Mountain-river usually shows the steep slopes bed and consists of a sand-gravel mixture with a wide range of grain size, and also is locally crooked. In the present study, the calculations of three dimensional turbulent flow, sediment discharge with sand-gravel mixture and bed variation in the locally crooked river in mountain region, were conducted by means of standard k-e model, bed load function and continuity equation of sand, respectively. Then, the suitable design of riprap bed protection with natural stones is considered from the result of the turbulence calculation and estimating the shear stress on the bed.
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