This paper introduces Markov model and takes a reservoir as an example to assess the water environment security. The result shows that the water environment security was worsening in the last ten year, some measures should be taken to cope with this problem.%论述了马尔科夫模型的原理,并以某水库流域为例,进行水环境安全评价,结果表明,该水库近10年水环境安全总体是下降的,需要采取一定的措施进行防治.
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