Evaluation of Predictive Equations for Local Pier Scour in Cohesive Soils
Engineering and Technology Journal,
2019, Volume 37, Issue 12A, Pages 584-591
AbstractWavelet analysis has become a powerful tool for denoising images. It represents a new way to achieve better noise reduction and increased contrast. Here, experimentally demonstrate the abilities of the discrete wavelet transform with Daubechies basis functions for improving the quality of noisy images. In this research, two methods have been compared to modify the coefficients using a soft and hard threshold to improve the visual fineness of noisy images depending on the Root-Mean-Square error (RMS). The low RMS value and better noise reduction are found in the soft threshold methods based on Daubechies wavelet (db8) for the first image RMS=0.101 and the second example RMS=0.109.
B. W. Melville, The physics of local scour at bridge piers. In Proceedings 4th International Conference on Scour and Erosion (ICSE-4). Tokyo, Japan, (2008) 28-40.
 A.S. Lodhi, R.K. Jain, and P.K. Sharma. Influence of Cohesion on Scour Around Submerged Dike Founded in Clay–sand–gravel Mixtures. ISH Journal of Hydraulic Engineering 22, (2015) 70–87.
 U. C Kothyari, and R. K. Jain, Influence of cohesion on the incipient motion condition of sediment mixtures. Water resources research 44,(2008).
 R. K. Jain, and U. C. Kothyari, Cohesion influences erosion and bedload transport. Water resources research 45, (2009).
 J-L. Briaud, Pier and contraction scour in cohesive soils. 516. Transportation Research Board, (2004).
 M. M. Hosny, Experimental study of local scour around circular bridge piers in cohesive soils. Ph.D. thesis, Civil Engineering Dept., Colorado State Univ., Fort Collins, CO, 177. (1995).
 Gudavalli, R., F. Ting, J. L. Briaud, H. C. Chen, S. Perugu, and G. Wei. Flume tests to study scour rate of cohesive soils. Res. Rep. Prepared for Texas Dept. of Transp (1997).
 J. L. Briaud, Francis CK Ting, H. C. Chen, Rao Gudavalli, Suresh Perugu, and Gengsheng Wei. SRICOS: Prediction of scour rate in cohesive soils at bridge piers. Journal of Geotechnical and Geoenvironmental Engineering 125, (1999) 237-246.
 F.C. Ting, J.L. Briaud, H.C. Chen, R. Gudavalli, S. Perugu and G. Wei, Flume tests for scour in clay at circular piers, Journal of hydraulic engineering, 127(11), (2001) 969-978.
 Y. Li, Bridge pier scour and contraction scour in cohesive soils on the basis of flume tests.Ph. D. Dissertation, Texas A&M University, College Station, TX. USA. (2002).
 K. T. Kho, E. Valentine and S. Glendinning, An experimental study of local scour around circular bridge piers in cohesive soils, 2nd ICSE Singapore, (2004).
 K. Debnath and S. Chaudhuri, Bridge pier scour in clay-sand mixed sediments at near-threshold velocity for sand, J. Hydraul. Eng. 136 (2010) 597-609.
 K. Debnath and S. Chaudhuri, Laboratory experiments on local scour around cylinder for clay and clay–sand mixed beds,J. Eng. Geo. 111(1-4) (2010) 51-61.
 K. Debnath and S. Chaudhuri, Local scour around non-circular piers in clay–sand mixed cohesive sediment beds, J. Eng. Geo., 151, (2012) 1-14.
 O. Link, K. Klischies, G. Montalva and S. Dey, Effects of bed compaction on scour at piers in sand-clay mixtures, Journal of Hydraulic Engineering, 139(9) (2013)1013-9.
 U. C. Kothyari, A. Kumar and R. K. Jain, Influence of cohesion on riverbed scour in the wake region of piers, Journal of Hydraulic Engineering, 140(1) (2013)1-3.
 M. Najafzadeh and G. A. Barani, Experimental study of local scour around a vertical pier in cohesive soils, Scientia Iranica, Transaction A, Civil Engineering, 21(2) (2014) 241.
 J. L. Briaud, Scour depth at bridges: Method including soil properties. I: Maximum scour depth prediction, J. Geo. and Geoen. Eng., 141(2) (2014), 04014104.
 M. Muzzammil, J. Alama, M. Danish, Scour prediction at bridge piers in cohesive bed using gene expression programming, Aquatic Procedia, 4 (2015)789-96.
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