作 者: ;
机构地区: 华南师范大学南海校区学院数学系
出 处: 《数学研究》 1998年第2期122-133,共12页
摘 要: 在部分饱和与部分干的层状多孔介质中,建立了一维渗流问题的数学模型.在自然的条件下,证明了一类退化抛物方程弱解的存在唯一性.揭示了一个重要性质,即当下层介质的孔隙比上层更粗时,层状交界面具有隔水作用.这一作用将会在展状交界面不均匀时导致指状湿峰的出现.同时也说明,较粗孔隙的上层具有防止水分蒸发的作用. A mathematical model of one dimensional filtration problem in partially saturated and dry layered porous media is given and studieThe existence and uniqueness of the weak solutions of a Class of degenerate parabolic equation are proved under natural conditions. It is revealed that the interface between two layered porous media has an impermeable effect when the coarser lower laper is dry.This effect will cause the instability of watting front.