The river ecosystem has the characteristics of the coexistence of clarity and ambiguity. The starting point of eco-friendly reservoir operation is to fully consider the ecological water requirements of the lower reaches of the reservoir, so it also has the characteristics of clarity and vagueness. The fuzzy theory is an excellent tool to realize the quantification of fuzzy concepts. In this paper, the variable set theory (VS) is introduced into the decision-making field of eco-friendly reservoir scheduling scheme optimization. Taking Ertan Hydropower Station as an example, the scheduling scheme optimization is carried out. To verify the effectiveness of the evaluation method, this paper compares and analyzes the evaluation results of the fuzzy set evaluation method and the composite fuzzy matter-element method. The results show that the variable fuzzy set method has the advantages of rigorous theory, a concise model, and simple calculation, and the decision result is reasonable and reliable. This research can provide new ideas for the decision-making research of engineering.

中文翻译：

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基于变量集的生态友好型水库运营方案的决策

河流生态系统具有清晰与模糊并存的特点。生态友好型水库运行的出发点是充分考虑水库下游的生态用水需求，因此也具有清晰和模糊的特点。模糊理论是实现模糊概念量化的极好工具。本文将变量集理论(VS)引入到生态友好型水库调度方案优化决策领域。以二滩水电站为例，进行调度方案优化。为验证评价方法的有效性，本文对模糊集评价法和复合模糊物元法的评价结果​​进行对比分析。结果表明，变量模糊集法具有理论严谨、模型简洁、计算简单、决策结果合理可靠等优点。该研究可为工程决策研究提供新的思路。