Sediment Delivery Ratio

Sediment yield and sediment delivery ratio at sub-watershed level (5D1A5c) was estimated using ArcGIS interface and ArcSWAT model. 20 m Digital Elevation Model (DEM) has been prepared using 20 m contours, elevation points and watershed boundary of study area. A supervised classification technique was used to classify the land cover of study area. The collected daily weather data for 30 years (1986-2015) were used to prepare the weather database details. The estimated soil properties and land cover properties were used to prepare the soil database and plant growth database details. The model was calibrated using standard USLE_P values for cross-sloped cultivated lands. Sediment yield was simulated as 22.78 tons/ha./year while gross sediment loading of 34.61 tons/ha./year. The sediment samples for 12 rainfall event during 3 years (2013-15) using homemade sediment samplers were collected at the watershed outlet. The sediment concentrations of collected samples were compared with simulated sediment concentration from SWAT in order to validate the calibrated SWAT model.

Autorentext

Arun Lakkad, Ph. D. (ingénierie des sols et de l'eau), professeur adjoint, Collège d'ingénierie et de technologie agricoles, Université agricole de Navsari, Dediapada, Gujarat, Inde.