The two mathematical models for earth dam break, a gradual dam break model due to overtopping and an instantaneous dam break model under some unknown urgent reasons, are set up.

• 针对土坝的溃坝失事,建立了逐渐溃坝和瞬时溃坝两种数学模型,在论述它们各自的机理后,结合实例验证其实用性,并对其各自特点分别加以分析和比较,从而为防汛部门的防洪预报提供科学依据