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水锤剖面图分析求解

山区地形地势起伏较大,管径300球墨铸铁和315pe管分段交替,管中流速也不大,1m/s左右,起点是一级水池+变频泵站与后面两个无负压泵站串联连接,共三台,模拟这3台水泵全部停掉以后看剖面图发现只有小一段负压出现,并且压力也有明显的升高波动,不太会分析剖面图表达的意思,有没有大佬讲解一下?麻烦了