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Estimating Spatial Curve Number For Hydrologic Response Analysis Of A Small Watershed
Estimating Spatial Curve Number For Hydrologic Response Analysis Of A Small Watershed
Journal of Spatial Hydrology
An approach to estimate the curve number (CN) at each pixel unit of a satellite imagery, which is a key parameter in the widely used Soil Conservation Service Curve Number (SCS- CN) hydrologic model, is proposed. Instead of mapping land use and its temporal dynamics from satellite imageries, this approach linearly unmixes the multi-spectral radiances into three fractional layers which primarily control the degree of saturation within a watershed occurring due to a 25 cm-depth storm event, i.e., physically interpreted as the CN. The fraction layers used are water, sand and pure vegetation. In order to obtain a relationship between …
Selection Of Site For Small Hydel Using Gis In The Himalayan Region Of India
Selection Of Site For Small Hydel Using Gis In The Himalayan Region Of India
Journal of Spatial Hydrology
The choice of site for small hydro in the inaccessible tracts of Himalayan region is a difficult task by the conventional methods. This leads to a considerable loss of time and money in selecting a proper site for small hydel. In this paper an attempt has been made to use GIS and Remote Sensing technology to arrive at various alternative sites available in the study area and finally to select the most technically suitable site. The Soil Conservation Service (SCS) Curve Number (CN) method has been utilized to identify the monthly average runoff of the site. The distributed curve number …