这是Toro老先生的带干湿界面的精确解，请好好研究-Program name: HW-EXARP File name: hw_exarp.f Purpose: To solve exactly the general Riemann problem for the non-linear one-dimensional shallow water equations for wet and dry bed conditions

利用平均风速、相对湿度、平均气压等要素计算湿球温度-wet bulb temperature calculation