Nash-Sutcliffe效率系数经常被用来作为水bai文模型的效率评价指标，du也可以被zhi用在其他模型模拟结果评定。Nash-Sutcliffe效率系数变化范围从dao-∞到1。1值对应于实测值和模拟值的完美匹配；效率为0表明该模型模拟结果等同于实测值的均值系列；而小于零时，实测系列的均值比模拟系列值都要好。(Nash Sutcliffe efficiency coefficient is often used as the efficiency evaluation index of water Bai model)