Fluvial sediment transfer in the Changjiang (Yangtze) river-estuary depositional system

Dai, Zhijun; Mei, Xuefei; Darby, Stephen E.; Lou, Yaying; Li, Weihua

doi:10.1016/j.jhydrol.2018.09.019

Cited by 159 publications

(71 citation statements)

References 58 publications

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“…On the other hand, the heavy rainfall brought by a typhoon rapidly increases river runoff into the sea, and a large amount of land-based materials are washed away and brought into the estuary offshore area [47][48][49][50]. These changes due to the influence of a typhoon significantly affect the physical, chemical and biological processes of estuarine offshore waters, which in turn have an impact on the structure and function of the ecosystem [51][52][53]. Studying the changes of the estuarine nearshore environment under the influence of a typhoon and its ecological effects are of great importance for further understanding the evolution process of ecosystems in this region on a long-term scale [8,54].…”

Section: Sea Surface Salinity Response To Tropical Cyclonesmentioning

confidence: 99%

Response of the Coastal Ocean to Tropical Cyclones

Wu¹,

Conde²

2020

Current Topics in Tropical Cyclone Research

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The Northwest Pacific and the South China Sea region are the birthplaces of most monsoon disturbances and tropical cyclones and are an important channel for the generation and transmission of water vapor. The Northwest Pacific plays a major role in regulating interdecadal and long-term changes in climate. China experiences the largest number of typhoon landfalls and the most destructive power affected by typhoons in the world. The hidden dangers of typhoon disasters are accelerating with the acceleration of urbanization, the rapid development of economic construction and global warming. The coastal cities are the most dynamic and affluent areas of China's economic development. They are the strong magnetic field that attracts international capital in China, and are also the most densely populated areas and important port groups in China. Although these regions are highly developed, they are vulnerable to disasters. When typhoons hit, the economic losses and casualties caused by gale, heavy rain and storm surges were particularly serious. This chapter reviews the response of coastal ocean to tropical cyclones, included sea surface temperature, sea surface salinity, storm surge simulation and extreme rainfall under the influence of tropical cyclones.

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Section: Sea Surface Salinity Response To Tropical Cyclonesmentioning

confidence: 99%

Response of the Coastal Ocean to Tropical Cyclones

Wu¹,

Conde²

2020

Current Topics in Tropical Cyclone Research

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“…While precipitation was responsible for the variations in and periodicity of the total water discharge of the Changjiang River, dams also profoundly impacted the pattern of discharge distribution [19]. As shown in Figure 1, the TGD and GD were constructed in the mainstream of the Changjiang River, and the DR was built in the mainstream of Hanjiang River, which is the largest tributary of the Changjiang River, contributing 7% to runoff through the middle stream [37]. Here, we mainly analyze the influence of the above three large dams.…”

Section: Influence Of the Damsmentioning

confidence: 99%

“…At present, river systems worldwide have been extensively altered by anthropogenic stressors, such as large-scale damming and water diversions, which are challenging the integrity and future of these large rivers [41]. In addition, the rapidity and extent of such an impact on mega-Changjiang is particularly evident and may be irreparable [37]. The total capacity of reservoirs constructed in the Changjiang catchment was as high as 358.8 billion m 3 in 2016, which accounted for approximately 40% of the annual runoff through Datong, and it has been predicted that the total capacity will continuously increase, owing to 100 river engineering construction projects (http://news.bjx.com.cn/html/20190617/ 986650.shtml).…”

Section: Sustainability In the Futurementioning

confidence: 99%

Impacts of River Engineering on Multi-Decadal Water Discharge of the Mega-Changjiang River

Pang

Lou

et al. 2020

Sustainability

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Knowledge of river engineering impacts on water discharge is significant to flow guidelines and sustainable water resource managements for balancing human consumption and the natural environment. In this study, based on the collected multi-decadal discharge data at Yichang, Hankou, and Datong stations, we determined that in October, Three Gorges Dam contributed 34.4%, 24.5%, and 18.7% to the discharge decrease in the upper, middle, and lower reach, respectively, while Gezhouba Dam contributed 14.5%, 10.7%, and 10%. Danjiangkou Reservoir caused the discharge ratio of Hanjiang to Changjiang to decline from 7.2% during 1954–1973 to 6.3% during 1973–2014. Owing to growing water withdrawal and consumption, we suggest that the distribution of water diversion and consumption should be regulated to prevent the probable occurrence of the severe issue of salt water intrusion in the Changjiang Estuary in 2028.

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“…On the other hand, the heavy rainfall brought by a typhoon rapidly increases river runoff into the sea, and a large amount of land-based materials are washed away and brought into the estuary offshore area [17][18][19][20]. These changes due to the influence of a typhoon significantly affect the physical, chemical and biological processes of estuarine offshore waters, which in turn have an impact on the structure and function of the ecosystem [13,[21][22][23]. Studying the changes of the estuarine nearshore environment under the influence of a typhoon and its ecological effects are of great importance for further understanding the evolution process of ecosystems in this region on a long-term scale [24,25].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Fresh and Salt Water Distribution in the Pearl River Estuary during a Typhoon Using a Fully Coupled Atmosphere-Wave-Ocean Model

Chen

Jiang

et al. 2019

Water

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Typhoons are major marine dynamic disasters that affect the coastal ocean areas of China. During a typhoon, the coupling dynamic factors, such as wind, waves, storm surges, and river runoff, greatly enhance the mass and energy exchange at the various interfaces of the ocean. A fully coupled atmosphere-wave-ocean model in the South China Sea (SCS) was established based on the WRF, SWAN, and ROMS models. The variation of sea surface salinity (SSS) and ocean subsurface salinity caused by Typhoon Kai-tak (201213) was analyzed by the fully coupled model, and the basic characteristics of the response of the upper ocean to the typhoon are given in this paper. The simulation results demonstrate that the salinity of the sea surface showed a sharp change during Typhoon Kai-tak, and it changed gradually after entering the recovery period. During the passage of Typhoon Kai-tak, the disturbance caused by strong winds strengthened the mixing process of the water in the Pearl River Estuary (PRE) and its adjacent waters. As the typhoon developed, under the influence of Ekman pumping, the mixing effect between the subsurface and the bottom and the upper water was obvious. Before the impact of Typhoon Kai-tak, the salinity had obvious stratification characteristics along the water depth. Due to the influence of the storm surge, the surface water with increased salinity was transported to the estuary, which led to an increase in the salinity of the estuary’s surface water. In this condition, it is highly likely for there to be saltwater intrusion. The salinity distribution characteristics of three schemes (ROMS model only, coupled WRF-ROMS model, and fully coupled WRF-SWAN-ROMS model) were compared in this study. In the fully coupled WRF-SWAN-ROMS model, the disturbance of the bottom water was the most obvious, and the salinity value was greater than that of the coupled WRF-ROMS model, which indicates that under the influence of waves, the mixing and exchange abilities were strengthened.

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Fluvial sediment transfer in the Changjiang (Yangtze) river-estuary depositional system

Abstract: He is a hydro-geomorphologist with recent studies on sediment transport, migration, and river erosion along mega-river of the world.

Cited by 159 publications

References 58 publications

Response of the Coastal Ocean to Tropical Cyclones

Response of the Coastal Ocean to Tropical Cyclones

Impacts of River Engineering on Multi-Decadal Water Discharge of the Mega-Changjiang River

Numerical Investigation of Fresh and Salt Water Distribution in the Pearl River Estuary during a Typhoon Using a Fully Coupled Atmosphere-Wave-Ocean Model

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