Modified logarithmic tachoida applied to sediment transport in a river

Bed Sediment Influence on River Flow

“…In the previous paper the analysis of flow in the river in the case of non movable bed and the way of calculation of eddy viscosity coefficient of water at the bottom is given Meyer (1986Meyer ( , 2009aMeyer ( , 2009bMeyer ( , 2009cMeyer ( , 2009d…”

“…-velocity of water at the level; y, p υ -surface water velocity; x, y -the basic system of coordinates (y -vertically upward and x -horizontally). The parameter U appearing in the above equations is defined, by Meyer (2009c)…”

“…eddy viscosity coefficient at the bottom. The problem was investigated by the author in the previous paper Meyer (2009c). From that analysis, relationships come describing: eddy viscosity coefficient of water at the bottom, von Karman constant, the linear measure of bed roughness and Maning roughness coefficient.…”

“…From that analysis, relationships come describing: eddy viscosity coefficient of water at the bottom, von Karman constant, the linear measure of bed roughness and Maning roughness coefficient. All those parameters appear in the modified logarithmic tachoida proposed by the author, Meyer (2009cMeyer ( , 2009d, and they can be used for calculations of river depth depending on river flow. On the other hand there exists a great number of methods for calculation of sediment stream van Rijn (1982); Zanke (2003); Graf (1984); Olsen at all (1995).…”

“…The hydrodynamic equilibrium state in the case of non movable bed requires eddy viscosity coefficient of water at the bottom Meyer (2009cMeyer ( , 2009d. In the case of movable bed when bed sediment stream occurs the mixture of water and solid particles is created.…”