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Dr. Jung Jae-Sang
Korea Rural Community Corpration

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Research Keywords & Expertise

0 Coastal Engineering
0 Hydraulics
0 Coastal structures
0 Wave Mechanics
0 Estuary dynamics

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Hydraulic engineering
Published: 12 February 2021 in KSCE Journal of Civil Engineering
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In this study, the discharge characteristics through the drainage gates of the Saemangeum tidal dyke were investigated by laboratory experiments, 3D numerical modelling, and field observations. Laboratory experiments were conducted using a 1:50 scale model of the tidal dyke, drainage gate, and seabed topography and field observations were used to validate the experimental results. From the results of these experiments, we derived discharge diagrams that relate the discharge through the drainage gate to the water levels inside and outside the dyke for a range of operating conditions. The formula and discharge coefficients were suggested for free and submerged flows through hydraulic experiments. The discharge predicted from suggested formula agreed well with experimental results. Discharge coefficients of half gates open cases are slightly less than those of all gates open cases due to flow disturbance along the side of downstream. Through experiments with two drainage gates, the Sinsi and Garyok gates, it was found that the discharge coefficients were highly influenced by the terrain around the gates. Numerical simulations were also carried out using a commercial flow modelling software (FLOW-3D). The discharge and flow patterns predicted by the numerical simulations were found to be in good agreement with the measurements.

ACS Style

Jae-Sang Jung; Jae-Seon Yoon; Seokkoo Kang; Seokil Jeong; Seung Oh Lee; Yong-Sung Park. Discharge Characteristics of Drainage Gates on Saemangeum Tidal Dyke, South Korea. KSCE Journal of Civil Engineering 2021, 25, 1308 -1325.

AMA Style

Jae-Sang Jung, Jae-Seon Yoon, Seokkoo Kang, Seokil Jeong, Seung Oh Lee, Yong-Sung Park. Discharge Characteristics of Drainage Gates on Saemangeum Tidal Dyke, South Korea. KSCE Journal of Civil Engineering. 2021; 25 (4):1308-1325.

Chicago/Turabian Style

Jae-Sang Jung; Jae-Seon Yoon; Seokkoo Kang; Seokil Jeong; Seung Oh Lee; Yong-Sung Park. 2021. "Discharge Characteristics of Drainage Gates on Saemangeum Tidal Dyke, South Korea." KSCE Journal of Civil Engineering 25, no. 4: 1308-1325.

Journal article
Published: 15 October 2020 in Water
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The maximum external force acting on a long continuous harbor structure can be reduced by controlling the phase difference of forces acting longitudinally. This strategy can be used to increase the structural stability of breakwaters consisting of caissons. Breakwaters have been developed using interlocking caissons to effectively respond to the constant increase in wave height due to climate change. In this study, we investigated the wave force characteristics and stability of a detached breakwater consisting of open cell caissons interlocked via crushed stones. We performed wave basin experiments and compared the results with analytical solutions of linear diffraction waves. The results revealed that the maximum wave force acting on the front of the breakwater decreased as the incident angle increased, reducing by as much as 79% for an incident angle of 30°. Although the variability of the maximum wave force for each caisson is large owing to the influence of the diffracted waves, the maximum wave force acting on the entire detached breakwater was not significantly affected by this variability. The analytical solutions based on linear wave theory agreed with the experimental results, indicating that the findings can be applied to actual designs. The structural stability of the breakwater was enhanced, even for low incident wave angles, compared to that of a single integral structure, as the frictional resistance produced by the sliding structure increased due to the shear resistance between the filled crushed stones and the rubble mound.

ACS Style

Byeong Wook Lee; Jae-Sang Jung; Woo-Sun Park; Jae-Seon Yoon. Wave Force Characteristics and Stability of Detached Breakwaters Consisting of Open Cell Caissons Interlocked via Crushed Stones. Water 2020, 12, 2873 .

AMA Style

Byeong Wook Lee, Jae-Sang Jung, Woo-Sun Park, Jae-Seon Yoon. Wave Force Characteristics and Stability of Detached Breakwaters Consisting of Open Cell Caissons Interlocked via Crushed Stones. Water. 2020; 12 (10):2873.

Chicago/Turabian Style

Byeong Wook Lee; Jae-Sang Jung; Woo-Sun Park; Jae-Seon Yoon. 2020. "Wave Force Characteristics and Stability of Detached Breakwaters Consisting of Open Cell Caissons Interlocked via Crushed Stones." Water 12, no. 10: 2873.

Journal article
Published: 31 December 2019 in Journal of Korean Society of Coastal and Ocean Engineers
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ACS Style

Jae-Sang Jung; Jae-Seon Yoon. Experimental Study for Overtopping Discharges of Sea Dike having Low Mound and High Wave Wall (LMHW). Journal of Korean Society of Coastal and Ocean Engineers 2019, 31, 335 -343.

AMA Style

Jae-Sang Jung, Jae-Seon Yoon. Experimental Study for Overtopping Discharges of Sea Dike having Low Mound and High Wave Wall (LMHW). Journal of Korean Society of Coastal and Ocean Engineers. 2019; 31 (6):335-343.

Chicago/Turabian Style

Jae-Sang Jung; Jae-Seon Yoon. 2019. "Experimental Study for Overtopping Discharges of Sea Dike having Low Mound and High Wave Wall (LMHW)." Journal of Korean Society of Coastal and Ocean Engineers 31, no. 6: 335-343.

Journal article
Published: 01 May 2018 in Journal of Coastal Research
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Yoon, J.-S.; Ha, T., and Jung, J., 2018. Laboratory experiments on characteristics of perforated-type floating breakwaters. In: Shim, J.-S.; Chun, I., and Lim, H.S. (eds.), Proceedings from the International Coastal Symposium (ICS) 2018 (Busan, Republic of Korea). Journal of Coastal Research, Special Issue No. 85, pp. 1051–1055. Coconut Creek (Florida), ISSN 0749-0208. Floating breakwaters were treated as solid bodies without any perforation in previous studies. In this study, however, a floating breakwater is perforated to allow the partial absorption of the energy produced by incident waves and an air chamber is placed in the upper part to control the breakwater draft. A series of laboratory experiments for a floating breakwater installed with a mooring system are carried out. In general, a mooring system can be classified by the number of mooring points, the shape of the mooring lines, and the degree of line tension. In this study, a four-point mooring is employed since it is relatively easier to analyze the measured results. Furthermore, both the tension-leg and the catenary mooring systems have been adopted to compare the performance of the system. In laboratory experiments, the hydraulic characteristics of a floating breakwater were obtained and analyzed in detail. A hydraulic model was designed to produce wave energy by generating a vortex with the existing reflection method. Analysis on wave changes was conducted and the flow field around the floating breakwater and draft area, which have elastic behavior, was collected using the PIV system. From the test results the strong vortex was identified in the draft area of the perforated both-sides-type floating breakwater. Also, the wave control performance of the floating breakwater was improved due to the vortex produced as the tension in the mooring line decreased.

ACS Style

Jae-Seon Yoon; Taemin Ha; Jaesang Jung. Laboratory Experiments on Characteristics of Perforated-type Floating Breakwaters. Journal of Coastal Research 2018, 85, 1051 -1055.

AMA Style

Jae-Seon Yoon, Taemin Ha, Jaesang Jung. Laboratory Experiments on Characteristics of Perforated-type Floating Breakwaters. Journal of Coastal Research. 2018; 85 ():1051-1055.

Chicago/Turabian Style

Jae-Seon Yoon; Taemin Ha; Jaesang Jung. 2018. "Laboratory Experiments on Characteristics of Perforated-type Floating Breakwaters." Journal of Coastal Research 85, no. : 1051-1055.

Journal article
Published: 01 December 2016 in Journal of Hydro-environment Research
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ACS Style

Su Jin Kim; Jae-Sang Jung; Seokkoo Kang. Fully three-dimensional Reynolds-averaged Navier–Stokes modeling for solving free surface flows around coastal drainage gates. Journal of Hydro-environment Research 2016, 13, 121 -133.

AMA Style

Su Jin Kim, Jae-Sang Jung, Seokkoo Kang. Fully three-dimensional Reynolds-averaged Navier–Stokes modeling for solving free surface flows around coastal drainage gates. Journal of Hydro-environment Research. 2016; 13 ():121-133.

Chicago/Turabian Style

Su Jin Kim; Jae-Sang Jung; Seokkoo Kang. 2016. "Fully three-dimensional Reynolds-averaged Navier–Stokes modeling for solving free surface flows around coastal drainage gates." Journal of Hydro-environment Research 13, no. : 121-133.

Journal article
Published: 04 December 2015 in Journal of Korean Society of Coastal and Ocean Engineers
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ACS Style

Jae-Sang Jung; Changhoon Lee; Yong-Sik Cho. Prediction of Wave Force on a Long Structure of Semi-infinite Breakwater Type Considering Diffraction. Journal of Korean Society of Coastal and Ocean Engineers 2015, 27, 424 -433.

AMA Style

Jae-Sang Jung, Changhoon Lee, Yong-Sik Cho. Prediction of Wave Force on a Long Structure of Semi-infinite Breakwater Type Considering Diffraction. Journal of Korean Society of Coastal and Ocean Engineers. 2015; 27 (6):424-433.

Chicago/Turabian Style

Jae-Sang Jung; Changhoon Lee; Yong-Sik Cho. 2015. "Prediction of Wave Force on a Long Structure of Semi-infinite Breakwater Type Considering Diffraction." Journal of Korean Society of Coastal and Ocean Engineers 27, no. 6: 424-433.

Journal article
Published: 28 February 2013 in Journal of Korean Society of Coastal and Ocean Engineers
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ACS Style

Jae-Sang Jung; Changhoon Lee; Yong-Sik Cho. Directional Asymmetry Parameter and Maximum Spreading Parameter of Random Waves Incident on a Planar Slope. Journal of Korean Society of Coastal and Ocean Engineers 2013, 25, 28 -33.

AMA Style

Jae-Sang Jung, Changhoon Lee, Yong-Sik Cho. Directional Asymmetry Parameter and Maximum Spreading Parameter of Random Waves Incident on a Planar Slope. Journal of Korean Society of Coastal and Ocean Engineers. 2013; 25 (1):28-33.

Chicago/Turabian Style

Jae-Sang Jung; Changhoon Lee; Yong-Sik Cho. 2013. "Directional Asymmetry Parameter and Maximum Spreading Parameter of Random Waves Incident on a Planar Slope." Journal of Korean Society of Coastal and Ocean Engineers 25, no. 1: 28-33.

Journal article
Published: 02 January 2013 in Journal of Coastal Research
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Jung, J.-S. and Cho, Y.-S., 2013. A 3D Hydrodynamic Model for Determination of Maximum Food Level inside Saemangeum Embankment In this study, the variation of flood water level inside the Saemangeum Embankment is studied. In particular, the maximum flood level inside the Embankment is investigated for design of the land reclamation level. Water level inside the Embankment may be affected by flooding from connected rivers, tides and discharges through gates. The tidal range outside Embankment is about 6.0~7.5m. The water level is numerically simulated by using a commercial hydrodynamic model: Delft3D-Flow. By analyzing measured tidal data measured over 31 years (1981–2011), the smallest tidal difference is selected for simulations. The maximum flood level inside Embankment generally increases as the tidal difference decreases because the sea level outside Embankment is relatively high during the ebb tide.

ACS Style

Jung Jae-Sang. A 3D Hydrodynamic Model for Determination of Flood Level inside Saemangeum Embankment. Journal of Coastal Research 2013, 65, 243 -248.

AMA Style

Jung Jae-Sang. A 3D Hydrodynamic Model for Determination of Flood Level inside Saemangeum Embankment. Journal of Coastal Research. 2013; 65 ():243-248.

Chicago/Turabian Style

Jung Jae-Sang. 2013. "A 3D Hydrodynamic Model for Determination of Flood Level inside Saemangeum Embankment." Journal of Coastal Research 65, no. : 243-248.

Book chapter
Published: 01 November 2011 in Asian And Pacific Coasts 2011
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In this study, we consider diffraction effect in analyzing wave loads on a long structure. When waves are obliquely incident on a long structure, the diffracted wave give forces on the lee side of the structure. Thus, the wave loads increase with the existence of diffracted waves and also the phase difference between the incident and diffracted waves. We further consider directional asymmetry effect in analyzing wave loads on a long structure. The force reduction parameters were analytically derived and verified with experimental data.

ACS Style

Jung Jae-Sang; C. Lee; Y.-S. Cho; Joseph Hun-Wei Lee; Chiu-On Ng. EFFECTS OF DIFFRACTION AND DIRECTIONAL ASYMMETRY OF RANDOM WAVE LOADS ON A LONG STRUCTURE. Asian And Pacific Coasts 2011 2011, 1695 -1702.

AMA Style

Jung Jae-Sang, C. Lee, Y.-S. Cho, Joseph Hun-Wei Lee, Chiu-On Ng. EFFECTS OF DIFFRACTION AND DIRECTIONAL ASYMMETRY OF RANDOM WAVE LOADS ON A LONG STRUCTURE. Asian And Pacific Coasts 2011. 2011; ():1695-1702.

Chicago/Turabian Style

Jung Jae-Sang; C. Lee; Y.-S. Cho; Joseph Hun-Wei Lee; Chiu-On Ng. 2011. "EFFECTS OF DIFFRACTION AND DIRECTIONAL ASYMMETRY OF RANDOM WAVE LOADS ON A LONG STRUCTURE." Asian And Pacific Coasts 2011 , no. : 1695-1702.

Journal article
Published: 31 October 2010 in Journal of Korea Water Resources Association
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ACS Style

Jae-Sang Jung; Bum-Hyung Kim; Hyung-Jun Kim; Yong-Sik Cho. Calculation of the Peak-delay Force Reduction Parameter of Multi-Directional Random Waves Acting on a Long Caisson Breakwater. Journal of Korea Water Resources Association 2010, 43, 843 -850.

AMA Style

Jae-Sang Jung, Bum-Hyung Kim, Hyung-Jun Kim, Yong-Sik Cho. Calculation of the Peak-delay Force Reduction Parameter of Multi-Directional Random Waves Acting on a Long Caisson Breakwater. Journal of Korea Water Resources Association. 2010; 43 (10):843-850.

Chicago/Turabian Style

Jae-Sang Jung; Bum-Hyung Kim; Hyung-Jun Kim; Yong-Sik Cho. 2010. "Calculation of the Peak-delay Force Reduction Parameter of Multi-Directional Random Waves Acting on a Long Caisson Breakwater." Journal of Korea Water Resources Association 43, no. 10: 843-850.

Journal article
Published: 01 January 2010 in Journal of Waterway, Port, Coastal, and Ocean Engineering
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In this study, a more general directional spreading function is developed that allows for asymmetric directional distributions. For multidirectional random waves that approach the shore obliquely over a planar slope, we demonstrate that directional asymmetry is generated due to wave refraction. The asymmetry created by refraction increases with the offshore peak wave direction. The present spreading function is compared to a preexisting symmetric spreading function and is shown to better capture changes in the directional distribution that occur in a refracting, random wave field. Finally, the new asymmetric spreading function is compared to a long time series of wave directional spectra measured at a nearshore field site. The results demonstrate that refraction-induced asymmetry is common in the nearshore and the asymmetric spreading function gives an improved analytic representation of the overall directional distribution as compared to the symmetric function.

ACS Style

Changhoon Lee; Jae-Sang Jung; Merrick C. Haller. Asymmetry in Directional Spreading Function of Random Waves due to Refraction. Journal of Waterway, Port, Coastal, and Ocean Engineering 2010, 136, 1 -9.

AMA Style

Changhoon Lee, Jae-Sang Jung, Merrick C. Haller. Asymmetry in Directional Spreading Function of Random Waves due to Refraction. Journal of Waterway, Port, Coastal, and Ocean Engineering. 2010; 136 (1):1-9.

Chicago/Turabian Style

Changhoon Lee; Jae-Sang Jung; Merrick C. Haller. 2010. "Asymmetry in Directional Spreading Function of Random Waves due to Refraction." Journal of Waterway, Port, Coastal, and Ocean Engineering 136, no. 1: 1-9.

Conference paper
Published: 01 January 2009 in Volume 4: Ocean Engineering; Ocean Renewable Energy; Ocean Space Utilization, Parts A and B
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In this study, a more general directional spreading function is developed that allows for asymmetric directional distributions. For multi-directional random waves that approach the shore obliquely over a planar slope, we demonstrate that directional asymmetry is generated due to wave refraction. The asymmetry created by refraction increases with the offshore peak wave direction. The present spreading function is compared to a pre-existing symmetric spreading function and is shown to better capture changes in the directional distribution that occur in a refracting, random wave field. Finally, the new asymmetric spreading function is compared to a long time series of wave directional spectra measured at a nearshore field site. The results demonstrate that refraction-induced asymmetry is common in the nearshore and the asymmetric spreading function gives an improved analytic representation of the overall directional distribution as compared to the symmetric function.

ACS Style

Changhoon Lee; Jae-Sang Jung; Merrick C. Haller. Asymmetry in Directional Spreading Function of Sea Waves Due to Refraction. Volume 4: Ocean Engineering; Ocean Renewable Energy; Ocean Space Utilization, Parts A and B 2009, 415 -423.

AMA Style

Changhoon Lee, Jae-Sang Jung, Merrick C. Haller. Asymmetry in Directional Spreading Function of Sea Waves Due to Refraction. Volume 4: Ocean Engineering; Ocean Renewable Energy; Ocean Space Utilization, Parts A and B. 2009; ():415-423.

Chicago/Turabian Style

Changhoon Lee; Jae-Sang Jung; Merrick C. Haller. 2009. "Asymmetry in Directional Spreading Function of Sea Waves Due to Refraction." Volume 4: Ocean Engineering; Ocean Renewable Energy; Ocean Space Utilization, Parts A and B , no. : 415-423.

Journal article
Published: 01 September 2007 in Journal of Coastal Research
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ACS Style

Jae-Sang Jung; Yong-Sik Cho. Bragg Reflection of Random Waves with the Boussinesq Equations. Journal of Coastal Research 2007, 23, 1141 .

AMA Style

Jae-Sang Jung, Yong-Sik Cho. Bragg Reflection of Random Waves with the Boussinesq Equations. Journal of Coastal Research. 2007; 23 (5):1141.

Chicago/Turabian Style

Jae-Sang Jung; Yong-Sik Cho. 2007. "Bragg Reflection of Random Waves with the Boussinesq Equations." Journal of Coastal Research 23, no. 5: 1141.

Journal article
Published: 01 January 2006 in Ocean Engineering
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ACS Style

Yong-Sik Cho; Jae-Sang Jung. Bragg resonant reflection of carrier waves composing wave groups. Ocean Engineering 2006, 33, 82 -92.

AMA Style

Yong-Sik Cho, Jae-Sang Jung. Bragg resonant reflection of carrier waves composing wave groups. Ocean Engineering. 2006; 33 (1):82-92.

Chicago/Turabian Style

Yong-Sik Cho; Jae-Sang Jung. 2006. "Bragg resonant reflection of carrier waves composing wave groups." Ocean Engineering 33, no. 1: 82-92.

Journal article
Published: 01 June 2005 in Journal of Korea Water Resources Association
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ACS Style

Jae-Sang Jung; Yong-Sik Cho. Weakly Nonlinear and Dispersive Wave Equations for Random Waves. Journal of Korea Water Resources Association 2005, 38, 429 -438.

AMA Style

Jae-Sang Jung, Yong-Sik Cho. Weakly Nonlinear and Dispersive Wave Equations for Random Waves. Journal of Korea Water Resources Association. 2005; 38 (6):429-438.

Chicago/Turabian Style

Jae-Sang Jung; Yong-Sik Cho. 2005. "Weakly Nonlinear and Dispersive Wave Equations for Random Waves." Journal of Korea Water Resources Association 38, no. 6: 429-438.

Journal article
Published: 01 September 2004 in Journal of Korea Water Resources Association
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ACS Style

Jae-Sang Jung; Dae-Hee Cho; Jong-Kil Hwang; Yong-Sik Cho. Reflection of Random Waves Propagating over Rectangular Submerged Non-Porous Breakwaters. Journal of Korea Water Resources Association 2004, 37, 729 -736.

AMA Style

Jae-Sang Jung, Dae-Hee Cho, Jong-Kil Hwang, Yong-Sik Cho. Reflection of Random Waves Propagating over Rectangular Submerged Non-Porous Breakwaters. Journal of Korea Water Resources Association. 2004; 37 (9):729-736.

Chicago/Turabian Style

Jae-Sang Jung; Dae-Hee Cho; Jong-Kil Hwang; Yong-Sik Cho. 2004. "Reflection of Random Waves Propagating over Rectangular Submerged Non-Porous Breakwaters." Journal of Korea Water Resources Association 37, no. 9: 729-736.

Journal article
Published: 01 June 2003 in Journal of Korea Water Resources Association
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ACS Style

Jae-Sang Jung; Yong-Sik Cho. Bragg Reflection of Long Waves Generated by Short Wave Groups on a Sloping Beach. Journal of Korea Water Resources Association 2003, 36, 413 -422.

AMA Style

Jae-Sang Jung, Yong-Sik Cho. Bragg Reflection of Long Waves Generated by Short Wave Groups on a Sloping Beach. Journal of Korea Water Resources Association. 2003; 36 (3):413-422.

Chicago/Turabian Style

Jae-Sang Jung; Yong-Sik Cho. 2003. "Bragg Reflection of Long Waves Generated by Short Wave Groups on a Sloping Beach." Journal of Korea Water Resources Association 36, no. 3: 413-422.