Application of a Linked Hydrodynamic–Groundwater Model for Accurate Groundwater Simulation in Floodplain Areas: A Case Study of Irtysh River, China

The rich biodiversity in the floodplain area is influenced by both floods and groundwater (GW). To protect ecological environment area, it essential to study interaction between GW. objective of this paper propose a coupling strategy hydrodynamic model GW provide an accurate simulation tool for quantifying case conducted middle reaches Irtysh River northwest China. Firstly, two-dimensional based on TELEMAC-2D constructed accurately simulate under wetting drying conditions. Secondly, MODFLOW developed. Finally, proposed achieve efficient integration model. calibration verification results demonstrate high accuracy, with root mean squared error (RMSE) values 0.51 m 0.77 observed calculated levels hydrodynamic–GW coupled water balance indicate that serve as largest recharge source while phreatic evaporation primary discharge item. This represents novel attempt couple research scientific restoration areas considering surface GW, well comprehensive management regulation wetland resources environment.