Algae control in oligotrophic surface water under the joint effect of nutritional competition and microbial algae-lytic substance

Harmful algal abnormal proliferation presents the most severe threat to the quality of oligotrophic surface water even in source water such as South-to-North Water Diversion Project in China. A novel...

A Study on Comprehensive Evaluation Methods for Coordinated Development of Water Diversion Projects Based on Advanced SWOT Analysis and Coupling Coordination Model

The implementation of water diversion projects will exert different influences on upstream water offering areas and the downstream water receiving areas. In order to effectively promote the coordinated development of the two regions, a comprehensive evaluation system for the coordinated development of water transfer projects has been proposed with the Middle Route of the South-to-North Water Transfer Project as the research object. The system conducts a multidimensional evaluation of social development, economic development, and ecological environmental impact, and builds a comprehensive evaluation index system with fifteen evaluation indexes at three levels, with the indexes weighted through the comprehensive weighting method based on the combination of the G1 method and the entropy weight method. Based on the degree of coordinated development among various systems, the coordinated development of the Middle Route of the South–North Water Transfer Project is graded through a comprehensive evaluation. This method is tested in the decision support system of the Middle Route Construction and Administration Bureau, China. The results show that: (1) The coupling coordination degree value of the middle route of the South-to-North Water Diversion Project is 0.8912, which shows that the regional development of the water transfer project is high coupled coordination. (2) The coordination between the economic system and the ecological environment system is weaker than the coordination between the economic system and the social service system, and the coordination between the ecological and social services is the best. Finally, based on an advanced SWOT analysis of the future development of the middle route of the South-to-North Water Diversion Project, effective suggestions for regional development are provided. It provides reference or guidance for the competent authority to manage the water diversion project and the central government to comprehensively evaluate the effectiveness of the water diversion project.

Feasibility analysis of water resources market transaction of water diversion project based on evolutionary game

Water diversion project realize the change of water right ownership by diverting water resources, but most of the water diversion projects are dominated by the government in the operation stage, which can't realize complete market-oriented transaction of resources. In this study, the water source area, project management department and users involved in water resources trading of water diversion project are regarded as stakeholders, and an evolutionary game model is established to analyze the feasibility and restrictive conditions of the free trading of water resources in the water diversion project. The research results show that the three parties can realize the balance and stability of interests (water source area supplies good water, project management department supplies sufficient water, users take water according to the supply), which means that the feasibility of water market transactions. Meanwhile, it also gives clear restrictions on the water price of three parties transaction, project management department buys water price is less than on the premise of lower than + , sells water price is not higher than The free trading of water resources in the water diversion project under the market mechanism is of great significance for clarifying the water rights and reducing the financial pressure of the government.

Prediction of the Long-Term Performance Based on the Seepage-Stress-Damage Coupling Theory: A Case in South-to-North Water Diversion Project in China

The South-to-North Water Diversion Project has been in operation since 2014, directly benefiting more than 79 million people in China. Thus, its service life and long-term performance have gained much attention from scholars. To predict its life and performance, this study used the seepage/stress-damage coupling method. In addition, a seepage/stress-damage coupling theory was proposed and a finite element model of a deep excavated canal in the Xichuan Section of the South-to-North Water Diversion Project was established. The results showed that this canal subsided greatly in the first two years of operation, which can be confirmed by the monitoring data. It is predicted that, after 50 years of normal operation, the canal damage may start and spread from the water level, and reach 37.6%, but such damage will not affect its normal water delivery function. The purpose of this study is to provide guidance for the safe operation of the project.