scholarly journals A modeling study of the influences of Yangtze River and local catchment on the development of floods in Poyang Lake, China

2016 ◽  
Vol 47 (S1) ◽  
pp. 102-119 ◽  
Author(s):  
Xianghu Li ◽  
Jing Yao ◽  
Yunliang Li ◽  
Qi Zhang ◽  
Chong-Yu Xu
Keyword(s):  
Yangtze River ◽  
Lake Level ◽  
Poyang Lake ◽  
Hydrological Regime ◽  
The Yangtze River ◽  
Lake Level Changes ◽  
The North ◽  
Physically Based ◽  
North And South ◽  
Catchment Runoff

Poyang Lake, one of the most frequently flooded regions in China, connects with the Yangtze River and the five sub-tributaries in the local catchment. The lake's hydrological regime is complicated by a complex hydraulic connection and strong river–lake interaction, especially for the extreme hydrological regime. This study analyzes the relationships between the lake level changes and the flow regimes of Yangtze River and local catchment during the flood season and employs a physically based hydrodynamic model to quantify their relative contributions to the development of floods. The study found that the large catchment runoff and Yangtze River discharge were both significant contributors to flood development but that their contributions were unevenly distributed in time and space. The local catchment imposed more influence during the period of April–May and at the middle parts of the lake, and its influence decreased toward the north and south; in contrast, the most remarkable lake level changes were observed in July–August and at the northern lake for the Yangtze River cases, and these changes reduced from north to south. Moreover, Yangtze River imposed far stronger influences on the lake level changes than the catchment runoff and dominated the duration of floods to a great extent.

scholarly journals Temporal and Spatial Distributions of Ecological Vulnerability under the Influence of Natural and Anthropogenic Factors in an Eco-Province under Construction in China

2018 ◽  
Vol 10 (9) ◽  
pp. 3087 ◽  
Author(s):  
Qian Ding ◽  
Xun Shi ◽  
Dafang Zhuang ◽  
Yong Wang
Keyword(s):  
Yangtze River ◽  
Principal Component ◽  
Anthropogenic Factors ◽  
Land Resource ◽  
The Yangtze River ◽  
Irrigation Channel ◽  
The North ◽  
Ecological Vulnerability ◽  
Under Construction ◽  
Natural And Anthropogenic Factors

Ecological vulnerability evaluations can provide a scientific foundation for ecological environment management. Studies of ecological vulnerability have mainly focused on typical ecologically vulnerable regions with poor natural conditions or severe human interference, and such studies have rarely considered eco-provinces. Taking Jiangsu, an eco-province under construction in China, as the study area, we evaluated the spatiotemporal distributions of ecological vulnerability in 2005, 2010 and 2015 at the kilometer grid scale and analyzed the effects of natural and anthropogenic factors on ecological vulnerability. The pressure state response model (PSR), geographic information systems (GIS), spatial principal component analysis, spatial autocorrelation analysis, and correlation analysis methods were used. The results of the study are as follows: (i) the effects of anthropogenic factors on ecological vulnerability are greater than those of natural factors, and landscape evenness and the land resource utilization degree are the main factors that influence ecological vulnerability. (ii) Jiangsu Province is generally lightly to moderately vulnerable. Slight vulnerability is mainly observed in areas with water bodies. Light vulnerability is concentrated in paddy fields between the Main Irrigation Channel of North Jiangsu and the Yangtze River. Medium, heavy and extreme vulnerability areas are mainly composed of arable and built-up land. Medium vulnerability is mainly distributed to the north of the Main Irrigation Channel of North Jiangsu; heavy vulnerability is scattered to the south of the Yangtze River and in north-western hilly areas; and extreme vulnerability is concentrated in hilly areas; (iii) Ecological vulnerability displays a clustering characteristic. High-high (HH) regions are mainly distributed in heavy and extreme vulnerability regions, and low-low (LL) regions are located in slight vulnerability areas. (iv) Ecological vulnerability has gradually deteriorated. From 2005 to 2010, the vulnerability in hilly areas considerably increased, and from 2010 to 2015, the vulnerability in urban and north-eastern coastal built-up land areas significantly increased. Emphasis should be placed on the prevention and control of ecological vulnerability in high-altitude, urban and coastal areas.

scholarly journals Analysis on the Water Exchange between the Main Stream of the Yangtze River and the Poyang Lake

2011 ◽  
Vol 10 ◽  
pp. 2256-2264 ◽  
Author(s):  
Junkai Zhao ◽  
Jiufa Li ◽  
Hong Yan ◽  
Lin Zheng ◽  
Zhijun Dai
Keyword(s):  
Yangtze River ◽  
Water Exchange ◽  
Poyang Lake ◽  
Main Stream ◽  
The Yangtze River

Chinese Communist Treatment of the Origins and the Foundation of the Chinese Empire

1965 ◽  
Vol 23 ◽  
pp. 78-105 ◽  
Author(s):  
A. F. P. Hulsewé
Keyword(s):  
Yangtze River ◽  
Fourth Century ◽  
Fifth Century ◽  
The Yangtze River ◽  
The South ◽  
The West ◽  
Warring States ◽  
North East ◽  
The North ◽  
Chinese Empire

In antiquity, China was far from being the China we know today, neither in extent, nor in political and social organisation. To the south it did not extend beyond the Yangtze River, to the north it stopped short of the Mongolian steppe, to the north-east, only a small part of the south Manchurian plain was included, whereas in the west it merely went up to the easternmost part of what is now Kansu Province; the Szechwan plain was only included at the end of the fourth century B.C. Politically, the King of Chou was theoretically the overlord of most of this area, but in actual practice, independent rulers reigned over a congeries of larger and smaller states. As a result of wars of conquest, seven large states had come to be formed by the middle of the fifth century B.C. and these were engaged in a ceaseless struggle for supremacy. The time between the middle of the fifth century and 221 B.C., when the western state of Ch'in finally conquered all its rivals, is known as the period of the Warring States.

scholarly journals Changes in Tundra Swan Cygnus columbianus bewickii distribution and abundance in the Yangtze River floodplain

2011 ◽  
Vol 21 (3) ◽  
pp. 260-265 ◽  
Author(s):  
PEIHAO CONG ◽  
LEI CAO ◽  
ANTHONY D. FOX ◽  
MARK BARTER ◽  
EILEEN C. REES ◽  
...  
Keyword(s):  
Water Quality ◽  
Yangtze River ◽  
Poyang Lake ◽  
Submerged Vegetation ◽  
Three Gorges ◽  
The Yangtze River ◽  
Vegetation Productivity ◽  
River Floodplain ◽  
Cygnus Columbianus ◽  
Tundra Swan

Approximately 75% of the East Asian Flyway Tundra Swan Cygnus columbianus bewickii population winters in the Yangtze River floodplain, China. Historically the species was more widely distributed throughout the floodplain but now most of the population is confined to five wetlands in Anhui Province and to Poyang Lake in Jiangxi Province, where the majority (up to 113,000 birds) occur. Within-winter counts suggest that swans congregate at Poyang Lake before dispersing to other sites later in the winter. Counts show large between-year fluctuations, but suggest declines at Shengjin and Fengsha Lakes (both in Anhui) during the last five years. Declines at Shengjin Lake are likely due to decreases in submerged vegetation (particularly tuber-producing Vallisneria, a major food item) perhaps linked to eutrophication. Range contractions throughout the floodplain may also be linked to reductions in submerged vegetation coverage elsewhere. Changes in water quality and lake hydrology post-Three Gorges Dam may have adversely affected submerged vegetation productivity. Key information needs for the effective implementation of conservation measures for Tundra Swans include: (1) annual surveys of all major wintering sites throughout each winter to establish the importance of different sites during the non-breeding period; (2) more information on swan diets at important sites; and (3) an assessment of adverse effects of water quality and lake water levels post-Three Gorges Dam on submerged vegetation productivity at Poyang Lake and other important sites.

Distribution pattern of finless porpoises at the junction of the Yangtze River and Poyang Lake observed by towed passive acoustic device

2011 ◽  
Vol 130 (4) ◽  
pp. 2460-2460
Author(s):  
Satoko Kimura ◽  
Tomonari Akamatsu ◽  
Songhai Li ◽  
Lijun Dong ◽  
Kexiong Wang ◽  
...  
Keyword(s):  
Distribution Pattern ◽  
Yangtze River ◽  
Poyang Lake ◽  
The Yangtze River ◽  
Acoustic Device ◽  
Passive Acoustic
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