APPLICATION OF NEURO-GENETIC OPTIMIZER FOR SEDIMENT FORECASTING IN LAM PHRA PHLOENG RESERVOIR Thanyalak Iamnarongrit Assoc. Prof. Kampanad Bhaktikul, Assoc. Prof. Chalie Navanugraha, Prof. Thongplew Kongjun Faculty of Environment and Resource Studied, Mahidol University

- Background of the study - Neuro-genetic Optimizer Model - Methodology - Results - Conclusions

Upper catchments LamTaKlong LamPhraPhloeng MunBon LamChae Reservoir River Basin Mun River Basin Khao Yai

Land Use Type in Lam Phra Phloeng River Basin Land Use Type Rai % % % % Dry Evergreen Forest 268, , , , Dry Dipterocarp Forest 3, , , Water Bodies 8, , , , Forest Plantatio n , , Residenc e Orchard , , , Crop230, , , , Total512, , , , Thongchai Charupput (2002)

Storage Volume had decreased LamTaKlong LamPhraPhloeng MunBon LamChae Reservoir River Basin Mun River Basin Upper catchments

Capacity of Lam Phra Phloeng Reservoir from 1970 to 2004 Yea r Capacity of Dam (mcm) Year Peri od (yea r) Decrease of Capacity (mcm) to to to Total 1970 to Royal Irrigation Department (2004)

Background of the Study (Con’t)  Most of previous researches concerning sediment in watershed area  Linear model to find association between land use changes in the area and sediment volume.  Dynamic in characteristics with rapid changes that occur constantly.  Non-Linearity Model

Neuro-genetic Optimizer Model  Hybrid Model  Artificial Neural Network (ANNs) and Genetic algorithm (GAs)  GAs in the structural improvement of network and selecting key variables as one way to solve problem that could applied with solving existing problems.  Recognize pattern and find association among various affecting factors and use them in forecasting.

Structure of Neuro-genetic Optimizer e e e e Inp u t s Hidden Laye r Outp u t s Tar g e t Back- propagati on errors Neuro-genetic algorithms

Methodology  Collection and Analysis data  Land Use Data Analysis  The Estimating of Soil Loss with the Universal Soil Loss Equation  Application of Neuro-genetic Optimizer model

Results  Land Use Change  Evaluation of Sediment from Soil Erosion  Application of Neuro- genetic Optimizer model

The Change of Land Use in Lam Phra Phloeng River Basin between 2002 and 2005 Land Use Type Area (rai) 2002 Area (rai) 2005 Changing (rai) Changing Percentage 1. Agricultural Area 244,661215, Mixed upland crop Crops 239,773209,872-29, Sugarcane 2,8373, Orchard 2,0512, Forest Area 256,146205,926-50, Dry Evergreen Forest 30,37425,195-5, Dry Dipterocarp Forest 225,772180,731-45, Miscellaneous Area 1,84280,669+78, Open Land 1,84280,669+78, Water Area 3,0603, Water Bodies 3,0603, Total505,

Soil Erosion Classes above Upper Lam Phra Phloeng Reservoir between 2002 and 2005 Soil loss Rating Area in 2002Area in 2005 Total Sediment from Soil Erosion (tons/year) in 2002 Total Sediment from Soil Erosion (tons/year) in 2005 Rai % % Very Slight 313, , ,22727,777 Slight 39, , ,32870,803 Moder ate 154, , ,252176,783 Severe 4, , ,37134,174 Very Severe 3, , ,59472,576 Total 514, , ,771382,112

in

in

Before Calibration

R 2 = 1 RMSE = 0.58 After Calibration

Sediment Comparison between Actual Data, Regression Model, and Neuro-genetic Optimizer Months Actual Data Regressio n model Neuro-Genetic Optimizer April May June July August September 25,89623, ,168.8 October 5,6215,529.55,554.5 November 14,58113, ,450.9 December January February March Annual Sediment Volume (tons) 48,69745,34649,856 Different from actual data (ton) 3,5511,160 Y = x

Neuro – genetic Optimizer

 Forest area decreased approximately 36%, which was converted to agricultural.  Land use change affects the sediment volume due to soil loss.  Neuro-genetic Optimizer model provided forecast results for the Lam Phra Phloeng reservoir closer to the actual sediment volume than the regression model. CONCLUSIONS

 The index of efficiency for Neuro-genetic Optimizer model was approximately 99%.  The forecast did not require much data.  Saved time and Expenses involved in the data collection process. CONCLUSIONS (Con’t)

The Neuro-genetic Optimizer model is appropriate to be apply and aid the decision making process and further planning of reservoir management in the dynamic ecosystem and land use change. CONCLUSIONS (Con’t)

Flowchart of Neuro-genetic Optimizer AN Ns Pro ces s GAs Proce ss

Factors - Land Use Change - Rainfall - Runoff Regression model Calibration and Validation Sediment from Model Methodological Framework Analysis of data Neuro-genetic Optimizer Model Test and Verification compare with Actual Sediment Analysis and Conclusion Correlation Coefficient of variable Dividing Data Span Sedimen t calculate d from USLE

Sensitivity Analysis (Con’t)

Objectives 1. To study the land use changes in Lam Phra Phloeng river basin which affected sediment load in reservoir using LANDSAT-5 TM. 2. To apply Neuro-genetic Optimizer model in forecasting the sediment in Lam Phra Phloeng reservoir. 3. To compare results among Neuro- genetic Optimizer model, Regression Model, and the real data of sediment load in the reservoir.

Soil UnitTopographic MapRainfall DataLANDSAT-TM 2002 &2005 Soil Map DEM Map Slope Map LS-factorK-factor Digital Image Processing Supervised Classification Land Use Map C-factor Isohyets Map R-factor Soil Erosion Hazard Model (USLE) Elevation Map Digitiz ing Scan ning Interpul ation Schematic of Soil Erosion Hazard Model in Lam Phra Phloeng River Basin