Hydrodynamic investigation of surface hydrological connectivity and its effects on the water quality of seasonal lakes: Insights from a complex floodplain setting (Poyang Lake, China)

Li, Yunliang; Zhang, Qi; Cai, Yongjiu; Tan, Zhiqiang; Wu, Huawu; Liu, Xinggen; Yao, Junqiang

doi:10.1016/j.scitotenv.2019.01.015

Cited by 126 publications

(48 citation statements)

References 67 publications

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“…MIKE 21 is a powerful and popular hydrodynamic modeling system used around the world. The hydrodynamic model MIKE 21 used in this study was recently assembled by Li et al [45] which was successfully applied to study the hydrological regime of Poyang Lake and the associate causes and potential impacts [5,8,37,40,45,[51][52][53][54]. Based on the previous work, the constructed Poyang Lake hydrodynamic model [45] was the preferred application in our study.…”

Section: Floodplain Hydrodynamic Modelmentioning

confidence: 99%

“…Based on the previous work, the constructed Poyang Lake hydrodynamic model [45] was the preferred application in our study. The MIKE 21 model was constructed on a bathymetric map (i.e., DEM) of Poyang Lake obtained in 1998 and updated in 2010 [5,45]. Li et al [45] extended the boundary of the model to include the upstream reaches of the major catchment rivers (Figure 1b).…”

Section: Floodplain Hydrodynamic Modelmentioning

confidence: 99%

“…Evidence accumulated from the research regarding anthropogenic interventions and climate change demonstrates that floodplains are presently more prone to external forces, and they are recognized as globally threatened ecosystems [1,2]. In large floodplain systems, hydrodynamic behaviors have gained considerable attention and worldwide recognition, and they play an important role in controlling the mixing that provides critical insights into the transport of water, ecosystem, dissolved matter, and sediments [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Poyang Lake is the largest freshwater lake in China, and its wetland is also recognized as having a pivotal position in the world with great international importance [5]. The lake is located at the south bank of the middle reaches of the Yangtze River, and it is one of the few lakes that remain naturally connected to the Yangtze River.…”

Section: Introductionmentioning

confidence: 99%

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

2020

Water

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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.

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Section: Floodplain Hydrodynamic Modelmentioning

confidence: 99%

Section: Floodplain Hydrodynamic Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2020

Water

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“…The river loop connection, existing prior to 1965, between the Keelung River and Danshuei River in northern Taiwan, had important effects on the residual transport and the salinities of the rivers [18]. Enhanced hydrological connectivity led to an improved water environment of the seasonal lakes in the Poyang Lake floodplains, China [19]. Greater hydrological connectivity to stream surface water increased inflows of allochthonous nutrients in the Piedmont physiographic province of Virginia [20].…”

mentioning

confidence: 99%

Exploring the Effects of Hydraulic Connectivity Scenarios on the Spatial-Temporal Salinity Changes in Bosten Lake through a Model

Liu

Bao

2019

Water

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Lake water salinization in arid areas is a common problem and should be controlled for the better use of freshwater of lakes and for the protection of the environment around lakes. It is well known that the increasing of hydraulic connectivity improves water quality, but for a lake, understanding how hydraulic connectivity changes its water quality in terms of spatial aspects is of great significance for the protection and utilization of different regions of the lake water body. In this paper, the impacts of three connectivity scenarios on the spatial-temporal salinity changes in Bosten Lake were modeled through the three-dimensional (3D) hydrodynamic model, Environmental Fluid Dynamics Code (EFDC). The constructed Bosten Lake EFDC model was calibrated for water level, temperature, and salinity with acceptable results. As for the Bosten Lake, three connectivity scenarios were selected: (1) the increasing of the discharge water amount into the lake from the Kaidu River, (2) the transferring of 1 million cubic meter freshwater to the southwestern part of the lake (the Huangshuigou region of the lake), and (3) the changing of the outflow position from the southwestern part of the lake (the Kongque river) to the southeastern of the lake (the Caohu region). Through the simulations, we found that the region of the lake mainly influenced by the three scenarios presented here were different, and of the three scenarios, scenario 3 was the best means of controlling the overall lake salinity. On the basis of the salinity distribution results gained from the simulations, decision-makers can choose the ways to mitigate the salinity of the lake according to which region they want to improve the most in terms of economic efficiency and preserve in terms of ecological balance.It is a common problem that water is salinized with time in arid and semi-arid areas [5,6]. In Central Asia, many freshwater lakes have changed to oligosaline or saline lakes due to anthropogenic activities and climate change [7]. Lake Qarun, southwest of Cairo, Egypt, a formerly freshwater lake, has become a saline lake due to agricultural drainage [8]. The water salinity of the Aral Sea and Lake Chad has increased due to river regulation and diversions [9]. In arid and semi-arid regions, lake water salinization has been attributed primarily to high water evaporation rates, low rainfall rates, limited recharge and inflow water diversion for irrigation, among other uses [10][11][12].The impacts of water salinization are manifold, adverse, and have largely irreversible environmental, economic, and social costs [8]. Many studies [13][14][15][16][17] demonstrate that the high salinity in lake water has harmful effects on water quality and the health of people, plants, and animals, hence restricting the utilization of water and damaging the integrity of ecosystems.It is well known that water connectivity is important for controlling water quality and improving ecological environment. The river loop connection, existing prior to 1965, between the Keelung River a...

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Unveiling Phytoplankton Diversity: Taxonomy, Functional Groups, and Environmental Drivers in North China Lakes

Wang,

Huang,

et al. 2024

Ecology and Evolution

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Functional groups (FGs) represent a classification scheme designed to study the ecological adaptations of phytoplankton. However, FG dynamics studies in phytoplankton are often conducted independent of taxonomic studies, so the factors influencing community dynamics have not been sufficiently investigated or compared between the two classification systems. In this study, we compared the intricate relationship between taxonomic and FG compositions in North China lakes and delve into the key environmental drivers shaping phytoplankton community dynamics. This investigation revealed that taxonomic and FG classifications exhibit high qualitative and quantitative similarities in the community structure. Environmental drivers had a stronger influence on the FG structure than taxonomic composition, indicating that the FG classification does not result in the loss of ecological information regarding the community structure, even with the reduced number of grouping units. Indeed, it was evident that FGs contained a larger quantity of ecological information. These conclusions were further verified using lakes in eastern China. Additionally, we found that climatic–geographical factors usually exerted indirect influences, by altering water chemistry, while water chemical factors had more direct and stronger influences. The combined effects of both types of environmental factors had a greater impact on the phytoplankton FG structure than on taxonomic composition. In conclusion, we believe that an in‐depth study of FGs will better focus on the ecological characteristics of phytoplankton, while also avoiding the need for extensive species identification.

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Hydrodynamic investigation of surface hydrological connectivity and its effects on the water quality of seasonal lakes: Insights from a complex floodplain setting (Poyang Lake, China)

Cited by 126 publications

References 67 publications

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

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

Exploring the Effects of Hydraulic Connectivity Scenarios on the Spatial-Temporal Salinity Changes in Bosten Lake through a Model

Unveiling Phytoplankton Diversity: Taxonomy, Functional Groups, and Environmental Drivers in North China Lakes

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