Seasonal Water Exchanges between China’s Poyang Lake and Its Saucer-Shaped Depressions on River Deltas

Wu, Guojun; Liu, Yuanbo

doi:10.3390/w9110884

Cited by 17 publications

(4 citation statements)

References 32 publications

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“…During periods of low water, seasonal lakes recharge the river or the main lake through groundwater because of its lower water level. These results were observed in the field (Cullmann et al, 2006;Wu & Liu, 2017).…”

Section: Groundwater Flow Fieldsupporting

confidence: 67%

Effects of Periodic Fluctuation of Water Level on Solute Transport in Seasonal Lakes in Poyang Floodplain System

Chen,

Zhang,

Jin

et al. 2023

Water Resources Research

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Seasonal lakes appear in floodplain systems due to the seasonal variation of water level of rivers or main lakes and play an important ecological function. Previous studies have focused on exchange flux between the surface water and groundwater in seasonal lakes, but the process of solute transport at the sediment‐water interface under the effect of seasonal water level fluctuations remains unclear. In this study, laboratory flume experiments and numerical simulations were conducted to investigate non‐reactive solute transport and exchange in a seasonal lake under effects of hydrological connectivity, water level amplitude, sediment permeability and solute source. The results show that the recharge pattern between seasonal lakes and rivers or main lakes is determined by the seasonal water level. The solute transports from the groundwater of seasonal lakes to the main lake during the dry season, while the reverse applies during the wet season. The perennial hydrological isolation increases the concentration in the overlying water and pore water of the seasonal lake by 20.5% and 28.7%, respectively. The solute concentration in the overlying water and pore water of the seasonal lake decreases by 55.2% and 51.5%, respectively, when solute source occurs in the main lake compared with that occurs in the seasonal lake. The amplification of water level amplitudes leads to an increase of 6.46% and 10.55% in the solute concentration drop from the overlying water, respectively. These findings contribute to improving water resource utilization and protecting aquatic ecological environment in floodplain systems.

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Section: Groundwater Flow Fieldsupporting

confidence: 67%

Effects of Periodic Fluctuation of Water Level on Solute Transport in Seasonal Lakes in Poyang Floodplain System

Chen,

Zhang,

Jin

et al. 2023

Water Resources Research

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“…In the months when Landsat data were unavailable, we considered the downscaling method proposed by Wu et al [11]. based on NDWI to obtain a higher resolution from low-resolution data.…”

Section: Water Surface Extraction Methods In Unavailable Months For L...mentioning

confidence: 99%

“…Taking the sub-shaped lakes (Bang Lake and Sha Lake) of Poyang Lake as the research object, Li et al [10] conducted a comprehensive analysis of the transformation relationship and exchange flux of groundwater in the sub-lakes using hydrological, thermodynamic, and hydrodynamic methods. Wu et al [11] used water level observation data to explore the water level change and hydrological exchange process at Poyang Lake and three typical saucer lakes; the study showed that the main lake and the saucer lake show strong seasonal and spatial correlations between water level changes and hydrological exchange processes. Liu et al [12], based on long-term remote sensing images, analyzed the spatio-temporal variation characteristics of seasonal lakes and their influencing factors and ecological effects.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Spatial and Temporal Variation in Water Coverage in the Sub-Lakes of Poyang Lake Based on Multi-Source Remote Sensing

Wang

Xie

et al. 2023

Remote Sensing

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As the largest freshwater lake in China, Poyang Lake is an internationally important wetland and the largest migratory bird habitat in Asia. Many sub-lakes distributed in the lake basin are seasonal lakes, which have a significant impact on hydro-ecological processes and are susceptible to various changes. In this study, using multi-source remote sensing data, a continuous time-series construction method of water coverage suitable in Poyang Lake was developed. That method combined the downscaling of the MNDWI (modified normalized difference water index) with the ISODATA (iterative self-organizing data analysis technique algorithm), and its accuracy can be up to 97% in the months when Landsat 8 is available or 87% when it is unavailable. Based on that method, the increasing variation in water coverage was observed in the sub-lakes of Poyang Lake during 2013–2020 to be within a range of 200–690 km2 normally. The center of the sub-lakes always remained inundated (>80% inundation frequency), while the surrounding areas were probably kept dry for seven months (except for June to September). The dominant influencing factors of water coverage variations were different in different hydrological periods (wet season and dry–wet season: discharge; dry season: temperature and wind speed; wet–dry season: temperature and precipitation). In addition, “returning farmland to lakes” affected the increase in the water area in the sub-lakes. This study is helpful for the management of water resources and the protection of migratory birds in the Poyang Lake region.

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“…Hu et al, 2015). All of these shallow depressions have a saucer-shaped profile, and the maximum water depth is usually less than 2 m (Wu & Liu, 2017). They play an important role in flood mitigation storage and biodiversity protection (Z.…”

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confidence: 99%

Assessing surface water–groundwater interactions in a complex river‐floodplain wetland‐isolated lake system

Zhang

et al. 2018

River Research & Apps

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Floodplain systems are most often hydrologically complex settings characterized by highly variable surface water–groundwater interactions that are subjected to wide‐ranging wetting and drying over seasonal timeframes. This study used field methods, statistical analysis, and the Darcy's law approach to explore surface water–groundwater dynamics, interactions, and fluxes in a geographically complex river‐floodplain wetland‐isolated lake system (Poyang Lake, China). The floodplain system of Poyang Lake is affected by strongly seasonal shifts between dry and wet processes that cause marked changes in surface water and groundwater flow regimes. Results indicate that wetland groundwater is more sensitive to variations in river levels than the seasonal isolated lakes. In general, groundwater levels are lower than those of the isolated lakes but slightly higher than river levels. Statistical analysis indicates that the river hydrology plays a more significant role than the isolated lakes in controlling floodplain groundwater dynamics. Overall, the river shows gaining conditions and occasionally losing conditions with highly variable Darcy fluxes of up to +0.4 and −0.2 m/day, respectively, whereas the isolated lakes are more likely to show slightly losing conditions (less than −0.1 m/day). Although seasonal flux rates range from 7.5 to 48.2 m/day for surface water–groundwater interactions in the floodplain, the flux rates for river–groundwater interactions were around four to seven times higher than that of the isolated lake–groundwater interactions. The outcomes of this study have important implications for improving the understanding of the water resources, water quality, and ecosystem functioning for both the river and the lake.

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Seasonal Water Exchanges between China’s Poyang Lake and Its Saucer-Shaped Depressions on River Deltas

Cited by 17 publications

References 32 publications

Effects of Periodic Fluctuation of Water Level on Solute Transport in Seasonal Lakes in Poyang Floodplain System

Effects of Periodic Fluctuation of Water Level on Solute Transport in Seasonal Lakes in Poyang Floodplain System

Analysis of Spatial and Temporal Variation in Water Coverage in the Sub-Lakes of Poyang Lake Based on Multi-Source Remote Sensing

Assessing surface water–groundwater interactions in a complex river‐floodplain wetland‐isolated lake system

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