1. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Estimating Annual Cadmium Load
via Surface Runoff
into Songkhla Lake, Thailand
Kitipan Kitbamroong, Ph. D
G.Padmanabhan, Ph. D
Penjai Sompongchaiyakul, Ph. D
2. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Problem
Increasing agricultural activities in the
catchments of Songkhla Lake have the
potential to increase cadmium accumulation
in the lake.
Cadmium was found in the lake sediments
Cadmium is common in phosphate rocks
Surface runoff and associated sediment flow
are the major mechanisms of transport of
non-point source pollutants
3. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Research Objectives
To develop a database for non-point source
cadmium transport modeling of the Lake
Basin from the surrounding drainage area.
To carry out a scenarios analysis of the
cadmium transport to the lake from the
surrounding drainage areas to assist
environmental decision makers.
4. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Methodology
A spatially distributed cell-based model is
proposed.
Data to be assembled from local sources on
landuse, soils, fertilizers, and practices.
Meaningful scenarios will be constructed
For each scenario, the model runs will be
analyzed.
Results will be presented to the decision
makers.
5. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Non-Point Source Models
Available models:
MIKE SHE
SWAT
BASINS
TREX
AnnAGNPS
Criteria
Predominant land use: agricultural
Data input requirements: local
Integration with GIS: Arcview
Metals transport
6. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Model and Scenarios Used
Non point source pollution modeling of
cadmium
TREX (Two-dimenstional Runoff, Erosion, and
eXport model)
Scenarios
Three scenarios were tested:
Significant increase and decrease of fertilizer
usage.
Change in types of fertilizer applied.
Change in the application rate of fertilizer for
certain crops.
7. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
TREX
Two-dimensional Runoff, Erosion, and Export
model is a generalized rainfall-runoff watershed
model with a framework for modeling sediment
and contaminant transport.
Based on the CASC2D watershed model with
chemical transport and fate processes from the
USEPA WASP and IPX series of stream water
quality models
Three main components: 1) hydrology 2)sediment
transport, and 3) chemical transport and fate.
8. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
TREX
9. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Research Activities Flow Diagram
Model
Source
Mgt Tools
SFA
Pre-Processing
Post-Processing
GIS
10. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
GIS
The acquired information was compiled in a
Geographical Information System (GIS) –
ArcView.
The TREX model was run and the result
presented within ArcView.
Pre-processing of data and post processing
of the model results were done in the GIS
platform.
11. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Watershed Delineation
Figure 3-7 Steps performed during watershed delineation
12. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
8 Watersheds
13. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Model calibration
The model parameters subject to the
calibration were
hydraulic conductivity
soil erodibility
flow resistance
crop management factor
chemical distribution coefficients.
14. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Model calibration
Chemical distribution coefficients – depending
on metal of interest
15. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Model calibration
Parameters of the model are perturbed until
an acceptable difference between measured
and model-generated output is obtained.
16. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Model validation
The model is run here with the calibrated
parameters to compare the performance of
the model with measured data (Suviboon,
2006; Leekpai, 2006).
17. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Calibration
20 Stations
Precipitation runoff
Sedimentation Loss
Cd content in sediment
Relative error between
5-20%
18. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Verification
220 sampling
points
Precipitation runoff
Sedimentation Loss
Cd content in
sediment
Relative error
between 10-30%
19. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
hydraulic conductivity
20. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
soil erodibility
21. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
flow resistance
22. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
crop management
factor
23. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Cadmium
Model Performance
Calibration pts
Validation pts
24. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Scenario Analysis (1.1)
Increase Fertilizer
usage by 10%
25. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Scenario Analysis (1.2)
Increase Fertilizer
usage by 50%
26. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Scenario Analysis (1.3)
Decrease usage by
10%
27. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Scenario Analysis (1.4)
Decrease usage by
50%
28. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Scenario Analysis (2)
changing types of
fertilizer
7.19 mg/kg cadmium 7.27 mg/kg cadmium
29. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Scenario Analysis (2)
changing types of
fertilizer
30. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Scenario Analysis (3)
change of crops grown
in the area
31. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Conclusion
Substance Flux Analysis
41,745 tons/year of phosphorus, and 273
kg/year of cadmium from phosphate fertilizer
were induced into SLB.
The stock calculation for phosphorus and
cadmium were found to be 248.7 tons/year
and 62.8 tons/year respectively.
32. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Conclusion
TREX Modeling
U-Tapao watershed had the highest potential of
phosphorous and cadmium transportation in the
sediment runoff.
Factors promoting includes;
run off – high runoff
elevation – steep slope
soil erodibility – high erosion
organic matter – high
pH –acidity
crop management – horticultural crops
clay – high percentage
total metal – high
33. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Conclusion
Scenario Analysis
A total of three scenarios were demonstrated
and tested in U-Tapao sub watershed.
Alone by changing the fertilizer formula, from high
to low contaminated cadmium lead towards a
significant decrease of cadmium contribution to
the watershed.
34. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Acknowledgements
Asst. Prof. Dr. Chatchai Ratanachai (PSU)
Dr. Manaskorn Rachakornkij (CU)
Lecturers and staffs of NRC-EHWM
35. International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
International Conference on Environmental and Hazardous Substance Management: Towards a Green Economy, Bangkok, Thailand.
May 21-23, 2013
Q&A