Reservoir operating for phytoplankton prevention and control in middle-lower reaches of Han River based on Long Short-Term Memory model
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
Reservoirs improve the spatial and temporal distribution of water resources and create huge socio-economic benefits, while also providing a powerful tool for operating the downstream ecological environment. In the middle and lower reaches of the Han River, water bloom tends to occur in late winter and early spring. Operating through hydrodynamic methods can destroy the growth conditions of phytoplankton and effectively prevent and control phytoplankton growth. However, the formation mechanism of phytoplankton growth is complex and difficult to simulate accurately, which makes the reservoir operating for phytoplankton growth prevention and control inefficient. The problem of missing mechanism can be solved to some extent by machine learning method for phytoplankton simulation.A Long Short-Term Memory-based operating method is suitable for phytoplankton growth prevention and control, which can improve the accuracy of phytoplankton growth simulation and enhance the efficiency of reservoir operating. Taken the water bloom problem in the middle and lower reaches of Han River and Danjiangkou Reservoir as the research object, a phytoplankton growth prevention and control operating model including economic and ecological objective functions; the LSTM model of comprehensive nutritional index and phytoplankton density of water bodies is used to establish ecological objective functions; and the cuckoo optimization algorithm is used to solve the problem.The results show that: (1) the simulated values of comprehensive nutritional index and phytoplankton density simulation model based on LSTM model are significantly correlated with the measured values at 0.01 level, and the phytoplankton density simulation effect is good; (2) compared with the conventional operating, the proposed phytoplankton prevention and control operating scheme can increase the multi-year average water supply by 0.45%, the multi-year average power generation by 1.06%, and the average phytoplankton density is reduced by 1.57%, which further enhances the comprehensive benefits of Danjiangkou Reservoir operating while effectively controlling phytoplankton in the middle and lower reaches of Han River.The non-inferior solution is obtained from the operating chart of Danjiangkou Reservoir for phytoplankton growth prevention and control. The operating chart contains the flood limit line, normal storage level line, first reduced water supply line, second reduced water supply line, restricted water supply line and dead water level line, and the reservoir operating according to this chart can effectively prevent and control the phytoplankton growth in the middle and lower reaches of Han River. The research results can provide technical support for the prevention and control of river phytoplankton.
Keywords:
Project Supported:
Clc Number:
Mobile website
® 2024 All Rights Reserved
冀公网安备13010502002656号
冀公网安备13010502002656号