Document Type : Research Paper

Author

University of Baghdad - college of science.

10.37652/juaps.2011.15422

Abstract

A seismic refraction investigation was carried out at Al-Aziziyah area for delineating water table and determining the velocity of different layers, as well as locating the contamination zones in under ground water which are resulted from agricultural activities. Nineteen seismic profiles were carried out in this study using ABEM TERRALOC seismic system. The length of each profile ranged from (33-115) m. with normal and reverse shooting. The recorded field data interpreted by delay time method using time distance curve as well as plus-minus method, mean-minus time method, ABC method and generalized reciprocal method. The velocities of the first layer range from (252-404) m/sec. and its average is (295.53) m/sec. while the velocities of the second layer ranges from (1335-1666) m/sec. and its average is (1494.21) m/sec. the velocities show no significant difference after interpreting by different methods. In this study the second layer represents the water table in the area with the depths range from (2.2- 5.5) m. Finally the contour map was drawn for the water table of the ground water, as well as a map differentiating the contaminated from non-contaminated zones.

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     1. Greenhalgh,S,A., and Whitely ,R,J.,(1997). Effective application of the seismic refraction method to high way engineering projects .Australian Road Research. Vol.7:No.1: P. 3-20.
     2. Khorshid, S.Z. (1994). Geotechnical evaluation of Adhaim dam area by using geophysical method. Unpublished Ph.D. thesis. Dept. of  geology, Univ. of Baghdad, 183P  (in Arabic).
     3. Khorshid, S.Z. (1984). An investigation of refracted P and S waves in sediments. Unpublished M. Sc. thesis. Dept. of geology, Univ. of Baghdad, 177P (in Arabic).
     4. Ishaq, A.S. (1998). Delineation of shallow geological structures and water table depth in El-Hawija area by using seismic refraction method. Unpublished M.Sc. thesis. Dept. of geology, Univ. of Baghdad, 115P (in Arabic).
     5. Khorshid, S.Z., Al-Khesan, E.H. and Al-Khashan, A. Z. (2006). Basrah Journal of science.Vol.24:No.2: P 27-37.
     6. Safa Al-din, T., Hijab, B. R., Khorshid, S.Z. and Hassan, N.A. (2004). Shear wave velocities and elasto-dynamic properties of soil  at Basrah children hospital. Unpublished report. Scientific consulting Bureau, College of Science, University of Baghdad.   
     7. Alsinawi, S.A., Khorshid, S.Z., Hamdi, F.A.I. (1990). Application of compressional and shear wave velocities in solving geotechnical problems associated with gypsiferous sediments in central Iraq. Iraqi J. Science. Vol.31:No.31: P.590-610.  
     8. Al-Rawi, F.R., Ishaq, A.S., Khorshid., S.Z. (2002).Delineation of shallow geologic structures and depth of water table in Al-Hawija area by using seismic refraction method. Faculty of Science Bulletin. Sana'a  University. Vol.15:No.1:P.950110.
     9. Telford, W.M., Geldart, L.P., Sheriff, R.E. (1990). Applied Geophysics. Cambridge University Press. 2nd edition. Transferred to digital printing (2004). 770P.   
     10. Dobrin, M.B. (1976). Introduction to Geophysical Prospecting. 3rd edition. McGraw Hill Pub.Co. New York.630P.  
     11. Sharma, P.V. (1986). Geophysical Methods in Geology. 2nd edition. Elsevier New York. 440P.
     12. Milsom, J. (2003). Field Geophysics. John Wiley and Sons Ltd. 232P.
     13. Dugiud, J.O. (1968). Refraction determination of water table depth and  alluvium thickness. Geophysics. Vol.33:No.3: P.481-488. 
     14. Mota, L. (1954). Determination of dips and depths of geological layers by seismic refraction method. Geophysics. Vol.19: P.242-252.
     15. Press, F. (1966). Seismic velocities. Hand book of physical constants. Geol. Soc. Am. Inc. Medr. 97:P.195-218.
     16. Hagedooren, J.G. (1959). The plus minus method of interpreting seismic refraction sections. Geophysical prospecting. Vol.7: P.158-182
     17. Van Overmeeran, R.A. (1987). The plus minus method for rapid field processing by portable computer of seismic refraction data in multi-layer ground water studies. First Break. Vol.5:No.3: P.83-94.
     18. Sjogren, B. (1984).Shallow refraction seismics. Chapman and Hall. London. 270P.
     19. Palmer, D. (1981). An introduction to the generalized reciprocal method of seismic refraction interpretation. Geophysics. Vol. 46:No.11:P.1508-1518.
     20. Kilty, T.K., Norris, R., Maclomore, W.R., Hennon, K.P. and Euge, K. (1986). Seismic refraction at Horse Dam: An application of the generalized reciprocal method. Geophysics. Vol.51:No.2:P.266-275.
     21. Hartherly, P.J. and Neville, M.J. (1986).Experience with generalized reciprocal method of seismic refraction interpretation for shallow engineering site investigation. Geophysics. Vol.51:No.2:P.255-265.
     22.Wright, C. (1996). A note on the computation of the offset distance X Y in the generalized reciprocal method of seismic refraction interpretation. Geophysical prospecting. Vol.44:P.41-53.  
     23. Lankistone, R.W. (1989). The seismic refraction method: Available tool for mapping shallow target into the 1990's.Geophysics.Vol.54:No.12:P,1535-1542. 
     24. Safa Al-din, T., Hijab, B.R., Tamr Agha, M.Y. (2002). Geological and geotechnical investigation of the Ejbail dam site. Scientific Consultant Bureau. College of  Science. University of Baghdad. Vol.3:Part.1:357P. Unpublished report.