y level meaning in English

y型水准仪
y形水准仪
回转水准仪, y式水准仪

A one - dimensional oceanic mixed layer model with the m - y level - 2 . 5 turbulence closure schemes is employed . the rate of energy loss by breaking waves is estimated by parameterization and incorporated into the model as a source of turbulence kinetic energy ( tke ) by modifying the existing surface boundary condition of tke equation . the velocity field and turbulence energy budget are calculated under different forcing conditions ( the results given below are for a wind speed of 20 m / s . )
采用一维2 . 5阶湍封闭混合层模式，根据参数化方法对波浪破碎导致的能量耗散率进行了估计，通过改变湍动能方程的上边界条件引入波浪破碎对湍动能生成的影响，计算了不同风应力强迫下的混合层流场结构和湍能量收支(下述给出的结果是取风速为20m s得到的) 。