水资源领域内客观地存在着现象的两种不确定性:随机性与模糊性。前者已为大家所接受,并在研究与实际工作中广泛应用概率统计方法处理随机性。但对模糊性,在目前水资源领域中应用模糊集理论与方法的研究成果还不多见。由于为软科学提供新的数学语言和工具的模糊数学,在今天的信 Objectively there are two kinds of uncertainties in the field of water resources: randomness and fuzziness. The former has been accepted by all, and the research and practical work is widely used to deal with randomness probability and statistics methods. However, the research on fuzziness and application of fuzzy set theory and methods in the field of water resources is still rare. Due to the fuzzy mathematics that provides new math languages ​​and tools for soft sciences, today’s letter