
Dynamic Partitioning ◽  
Large River Delta

DECLINE OF THE SUBAQUEOUS MISSISSIPPI RIVER DELTA FRONT: IMPLICATIONS FOR MUDFLOW HAZARD

2016 ◽  
Author(s):  
Jillian Maloney ◽  
◽  
Samuel J. Bentley ◽  
Jeff Obelcz ◽  
Kehui Xu ◽  
...  
Keyword(s):  
Mississippi River ◽  
River Delta ◽  
Mississippi River Delta ◽  
Delta Front
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