Poster luận văn thạc sĩ CHLB Đức

Nguyen Duc Viet, Water Resources Management , Vietnam

IMPROVEMENT OF WATER SUPPLY FOR AGRICULTURAL PRODUCTION THROUGH OPERATION AND MANAGEMENT BY CONSIDERING SALINITY INTRUSION ADAPTATION
CASE STUDY: TU CAU IRRIGATION SYSTEM, VU GIA_ THU BON RIVER BASIN, VIETNAM

Master Thesis (MSc)

Problem Statement & Goals

Currently, climate change is affecting more and more to human life. Viet Nam is one of the five countries forecasted to be affected seriously
by climate change, specifically the phenomenon of sea level rise and salinity intrusion.
The main objective is to enhance the water supply efficiency and to propose feasible measures to adapt climate change impacts for Tu Cau
irrigation system, Vu Gia - Thu Bon river basin through operation and management.

Methods

Statistics of rice cultivation area of years 2008, 2009, 2010 and 2011

1. Tu Cau irrigation system (pump units, intake, canals, etc)

6. Propose O&M models to adapt salinity intrusion

450

The Operation and Management (O&M)

400

424.330

Winter - spring crop area

391.200

Summer - Autumn crop area

350

measures are based on existing conditions

2. Assess the status of Tu Cau irrigation system under salinity

5. Concentrate on measures for Operation & Management

intrusion.

such as local reservoirs and tidal regime.

308.000
300.000

300

295.000

290.000

250
200

169.000

150

4. Identify causes of water shortage corresponding to salinity

3. Water balance calculations for agricultural production

175.000

intrusion.

100
50

Unit: ha

Oriented research

0
2008

2009

2010

2011

Application

Main causes

Water Balance Calculation

Some main causes of water supply shortage for Tu Cau irrigation system,

Soil cultivation

Discussions

Stage of rice

1. “Utilization of regulating reservoirs”

Meteorology

including:

Set up operating procedure to take water from Sen and Cung reservoirs to increase
CROPWAT 8.0

•Operation of Tu Cau pumping station is affected by salinity intrusion upon Vinh

water supply capacity  Total water volume permitted to be pumped into the

η ST

Dien river;

‰

Irrigation area

Discharge pump

Coefficient of rice (q)

(ω)

(QP)

Days of salinity

λ

Discharge of water demand for rice

Discharge of water supply by Tu Cau Irr system

(QWD)

(QWSL)

Concentration of salt on July 2011 - 7.00AM

regulating reservoir:

Initial concentration

1‰

2‰

3.4‰

4.8‰

5.5‰

8.1‰

7
Concentration of salt

6
5

2

1.1

4

00.1
6 8

2.1
1.2

0.50.4

0.1
0 0
0 2

3.9

e

1

Low water discharge of Tu Cau Irr system

Days of rice stage

105,000

96,500

48,250

32,167

32,167

19,300

2. Operating the pumping station based on tide amplitude (Vtide)

(QWS)

5.2 4.8

Dat

2.4
2.3

3
Vrl (m )

4.6

3.2
3.4
2.1

6

5.2

4.3

3

•

5.2

5

4

1

6.3

2.3
2.5

3.2

2.5

Total volume of water shortage of Tu Cau Irr (V WS)

2.3

η ST
•

1.2

0.8‰

: Efficiency of canal system at Tu Cau irrigation systems;

•λ



Changing in O&M relating tide amplitude:



If salt concentration ≥ 0.8‰: “not pump and measure continuously salt

≥≥ 0.8‰
0.8‰

Measuring
Measuring of
of salt
salt

concentration”.

: The time percentage of Tu Cau pump station can operate under impact of



Salt
Salt concentration
concentration

concentration
concentration

If salt concentration < 0.8‰: running WXTide_32 version 4.7 software
1 hour

10 12 14 16 18 20 22 24 26 28 30 32

3
Actual discharge of one pump is about 66% (600m /h in comparison with original

developed by Dave Flater at Da Nang estuary:

salinity intrusion corresponding to each stage of rice.

3
design is 900m /h);

1 hour

1 hour

<< 0.8‰
0.8‰



If the tide is up, “stop pumping and measure continuously”;



If the tide is down, pump immediately, during pumping, measure

Last point

<< 0.8‰

0.8‰

continuously salt concentration 30 minutes/ time. If >0.8‰, immediately

•Tu Cau pumping station is only operational when salt concentration below 0.8‰.

stop pumping.

2700
2,400.00
2400

2,400.00

2,400.00

2100
1,762.36
1800

1,762.36

1,762.36

QWD
Qwsl
1,650.00

1,733.28

Pump
Pump

Results

Test water sample

30 minutes

Test water sample

30 minutes

1,600.08

1500
240000

1200
900

≥ 0.8‰

600

505.60

534.49

505.60

534.49

Salt concentration

concentration

≥ 0.8‰

1 hour

1 hour

211,700

200000

300

Measuring of salt

220,200
220000

Total water storage volume after changing O&M
Total
Total
volume of water shortage in the Summer – Autumn crop, 2011
Vlw

218.16

0

180000

167,022

163,450

1 hour
Case 1

< 0.8‰

•The total volume of water shortage at Tu Cau irrigation system as below:

Case 2

VWS = 22 * 24 * 316.33 = 167,022.24 m

Test water sample

< 0.8‰

3

160000

147,367

147,367
134,500

140000
120000

Pump
Test water sample

Test water sample

1 hour
1 hour

www.termavn-master.info

Supervisors
Pro. Dr. Sabine Schlüter
Dr. Phong Nguyen Tung

Project Partners

Supported by