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Table of Contents
Preface; Acknowledgments; Contents; Abbreviations; 1 Introduction; 1.1 Key Concepts on Landslide; 1.2 A Brief Account of Some Destructive Landslides Occurrences; 1.3 Relevance of the Landslide Study; 1.4 Landsliding in Darjiling Himalaya; 1.5 Mechanism and Causes of Landslides; 1.6 Types and Classification of Landslide; 1.7 Objectives of the Present Work; 1.8 Applied Methodology; 1.9 Data Used for Quantitative Study on Landslide; 1.10 Existing Literature on Landslide Inducing Parameters; 1.11 Slope Stability Models; 1.11.1 Hydrological Models and Slope Stability
1.11.2 Landslide Susceptibility Zonation Models Concept1.12 Study on Landslide Management; References; 2 Geo-spatial Variability of Physiographic Parameters and Landslide Potentiality; Abstract; 2.1 Introduction; 2.2 Assessment of Geomorphic Attributes; 2.2.1 Analysis of Contour Orientation; 2.2.2 (DEM); 2.2.3 Hypsometric Analysis; 2.2.4 Lithological Composition and Landslide Potentiality; 2.2.5 Analysis of and Landslide Potentiality; 2.2.6 Slope Angle and Landslide Potentiality; 2.2.7 Slope Aspect and ; 2.2.8 The Surface Curvature and Landslide Potentiality; 2.3 The Soil
2.3.1 Textural Characteristics of the Soil2.3.2 Saturated Soil Depth; 2.3.3 Water Holding Capacity, Pore Space and Volume Expansion of the Soil (in %); 2.3.3.1 Volumetric Expansion; 2.3.3.2 Water Holding Capacity; 2.3.3.3 of the Soil; 2.3.4 ( varphi ) and Cohesion (c); 2.3.5 Wet Soil Density ( gamma s); 2.4 Conclusion; References; 3 Impact Assessment of Hydrologic Attributes and Slope Instability; Abstract; 3.1 Introduction; 3.2 Climatic Attributes and Landslides; 3.2.1 Study on Rainfall
3.2.1.1 30 Years' Monthly Average Distribution of Rainfall and Assumption of Catastrophic Rainfall (mm) Year3.2.1.2 Yearly Distribution of Rainfall with 3 Years Moving Average Value and Its Relation with Landslide Events; 3.2.2 Evapotranspiration; 3.2.3 Relationship Between Rainfall and Evapotranspiration and Determination of Deficit and Excess Moisture Period; 3.3 Drainage Network Evolution and Landslide; 3.3.1 Drainage Network Analysis of 1972; 3.3.2 Drainage Network Analysis of 1987; 3.3.3 Drainage Concentration and Stream Confluence Point; 3.3.4 Drainage Network Orientation
3.3.5 Drainage Density and Landslide Potentiality3.3.6 Upslope Contributing Area and Landslide Potentiality; 3.4 Drainage Morphometry and Slope Instability; 3.4.1 Determination of Composite Ranking Coefficient Value and Instability Rank; 3.5 Conclusion; References; 4 Surface Run-off, Soil Erosion and Slope Instability; Abstract; 4.1 Introduction; 4.2 Run-off Estimation; 4.2.1 Determination of Runoff Curve Number (RCN); 4.2.1.1 Land Use and Land Treatment; 4.2.1.2 ; 4.2.1.3 Hydrologic Condition; 4.2.1.4 Antecedent Moisture Condition
1.11.2 Landslide Susceptibility Zonation Models Concept1.12 Study on Landslide Management; References; 2 Geo-spatial Variability of Physiographic Parameters and Landslide Potentiality; Abstract; 2.1 Introduction; 2.2 Assessment of Geomorphic Attributes; 2.2.1 Analysis of Contour Orientation; 2.2.2 (DEM); 2.2.3 Hypsometric Analysis; 2.2.4 Lithological Composition and Landslide Potentiality; 2.2.5 Analysis of and Landslide Potentiality; 2.2.6 Slope Angle and Landslide Potentiality; 2.2.7 Slope Aspect and ; 2.2.8 The Surface Curvature and Landslide Potentiality; 2.3 The Soil
2.3.1 Textural Characteristics of the Soil2.3.2 Saturated Soil Depth; 2.3.3 Water Holding Capacity, Pore Space and Volume Expansion of the Soil (in %); 2.3.3.1 Volumetric Expansion; 2.3.3.2 Water Holding Capacity; 2.3.3.3 of the Soil; 2.3.4 ( varphi ) and Cohesion (c); 2.3.5 Wet Soil Density ( gamma s); 2.4 Conclusion; References; 3 Impact Assessment of Hydrologic Attributes and Slope Instability; Abstract; 3.1 Introduction; 3.2 Climatic Attributes and Landslides; 3.2.1 Study on Rainfall
3.2.1.1 30 Years' Monthly Average Distribution of Rainfall and Assumption of Catastrophic Rainfall (mm) Year3.2.1.2 Yearly Distribution of Rainfall with 3 Years Moving Average Value and Its Relation with Landslide Events; 3.2.2 Evapotranspiration; 3.2.3 Relationship Between Rainfall and Evapotranspiration and Determination of Deficit and Excess Moisture Period; 3.3 Drainage Network Evolution and Landslide; 3.3.1 Drainage Network Analysis of 1972; 3.3.2 Drainage Network Analysis of 1987; 3.3.3 Drainage Concentration and Stream Confluence Point; 3.3.4 Drainage Network Orientation
3.3.5 Drainage Density and Landslide Potentiality3.3.6 Upslope Contributing Area and Landslide Potentiality; 3.4 Drainage Morphometry and Slope Instability; 3.4.1 Determination of Composite Ranking Coefficient Value and Instability Rank; 3.5 Conclusion; References; 4 Surface Run-off, Soil Erosion and Slope Instability; Abstract; 4.1 Introduction; 4.2 Run-off Estimation; 4.2.1 Determination of Runoff Curve Number (RCN); 4.2.1.1 Land Use and Land Treatment; 4.2.1.2 ; 4.2.1.3 Hydrologic Condition; 4.2.1.4 Antecedent Moisture Condition