scholarly journals Ecological water level for proposed hydraulic construction locking Lake Poyang based upon wintering waterfowls habitat modelling

2020 ◽  
Vol 32 (5) ◽  
pp. 1519-1528
Author(s):  
CHEN Liangang ◽  
◽  
CHEN Liming ◽  
XU Yifan ◽  
JIA Jianwei ◽  
...  
Keyword(s):  
Water Level ◽  
Habitat Modelling ◽  
Lake Poyang ◽  
Ecological Water Level

scholarly journals New method and application of estimating ecological water level of the Lake Poyang

2015 ◽  
Vol 27 (5) ◽  
pp. 783-790 ◽  
Author(s):  
GAN Feng ◽  
◽  
TANG Lin ◽  
GUO Huaicheng ◽  
GAO Wei
Keyword(s):  
Water Level ◽  
New Method ◽  
Lake Poyang ◽  
Ecological Water Level

scholarly journals Simplified Lake Surface Area Method for the Minimum Ecological Water Level of Lakes and Wetlands

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1056 ◽  
Author(s):  
Songpu Shang ◽  
Songhao Shang
Keyword(s):  
Water Level ◽  
Surface Area ◽  
Lake Level ◽  
Lake Ecosystem ◽  
Lake Surface ◽  
Area Method ◽  
Ecosystem Protection ◽  
Lake Morphology ◽  
Lake Surface Area ◽  
Ecological Water Level

The determination of the rational minimum ecological water level is the base for the protection of ecosystems in shrinking lakes and wetlands. Based on the lake surface area method, a simplified lake surface area method was proposed to define the minimum ecological lake level from the lake level-logarithm of the surface area curve. The curve slope at the minimum ecological lake level is the ratio of the maximum lake storage to the maximum surface area. For most practical cases when the curve cannot be expressed as a simple analytical function, the minimum ecological lake level can be determined numerically using the weighted sum method for an equivalent multi-objective optimization model that balances ecosystem protection and water use. This method requires fewer data of lake morphology and is simple to compute. Therefore, it is more convenient to use this method in the assessment of the ecological lake level. The proposed method was used to determine the minimum ecological water level for one freshwater lake, one saltwater lake, and one wetland in China. The results can be used in the lake ecosystem protection planning and the rational use of water resources in the lake or wetland basins.

Factors influencing water level changes in China’s largest freshwater lake, Poyang Lake, in the past 50 years

2014 ◽  
Vol 39 (7) ◽  
pp. 983-999 ◽  
Author(s):  
Xuchun Ye ◽  
Yunliang Li ◽  
Xianghu Li ◽  
Qi Zhang
Keyword(s):  
Water Level ◽  
Poyang Lake ◽  
Freshwater Lake ◽  
The Past ◽  
Factors Influencing ◽  
Water Level Changes ◽  
Lake Poyang

scholarly journals Modelling the Impacts of Bathymetric Changes on Water Level in China’s Largest Freshwater Lake

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1469 ◽  
Author(s):  
Lingyan Qi ◽  
Jiacong Huang ◽  
Junfeng Gao ◽  
Zhen Cui
Keyword(s):  
Water Level ◽  
Water Resource Management ◽  
Freshwater Lake ◽  
Lake Ecosystem ◽  
Spatial Gradient ◽  
Dramatic Decline ◽  
Hydrodynamic Processes ◽  
Lake Poyang ◽  
The Stability ◽  
Bathymetric Changes

A recent dramatic decline in water level during the dry season in China’s largest freshwater lake (Lake Poyang) significantly influenced water availability and biogeochemical processes. To learn the potential causes of water level decline, this study investigated the hydrodynamic response to bathymetric changes during three typical hydrological years by scenario simulation using Environmental Fluid Dynamics Code (EFDC). The simulation results indicated that bathymetric changes resulted in a water level decrease during a low water level period. Inter-annual variation in the decrease rate implied that water level in typical dry and wet years were influenced more significantly than that in moderate hydrological years. A spatial gradient in the distribution of water level changes was also observed, which was mainly concentrated in the main channel. Water velocities also slowed down, weakly corresponding to the decrease in water level during the low water level period. Overall, bathymetric changes caused by sand mining contributed to water level and velocity variations, influencing the stability and sustainability of the lake ecosystem. This study can potentially enhance our understanding of the hydrodynamic processes in Lake Poyang and support water resource management.

scholarly journals Integrated biomarker responses of the submerged macrophyte Vallisneria spiralis via hydrological processes from Lake Poyang, China

2018 ◽  
Vol 5 (12) ◽  
pp. 180729 ◽  
Author(s):  
Yong Ji ◽  
Zhidong Yao ◽  
Jie Zhang ◽  
Xueru Wang ◽  
Jixiang Luo ◽  
...  
Keyword(s):  
Enzyme Activity ◽  
Light Intensity ◽  
Water Level ◽  
Antioxidant Enzyme ◽  
Enzyme Activities ◽  
Antioxidant Enzyme Activity ◽  
Water Levels ◽  
Antioxidant Enzyme Activities ◽  
Wetland Plant ◽  
Lake Poyang

Vallisneria spiralis , a widely distributed wetland plant, was used to reveal how the light intensity at the top of the plant, plant morphology and antioxidant enzyme activity respond to different hydrologic conditions from Lake Poyang, China. By designing a laboratory experiment simulating historical water levels of low, normal and high wetland plant submersion, this study aimed to elucidate the effects of different levels of flooding on growth and antioxidant enzyme activity for V. spiralis . The results showed that the plant crown light intensity of the treated group and control group (CG) first decreased and then increased along with the seasonal variation of the water level. The maximum and minimum values of the plant crown light intensity were observed in April and July, respectively. Similar to the CG, V. spiralis from the normal and low water level (LWL) groups was measured and had higher plant height growth in the flooding period from May to June, and the entire plant biomass also showed a steady growth trend in the same period. However, the plant growth of the high water level (HWL) group was lower during the whole simulation period, with negative growth in July. Antioxidant enzyme activities changed with the seasonal temperature, and the activity of the CG showed a rising trend. Compared with those of the CG, the antioxidant enzyme activities of the HWL group showed a ‘bell shaped’ trend, which was first significantly induced and then significantly inhibited. In addition, the peroxidase (POD) and catalase (CAT) activities from the LWL group in April were also significantly induced. The integrated biomarker response (IBR) index showed that a comprehensive biological index could well reflect the effects of seasonal water levels in Poyang Lake on the growth of the wetland plant V. spiralis . This study indicated that high flooding levels had the strongest negative effect on the growth and enzyme activity of the submerged plant V. spiralis .

Research On Ecological Water Level Of Open Lakes: a Case Study Of Poyang Lake

2020 ◽  
Author(s):  
Liang Wang ◽  
Zhong Li ◽  
Chang Liu ◽  
Shiyan Wang ◽  
Budong Li ◽  
...  
Keyword(s):  
Water Level ◽  
Poyang Lake ◽  
Ecological Water Level

scholarly journals Landscape pattern changes of Carex and its response to water level in Lake Poyang Wetland

2017 ◽  
Vol 29 (4) ◽  
pp. 870-879
Author(s):  
ZHOU Yunkai ◽  
◽  
BAI Xiuling ◽  
NING Lixin
Keyword(s):  
Water Level ◽  
Landscape Pattern ◽  
Lake Poyang ◽  
Response To Water

Experimental study on the effect of the Three Gorges Project on water level in Lake Poyang

2014 ◽  
Vol 26 (4) ◽  
pp. 522-528 ◽  
Author(s):  
WU Nianhua ◽  
◽  
LUO You ◽  
LIU Tonghuan ◽  
HUANG Zhiwen
Keyword(s):  
Experimental Study ◽  
Water Level ◽  
Three Gorges Project ◽  
Three Gorges ◽  
The Three Gorges ◽  
Lake Poyang ◽  
The Three Gorges Project

Optimal operation of the Three Gorges Reservoir subject to the ecological water level of Dongting Lake

2016 ◽  
Vol 75 (14) ◽  
Author(s):  
Lingquan Dai ◽  
Jingqiao Mao ◽  
Yu Wang ◽  
Huichao Dai ◽  
Peipei Zhang ◽  
...  
Keyword(s):  
Water Level ◽  
Three Gorges Reservoir ◽  
Optimal Operation ◽  
Dongting Lake ◽  
Three Gorges ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Ecological Water Level
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