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Bank Erosion

Bank Erosion. SARADA MANDAL Associate Professor in Geography Teacher-in-Charge PRABHU JAGATBANDHU COLLEGE ANDUL, HOWRAH. Hydraulic Geometry. Formula given by Leopold and Moddack in 1953 : Q = WDV Q= Quantity of water W= Width of the channel D= Depth of the flow V= Velocity of water.

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Bank Erosion

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  1. Bank Erosion SARADA MANDAL Associate Professor in Geography Teacher-in-Charge PRABHU JAGATBANDHU COLLEGE ANDUL, HOWRAH

  2. Hydraulic Geometry • Formula given by Leopold and Moddack in 1953 : Q = WDV • Q= Quantity of water • W= Width of the channel • D= Depth of the flow • V= Velocity of water

  3. Factors of Bank Erosion • Fluctuation in quantity and volume of water • Sediment load • Characteristics of bank material • Distortion of equilibrium in soil water • Meandering of channel • Nature of the drainage basin (e.g. underlying structure, nature of rainfall, nature of weathering etc.) • Braiding of channel • Characteristics of soil profile • Human action

  4. Damage in West Bengal due to Bank Erosion Maldaha

  5. Damage in West Bengal due to Bank Erosion Maldaha

  6. Damage in West Bengal due to Bank ErosionMurshidabad

  7. Damage in West Bengal due to Bank ErosionMurshidabad

  8. Mapping of Bank Erosion 1) Superimposition of the same channel-section for two separate time-period a) Identification of locations of area of erosion and deposition along the left bank and right bank b) Calculation of length of erosion c) Calculation of area of erosion d) Calculation of volume of erosion e) Calculation of rate of erosion per year

  9. Mapping of Bank Erosion 2) Mapping from cadastral map 3) Mapping from topographical sheet 4) Mapping by Prismatic Compass Survey 5) Thematic map by showing loss and damages 6) Mapping by showing bank-material, process of erosion and level of erosion

  10. THANK YOU

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