The aim of this study was to obtain the theoretical dependences to determine the time and distance of displacement of solid rock debris as a part of mudflow in mountain and piedmont areas. Stormflows that can easily move coarse waste of various shapes and sizes, often form mudflow that violates the ecological balance. For developing the strategies to control this phenomenon it is important to solve the problem of predicting the formation of mudflows. To achieve this goal the authors performed analysis of justifying calculations by applying the theoretical dependences of classic mechanics on the basis of known Lagrange, Euler, Bernoulli equations. To compare the results of calculation two cases of geometrical shape of a solid body: a spherical one and as an arbitory form scrag are considered here. It is found out that the velocity of the center of a spherical shape body(for time = 2.83 sec) will be 2.56 m/s, and the body will move 4.9 m along the inclined slope; in 60sec it will move 153.6 m; and in 1 hour – 9216.0 m. Any arbitrary shape body velocity (closer to natural, original forms), acquired by them on the initial section of the route after start from place will reach 2.47 m/s (in 0.14 s) and the way will be 0,34 m. In running time of 60sec the body (stone) will go 158.2 m, and in 1 hour (under favorable moving conditions) the highlighted part of mudflow moves 9492.0 m. The calculations showed that the theoretical dependence obtained (2'), (5), (7) and (12) are fully applicable to the time, distance and speed determination of the mudflow that allows avoiding significant damage and possible casualties for the estimated time.
Keywords: mountain-piedmont zone, velocity, storm and mudflows, sediment, scrag.
