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Paper Information

Journal:   IRANIAN JOURNAL OF WATER RESEARCH IN AGRICULTURE (FORMERLY SOIL AND WATER SCIENCES)   2012 , Volume 26 , Number 3; Page(s) 251 To 261.
 
Paper: 

APPOINTMENT OF WELL SHAPE FACTOR IS APPROPRIATE METHOD TO IMPROVE GUELPH PERMEAMETER RESULTS

 
 
Author(s):  KHARAZMI A.*, MASHAL M., ZAREI GH., VARAVIPOUR M.
 
* UNIVERSITY OF TEHRAN, POSTAL CODE: 18319-78517, KERMAN, IRAN
 
Abstract: 

The Guelph Permeameter technique (GP) is one of the proper methods for measuring the saturated hydraulic conductivity (Kfs) above the water table. This study was done by Guelph Permeameter model 2800kl in 20 auger holes at Research Farm of Abourayhan Campus. Soil texture was determined for the Research Farm, using the hydrometer method. Water outlet flow of the permeameter was measured in four phases under constant ponding heads (H) of 5, 10, 15 and 20 ern, respectively. The field saturated hydraulic conductivity (Kfs) and matric flux potential (?m)' based on successful testing and Guelph analysis, were evaluated by different methods. The results indicated that, in heavy soils, increasing submergence depth of I-h relative to HI, is an appropriate solution for reducing the Guelph's two-head analysis failure in soil hydraulic conductivity estimation. In this study, well shape factor (C) was also calculated by five different methods. Later, the effect of the calculated C factor by various methods was studied in Guelph's two-head analysis. The results showed that using unsaturated effect in the calculations lowers the possibility of obtaining negative values of Kfs and ?m in Xiang Solution. Also, there was a very high correlation between Guelph successful two-head analysis when Xiang and Numeral Solutions were used for calculating C factor (r=0.98).

 
Keyword(s): KEY WORDS: HEAVY TEXTURED SOIL, WELL SHAPE FACTOR, FIELD SATURATED HYDRAULIC CONDUCTIVITY
 
References: 
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