Paper Information

Journal:   JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)   MARCH-APRIL 2012 , Volume 26 , Number 1; Page(s) 150 To 161.
 
Paper: 

MATHEMATICAL MODEL TO SIMULATE UNSTEADY FLOW IN IRRIGATION NETWORKS WITH INTERNAL BOUNDARY CONDITIONS (A CASE STUDY, DARBAND IRRIGATION NETWORK)

 
 
Author(s):  GHOBADIAN R.*, GHOLZARI S.
 
* DEPARTMENT OF WATER ENGINEERING, FACULTY OF AGRICULTURE, RAZI UNIVERSITY, KERMANSHAH
 
Abstract: 

Unsteady flow causes a lot of problems for optimal operational of irrigation networks, hence precise understanding of this flow is necessary. Therefore in this study a computer model has been developed to simulate the unsteady flow produced by delivery and disturbance of water and immediate variation of input discharge in irrigation network. Present model solves partial differential equations of 1-D unsteady flow (Saint- Venant equations) by finite differencing method. Water surface elevation at junction location is calculated implicitly by using of matrix properties and influence line technique. Result of model verification showed developed model simulates water surface profile of positive surge in a trapezoidal channel after sudden closure of end gate. Also developed model for unsteady flow, can simulated steady sate gradually varied flow in a complex loop with a very high accuracy. Additionally there are relatively good agreement between the result of present model with results of ICSS model for simulation of unsteady flow in a single channel (E1R1 channel of Dez network) with different kind of check and intake structures. After model verification, main channel of Darband irrigation network with 14 kilometer length with five secondary channels simulated integrate. Simulation results showed that without any operational performance, 25% sudden reduction of input discharge to main channel reduces discharge of secondary channels between 18.68 to 26.15 percent. Additionally 4.42 hours take place until the effect of unsteady flow fluctuation is disappeared at the location of SC5 channel’s intake.

 
Keyword(s): MATHEMATICAL MODEL, DARBAND IRRIGATION NETWORK, UNSTEADY FLOW SIMULATION, SAINT-VENANT EQUATION
 
References: 
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