Investigating the Precision of Hydraulic Conductivity and Sorptive Number Estimation in Cased Boreholes by Reynolds Analysis: The Cased of Pakdasht Region

Document Type : Research Article

Authors

• T. Asadollahzadeh
• M. Mashal
• S. Karimzadgan

University of Tehran

10.22067/jsw.v0i0.26959

Abstract

Saturated hydraulic conductivity (Kfs) and sorptive number are the most important hydraulic characteristics effective on soil process. Cased boreholes falling-head permeameter (Philip method) is the one of hydraulic conductivity measurement borehole method. The analysis borehole cased falling-head in unsaturated area promoted and investigated .This method has been investigated by HYDRUS- 2D simulator but in this study is not use experimental data. The purpose of this study precision investigation and determine Reynolds method accuracy by experimental data. Thirty boreholes has been prepared, 12 boreholes with 4 different length and 4 centimeters diameter, 9 boreholes with 3 different length and diameters of 6 and 8 centimeters (3 replications done for each length). A program was written by FORTRAN language for solving the equations presented by Reynolds. Shaghaghi et al determine soil hydraulic conductivity by Guelph method in mentioned area. The results gained by FORTRAN program compared by Shaghaghi et al results. Results showed that the best data drawdown zone for determining Kfs and α* is lower range of data. Considering studies is shown that diameter and length of cased boreholes are not effective on investigation and every length and diameter can be used for solving Reynolds equation. Also the results show that the best gravity factor for precision of estimation is obtained in zero value.

Keywords

• Saturated Hydraulic Conductivity
• Sorpitve numbers
• Cased borehole
• Drawdown

20.1001.1.20084757.1393.28.4.6.8

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