Paper Information

Journal:   NEW FINDINGS IN AGRICULTURE   SPRING 2009 , Volume 3 , Number 3 (11); Page(s) 223 To 232.
 
Paper: 

IRRIGATION WATER RESOURCES PLANNING WITH FREQUENCY ANALYSIS OF OPTIMAL CONSUMPTION WATER

 
 
Author(s):  AKBARI NODEHI D.*
 
* ISLAMIC AZAD UNIVERSITY, GHAEMSHAHR BRANCH, IRAN
 
Abstract: 

This research was done to study the effect of seasonal rainfall on optimization of irrigation water. The study was carried out on cotton crop in east of Mazandaran province. Optimal amounts of water consumption were evaluated for water resources and land limitations conditions. By influencing of rainfall amount on production function, optimized relations of consumed water in limitation of land and water condition were modified. Results showed that modified equation was depending on rainfall. The proposed equation was extended for the next years, with the existing data a relationship was established between the amount of optimum irrigation water and growing season rainfall. Results of calculations shows that, increasing of the growing season rainfall (R) in production function, another production function with different coefficient will be obtained.  Based on this modified equation, the values of Ww for different years decreased nonlinearly with seasonal rainfall increase. By applying seasonal rainfall in optimal amounts of water and its effect on these factors, available water resources can be saved. These savings will increase the cultivation area. By frequency analysis with different return period, the optimum water requirements were obtained. By use of frequency analysis, it can be concluded that, if occurrence probability of growing season rainfall be 80%, the value of Ww for cotton crop should be 180 mm in this area. Thus, with this occurrence probability and available water resources, the crop cultivation area can be estimated.

 
Keyword(s): RAIN, THE GROWING SEASON, COTTON, OPTIMIZING WATER USE, MAZANDARAN PROVINCE
 
References: 
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