home    land degradation    project outcome    Gallery Flooding Flood Hazard Assessment Pilot Area • The Pilot Areas • Climate • Cover factor (C) estimation • Digital terrain analysis • Relationship between soil properties • Relationship of soil properties with different land use/cover types Methodology • Methodologies • LISEM Results • Result Soil Properties and Land Use • Runoff rate for different land cover types • Model calibration and validation • Sensitivity analysis • Land use scenarios • Rainfall size scenarios • Flooding Scenario - 2 years return period • Flooding Scenario - 10 years return period • Flooding Scenario - 20 years return period • Flooding Scenario - 50 years return period • Summary tables for each flood characteristic • Flood hazard mapping • Conclusions and Recommendation Erosion Erosion Assessment Pilot Area • The Pilot Areas • Climate • Cover factor (C) estimation • Digital terrain analysis • Relationship between soil properties • Relationship of soil properties with different land use/cover types Methodology • Methodologies • Erosion Models Result • Results • C-Factor Mapping for erosion assessment • Soil erosion assessment • Assessment of land use/cover change effect on soil erosion • Assessing critical zones for ephemeral gully formation • Erosion Assessment by Different Models • The recommended erosion models • RMMF Landslide Case I • Landslide hazard assessment • The area (Pilot 3) • Landslide Mapping in Wang Chin using digital image analysis Techniques. • Results • Discussions Case II • Doi Ang Khang (Ang Khang) (Pilot area 4) • Landslide mapping in Ang Khang using aerial photos • Landslide Inventory Mapping • Landslide modelling and Susceptibility mapping • Landslide Susceptibility Maps from the three Scenarios (models) • Comparison between Ang Khang and Wang Chin (with respect to weights of evidence modelling using morphometric parameters) Salinization Case I • Pilot area II • Soil salinity • Salinization • Geomorphology • Soils • Geopedologic map • Results Case II • CASE II - The study of Yadav, R.D. (2005), • Methodology • Crop Simulation Model • PS 123 • Results • Mathematical (Regression) Model for Crop Yield Estimation • Conclusion Case III • Case III • Modeling Salinization • Geostatistics and Interpolation (GIS and Kriging) • Model Simulation and Prediction of Salinity • Simulated Depth to water table • Tenth Years Prediction • Twenty Years Prediction • Conclusion Runoff • Surface Runoff • Methodology • Modelling Runoff • Modelling Runoff Using Empirical Approach • Modelling runoff using the Semi-physical approach • Estimation with the Curve Number Method • Results and Discussion • Generation of Scenarios • Comparison of runoff rates with soil loss map • Conclusions • Presentation of papers based on project work at international • Workshop in Lomsak • Hua Hin seminar • Training of LDD staff • GIS and RS based predictive soil mapping • Soil erosion assessment • Landslide hazard assessment • Flood hazard assessment • Soil salinity study • List of completed MSc. theses on project TENTH YEARS PREDICTION OF SALINTY A different situation is predicted in the transition zone (table.1) where no area would be under severe salinity but the majority of the relief units would be under high salinity levels, except for the ridge, vale and glacis which would be moderately saline after ten years time. However the glacis would be almost close to 50/50 basis as around 45% of its area would be highly saline and just above 50% would be moderately saline. Quite very small areas are predicted to be under low salinity levels for both zones. Table 2. indicate salinity severity levels in terms of the entire area, where the root-zone would have 43%, 32% and 17% of the land highly, moderate and severely saline respectively. For the transition zone the major areas are under moderate (60%) and high (36%) saline conditions with only 4% under low salinity and none under severe salinity. The prediction maps for both zones are given in figure 1. Table 1 : Percent area per severity levels for root zone Relief Unit Total area (ha) Percentage area per salinity level Low salinity Moderate High salinity Severe salinity ECe (dS/m) 0 - 4 4 - 8 8 - 16 > 16 Floodplain 74450 0.10 0.67 24.71 74.51 Glacis 2106.75 1.27 9.61 63.96 25.16 Lateral Vale 3254.50 0.14 3.56 52.36 43.94 New terraces 119.00 0.00 1.26 32.56 66.18 Old terraces 556.75 1.21 10.91 60.44 27.44 Ridge 12994.50 10.24 45.47 37.04 7.26 Vale 2120.25 7.49 45.71 43.47 3.33 Table 2 : Percent area per severity levels for transition zone Relief Unit Total area (ha) Percentage area per salinity level Low salinity Moderate High salinity Severe salinity ECe (dS/m) 0 - 4 4 - 8 8 - 16 > 16 Floodplain 74450 0.00 1.71 98.29 0.00 Glacis 2106.75 1.34 53.30 45.35 0.00 Lateral Vale 3254.50 0.11 27.39 72.50 0.00 New terraces 119.00 0.00 4.41 95.59 0.00 Old terraces 556.75 0.31 22.50 77.19 0.00 Ridge 12994.50 6.13 71.86 22.02 0.00 Vale 2120.25 5.86 84.46 9.68 0.00 Figure 1 : Reclassified maps for root zone for the tenth years prediction Development of Methodologies for Land Degradation Assessment Applied to Land Use Planning in Thailand ^go to top