1. Dredging Methods in the US and South Korea
Pierre Y. Julien
Colorado State University
World Water Forum
Daegu, April 2015

2. Dipper Dredge, NY, USACE

3. Clamshell Dredge

4. Mystic River Clamshell Dredge, New England District, USACE

5. Hopper Dredge

7. Dustpan Dredge

9. Cutterhead Dredge

10. Closed-nose Basket Cutterhead Dredge, Delaware River, USACE

11. Open-nose Basket Cutterhead Dredge, Savannah River , USACE

13. Disposal site for dredged material

16. From Julien
River Mechanics
CUP 2002

18. Middle Rio Grande, NM, USBR

19. Middle Rio Grande, NM, USBR

20. Middle Rio Grande, NM, USBR

21. River Widening and Retrofitting Nakdong River near Busan, South Korea
This provides a schematic of the Greenville Reach and the cutoff

22. Nakdong River Estuary Barrage
from Ji et al. ASCE-JHE, Nov. 2011

23. Problem Statement
16 weirs were constructed under the Four River Restoration Project ( )
After the construction of weirs, sedimentation problems have been occurring upstream of Weirs
Feb. 3rd, 2014
Ipo Weir 10 km upstream (Jun. 18th, 2012)
From Hwayoung Kim, PhD research at CSU, 2016

24. Thank you. Questions?
Photo of Sangju Weir in South Korea from Hwayoung Kim