Campbell 21X Manual do Operador descarregar pdf (Página 123)

SECTION 11.

OUTPUT

PROCESSING

INSTRUCTIONS

There are

three

Output

Options,

which

specify

the values

calculated.

Option 0:

Mean

horizontalwind

speed,

S.

Unit

vector

mean wind direction,

@1.

Standard deviation

of

wind

direction,

o(@1).

Standard

deviation

is

calculated

using

the

Yamartino

algorithm. This

option

complies

with EPA

guidelines

for

use

with

straight-line

Gaussian

dispersion

models to modelplume

transport.

Option

1:

Mean horizontalwind

speed,

S.

Unit

vector

mean

wind direction.

@1.

Option 2:

Mean horizontalwind

speed,

S.

Resultant mean

wind speed, U.

Resultant mean wind

direction, @u.

Standard deviation

of

wind

direction,

o(@u).

This standard deviation is calculated

using

Campbell Scientific's wind

speed weighted

algorithm.

Use of the Resultant

mean

horizontalwind

direction is not

recommended for

straight-

line Gaussian

dispersion

models,

but may

be used to modeltransport

direction in

a

variable-trajectory

model.

Measured raw

data:

Si

=

horizontal

wind

speed

@i

=

horizontal

wind

direction

Ue;

=

s651-*est

component of wind

Un;=

n916-south

component of wind

N

=

number

of

samples

Calculations:

Scalar

mean

horizontalwind

speed,

S:

S=(>si)/N

where

in the case

of orthogonal

sensors:

S,=(Ue,2+Un;2)1/2

Unit

vector mean wind

direction.

@1:

where

Ux=(Xsin

@;)/N

Uy=(Xcos

O;)/N

or, in

the

case

of orthogonal

sensors

Ux=(x(Ue;/U;))/N

Uy=(E(Un/Ui))/N

where

U,=1Ue,2+Un,2)

1

/2

Standard deviation

of wind direction,

o(@1),

using Yamartino algorithm:

o(@1)=61s

sin(e)[1 +0.1 547

e3l

where,

s=[

1

-

((

U

x)2+

(Uyyzylt

rz

and Ux and Uy are as defined above.

Resultant mean horizontalwind

speed, U:

U=(Ue2+Un211/2

where for

polar

sensors:

Ug=(XS;Sin

@;)/N

1Jn=(XS;Cos

@;)/N

or,

in

the case

of

orthogonal sensors:

us=(XUei)/N

Un=(tUn,)/N

Resultant mean wind

direction, @u:

@u=Arctan

(Ue/Un)

Standard

deviation

of wind

direction, o(@u),

using Campbell Scientific

algorithm:

o(@u)=9111-U/S1trz

T**

70

SAMPLE

***

FUNCTION

This instruction stores

the

value from

each

specified

input

location.

PAR. DATA

NO.

TYPE

DESCRIPTION

01: 2 Repetitions

02: 4 Starting input

location

no.

Outputs

generated:

1 for

each

sample

11-2

01=Arctan

(Ux/Uy)

1 2 ... 118 119 120 121 122 123 124 125 126 127 128 ... 190 191

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