Runoff Simulation in Small Agricultural Watershed of Vertic Inceptisols of Indian Soils

概要

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A major part of the semi-arid area in India has the Vertic Inceptisols soils. These soils are shallow, located on lands exceeding 2% slope, and hence quite prone to the soil erosion. The crop productivity in these soils is affected by less amount of water available to the plants and because of severe loss of the soil during the heavy storms. A runoff simulation model is developed particularly for the Vertic Inceptisol soils, which is relatively simple in concept and requires a reasonable amount of data. The developed model integrates the hydrological processes of evapotranspiration, and soil moisture redistribution and predicts seasonal runoff, soil moisture storage, and deep percolation on a daily basis. In the developed model, the retention parameter is calculated based on the soil moisture accounting procedure, and the deep percolation is estimated on the basis of time delay factor. The model is validated against the measured data from the Vertic Inceptisol fields. The runoff predicted by the model matches well to the observed runoff from the small agricultural watershed.
日本雨水資源化システム学会の論文