Numerical Modelling of a Dam-Regulated River Network for Balancing Water Supply and Ecological Flow Downstream

Dam operation is regarded as an effective way to increase water, food, and energy security for society. However, with the increasing water demand frequent extreme droughts, numerous rivers worldwide go through periods of scarcity ecosystem deterioration varying degrees. Balancing supply ecological flow dam-regulated river network essential in context restoration. In this study, we proposed a hydrodynamic quality model balancing using Environmental Fluid Dynamics Code (EFDC). A section Jinjiang watershed located southwestern China was chosen study area. Firstly, calibrated validated. By comparing simulated values measured values, statistical analysis results showed that relative root mean-squared error (RRMSE) level, COD NH3-N were 5.5–8.1%, 23.6% 28.4%, respectively, indicating adequate degree agreement between simulation observation. Based on established model, dam schemes under dry hydrologic scenario emergency contamination formulated ensure requirement simultaneously. For scenario, could be satisfied operation. regional requirements cannot met The only plays role controlling scope pollution. This expected provide scientific support management downstream protection.