Paper Information

Journal:   JOURNAL OF AGRICULTURAL SCIENCES   Winter 2004 , Volume 9 , Number 4; Page(s) 51 To 71.
 
Paper: 

COMPARISON OF DIFFERENT SOLUTIONS OF VOLUME BALANCE MODEL IN SURFACE IRRIGATION

 
 
Author(s):  KOUCHAKZADEH M., FATHI P., HOMAEI M.
 
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Abstract: 

The precise prediction of advance phase is crucial for surface irrigation design, evaluation and management. Several models are now available to predict the advance phase. Among those, the so-called "volume balance model" is widely used because of its simplicity and applicability. Different methods are employed to solve the volume balance model, in which the advance phase is predicted with different precision. The objective of this study was to evaluate the existing methods and to select the best approach for designing different surface irrigation systems. Consequently, "the Hall", "the corrected Hall", "the varied surface shape factor", "the varied sub-surface shape factor", and "the ultimate explicit" methods were selected to solve the volume balance equation. A computer program was written in Quick Basic for each of these methods, The data collected by Roth et al. (1974) and Walker et al. (1983) were used to verify and compare the models for border and furrow irrigation, respectively. The collected data were also used as input parameters in the computer programs. The outputs were the rates of the advance time in different lengths of furrow or border (advance phase curve). The results indicated that "the corrected Hall" and"the varied sub-surface shape factor" methods provides the best performance to predict the advance time for border irrigation. The "varied surface shape factor" method, however, provided the best estimation of advance time in the furrow irrigation.

 
Keyword(s): ADVANCE PHASE, BORDER IRRIGATION, FURROW IRRIGATION, SURFACE IRRIGATION, VOLUME BALANCE MODEL
 
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