scholarly journals Regulating Effect of Dongting Lake and Impacts on Runoff in the Jingjiang Reaches of the Yangtze River

2000 ◽  
Vol 12 (2) ◽  
pp. 105-110 ◽  
Author(s):  
LIN Chengkun ◽  
◽  
XU Dingqing ◽  
WU Xiaogen
Keyword(s):  
Yangtze River ◽  
Dongting Lake ◽  
The Yangtze River

scholarly journals Transmission and Prevention of Wuhan Coronavirus Disease 2019 (COVID-19) under Minimum Sunspot Number

2020 ◽  
pp. 13-33
Author(s):  
Tai-Jin Kim
Keyword(s):  
Sunspot Number ◽  
Harmful Algal Blooms ◽  
Yangtze River ◽  
Algal Blooms ◽  
Migratory Birds ◽  
Dongting Lake ◽  
Uvb Radiation ◽  
The Yangtze River ◽  
Wholesale Market ◽  
Mmr Vaccine

Porpoises, infected by Cetacean Morbillivirus from the feces of humpback whales in the East Sea, swam along the Yangtze River to reach Dongting Lake. Infected porpoises could be stranded and moved to Huanan Seafood Wholesale Market. Wuhan is low-lying and susceptible to flooding from the Yangtze River. Agricultural water in Hubei should prevent the harmful algal blooms for clean water. Sterilization by ultraviolet is recommended in air, water and confirmed patient with dialyzer to recover the Wuhan coronavirus disaster. The vaccine can be developed by culturing blood from CeMV infected porpoises in the Yangtze River or Dongting Lake, along with Wuhan coronavirus confirmed patient blood. Existing MMR Vaccine can be applied to cure the confirmed patient. CO2 emissions increased continuously with years (R2= 0.9497) causing high levels of UVB radiation on the Earth. Due to 11 years cycle of the sunspot number, there can be another dangerous outbreak at Dongting Lake with millions of migratory birds in China in coming years between 2030 and 2032.

Ecological water demand in the typical polder of Dongting Lake

2020 ◽  
Author(s):  
Yi Cai ◽  
Lihua Tang ◽  
Dazuo Tian ◽  
Xiaoyi Xu
Keyword(s):  
Water Demand ◽  
Human Activities ◽  
Yangtze River ◽  
Human Impacts ◽  
Dongting Lake ◽  
The Yangtze River ◽  
Ecological Water Demand ◽  
Lake Region ◽  
The Relationship ◽  
Water Ecology

<p>Dongting Lake is the largest lake in the middle reaches of the Yangtze River in China. After the completion of the Three Gorges Project, the relationship between the Yangtze River and Dongting Lake has a significant change with the decreased diversion ratio. Besides, due to the overexploitation of local human activities, some dry-up reaches appeared in the Dongting Lake region, especially in the polders with high strength  human activities. In order to scientifically understand the evolution law of water resources in those protective embankments in lakeside areas, and understand the relationship between human activities and ecosystem stability, the study works on the ecological water demand that coupled with the ecological capacity of the environment. As a typical polder, the Yule polder is selected as a case study in the Dongting Lake region. The objective is to obtain the ecological water demand process which can maintain the requirements of water quantity and quality of water to maintain water ecological needs under the condition of significant human impacts. Based on the actual situation of vegetation coverage, aquatic organism growth status and protection goals, and water demand of the industrial and agricultural population, taking the satisfaction degree of ecological water demand as an indicator, healthy of local water ecology is to be evaluated. Combining the hydrological situation of entire Yangtze River basin, the temporal distribution characteristics of ecological water demand in the Yule polder is analyzed, and also the feasibility of measures such as diverting Yangtze River water to alleviate the fragility of water ecology in the Dongting Lake region is discussed. These results could provide experience for solving similar problems in other regions.</p>

scholarly journals Modal analysis of annual runoff volume and sediment load in the Yangtze river-lake system for the period 1956–2013

2017 ◽  
Vol 76 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Huai Chen ◽  
Lijun Zhu ◽  
Jianzhong Wang ◽  
Hongxia Fan ◽  
Zhihuan Wang
Keyword(s):  
Yangtze River ◽  
Sediment Load ◽  
Poyang Lake ◽  
Southern Oscillation ◽  
Annual Runoff ◽  
Dongting Lake ◽  
Spectrum Estimation ◽  
The Yangtze River ◽  
Runoff Volume ◽  
Lake System

This study focuses on detecting trends in annual runoff volume and sediment load in the Yangtze river-lake system. Times series of annual runoff volume and sediment load at 19 hydrological gauging stations for the period 1956–2013 were collected. Based on the Mann-Kendall test at the 1% significance level, annual sediment loads in the Yangtze River, the Dongting Lake and the Poyang Lake were detected with significantly descending trends. The power spectrum estimation indicated predominant oscillations with periods of 8 and 20 years are embedded in the runoff volume series, probably related to the El Niño Southern Oscillation (2–7 years) and Pacific Decadal Oscillation (20–30 years). Based on dominant components (capturing more than roughly 90% total energy) extracted by the proper orthogonal decomposition method, total change ratios of runoff volume and sediment load during the last 58 years were evaluated. For sediment load, the mean CRT value in the Yangtze River is about −65%, and those in the Dongting Lake and the Poyang Lake are −92.2% and −87.9% respectively. Particularly, the CRT value of the sediment load in the channel inflow of the Dongting Lake is even −99.7%. The Three Gorges Dam has intercepted a large amount of sediment load and decreased the sediment load downstream.

scholarly journals The changing abundance and distribution of Greater White-fronted Geese Anser albifrons in the Yangtze River floodplain: impacts of recent hydrological changes

2012 ◽  
Vol 22 (2) ◽  
pp. 135-143 ◽  
Author(s):  
MEIJUAN ZHAO ◽  
PEIHAO CONG ◽  
MARK BARTER ◽  
ANTHONY D. FOX ◽  
LEI CAO
Keyword(s):  
Yangtze River ◽  
Dongting Lake ◽  
The Yangtze River ◽  
Anser Albifrons ◽  
The Three Gorges ◽  
Hydrological Changes ◽  
Yangtze River Catchment ◽  
Recession Rates ◽  
Sedge Meadows ◽  
Abundance And Distribution

SummaryCount data show that wintering Greater White-fronted Goose Anser albifrons numbers in their Chinese stronghold (the Yangtze River catchment) have fallen from about 140,000 in the late 1980s and early 1990s to c.18,000 now, despite increases in the overall flyway population (mostly wintering in South Korea and Japan). Declines have occurred in Jiangxi, but most markedly in Hunan (predominantly at East Dongting Lake) where the decline has been steady since 2003/2004, with few left from 2008/2009 onwards. Numbers have increased substantially in Anhui (predominantly at Shengjin Lake), which now supports more Greater White-fronted Geese than Jiangxi and Hunan combined. The species appears a habitat specialist in China, confined to grazing short-sward recessional Carex sedge meadows. At East Dongting Lake, reductions in Greater White-fronted Geese numbers correlated with declines in availability of suitable sedge swards, caused by earlier water table recession, which in recent years has meant swards were too tall for geese to utilise from their arrival in autumn. The hydrological changes are most probably due to the commissioning of the Three Gorges Dam in mid-2003. At Shengjin Lake, the increases may be due to recent stable first exposure dates and slow water recession rates which favour short Carex swards attractive to geese; high buffalo grazing density at this lake may also assist in maintaining suitable sward heights. These hypotheses require investigation.

Age, growth, mortality and movement patterns of shortjaw tapertail anchovy, Coilia brachygnathus, in the channel connecting Dongting Lake and the Yangtze River in central China

2017 ◽  
Vol 31 ◽  
pp. 3
Author(s):  
Xiangchao Qin ◽  
Teng Wang ◽  
Pengcheng Lin ◽  
Xue Wang ◽  
Huanzhang Liu
Keyword(s):  
Water Level ◽  
Yangtze River ◽  
Dominant Species ◽  
Movement Patterns ◽  
Dongting Lake ◽  
Central China ◽  
Biological Knowledge ◽  
The Yangtze River ◽  
Migratory Behaviour ◽  
Exploitation Rate

Shortjaw tapertail anchovy, Coilia brachygnathus, is one of the anchovy species that exclusively lives in freshwaters, which is the dominant species in Dongting Lake. In order to explain its success as a dominant species in Dongting Lake, the basic biological knowledge of this species was studied from July 2013 to July 2015 in the channel connecting Dongting Lake and the Yangtze River. A total of 11 064 samples of C. brachygnathus were collected, and their standard length ranged between 6.8 and 35.4 cm. The length–weight relationship was W = 0.0026 L3.057, and von Bertalanffy growth curve was Lt = 36.41(1 − e−0.28(t+0.8)). The exploitation rate (E) of 0.49, indicated no overfishing on this species. Its movement patterns were highly significantly and positively correlated with the rate of variation in water level, discharge and water temperature. When water level (discharge and temperatures) were rising (mainly March to July), C. brachygnathus migrated into Dongting Lake, peaking in May. When the water level (discharge and temperatures) were falling (mainly October to December), the migratory behaviour changed to exiting Dongting Lake, peaking in October. The present study suggests, fast generation time, low exploitation rate and the river–lake movements (migrations) are the possible reasons that made C. brachygnathus a dominant species in this area.

scholarly journals Water-Exchange Response of Downstream River–Lake System to the Flow Regulation of the Three Gorges Reservoir, China

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2394 ◽  
Author(s):  
Junhong Zhang ◽  
Tao Huang ◽  
Lu Chen ◽  
Xiaofang Liu ◽  
Lingling Zhu ◽  
...  
Keyword(s):  
Yangtze River ◽  
Water Exchange ◽  
Dongting Lake ◽  
Ecological Environment ◽  
Lake Area ◽  
Three Gorges ◽  
The Yangtze River ◽  
Lake System ◽  
The Three Gorges ◽  
Hydrological Changes

Hydrological regime changes in the river–lake system and their influences on the ecological environment downstream dams have attracted increasingly more attention all over the world. The Dongting lake downstream of the Three Gorges Dam (TGD) in the Yangtze River has been experiencing a series of hydraulic and hydrological changes over the last decade. The hydrological and ecological influences of the TGD flow regulation on the Dongting river–lake system and its functional mechanism during the impounding periods remain extremely unclear. This study examines the hydrological changes in the Dongting river–lake system based on a 1D/2D coupled hydrodynamic model. In particular, the inflow boundary of the model with and without the TGD was applied with the outflow and inflow of the TGD, respectively, during the same regulation periods. The results show that the diverted flow from the Yangtze River into the Dongting lake and outflow from the lake back to the river drastically decreased during the impounding periods, especially in October. The decreased water exchange between the Yangtze River and the Dongting lake impaired the water residence capacity to some extent in the lake. Stage decrease in the lake area resulted in a significant reduction in the water volume of the Dongting lake with the same time percentage. In addition, the obvious drainage effect in Dongting lake due to the increased stage difference and current speed after the TGD operation was the essential cause of hydrological changes in the lake area. These results provide an improvement in the understanding of impoundment influences on the large river–lake system and give some practical information for ecological environment management in similar river–lake systems.

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