scholarly journals On the Hydrodynamic Behavior of the Changed River–Lake Relationship in a Large Floodplain System, Poyang Lake (China)

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 626
Author(s):  
Mengfan Li ◽  
Yunliang Li
Keyword(s):  
Water Level ◽  
Poyang Lake ◽  
Hydrological Regime ◽  
Wetting And Drying ◽  
Lake Water Level ◽  
Inundation Area ◽  
Floodplain Inundation ◽  
Flooding And Drying ◽  
Inundation Duration ◽  
Hydrodynamic Behaviors

Poyang lake floodplains are hydrologically complex and dynamic systems which exhibit dramatic intra-annual wetting and drying. The flow regime of the Yangtze River was previously known to play an important role in affecting Poyang Lake and its extremely productive floodplains (river–lake relationship). The recent severe declines and recessions in the lake are closely linked to the changed river–lake relationship, resulting in significant hydrological, ecological, and economic problems. This study aims to examine the spatiotemporal heterogeneity of the floodplain hydrodynamic behaviors with respect to impacts of the changed river–lake relationship, characterized by the lake water level, inundation area, and inundation duration based on a floodplain hydrodynamic model of Poyang Lake, and to further quantify the severity of dryness recently endured since 2000. Simulation results show that, in general, the current modified river–lake relationship is more likely to affect the hydrological seasonality of the floodplain system since 2000, relative to the flooding and drying cycles during past decades (1953–2000). The present hydrodynamic behaviors suffered significant change due to the greatest interference from the altered river–lake relationship, particularly for the falling period in October. On average, the floodplain water level and inundation duration decreased by 6 m and 12 days during October, respectively. Additionally, the highest monthly shrinkage rate in floodplain inundation shifted from the period of October–November to September–October, with the mean inundation area decreasing by around 50%, demonstrating an advanced and prolonged dry condition. The spatial responses of the hydrodynamics in the low-slope floodplains are most likely to be affected by the dynamic river–lake relationship, as expected. This study assessed the effects of the altered river–lake relationship on the hydrological regime of the Poyang Lake floodplains in terms of spatiotemporal distributions and changing processes for the periodic inundated behavior, which can support the relevant study of the subsequent ecological effects on the wetlands.

Effect of Three Gorges Reservoir on River-Connected Lakes in Central Yangtze River

2013 ◽  
Vol 726-731 ◽  
pp. 1305-1308
Author(s):  
L.Q. Dai ◽  
P.P. Zhang ◽  
J.Q. Mao ◽  
H.C. Dai
Keyword(s):  
Water Level ◽  
Yangtze River ◽  
Poyang Lake ◽  
Storage Period ◽  
Hydrological Regime ◽  
Water Release ◽  
Lake Water Level ◽  
Level Data ◽  
Before And After ◽  
Average Water

As a very critical indicator of the health of the lake, water level of the river-connected lakes is influenced by both watershed inflows and the mainstream. Lakes connected to the Yangtze River has showed big differences since the impoundment of the TGR in 2003, as the hydrological regime in central Yangtze River has changed a lot. In order to grasp the effect of the TGR on the river-connected lakes, based on the water level data of four typical stations in Poyang Lake during the water release operation and storage period before and after the impoundment, the variation of water level is compared and discussed. It is shown that water level of Poyang Lake has undergone changes. In the water release operation stage, the average water level is higher, but in the storage period from late September to October, the average water level of the lake lower than before. In addition, it is pointed out that the extent is gradually reduced from north to south, as the max influence water level is about 1.5 meters and the average influence water level is about 0.6 meters in Hukou station. However, considering the time since the dam n period has not been long, the reservoir effect still needs to be further assessed based on long-term monitoring.

scholarly journals Evidences of hydraulic relationships between groundwater and lake water across the large floodplain wetland of Poyang Lake, China

2017 ◽  
Vol 18 (2) ◽  
pp. 698-712 ◽  
Author(s):  
Yunliang Li ◽  
Jing Yao ◽  
Guizhang Zhao ◽  
Qi Zhang
Keyword(s):  
Water Level ◽  
Lake Water ◽  
Poyang Lake ◽  
Spatial And Temporal Variability ◽  
Floodplain Wetland ◽  
Lake Water Level ◽  
Groundwater Dynamics ◽  
Isotope Evidence ◽  
To Receive ◽  
Poyang Lake Wetland

Abstract Hydraulic relationship between wetlands and lakes has become an important topic for the scientific and decision-making communities. Poyang Lake, an open freshwater lake in China, and the extensive floodplain wetland surrounding the lake, plays an important role in protecting the biodiversity of this internationally recognized wetland system. This paper is the first field-based study into an investigation of the groundwater dynamics in the floodplain wetland and the associated hydraulic relationship with the lake using hydrological, hydrochemical and stable isotope evidence, as exemplified by Poyang Lake wetland. Results show that groundwater stores within the floodplain wetland exhibit spatial and temporal variability in terms of the magnitudes of groundwater level variations. Floodplain groundwater fluctuations largely reflect patterns of the precipitation and the lake water level; however, the groundwater dynamics are highly affected by the variations in the lake water level, rather than local precipitation. Floodplain wetland is most likely to receive the lake water during spring and summer and may recharge the lake during periods of low lake water level. Additionally, floodplain groundwater displays similar hydrochemical and environmental isotope signatures to that of the lake at different sampling periods, indicating a close hydraulic relationship between groundwater and the lake throughout the year.

Effect of Three Gorges Dam on Poyang Lake water level at daily scale based on machine learning

2021 ◽  
Vol 31 (11) ◽  
pp. 1598-1614
Author(s):  
Sheng Huang ◽  
Jun Xia ◽  
Sidong Zeng ◽  
Yueling Wang ◽  
Dunxian She
Keyword(s):  
Machine Learning ◽  
Water Level ◽  
Lake Water ◽  
Poyang Lake ◽  
Three Gorges Dam ◽  
Three Gorges ◽  
Lake Water Level ◽  
Daily Scale

scholarly journals Comparison of random forests and other statistical methods for the prediction of lake water level: a case study of the Poyang Lake in China

2016 ◽  
Vol 47 (S1) ◽  
pp. 69-83 ◽  
Author(s):  
Bing Li ◽  
Guishan Yang ◽  
Rongrong Wan ◽  
Xue Dai ◽  
Yanhui Zhang
Keyword(s):  
Water Level ◽  
Random Forests ◽  
Lake Water ◽  
Poyang Lake ◽  
Time Lag ◽  
Water Levels ◽  
Support Vector ◽  
Lake Water Level ◽  
Water Level Variations

Modeling of hydrological time series is essential for sustainable development and management of lake water resources. This study aims to develop an efficient model for forecasting lake water level variations, exemplified by the Poyang Lake (China) case study. A random forests (RF) model was first applied and compared with artificial neural networks, support vector regression, and a linear model. Three scenarios were adopted to investigate the effect of time lag and previous water levels as model inputs for real-time forecasting. Variable importance was then analyzed to evaluate the influence of each predictor for water level variations. Results indicated that the RF model exhibits the best performance for daily forecasting in terms of root mean square error (RMSE) and coefficient of determination (R2). Moreover, the highest accuracy was achieved using discharge series at 4-day-ahead and the average water level over the previous week as model inputs, with an average RMSE of 0.25 m for five stations within the lake. In addition, the previous water level was the most efficient predictor for water level forecasting, followed by discharge from the Yangtze River. Based on the performance of the soft computing methods, RF can be calibrated to provide information or simulation scenarios for water management and decision-making.

The Study on the Relationship of the Poyang Lake Water Level and the Water Area by Using MODIS Data from 2000 to 2012

2013 ◽  
Vol 726-731 ◽  
pp. 4636-4640 ◽  
Author(s):  
Dan Gao ◽  
Chao Yang Fang
Keyword(s):  
Water Level ◽  
Poyang Lake ◽  
Scientific Basis ◽  
Water Area ◽  
Lake Water Level ◽  
Modis Data ◽  
Level Data ◽  
Water Level Data ◽  
Long Time ◽  
The Relationship

Based on the MODIS data from 2000 to 2012 and the water level data of the Poyang Lake, this paper extracted the water area of the Poyang Lake and got the long time seasonal changing characteristics of the water area and analyzed the relationship between the water level and the water area with the use of the historical water level data of the Poyang Lake. The results provide scientific basis for the building of the Poyang Lake Ecological Economic Zone and the researching of the seasonal change of water resource.

CRITICAL FACTORS OF WATER CONTENT FOR FISH STOCKS IN THE WATER RESERVOIRS OF KAZAKHSTAN

2017 ◽  
pp. 9-18
Author(s):  
Saule Zhangirovna Asylbekova ◽  
Kuanysh Baibulatovich Isbekov ◽  
Evgeniy Vyacheslavovich Kulikov
Keyword(s):  
Water Content ◽  
Water Level ◽  
Water Availability ◽  
Hydrological Regime ◽  
Fishing Effort ◽  
Water Reservoirs ◽  
The Caspian Sea ◽  
Annual Fish ◽  
Commercial Fish ◽  
Fish Stocks

The hydrological regime of water reservoirs in different years has a decisive impact on the abundance of commercial fish stocks and the quality of ichthyocenoses. In this connection in 2015-2016 there was conducted a retrospective analysis and ranking of hydrological regime impact on these factors. The paper gives evaluation of catches and fish stocks under different scenarios of water availability in the main fishing ponds of the Republic of Kazakhstan that give about 80% of the annual fish catch of the country (except the Caspian Sea). There were analyzed 2000 factors of hydrological regime (water level, annual discharge) and 1845 factors of fishing stocks (catches, abundance, fish biomass). The paper determines the critical characteristics of water availability for fish stocks. There have been proposed a number of administrative decisions and actions in case if water content would approach to the critical level. Among them: limitation of fish catches in the following year; widening zones restricted for fishing; intensification of safety measures of the fish young in residual ponds during arid periods; introduction of catch standards for a unit of fishing effort in low-water years, high-water years and years with normal water level in rivers.

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