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

آب و خاک

Article 4, Volume 28, Issue 4, September 2013, Pages 708-716   

Document Type: Research Article

DOI: 10.22067/jsw.v0i0.26959

Authors

T. Asadollahzadeh^* ; M. Mashal; S. Karimzadgan

University of Tehran

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

References

1- شقاقی م. و مشعل م. 1386. بهبود اندازه گیری هدایت هیدرولیکی اشباع خاک با استفاده از آنالیز های تک عمقی نفوذ سنج گلف. مجله علمی کشاورزی دانشگاه شهید چمران: ISSN 0254-3648

2- Gomez J.A., GiraldezJ.V., and FereresE. 2001. Analysis of infiltration and runoff in an olive orchard under no-till. Soil Sci. Soc. Am. J. 65:291–299. doi:10.2136/sssaj2001.652291x

3- Koorevaar P., MenelikG. and DirksenC. 1983. Elements of soil physics. Elsevier,New York

4- Lancaster J.W. 2000. Multi -scale estimation of effective permeability within the Greenholes Beck catchment. Ph.D. diss. Lancaster University, Lancaster, Lancashire, UK.

5- Muñoz-Carpena R., RegaladoC.M., Álvarez-BenediJ. and BartoliF. 2002. Field evaluation of the new Philip–Dunne permeameter for measuring saturated hydraulic conductivity. Soil Sci. 167:9–24. doi:10.1097/00010694-200201000-00002.

6- Muñoz-Carpena R., RegaladoC.M. and Álvarez-BenediJ. 2001. The Philip– Dunne permeameter: A low-tech/low-cost field saturated hydraulic conductivity device. ASAE Pap. 01-2146. Am. Soc. Agric. Eng., St. Joseph, MI.

7- Philip J.R. 1993. Approximate analysis of falling-head lined borehole permeameter. Water Resour. Res. 29:3763–3768. doi:10.1029/93WR01688

8- Reynolds W.D. 2011. Measuring soil hydraulic properties using cased borehole permeameter: Falling-head analysis. Vadose Zone. J. 10:999–1015. doi:10.2136/vzj2010.0145.

9- Reynolds W.D. and ToppG.C. 2008. Soil water analyses: Principles and parameters.p. 913–939. In M.R. Carter and E.G. Gregorich (ed.) Soil sampling and methods of analysis. 2nd ed. CRC Press, Boca Raton, FL.

10- Reynolds W.D. and ElrickD.E. 2005. Measurement and characterization ofsoil hydraulic properties. p. 197–252. In J. Álvarez-Benedi and R. Muñoz-Carpena (ed.) Soil-water-solute process characterization: An integratedapproach. CRC Press, Boca Raton, FL.

11- Regalado C.M. and Muñoz-CarpenaR. 2004. Estimating the saturated hydraulicconductivity in a spatially variable soil with different permeameters:A stochastic Kozeny–Carman relation. Soil Tillage Res. 77:189–202.doi:10.1016/j.sti ll.2003.12.008

12- Šimůnek J., SejnaM. and Van GenuchtenM.Th. 1999. The HYDRUS-2D software package for simulating two-dimensional movement of water, heat and multiple solutes in variably saturated media. Version 2.0. IGWMCTPS-53. Int. Ground Water Model. Ctr., Colorado School of Mines, GOLDEN