scholarly journals Visualization of River Channel Evolution of the South Branch in Yangtze Estuary Supported by GIS

2011 ◽  
Vol 10 ◽  
pp. 1899-1903 ◽  
Author(s):  
Hongbing Hu ◽  
Yulan Zhan
Keyword(s):  
Yangtze Estuary ◽  
River Channel ◽  
The South ◽  
Channel Evolution

THE EFFECT OF BRANCHED CHANNEL MAINTENANCE ON RIVER CHANNEL EVOLUTION DURING FLOODS

2018 ◽  
Vol 74 (5) ◽  
pp. I_1003-I_1008
Author(s):  
Keizo SUMITOMO ◽  
Yasuharu WATANABE ◽  
Norihiro IZUMI ◽  
Satomi YAMAGUCHI ◽  
Mitsuaki YONEMOTO
Keyword(s):  
River Channel ◽  
Channel Evolution ◽  
Channel Maintenance

scholarly journals Provenance Shift during the Plio-Pleistocene in the Vertex of Yangtze Delta and Its Geomorphological Implications

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 996
Author(s):  
Junjie Yu ◽  
Wei Yue ◽  
Ping Liu ◽  
Bo Peng ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Yangtze River ◽  
River Channel ◽  
Heavy Minerals ◽  
Tectonic Subsidence ◽  
Zircon Geochronology ◽  
The Yangtze River ◽  
Yangtze Delta ◽  
The South ◽  
Source To Sink ◽  
Regional Tectonic

One of the key issues of the Source-to-Sink process is revealing the geomorphological evolutions of large rivers from the perspective of river sink areas. This study aims to reveal the provenance change near the vertex of the Yangtze delta during the late Cenozoic and provide insight into the Yangtze channelization into the sea due to regional tectonic subsidence. Heavy minerals and zircon geochronology in the Plio-Pleistocene sediments of the vertex of the modern Yangtze delta (core RGK15) reveal that a significant provenance shift occurred at ~2.6 Ma (the beginning of the Pleistocene). During the Pliocene, ultra-stable heavy minerals and pre-Mesozoic zircon grains predominated in the sediments, probably derived from contemporary outcrops of sedimentary rock that were widely distributed in the delta and its surrounding area. They are completely different from those in the Pliocene sediments of the south delta, indicating that decentralized, local, small watersheds dominated the Yangtze delta during the Pliocene. This resulted from the relatively elevated terrain of this region due to the adjacent ancient Zhejiang–Fujian Uplift (ZFU) at that time. However, diversified heavy minerals and zircon geochronology similar to those of the modern upper Yangtze fingerprints occur in the Pleistocene sediments of core RGK15, implying that a significant provenance shift to the Yangtze River occurred here at ~2.6 Ma. The provenance shift recorded by the cores in the south delta mainly occurred at ~1.2 Ma, indicating that the Yangtze River channel was dragged southward with the further subsidence of the ancient Zhejiang–Fujian Uplift. This study reveals the southward migration process of the Yangtze River channel with the regional tectonic subsidence from the perspective of provenance evolution, which contributes to an understanding of when the Yangtze River channelized into the sea.

River channel evolution and tsunami impacts recorded in local sedimentary archives – the ‘Fiume Morto’ at Ostia Antica (Tiber River, Italy)

Sedimentology ◽  
2020 ◽  
Vol 67 (3) ◽  
pp. 1309-1343 ◽  
Author(s):  
Hanna Hadler ◽  
Peter Fischer ◽  
Lea Obrocki ◽  
Michael Heinzelmann ◽  
Andreas Vött
Keyword(s):  
River Channel ◽  
Channel Evolution ◽  
Tiber River ◽  
Ostia Antica

scholarly journals Modelling the decadal dynamics of reach‐scale river channel evolution and floodplain turnover in CAESAR‐Lisflood

2020 ◽  
Vol 45 (5) ◽  
pp. 1273-1291 ◽  
Author(s):  
Christopher J. Feeney ◽  
Richard C. Chiverrell ◽  
Hugh G. Smith ◽  
Janet M. Hooke ◽  
James R. Cooper
Keyword(s):  
River Channel ◽  
Channel Evolution

Study on the Evolution Mathematical Model for the Downstream Riverbed of Water Conservancy Hub Project

2013 ◽  
Vol 416-417 ◽  
pp. 1776-1780
Author(s):  
Xue Quan Tian
Keyword(s):  
Mathematical Model ◽  
River Channel ◽  
Channel Evolution ◽  
Water Conservancy ◽  
The Mathematical Model ◽  
Evolution Trend

In water conservancy hub projects, an analysis of the downstream river channel evolution is a very important management reference. Through the construction of the mathematical model for riverbed evolution and also using all original parameters, the evolution trend of river channel can be simulated, providing an important reference for management and maintenance, and also proving the deduction of the mathematical model can keep consistent with the actual trend.

scholarly journals Impacts of dam construction on river channel evolution: a case of Minjiang River in Southeastern China

2020 ◽  
Vol 383 ◽  
pp. 341-346
Author(s):  
Ying Yao ◽  
Wei Cui ◽  
Wen Wang ◽  
Fu-Min Ma ◽  
Ben-Yue Chen
Keyword(s):  
Storage Capacity ◽  
River Channel ◽  
Low Flow ◽  
Dam Construction ◽  
Upward Movement ◽  
Southeastern China ◽  
River Sand ◽  
Channel Evolution ◽  
Minjiang River ◽  
River Bed

Abstract. The Minjiang River is the largest river in Fujian Province. In 1993, the Shuikou Reservoir, which has an effective storage capacity of 700 million m3, was built at about 161 km above the estuary. The completion of the Shuikou Dam trapped most of the upstream sediment in the reservoir area, resulting in a drastic decrease in sediment in the lower reaches of the Minjiang River. The average annual sand load at the Zhuqi Station (about 45 km below the dam) was reduced about 2∕3 after the construction of the reservoir, from 7.42 to 2.55 million t by average, resulting in severe river bed downward cutting. At the same time, the demand for the sand in Minjiang River channel is increasing year by year. The amount of mined river sand is greater than the incoming sediment deposited in the river, which intensified the downcutting of the river bed. The downcutting leads to a continuous upward movement of the tide limit in the river channel especially in the low-flow season. Meanwhile, river embankments and river-related structures are damaged, and the navigation capacity of the Minjiang River is reduced. At present, the river bed of the lower Minjiang River is not yet stable, and the river regime is in a state of constant adjustment.

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