1

Pierre Y. Julien

Reservoir Sedimentation: Problems and Solutions

Department of Civil EngineeringColorado State University

Fort Collins, Colorado

UNITEN-TNBR Short CourseKuala Lumpur – July 21 2006

Objectives

Brief overview of Solutions to Reservoir Sedimentation Problems:

1. Upland Erosion Control;2. River Sedimentation Solutions;3. Reservoir Sedimentation Solutions.

1. Upland Erosion Control

Tala HE Project

2

Upland Erosion of the Loess Plateau of the Yellow River Basin

Small Checkdam (Kalong II)

3

2. River Sedimentation Solutions

4

5

Environmental Considerations Example 3-D Model Mississippi

Dykes Cottage Bend

1995

1976

1984

3. Reservoir Sedimentation Solutions

L&D No. 3

Locks and Dams

6

Sedimentation Problems Can Be Solved

Wonogiri survey paths

Bed Profile - 1988

250

270

290

310

330

350

370

0 10 20 30 40 50 60

Distance from Main Dam (KM)

Elev

atio

n (m

)

OGL,1967SURVEYED,1988SIMULATED,1988

Reservoir storage capacity of Sempor Dam

30

35

40

45

50

55

60

65

70

75

0 5 10 15 20 25 30 35 40 45 50

Volume (million m3)

Ele

vatio

n (m

)

197719811982198419942004

Volume (million m3)

Elev

atio

n (m

)

7

Sediment Plug1,400 cfs

Fuensanta reservoir of the river Segura in Spain Bengal and Indus

8

Sediment Flushing

CSU Hydraulics Laboratory

9

Acknowledgments

• Dr. Phil Combs (USACE-ERDC)• Dr. Drew Baird (US Bureau of Reclamation)• Dr. Sang-Kil Park ( PNU)• Dr. Y. Lan and D. Elsner (URS)• Dr. Gigi Richard (Mesa State College)• Un Ji and James Halgren (CSU)• Dr. Z.Y. Wang (IRTCES)• Dr. Chris Thornton (CSU – Hydraulics Lab.)• Dr. Dan Gessler, CSU and Alden Labs

Erosion and River Mechanics Textbooks

TEST

THANK YOUfor your

participation!

pierre@engr.colostate.edu