watershed delineation for hydropower project
Post on 16-Mar-2016
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DESCRIPTIONWatershed delineation to propose Hydropower project
Watershed delineation to propose a hydropower project in Shoghor-Chitral Aamir Zaman
Kerosene oil till 80s
1990 Micro Hydel Projects (AKRSP)
ObjectivePurpose of our analysis was to calculate watershed delineation to
propose a suitable site for a hydropower project.
ArcGIS - Arc Hydro
Data Elevation Model
Regional Geological and Tectonic Setting
Site Stratigraphic Information
Metamorphic Chitral Slate (Slates, Phyllite, Siltstone)
Tectonically Less active
ACQUISITION OF POINT DATA
Set up ARCGIS working environment
Why we choose 10m DEM? 30m DEM generally flows
within the valley but deviates from actual channel location.
10m DEM produce much realistic flow paths that follow the channels.
The Fill sinks operation removes local depressions from a DEM by replacing these local depressions by flat areas in the output DEM.
Depressions that consist of a single pixel.
Find a sink that consists of a single pixel (pixel in red).
Assign to this pixel, the smallest value found among its 8 neighbor pixels (pixel in green).
Depressions that consist of multiple pixels.
outlet for this depression is determined.
the height values of this depression will be increased to the smallest height value of a pixel.
that is adjacent to the outlet for this depression/sink, and that would contribute to the initial sink
Pixels at the border of the map are never changed.
Flow direction operation determines into which neighboring pixel any water in a central pixel will flow. Flow direction is calculated for every
central pixel in input blocks of 3 by 3 pixels, each time comparing the value of the central pixel with the value of its 8 neighboring pixels.
The output map contains flow directions as N (to the North), NE (to the North East), etc.
The Flow accumulation operation determines the number of pixels that naturally drain into outlets.
The output map contains cumulative hydrologic flow values that represent the number of input pixels which contribute any water to the outlets (or sinks if these have not been removed).
Result of Flow accumulation. Result of Flow accumulation when Fill sinks is not used.
Stream networks are delineated from a digital elevation model (DEM) using the output from the Flow Accumulation function.
Flow accumulation in its simplest form is the number of upslope cells that flow into each cell.
The Stream Link function allows you to assign unique values to each of the links in a raster linear network.
Flow direction and stream link are use to delineate watershed.
Large amount of glacial water wasted.
Area is also in Energy crises.
Foundation conditions are favorable for construction of the hydropower projects
Pouring point of whole area is in SHOGHOR.
Hydro power potential of this river is modest but it can fulfill the needs of the locals.