regional frequency analysis

7/31/2019 regional frequency analysis

1/22


2/22


3/22


4/22


5/22


6/22


7/22


8/22


9/22


10/22


11/22


12/22


13/22


14/22


15/22


16/22

1 0 2 W

1 0 2 W

1 0 0 W

1 0 0 W

98W

98W

9 6 W

9 6 W

9 4 W

9 4 W

3 2 N 3 2 N

3 4 N 3 4 N

3 6 N 3 6 N

3 8 N 3 8 N


17/22

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

50 60 70 80 90

(a) 1-Hour Precipitation

2-year10-year

Z j (

p )

Year

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

50 60 70 80 90

(b) 24-Hour Precipitation

2-year10-year

Z j ( p

)

Year


18/22

-0.4

-0.2

0

0.2

0.4

0.6

0 100 200 300 400 500 600 700 800

24-Hour Precipitation

C o r r e l a t

i o n

C o e f

f i c i e n t

In tersite Distance (km )

0.8

1.2

1.6

2

2.4

0 5 10 15 20 25 30 35 40

10-Year 24-H our Precipitation

S k ( 0

. 1 )

k

N o Intersite Correla ti on

Logari th mic Correla ti on Model

Smax

Smi n


19/22

0.8

1

1.2

1.4

1.6

1.8

2

50 60 70 80 90

10-Year 24-H our Precipitation

Z j (

0 . 1 )

Year

0.1

0.15

0.2

0.25

0.3

949596979899100101102

1-H our Precipitation

L - C

V

Lon gitude ( W )


20/22

1

1.2

1.4

1.6

1.8

2

2.2

0 5 10 15 20 25 30 35 40

10-Year 1-Hour Precipitation

S k ( 0

. 1 )

k

H omogeneous Regi on

Regiona l H eterogeneit y

Smax

Smi n

0

5

10

15

20

25

30

35

1 2 3 6 12 24 48 72

Annual Maxima Averages

N u m

b e r

Duration (hours)

N umber of day s per yearwith an a nnual maximum

Ma ximum number per yea r of a nnua l maxima i n a single da y


21/22

15

20

25

30

35

40

45

1950 1960 1970 1980 1990

Annual Precipitation

P r e c i p

i t a t

i o n

( i n

)

Year

0

1

2

3

4

5

Ja n Feb Mar Apr May Jun Jul Aug Sep O ct N ov Dec

Southern Plains

Average1952

1956

P r e c i p

i t a t

i o n

( i n c h e s

)

Month


22/22

0.5

0.6

0.7

0.8

0.9

1

1.1

1.2

1.3

20 25 30 35 40 45

24-Hour Precipitation

Z j (

0 . 5 )

Annual Precipitation (in )

regional frequency analysis

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