线性化方法应用于非线性的DI的延髓方程粘性重力流等温派生NITE DI erence数值方法。数值方法可以采用相似的解决方案进行验证。-The linearisation method is applied to the nonlinear diusion equation governing the isothermal of viscous gravity currents to derive a nite dierence numerical scheme. The numerical approach can be validated using similarity solutions.