Abstract:By taking into consideration the human biomechanics and the flood actions on the human body comprehensively, the study divides the human instability in the flood flow into two types, including tumbling type and slipping type. The equations of two types of critical human instability are deduced and the factors influencing on human stability are analyzed. Then, the ordinary differential equations are deduced by taking only one generalized coordinate into consideration with Lagrange method. The numerical solutions are solved by higher Runge Kutta method and the factors influencing on human walking in the flood flow are researched. A comparative study is made of the flood depths, the corresponding flood velocities with its experimental values when human losing their stability and walking in the flood flow normally. The results indicate the conditions of human critical instability and walking ordinarily are determined preferably by the proposed method.
