Control of Floating Object Directions on Rip Current at Beaches by Using Deflectors

Control of Floating Object Directions on Rip Current at Beaches by Using Deflectors
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© 2023 by IJETT Journal
Volume-71 Issue-1
Year of Publication : 2023
Author : Reda M. A. Hassan, Ibrahim M. A., Mohb M. Iskander, Mostafa M. A.
DOI : 10.14445/22315381/IJETT-V71I1P228

How to Cite?

Reda M. A. Hassan, Ibrahim M. A., Mohb M. Iskander, Mostafa M. A., "Control of Floating Object Directions on Rip Current at Beaches by Using Deflectors," International Journal of Engineering Trends and Technology, vol. 71, no. 1, pp. 317-329, 2023. Crossref, https://doi.org/10.14445/22315381/IJETT-V71I1P228

Abstract
This paper introduces an innovative deflector system to reduce the threats of rip currents. This research aims to assess the proposed tool to deflect the floating subjects caught by rip currents, study the effect of deflector angles on the values and directions of the rip current velocities, and investigate the effect of the deflector distances from the shoreline on rip currents. To achieve the study objectives, experimental works, field measurements, numerical works using the Mike21 model, and mathematical formula derivation of different parameters were carried out. The proposed deflector systems were modeled with different shapes and materials. The experiments were executed first without placing the proposed deflectors as a reference case (A). Then three different types of the proposed deflectors were checked with different water depths (5, 7.5, 10, and 15 cm), different wave frequencies (15, 20, 25, 30, 35, and 40 min-1), and different distances (95, 105, and 125 cm) for the deflector seaward from the shoreline were examined. The rip current velocities have inversed in relation to the distance of the deflector from the shoreline. It is concluded that the deflectors can direct the floating bodies and materials at an angle away from the center of rip currents. This study concludes that the use of deflectors can mitigate drowning effects and increase the preservation of lives. Finally, it is recommended for decision-makers that the proposed deflector should be checked and modified using prototypes in the field conditions; after that, it can be used as a new tool to deflect rip currents to save lives.

Keywords
Rip current, Drowning, Behavior of floating body, Rip current direction, Deflector.

References
[1] Bader A.A, and Shatta M.M., “The Effects of Baltim Detached Breakwaters on the Grain Size Variations and Littoral Sand Drift, Egypt,” Bulletin of the National Institute of Oceanography and Fisheries, A.R.E, 2002
[2] B. Chris Brewster, Richard E. Gould, and Robert W. Brander, “Estimations of Rip Current Rescues and Drowning in the United States,” Natural Hazards and Earth System Sciences, vol. 19, pp. 389–397, 2019.
[3] CAPMAS the Central Agency for Public Mobilization and Statistics Egypt, A Report Issued, 2018.
[4] Shari L.Gallop et al., “Perceptions of Rip Current Myths from the Central South Coast of England,” Ocean & Coastal Management, vol. 119, pp. 14-20, 2016. Crossref, https://doi.org/10.1016/j.ocecoaman.2015.09.010
[5] Robert A. Dalrymple, "Rip Currents and Their Causes," Journal of Coastal Engineering, no. 16, 1978. Crossref, https://doi.org/10.9753/icce.v16.83
[6] Earl Sinchuk, Marquette, and Michael Rosinsky, “Rip Current Sensor and Warning System with Anchor,” United States, Patent Application Publication, 2013.
[7] Elmooty M.A, Taha, S.E, "Rip Current Causes and Precautions," Proceeding of the 9th International Conference, 2012.
[8] Victor A. Gensini, and Walker S. Ashley, "An Examination of Rip Current Fatalities in the United States Natural Hazards, vol. 54, pp. 159-175, 2009. Crossref, https://doi.org/10.1007/s11069-009-9458-0
[9] Kevin A. Haas et al., “Quasi-Three-Dimensional Modeling of Rip Current Systems,” Journal of Geophysical Research, vol. 108, no. C7, 2003. Crossref, https://doi.org/10.1029/2002JC001355
[10] Merrick C Halle, "Rip Current Dynamics and Nearshore Circulation," Doctor Philosophy in Civil Engineering, Faculty of Engineering the University of Delaware, 1999.
[11] Herrington, “Rip Currents: Nearshore Fundamentals,” Ocean Lecture &Educator’s Night, University Corporation for Atmospheric Research, COMET Modules, 2012.
[12] MM Iskander et al., “Overpopulation and Rip Current Mitigation Plan for the Egyptian Coasts,” Ministry of Water Resources & Irrigation Cairo Water Week, CWW2021-Proceeding, Cairo, Egypt, pp. 24-28, 2021.
[13] Kim Nam-hoon et al., “Disaster Prevention and Alarm System for Rip Current,” Introduced Patent no. KR20120069253A in South Korea, 2012.
[14] “Buoy for Detecting Rip Current,” Introduced Patent no. KR101221688B1 in South Korea, 2013.
[15] Jamie MacMahan et al., "An Introduction to Rip Currents Based on Field Observations," Journal of Coastal Research, West Palm Beach, Florida, vol. 27, no. 4, 2011. Crossref, https://doi.org/10.2112/JCOASTRES-D-11-00024.1
[16] Andrew Morang, Joann Mossa, and Robert J. Larson L, "Technologies for Assessing the Geologic and Geomorphic History of Coasts," Chapter 3 Field Data Collection and Observation of Us Army Corps of Engineers, 1993.
[17] Neil John Wallace, Port Ma Quarry, Australia, US Patent No. 9,180.937 B2, 2015.
[18] Reda M. A. Hassan, and Shaymaa E.T. Hassan, “Alleviation of Deadly Hazards of Rip and Circulation Currents Using Near Shore Self Lighting Floating Units,” Journal of American Science, Marsland Press, vol. 15, no. 12, pp. 28-38, 2019.
[19] Svendsen, I. A., K. Haas, and Q. Zhao, “Quasi-3D Nearshore Circulation Model,” Technical Report of Center for Applied Coastal Research, University of Delaware, Newark, DE, p. 15, 2003.
[20] G.Harikrishnan, and Seethalakshmi.S, "Appearance of Midair plasma extenuation of Shock Wave," SSRG International Journal of Applied Physics, vol. 3, no. 1, pp. 18-22, 2016. Crossref, https://doi.org/10.14445/23500301/IJAP-V3I2P104
[21] Taha. S, “The Hydraulic Analysis of the Circulations and Rip Currents,” Thesis of Master in Sc. Hydraulics and Irrigation Engineering, Faculty of Engineering, Alexandria University, 2016.
[22] Thomas J. Lochtefeld, “Method and Apparatus for Controlling Break Points and Reducing Rip Currents in Wave Pools,” Introduced the Patent No. US6738992B2 in the United States, 2004.
[23] T. S. Hedges, “Combinations of Waves and Currents: An Introduction,” Proceedings of the Institution of Civil Engineers, vol. 82, no. 3, pp. 567-585, 1989. Crossref, https://doi.org/10.1680/iicep.1987.319
[24] H.J.De Vriend, and M.J.F.Stive, “Quasi_3D Modeling of Nearshore Currents,” Coastal Engineering, vol. 11, no. 5-6, pp. 565- 601, 1987. Crossref, https://doi.org/10.1016/0378-3839(87)90027-5
[25] G Winter, "Rip Current Characteristics at the Dutch Coast Egmondaan Zee," Master of Science in the field of Civil Engineering at Delft University of Technology Delft, The Netherlands, 2012.
[26] Tae-Myoung Oh, and Robert G. Dean, “Three Dimensional Hydrodynamics on Barred Beach,” Coastal Engineering Proceedings, 1996. Crossref, https://doi.org/10.9753/icce.v25.%25p