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
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
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.
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.
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
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.
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.
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
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-ProcessingGIS
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.
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
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
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.
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
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.
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).
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%
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%
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
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
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
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
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
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%
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%
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%
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%
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
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
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
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.
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
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.
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
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