# Evaluation of Algal Control Measures in Eutrophic Reservoir Based on Aquatic Ecosystem Models
## 4 Conclusions  
This research aims to explore the mechanism of algal growth in the Shanzai Reservoir and establish an algal reproduction growth model to deepen the understanding of the interaction between algal growth and the external environment, encompassing hydrology, meteorology, nutrients, and plankton. This model provides a reliable method to assess the impact of various algae control measures on the overall ecological balance of the reservoir, which is of significant importance. The study evaluated three primary directions of algae control measures--water level, internal source reduction, and ecological stocking. By comparing the effects of these measures on algal biomass and nutrient reduction, future directions in reservoir control research can be derived as follows:  
(1) The implementation of ecological hydraulic construction in the reservoir area, integrating algae control with reservoir water conservancy prevention and control. When balancing the ecological water level factor, it is recommended to consider controlling the water level and reservoir capacity within the scope of the flood limit water level and dead storage capacity in water conservancy. This approach ensures macroscopic control over the hydrodynamics and water environment for algae growth.  
(2) The adoption of a moderate reduction in pollution sources, with a focus on regular early warning monitoring. In the face of the increasing treatment of basin pollution sources, especially after the effective control of major pollution sources in southern reservoirs, the pursuit of the complete elimination of algae is deemed detrimental to the stability of aquatic ecosystems. The simulation model indicates suitable light and temperature conditions as the main driving forces for algal reproduction, recommending incremental reductions in internal and external sources, along with strengthened regular monitoring, to anticipate and prevent extensive algal growth.  
(3) The integration of ecological governance, pollution source reduction, and emergency responses. Combining ecological governance, such as the ecological stocking of fish species like carp and silver carp, with efforts to reduce pollution sources, including internal and external sources in the reservoir, would compensate for the deficiency in nutrient reduction. Over time, this integrated approach will help establish a stable water ecological system in the reservoir, preventing algal outbreaks.  
Conceptualization, Z.Z. and T.L.; methodology, Z.Z.; software, X.Z.; validation, Z.Z., T.L. and Y.L.; formal analysis, Z.Z.; investigation, Z.Z. and Y.L.; resources, Y.L.; data curation, Z.Z. and X.Z., writing--original draft preparation, Z.Z. and X.Z.; writing--review and editing, H.M.; visualization, T.L. and X.Z.; supervision, T.L.; project administration, Z.Z.; funding acquisition, Z.Z. All authors have read and agreed to the published version of the manuscript.  
This research was funded by Sichuan University, State Key Laboratory of Hydraulics and Mountain River Engineering (Grant No. SKHL2322), Environmental Protection Technology Plan Project of Fujian (Grant No. 2021R015), Science and Technology Projects of Shanghai Investigation, Design & Research Institute Co., Ltd. (2023 SD(81)-001).  
The data presented in this study are available on request from the corresponding author.  
The authors would like to give our sincerest thanks to those who participated in the data processing and manuscript revisions.  
Author [PERSON] was employed by the Shanghai Investigation, Design & Research Institute Co., Ltd. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. The authors declare that this study received funding from Shanghai Investigation, Design & Research Institute Co., Ltd. The funder was not involved in the study design, collection, analysis, interpretation of data, the writing of this article or the decision to submit it for publication.