Note: This document is for an older version of GRASS GIS that has been discontinued. You should upgrade, and read the current manual page.
NAME
r.green.hydro.optimal - Detect the position of the potential hydropower plants that can produce the highest possible power
KEYWORDS
raster
SYNOPSIS
r.green.hydro.optimal
r.green.hydro.optimal --help
r.green.hydro.optimal [-dc] elevation=name discharge=name river=name len_plant=float len_min=float distance=float [p_max=float] p_min=float output_plant=name [output_point=name] efficiency=float [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- -d
- Debug with intermediate maps
- -c
- Clean vector lines
- --overwrite
- Allow output files to overwrite existing files
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- elevation=name [required]
- Name of input elevation raster map
- discharge=name [required]
- Name of river discharge [m^3/s]
- Name of input raster map
- river=name [required]
- Name of vector map with interested segments of rivers
- Or data source for direct OGR access
- len_plant=float [required]
- Maximum length of the plant [m]
- Default: 10000
- len_min=float [required]
- Minimum length of the plant [m]
- Default: 10
- distance=float [required]
- Minimum distance among plants [m]
- Default: 0.5
- p_max=float
- Maximum mean power [kW]
- p_min=float [required]
- Minimum mean power [kW]
- Default: 10.0
- output_plant=name [required]
- Name of output vector map with potential power for each river segment [kW]
- Name for output vector map
- output_point=name
- Name of output vector map with potential power intakes and restitution [kW]
- Name for output vector map
- efficiency=float [required]
- Efficiency [-]
- Default: 1
r.green.hydro.optimal detects the position of the potential hydropower plants that can produce the highest possible power. Deciding the range of plant length and the distance between plants, the module returns two vector maps with the segments of rivers exploited by the potential plants and with the intakes and restitution of these plants. The module computes the potential plants in order to maximize the power that can be produced.
The three input files are the rivers considered (vector), the discharge for each point of this river (raster) and the elevation raster map to calculate the gross head.
The power is defined as:
P=η * ρ * g * Q * Δh
where η is the efficiency of the plant
ρ the density of water (1000 kg/m3)
g the gravity term (9,81 m/s2)
Q the discharge of the river
Δh the gross head of the considered segment
The module maximizes the power over a given range by a brute-force search in order to examine all possible arrangements of Q and Δh. Thus, the potential segments can be shorter than the maximum plant length chosen because it depends on the maximization of the product Q * Δh.
For each potential segment, the potential power is given in kW in attribute.
This example is based on the case-study of Gesso and Vermenagna valleys in the Natural Park of the Maritime Alps, Piedmont, Italy.
Here is the vector file availablestreams of the interested streams in which we want to compute the potential hydropower plants. The river segments already exploited by an existing plant do not appear in the file.
Input vector map availablestreams
The following command computes the potential plants for a plant length range from 10 to 800 m and a distance between plants of 800 m :
r.green.hydro.optimal
discharge=discharge
river=availablestreams
elevation=elevation
len_plant=800
distance=800
output_plant=potentialsegments
output_point=potentialpoints
d.vect map= potentialpoints color=red
d.vect map= potentialplants color=blue
The output vector maps are shown in the following picture which gathers the potential segments vector map (potentialplants, in blue) and the potential intakes and restitution vector map (potentialpoints, in red)
Output vector maps potentialplants (in blue) and potentialpoints (in red)
r.green.hydro.discharge
r.green.hydro.delplants
r.green.hydro.theoretical
r.green.hydro.recommended
r.green.hydro.structure
r.green.hydro.technical
r.green.hydro.financial
Giulia Garegnani (Eurac Research, Bolzano, Italy), Manual written by Julie Gros.
SOURCE CODE
Available at:
r.green.hydro.optimal source code
(history)
Latest change: Monday Jun 24 15:24:04 2024 in commit: ed8af2507854cdbc4ca37087dd43927d6329c0d4
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GRASS Development Team,
GRASS GIS 8.3.3dev Reference Manual