Simulation of Poyang Lake water levels and outflow under historical extreme hydrological scenarios

Simulation of Poyang Lake water levels and outflow under historical extreme hydrological scenarios

Yu, M. (TU Delft Water Resources; Hohai University; Nanjing Hydraulic Research Institute)
Liu, X. (TU Delft Hydraulic Structures and Flood Risk; Southeast University; IHE Delft Institute for Water Education)
Wood, Paul (Loughborough University)
Wei, Li (Hydrology Monitoring Center of Jiangxi Province, Nanchang)
Wang, Guoqing (Nanjing Hydraulic Research Institute)
Zhang, Jianyun (Nanjing Hydraulic Research Institute)
Li, Qiongfang (Hohai University)

2022

Due to an intensification of anthropogenic activities and climate change in recent decades, the hydrological connections and relationships between rivers and lakes have been significantly modified globally. Poyang Lake is one of the largest freshwater lakes globally and is one of the few that remain naturally connected to the Yangtze River. To investigate the full hydrological conditions (extreme high and low discharge) of Poyang Lake outflow under current bathymetric conditions, a large-scale 1D- and 2D-coupled high-resolution hydrodynamic model of the Poyang Lake basin–Yangtze River system was developed. We simulated the outflow and water levels of Poyang Lake under nine different extreme hydrological scenarios with high precision and computational efficiency. We propose (1) a novel partition calibration method to characterize the roughness coefficient of large water bodies in complicated geographical terrain both for wet and dry seasons; (2) a new method for setting initial conditions for hydrodynamic simulation of large water bodies subject to strong hydrological regulation. Results indicated that (1) maximum outflow and water levels will reach 37,200 m³/s and 22.28 m when Poyang Lake basin floodwater coincides with flooding on the Yangtze River; (2) precipitation over the lake has increased outflow but this has had very limited influence on its changing hydrological pattern; (3) the effect of hydrological conditions within the system differs for both the lake outflow and water level. The research provides important reference conditions for the application of the InfoWorks ICM model in future applications and studies of large river–lake systems.

flood and drought
hydrodynamic model
outflow
Poyang Lake
rainfall
Yangtze River

http://resolver.tudelft.nl/uuid:cdeb396c-838a-4369-b921-fb626a2c9dc5

https://doi.org/10.1111/jfr3.12806

1753-318X

Journal of Flood Risk Management, 15 (3)

Institutional Repository

journal article

© 2022 M. Yu, X. Liu, Paul Wood, Li Wei, Guoqing Wang, Jianyun Zhang, Qiongfang Li