Journal ArticleDOI
Comparison of solutions of Saint-Venant equations by characteristics and finite difference methods for unsteady flow analysis in open channel
TLDR
In this article, the results of the two methods were compared and this was shown that: 1) these two methods can draw the surface profiles and flow hydrograph as well; 2) the mesh size in finite difference method can be larger than that one; 4) the difference between two methods are increased by increasing the time and distance.Abstract:
The unsteady flow can be analysed by Saint-Venant equations These equations can be solved by characteristics and finite difference methods The Saint-Venant equations are changed into four complete differential equations in characteristics method and these equations are solved by drawing two characteristics lines The Saint-Venant equations are changed into set nonlinear equations and are solved using Preissman scheme in finite difference method This set of equation is changed into linear equation using Newton-Rafson method and can be solved using Sparce method In this research, the results of the two method were compared and this was shown that: 1) these two methods can draw the surface profiles and flow hydrograph as well; 2) the finite difference method is more accurate than that one; 3) the mesh size in finite difference method can be larger than that one; 4) the difference between two methods are increased by increasing the time and distanceread more
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Developing an optimal design model of furrow irrigation based on the minimum cost and maximum irrigation efficiency
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Rouhallah Fatahi Nafchi,Hossein Samadi-Boroujeni,Hamid Raeisi Vanani,Kaveh Ostad-Ali-Askari,Kaveh Ostad-Ali-Askari,Milad Khastar Brojeni,Milad Khastar Brojeni +6 more
TL;DR: In this paper, the authors investigated the initial erosion threshold shear stress, the impact of consolidation and sediment depth were examined by cylindrical settling columns, and the results showed that the concentration of eroded sediments is a function of time for the consolidation of reservoir sediment and bed shear stresses and also observed that the duration of consolidation time is an effective factor on critical erosion shear stressed.
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Investigation on the effect of inclined crest step pool on scouring protection in erodible river beds
Rohallah Fattahi Nafchi,Hamid Raeisi Vanani,Kobra Noori Pashaee,Hosein Samadi Brojeni,Kaveh Ostad-Ali-Askari +4 more
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