wind power gis analysis

7/24/2019 Wind Power Gis Analysis

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Gianni Gorgoglione

Wind Power

IntroductionWind power is one of the most environmental friendly sources of energy possible, since it is renewable

and has no emission of greenhouse gases. As a part of becoming more environmental friendly and less

dependent on fossil energy sources the region of Skne is planning on building a wind park.

Objective

The community planners of Skne need to know the best possible place to build this wind park.

So our objective in this exercise is to find this site. At the same time we aim to improve our skills in

working with vector and raster data, doing spatial analyses and to learn how to work with new

commands like viewshed.

DataFile name File type and ref. system Content

Cover Raster, IDRISI, RT90, 2.5 gon V Land cover

Roads Vector, IDRISI, RT90, 2.5 gon V Roads

Houses Vector, IDRISI, RT90, 2.5 gon V Buildings

2d6b Vector, IDRISI, RT90, 2.5 gon V Digital elevation data

G2D5a, G2D5b, G2D6a ArcInfo (ESRI) GRID ASCII format, 2.5 gon V Digital elevation data 50m res.

To Vector, ESRI shape format, RT90, 2.5 gon V Built-up areas covering study area

Windfreq Attribute table, ASCII, IDRISI Freq. Index for wind directions

Coverh Attribute table, ASCII, IDRISI Heights of land cover types

Table 1: Name, file type, reference system and content of used data in this exercise

Methodology

To find the best possible location for a wind park have to take into account a lot of different factors. The

main criteria are as follows:

-

A power plant should be located at least 500m from any building or built up area.

-

A power plant should be located at least 200m from any tarmac road

-

A power plant cannot be located in a forest or lake.

-

A possible location should have an as high as possible potential wind energy. An index called

Potential Wind Power power is introduced to express this potential wind energy. Preferably

this index has to have a value of least 6.

-

A power plant location should have a minimal area of 4 ha

For the first three criteria it is best to create a buffer around the targets. Then for each map the area

outside the buffer is suitable to build a wind park in. If we combine these three restrictions to one map

we obtain a map excluding all areas which have local planning restrictions.

For the potential wind energy criterion we have to start by calculating the aspect from the DEM

(combined out of 4 smaller maps, hence 5a/b and 6a/6b) for the whole region. With the aspect we can

classify a wind sector for every slope. For each sector there is a different wind frequency, since the wind


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Roads (v)

Houses (v)

Raster/Vector

Bufferzone

reclass

Roads (r)

Houses (r)

Cover (r) reclassCover (r)

Water +Forest = 0

Anything else = 1

Map

suitablelanduse

PWI and Landuse

suitable

Image

calculat

or

Multip.

Image

calculat

or

Multip.

Info. Area

suitable /

unsuitable

in [ha]

Group

suitable

groups

Area

Area suitable

groups

reclasssuitable

groups

with min. Areas

Group

Number of

sutiable groups

(0-13)

Extract

Map with

PWI

Map PWI suitable

groupsExtract

Best group for a

wind power plant

Map with

PWI suitable

Flowchart 2: Creating the map with best location

G2dAll

(Raster)

Elevation

overlay

Best group

viewshedView of

Wind park

House

(Raster)

Image

calcul

ator

Houses in

view of

Wind park

areaInformation

about cells

Cover

object

height

Assign

Cover

Field info.

Elevation

object + height

(First+Second)

Flowchart 3: Viewshed analysis


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Results


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wind power gis analysis

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