1. “Characteristics of Suspended Sediment and Flow in Downstream of Mekong River, Southern Vietnam”
5/22/2019
Duong Thai Bang (M2)
(Supervised by Prof. Maki Tsujimura)

2. Literature Review Methods Results & Discussion Conclusions
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
Suspended sediment roles
Study area & Objectives

3. Study area SS: suspended sediment Literature Review Methods
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
Suspended sediment roles
Study area & Objectives
SS: suspended sediment
Study area

4. non-linear power fit with additive constant and log-linear fit.
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
Numeric
Hysteric
Nikita I. Tananaev, Sediment rating curves for the Indigirka River at Vorontsovo,
obtained using
non-linear power fit,
non-linear power fit with additive constant
and log-linear fit.

5. SSC: Suspended sediment concentration
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
Numeric
Hysteric
SSC: Suspended sediment concentration
Sun et al, example of SSC-Discharge hysteresis loop
Q (m3/s)
SSC (mg/L) C
Sediment source A
Sediment source B
Sediment discharge
(2)
(1)
(3)
(1) + (2)
(3)
(4)

6. Introduction Literature Review Methods Results & Discussion
Conclusions
5/22/2019
Data & survey
Methods
River
Sea
Positive direction is from the river to the sea
ADCP (acoustic doppler current profiler)
Longphu water stage
Longphu ADCP instrument measurement
Cantho Collum velocity measurement
SS Sampler

7. ABS: Acoustic backscatter (db)
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
Data & survey
Methods
ABS: Acoustic backscatter (db)

8. Deposit area Introduction Literature Review Methods
Results & Discussion
Conclusions
5/22/2019
SS deposition
Spatial
Temporal
Deposit area

9. Sampling Colum for SSC (mg/L)
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
SS deposition
Spatial
Temporal
SSC distribution on the transect - Gary R. Wall , New York – USGS 2006.
“Use of an ADCP to Compute Suspended– Sediment Discharge in the Tidal Hudson”
Sampling Colum for SSC (mg/L)
10 (m)

10. Dry season SS distribution Flood season SS distribution
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
SS deposition
Spatial
Temporal
SSC distribution on the transect
Acoustic backscatter on transect (db)
10 (m)
SSC
300 (mg/L)
Dry season SS distribution
Flood season SS distribution
10 (m)
10 (m)
200
400
600
800
1000
1200 (m)
Mix flow
Tidal dominate flow
River dominate flow
Mix flow
10 (m)
Tidal dominate flow
10 (m)
River dominate flow
200
400
600
800
1000
1200 (m)

11. Positive direction is from the river to the sea
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
SS deposition
Spatial
Temporal
Water Velocity Model
Positive direction is from the river to the sea

12. SSC & Water Velocity Model Dry season Flood season
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
SS deposition
Spatial
Temporal
SSC & Water Velocity Model
Dry season
Flood season
(6)
(2)
(3)
(6)
(4)
(5)
(1)
(4)
(3)
(5)
(2)
(1)
Positive direction is from the river to the sea

13. Deposit area Positive direction is from the river to the sea
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
SS deposition
Spatial
Temporal
Positive direction is from the river to the sea
Deposit area

14. Deposit area Flood peak Dry peak
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
SS deposition
Spatial
Temporal
Deposit area
Dry peak
Flood peak
Positive direction is from the river to the sea

15. Suspended sediment deposits in the middle of the area;
Introduction
Literature Review
Methods
Results & Discussion
Conclusions
5/22/2019
Suspended sediment deposits in the middle of the area;
SSC distribution is strongly related to the river and tidal flow;
SS flow in from upstream at Cantho transect both dry and flood season;
At Longphu (downstream transect), in dry season, SS flow in the area. In flood season SS flow out of the area;
Monthly SS deposits in the study area varies from 0.4 to 2.3 million tons/ month. There are two peak at April (1.7 million ton) and August (2.3 million ton).

16. Introduction Literature Review Methods Results & Discussion
Conclusions
5/22/2019
References
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Sun. (2015). Suspended sediment dynamics at different time scales in the Loushui River, south-central China. Catena.
Wall, G. R. (2006). Use of an ADCP to Compute Suspended–Sediment Discharge in the Tidal Hudson River, New York. USGS Publications.
Walling. (2013). The evolution of sediment source fingerprinting investigations in fluvials systems. J Soils Sediments, 13:1658–1675.
Zhang. (2017). Mechanisms of suspended sediment restoration and bed level compensation in downstream reaches of the Three Gorges Projects (TGP). J. Geogr. Sci.