本文讨论了河口的定义、范围以及盐淡水混合的类型、程度和强度等问题,认为盐淡水混合状态(程度)和盐淡水混合作用(强度)是两个不同的概念,不能混为一谈。通常所说的高度分层型河口混合程度不好并非一定意味着盐淡水混合作用就弱,充分混合型河口也非盐淡水混合作用就很强。 This paper discusses the definition of the estuary, its scope, and the type, extent and intensity of salt-water mixing. It is concluded that the mixed state (degree) of salt and freshwater and salt-freshwater mixing (intensity) are two different concepts that can not be confused. The so-called highly stratified estuary mixing is not good does not necessarily mean that salt and fresh water mixing is weak, fully mixed estuary also non-salt freshwater mixing is very strong.