ML20235B522

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Rept on Meteorological Conditions at Bodega Head & Bodega Bay
ML20235B522
Person / Time
Site: 05000000, Bodega Bay
Issue date: 06/04/1962
From: Eberly D, Robinson L
PACIFIC GAS & ELECTRIC CO.
To:
Shared Package
ML20234A767 List: ... further results
References
FOIA-85-665 NUDOCS 8709240131
Download: ML20235B522 (29)
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Text

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t REPORT ON 12lTEOROLOGICAL CONDITIONS AT . BODEGA IEAD AND 'BCDEGA BAY i

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s D. L. Eberly

., L. B. Robinson

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June 4, 1962 METEOROLOGICAL OFFICE

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PACIFIC GAS AND $;IECTRIC CCEPANY s .

0709240131 851217 PDR FOIA FIRESTO85-665 PDR

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. ,w Appendix III '

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- ~ TABLE OF CONTENTS ,

PAGE i

I r

List'of Tables;..................................'..................... 1 i TEXT OF REPORT J

I. 14 CATION.......................................'................. 2 ,

II. TOP 0 GRAPHY...................................................... 2  :

1 III. AVAILABLE METEOROLOGICAL DATA................................... 3 l

IV. METEOROLOGICAL CONDITIONS....................................... 3

1. Two Climatic Regimes................................... 3
2. Surface Winds.......................................... 3 3.

~

Precipitation.......................................... 4

[]' 4. Surface Dry Bulb' Temperature........................... 5 ,

5. Surface Wet, Bulb Temperature............................ 5
6. Sky Cover and ceiling Heights........................... 5 V. DIFFUSION CLIMATOLOGY............................................ 6
1. Related Studies......................................... 6 -
2. Meteorological Inf6rmation for Diffusion Calculations... 7 4

I

3. Me t e or ological Pr ogram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . '8 VI.

SUMMARY

.................,........................................ 8

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Appendix III

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. 1 LIST OF TABLES PAGE

1. WIND FEQENCES AT POINT REIES, 3,626 OBSERVATIONS, 1938-41, .

9 WET S!MSON.

2. WIND FEQUENCES AT POINT REES, 4,042 OBSERVATIONS, 1938-41, 1.0 DRY SEASON.

3 WIND FREQUENCES AT POINT REYES, 9,181 OBSERVATIONS, 1938-41, ANNUAL. H

4. FASTEST MIIE OF WIND RECORDED AT POINT EES. 12
5. PRECIPITATION FOR FORT ROSS, CALIFORNIA. 13
6. EAN NUMBER OF DAYS WITH PRECIPITATION AT POINT EYES. 14 7.

DURATION AND FEQUENCY OF VARIOUS INTENSITES OF PRECIPITATION FOR POINT REYES. 15

8. TEMPERATURES FOR POINT EYES,' CALIFORNIA.. 16
9. MEAN WET BULB TEMPERATURES AT FORT BRAGG (*F). 17
10. EAN ET BUIB TEMPERATURES FOR DIFFEENT TDFJ OF DAY AT FORT BRAGG. 18
11. SKY CONDITIONS AT JENNER, CALIFORNIA. 19
12. FEQUENCY OF VARIOUS CEILING IEIGHTS AT JENNER, CALIFORNIA. 20
13. FELIMD/ARY ESTIMATES OF FREQUENCY OF 16 WIND DIECTIONS, ANNUAL BASIS:

FREQUENCY OF STABILITY FOR EACH DIECTION, AND AVERAGE VELOCITY FOR EACH DIRECTION AND STABILITY CLASS. 21

14. DIFFUSION COEFFICIENTS. 22
15. EAN TEMPERATURE SOUNDINGS AT DAKIAND AT 1600PST FOR 50 SUMMER DAYS, 1957-1958. 23
16. PREVALENCE OF LIGHT AND VARIABLE CIRCULATION PATTERNS IN THE SAN FRANCISCO BAY AREA, 1952-1955 24 )

l

17. REPORTING POINTS USED IN SAN FRANCISCO BAY AREA WIND FLOW STUDY 25 .
18.  !

500 METER RAWINS WHEN PRECIPITATION OCCURRED AT SURFACE, OAKLAND, Jan. 1948-Dec. 1952 26 t m

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'l l Appendix III j q 4 L; a I. IOCATION <

The proposed' plant location is on Bodega Head, an crosion resistant outcyop about 46 air, miles NNW of the Golden Gato. '

r.C. TOPOGRAPHL t Frox Cape 1.*endocis 220 miles NNW of Bodt ga' Head to Point Conception -

300 miles' SWof Pcdoga Head, the coastline hca an average NNW-SSE orientation., Bodegi 7ead' prcjocts from this coastline due Southward into

.the Deean for about/3 miles.- The Head itnif varies in width fromi to -

It miles. Doran Peach, a narrow sandspit, curves out almost due West from the ocastline and ~nearly touches the tip of Podega Head, thus forming Bcdega Harbor with its m ghly triangular shape.

4he plant site is a saddle, presently about 90 feet above sea level formed between a hill 200 feet high 0.2 nile to the SSE a'id a hill 238 feet high, about 0.4 mile to the NNW. Th:.geoutherly hill. forms the very end '

/ of Bodegd Head. . ! The northerly hill is followed by another, 266 feet high, c

abru'e Od tue from the site.

5

' ~. e DorsnBeacdsepare.tesBodegaHarborfromBotIagaBly. Bodega 1187 itself- '

is little more than open coastline extending about 8 r,12es Southward ofs Dvsn i the San

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Beach Andreasto Tomales fault to lfon? P&&

the long, Thenarrow coastline is cleftcontaining indentet1% ut this point To by' e malay. s B t >e t .

The coastine to the North a9 ' South,p jan? in the vicidity of Bodere Bay anti Barbor rises almost imedinaly in a s,omplex series of rolling hilh. l These are generally between 400 to 1,'000 feet )high. Higher elotations occur 10 to 15 miles to the NE where the coast range again appears. ,

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, Three watercourses run thrd;gh the hills in the vicinity 'of Boddga Harbor and Bay. Salmon Cred. reaches the &ean about 3 milcs due North of.

the plant' site, Cheney Guled ynters Bodegi l! arbor about it milis JS of the ,

plant site, and Eatero Amer:;.spo lies 3 milera to the ESE in P,$ega Bay. I k

Some beeings and diste4es oc2 the plant site to nearby towns and terrain features of interest as J '

j Bearine Distance .

I Town of Salmui Creek )

357' 3 2 milss.

Town of Bodega %y 179 2.1 miles Tnun of Bodega 58' 5.6 miles Town of Valley Mrd '

82' . ,. 7.4 miles Town of Tomab s I- , 115' t t 9.4 miles

+

Town of l'illon ~Be?.ch ,

125' '

6,3 miles ,' l Irith E111, 863 feet l' 4 5 miles '

' /

Mount Roscoe, 616 feet 17'

,)

> 2.9 miles 1

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& r.AR:..i%iw%a@.ls.iliiad xinaML&Wisuk.&%s.W&&:nk dsid:M w :l F ,

I Appendix III l 1

O .J III. AVAIIABLE METEOROLOGICAL DATA lev observations on an' hourly or synoptic basis appear to have been l j

made in the vicinity of Bodega Bay. ' '

A sample of 9,181 wind observations covering somewhat less than 4 years of the period from 1938 to 1941 is available for Point Reyes. The wind observations frcm this exposed coastal location, about 22 miles South of l 1

Bodega Head, appear to be the closest representative vind record.

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l About If years of hourly aviation observations were made at Jenner.

during World War II. They provide information on sky condition and ceiling heights. Jenner is a coastal location about 12 miles NNW of Bodega Head.

Climatological stations with once-a-day observations of ' maximum and minimum temperature and precipitation are plentiful in the vicinity. There ap; ear to be about 10. i IV. )ETEORCLOGICAL CONDITIONS

1. TWO CLIMATIC PSGIFES It has.been previously suggested that California's venther 3 can be realistically described by using a wet season and a dry season. The months November through March make up the wet season, and the months May through September comprise the dry season. April and Cbtober, which are considered to be tran- -

sitional months, have'been omitted from any seasonal treatment of the data. '

2. SURFACE VINDS A sample of 9,181 vind observations from 1938 to 1941 was 1

l taken 4 miles east of Point Reyes Lighthouse. Prior to this period, a limited sum =ary for a 31-year record taken at the lighthouse exists. It has been used to provide information on env h m vind.

Observations for the 38-41 record were mede to 16 points of the compass. Examination of the summaries revealed an obvious observer bias in favor of the primary directions. This bias has been removed by a method suggested by Ratner.* s i'

Tables 1, 2, and 3 summeize the results for the vet season, dry season, and year respectively. {

s Ratner, Benjamin "A Method for Eliminating Directional Bias in Wind Roses", Monthly Weather Reviev,1950.

.= * .

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,- 1 Appendix III

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.J 2. SURFACE WINDS (Cont'd)  !

1 Edinger

  • investigated the manner in which. terrain and j thermal stratification influence the air flow across the  !

California coast during the summer. He concluded "the mean I wind field below the top of the inversion at Oakland is an ocean toward continent summer monsoon arriving at the coast from the northwest...'. This ' northwest onshore monsoon

  • shows clearly as a near doubling of frequency of NW direction during the, dry season. Even in the wet season, however, the prevailing wind is northwesterly.

It seems incorrect to describe as calm the relatively high

, percentage of speeds in the O to 3 mph class. It is probable that no more than 1/h of these cases were actual calms.

Table h summarizes the fastest mile of, wind by month. $

j When the wind data were taken at the highly exposed western point of Point Reyes, very high velocities (up to 91 MPH) were l recorded. Although these maximum velocities will be somewhat lower at Bodega Head, it is an indication of what could be expected just offshcre.

3. PRECIPITATION i

The long-term precipitation record at Fort Ross has been '

used for average monthly and record monthly rainfall amounts, .

Table 5. It is estimated that Bodega Bay will receive from 10 to 20 percent less rainfall on the average than does Fort Ross. '

This would be due to the more southerly location of Bodega Bay, '

and a natural enhancement of the catch at Fort Ross due to the gage location. This is described as an ocean exposure at 11h feet elevation, i mile west of base of 1500 foot mountains.**

The average annual precipitation at Bodega Bay is estimated to be 35 inches. Annual precipitation is expected to range from  ;

i a low of 15 inches for dry years and a high of 80 inches in the I wettest years.

The mean number of days with precipitation, and the duration and frequency of various intensities are sunmarized for Point Reyes in Tables 6 and 7. This data is representative of the

. plant site.

I I

1 l

4 Edinger, James G. "The Influence of Terrain and Thernal Stratification on Flow Across the California Co'astline n, UCLA, Dept. of Meteorology, AF 19 (60h)-5212

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p App 2ndix III C '

4. DRY BULB TFERATUE Dry bulb temperature measurements representative of Bodega.

Bey are available for Foint Reyes and Jenner. A su mary of Point Reyes temperature (Table 8) was used because of the longer record; however, there was close agreement between the values observed at the two stations. -

The annual mean temperature at Foint Reyes is 52 5'F. The influence of the ocean on coastal temperatures results!.in-a small range in temperature. This is best demonstrated by com-paring the average temperature for the vet season (51.1*F) and the dry season (53 7'F). Also, the annual range of average monthly temperatures is only 7'F. Furthermore, the daily range in temperature is en11, varying 8 to 10 degrees on the average.

Cool seabreezes restrain daytime temperature rises through the summer months. The record high temperature of 91*F occurred in September, which is'normally the varmest month of the year.

5. SURFACE WET BULB TURRATUES The vet bulb temperatures taken at Fert Bragg have been used to represent the cooling to expect from evaporation at Bodega Bay.

q Table 9 is a summary of the mean vet bulb temperatures by month. Table 10 is a summary of the mean monthly vet bulb temperatures for different times of the day. The range of vet bulb temperatures from morning to afternoon is only 7.8*F on the average.

6. SKY CONDITIONS & CEILING EIGHTS Hourly observations of sky condition taken at Jenner, and based on a It year record, are summnvized for the vet and dry j season. Sky conditions will vary greatly from year to year, but i the frequency of various ceiling heights should be fairly representative of the long-term conditions at the plant site.

Tablos 11 and 12 describe the sky conditions and ceilings and allow the following statements to be made

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a. Iov overcast (or high fog) occurs about 44% of the ,

time during the dry season as opposed to only 28% I of the time during the vet season.

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b. The base of the low cloudiness is less ttian 450 feet I 34% of the time at Jenner.

) I NOTE: A cri1%g eyists when more than one-half of the sky is covered with clouds. ~

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Appsndix III ,

', V. DIFFUSION CLIMATOLOGY i

1. RELATED STUDIES Besides the data developed in this report, several other studies contain information of value for describing a diffusion climatology around Bodega Head.

Three of these are:

(1) "A Survey of Air Flow Patterns in the San Francisco Bay Region, 1952-1955", preliminary report, March 1,1957, by C. L. Smalley, Meteorologist, U. S. Weather Bureau.

(2) " Diffusion and Engineering Climatology for the Berkeley Radiation Laboratory", preliminary report, December 1953, by P. A. Humphreys and E. M.

Wilkins, Scientific Services U. S. Weather Bureau.

(3) "Ihe Influence of Terrain and Thermal Stratification on Flow Across the California Coastline," UCLA, Department of Meteorology, 30 November 1960.

by James G. Edinger.

Smalley classified air flow patterns in the Bay Area for the California State Civil Defense Agency for the years 1952 through 1955. Thirty-three stations were used, ranging from Santa Rosa and Point Reyes in the northwest to San Jose and Mount Hamilton in the southeast. For the four year period 1952-1955, charts were classified four times a day according to eight basic types, each type with several subtypes. Frequencies of occurrence of each

g type were tabulated by time of day, 0400, 1000, 1600, and 2200 PST, and by month. The eight basic types correspond to the eight compass directions.

In addition, a light and variable type and an unclassified " type" are given.

Table 16 from Smalley's report shows the diurnal and seasonal frequency of the " light and variable" type. Table 17 lists the stations used in developing the system. Even though largely subjective, the typing scheme provides a valuable summary of the knowledge of air flow patterns of an experienced fore-caster.

Humphreys and Wilkins analyzed five years of Oakland radiosonde and ,

ravindsonde data. They developed 55 separate wind roses for the surface and '

500 meter levels, as well as the frequencies of 4 types of vertical temperature profile in the first 2000 feet. Table 18, based on a summary from their report, gives the frequencies of wind directions and speeds at 500 meters when pre-cipitation occurred at Oakland.

Edinger investigated 50 days in the summers of 1957 and 1958 with strong inversions in the 1600 PST Oakland radiosonde. The days were classified according to the wind direction at the 3KM level and two groups chosen, a southerly one consisting of 27 days having winds in the sector 164'-204', and a westerly one consisting of 23 days having winds in the 233'-299'. sector.  ;

Table 15 summarizes the mean soundings for both groups of data for 1600 PST.  !

An interesting feature in the superadiabic lapse rate from the surface to the inversion base; for both groups about twice the dry adiabatic. Edinger l

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m g g 2 . n y m L W M w w e r , ,; D . % d M m :Jk + '4%2pmt.nw% ~ a un 1

, b. l Appendix III also gives time hodographs of diurnal variations of the winds at Oakland up to 6KM for the same days at 0400, 1000, 1600, and 2200 PST. These show that in the superadiabatic layer, 1600 PST is also the time of the strongest north-westerly flow. It is apparent that air from the West-Northwest and Northwest reaching Oakland at the time of peak onshore flow under a strong summertime inversion is being very well mixed.

2. METEOROLOGICAL INFORMATION FOR DIFFUSION CALCULATIONS In " Meteorology and Atomic Energy" equation 4.76 is given as a special application of Sutton's theory for calculating the average annual dose.

Differences of opinion exist as to the value of diffusion calculations based l on this equation. In applying it to Bodega Head, there are some uncertainties about both the form of the equation and estimates, derived from a diffusion clicctology, of the parameters in the equation. These exist because the field of turbulence in the region of Bodega Head is not uniform in time or space -

particularly in the vertical, and is not well-observed in time or space -

particularly in the vertical. Nevertheless since the aim of a diffusion

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climatology whould be to aid in the estimation of diffusion from meteorological j data, it was felt useful to develop information :(Tables 13 and 14) that will '

allow calculation of the average annual dose.

Table 13 gives the frequency distribution of wind according to direction, the frequency of stable and unstable conditions associated with each direction, and the average velocity associated with each stability class. The frequency

/_1 distribution of direction is identf cal with the Annual Point Reyes Wind Frequencies, Table 3. The stability information has to be described as a rough estimate. It was estimated from atmospheric soundings made at Arcata ,

using the assumption that the surface layer below the non-surface based in- '

version is turbulent. The use of these data is discussed in the " Final Hazards Summary Report", Humboldt Bay Power Plant, Appendix I, pages 14-16.

The diffusion coefficients listed in Table 14 were arrived at after surveying the values reported in all available sources, including " Meteorology and Atomic Energy" and the several meteorological journals, and considering the )

effects of terrain and ocean. There is further discussion of these coefficients in the " Final Hazards Summary Report, Humboldt Bay Power Plant, Appendix 1." ,

The values listed in Table 14 are consistent with those recommended for Humboldt Bay.

A more practical technique for estimating the distribution of concen-trations has been de.veloped by Pasquill,* described by Meade,** and formulated in more conventional terms by Gifford.*** It takes into account such factors as the effect of a stable Myer aloft on the rate of vertical spread, the change in the trajectory of the release, and the ef fect of a built-up area on the release. Application of this recommended method will become feasible

  • F. Pasquill, " Atmospheric Diffusion", Chapter 5, pages 204-214
    • P. J. Meade, " Meteorological Aspects of the Peaceful Uses of Atomic Energy", Technical Note No. 33, World Meteorological Organization

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F. Gifford, "The Problem of Forecasting Dispersion in the Lower Atmosphere",

Weather Bureau, Research Station, Oak Ridge, Tennessee

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p Appandix III I

. with the commencement of on-site observations, since more information is (s,' .) - required than is given in Tables 13 and 14.

.3. . METEOROLOGICAL PROGRAM .

The'first on-site measurements should become available this fall with

~

the completion of a 250 foot meteorological tower, 3 years in advance of '

plant operation. An intensive data acquisition program is planned with 3 levels of wind and temperature instrumentation at 7 feet, 50 feet, and the

- top. Tower construction is such that instrument levels could be spaced every

. 50 feet if warranted. To handle the high volume of data that will be generated, l all readings will be digitized and recorded on paper tape.

l The tower will also serve for elevated release of smoke or other tracers. '1 Physical interpretation of special studies of this sort will, of course, J require the tower meteorolo8i cal observations.

VI.

SUMMARY

I Sutton-type calculations' provide a useful preliminary estimate of con-centrations of ionizing radiations. With appropriate stack height and plant design, no radioactive air pollution problems are presently anticipated.

Uncertainties in preliminary estimates of diffusion will be reduced with the commencement of a meteorological program to gather on-site data for use in ,

improved diffusion models and to provide empirical studies of diffusion patterns. - ,

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' TABIE_i WIND FREQUENCIES AT POINT REYES. BARN ON 3.626 nRWRVATIONS. 1938 Wet Seasons' November through March DIRECTION PERCENT  !$E PERCENT -

NE 0.7 0-3 MPH 29.1 .

NE 1.0 4-15 MPH 54 4 . ,

ENS 13 16-31 MPH 15.7 E 52 32-47 MPH 0.8 ESE ,

6.4 -

1 SE 7.1

,e) SSE.

7.0 l .c S 2.8 ~

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SSW 30 SW 24' ,

f VSW 13 i

W 1.8 4 4

WNW 52 NW 12 9 NNW 10.7 l

N 23 CAIM 29.1 -

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WIND riusQUziNCIES AT POINT REYES. BASED ON 'L.042 OBSERVATIONS.1938-Al  ;, .

Dry Season: May through September ,

DIRECTION PERCENT. SPEED PERCElG ,

NNE O.2- 0-3 MPH . 25.6 .

NE - 0.1 4-15 MPH 66.4-ENE 0.05 16-31 MPH 8.0 E 0 35 ESE 0.9 SE .. 3.6

! /.\ SSE .5.2

! s./ -

1 S 2.1 SSW 1.4 SW 2.4 WSW 1.9 W 4.0 ,

WNW 12 5 NW. 22.2 NNW .'.15 d N 2_. 5 CAIM 25.6

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TABIE 3 WIND FEQUENCIES AT POINT EYES. BAmn ON 9.181 OBSERVATIONS.1938-L1 Annual l

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DIECTION PERCENT SPEED PERCENT NE 0.8. 0-3 MPH 26.0 NE 09 4-15 MPH 59.0 EE 0.6 16-31 MPH LO E 24 32-47 MPH 1.0 ESE 33 .

Il SE 52 - -

SSE 5.7 .

S 2.2 SSW 2.0 SW 2.1 WSW l.5 W 2.7 WNW 8.5 NW 18.0 NNW E6

.N 35 l . CALM 26.0 l.

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[ .i AppIndix III -

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t FASTEST MIIE OF VIND RECORDE AT POINT RimCS POINT R!mCS LIGHTHOUS1!:

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}ipLfg SPED DIRECTION M (MPH) -

January .79 W 1916 February 77 W 1917 March 82 SW 1902 April 84 W 1915 9

May 91 W 1895 i

'] June . 72- W 1914 July 69 W 1902 '

August 59 W 1908 September 58 W 1903 5 October 69 W 1908 November 63 ' S!t 1902 December 73 ; S 1921 Based on a 31-year record.

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' TABLE 5  !:

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PRECIPITATION FOR FORT ROSS, CALIFORNIA '

MONTHII  ;

i

. RECORD RECORD ..-

AVERAGE

  • HIGHEST ** LOWEST ** l January 7.h3" 33 29" 53" l February 6 38 29.65 .25 ,

March 5.20 26.27~ .03 i.

April 2.80 16.59 00 .

May 1 70 -

8 50- 00

, June 72 h.h0 00 .s l3 July .06 1 31 00

- . August .0h 31 00

  • i' September ~ .2h' 6.07 00 ','!

October 2.19 10.92 00 i November h.35 19.26 00 December- 7 75 23 38 .15 , r ANNUAL 38.86" 88.17 " 20.60n

  • Based on 22-year record
    • Based on 83-year reconi

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TABIE 6 ,

MEAN NUMBER OF DAYS WITH PRECIPITATION AT POINT REIES*

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J F M 'A M. J J A S 0 N D ANNUAL j ',- .) .13 I

12 n 6 5 2 1 0 3 '5 8 11 77 4.

W

  • Based on 32-year recorti r

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- DURATION AND FREQUENCY OF VARIOUJf INTDISITIES OF ,

i PRECIPITATION FOR POINT,REYES*

(INCHES PER HOUR)l') i DURATION EIPECTED RECURRENCE (IEARS) 2.

f 0 J.0, 100

, . 5 minutes 1.h0" 2.05" 2.h588 3.80n 10 "

1.05 1.55 1 90 3.00 -

15 .S8 .1.h0 1.70 2 75 20 "

.79 1.20 1 50 , . . 2.h0 ,-

30 "

.67- .99 1 30 2.00

-60 "

.h8 .71 .88 1.h5 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> r^ , - 6 "

.25

.17 36 ' .hk .68 .

.23 .27 .k2 . .

I x 12 .

-.11 .15 .18 .26. .

2h -" .07 .09 .1h .17 .

  • Based on 20-year reconi EXAMPIE: A rate of rainfall of 1.50 inchen per hour for 20 minutes can be, expected once in 10 years. ' ,

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App;ndix III :

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' TABLE 8 4

TEMPERATURES FOR POINT REYES, CALIFORNIA (DEGREES FAHRENHEIT) ,

i AVERAGE ** AVERAGE n P200RDM RECORD e AVERAGE

  • MAXIMUM MINIMUM HIGH LOW January h9.5 5h.1 'L5.1 78 31 i February 50.2 5h.5 h6.0 78 33 i March 50.h 55.0 h5.7 88 30 ]

April 50 9 55.5 h6.h 83 36 -i May 51 3 55.6 h6.9 85' 38 June

]

'X 52.7 57.1 h8.0- 87 h0  !

July $3.6 58.0 h9.0 91 h2 August 5h.h 58.5 50 3 90 h1 i September 56.3 '61.0 51.5 98 h5 1 October 55.6 60.8 50.5 91 h1 1 November $h.3 59.0 h9 3 83 3h December 50 9 55 5 h6.h 73 3h ANNUAL 52.5 57 0 h7 9 98 30 WET SEASON 51.1 55.6 h6.5 DRI SEASON $3 7 58.0 h9.1 .

  • Based on h2-year reconi e Based on 39-year recorti E____________.____._______________ _ _ _ _ _ _

t- ,i I

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, -i TABLE 9' l

MEAN WET BUIB TEMPERATURES AT FORT BRAGG (*F)*

MONTHLY .

J F M A M J J A S 0 N D h [8 h7 2 h6.9 h8.1 50.h. 53 3 53 2 53 3 53.6 52 3 kB.5-h7.2

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WET SEASON DRY SEASON h7 3 52.8 ANNUAL

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50.1

  • Based -on.a 3i-year record taken at Fort'Bragg I

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t . _ ... . , ._ . . . . . ,. . . . _ - _ . . . . _ . . , . . ._ . . _ _ _ . _ . . . _ . _ . . , .

{. . _ _ _ _ . _ __________________________.____________a

l0.5) 4 dhkM: : ti.iC}saryshk.h;dink: G:hs;.:;.gi.Lgny, n%g;.,.L6h. gja.Ja ws,&p;w;g:u.g gif,g;.,;]

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Appendix III,  ;

l 2

9 e ll 1

1 1

i TABIE 10 . l 1

(

MEAN WET BULB TDFERATURES FOR DIFFERENT TIMES OF DAY AT FORT BRAGO (*F)* i 1

MONTHLY i

1 1

Oh00 PST 1600 PST ,

l l

January h3.h 50.2 February h3.6- 50.8 March h2.8 50 9 April hh.2 51.9 May h6.9 53.8 June h9.h 57.1 July h9.8 56.6 August h9.2 57 3 September h9.6 57.6 October h8.3 56.3 -

November hh.0 53 0 .

December h2.6 51.8 ANNUAL h6.2 53 9 WET SEASON h3.3 51 3 DRY SEASON h9.0 56.5

  • Based on a 3)-year recorti taken at Fort Bragg 6

N t

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j.

6 .

(.

Appendix III y ~s, -  ;-

i i

f '.'. '

TABIE 11 , i SKY CONDITIONS AT JENNER, CATRORNIA*

(IN PERCENT CF TOTAL HOURLI OBSERVATIONS FOR EACH SEASON) {

i j

i HIGH BROKEN .

CLEAR SCATTERED OR OVERCAST LOW BROKEN IDW OVERCAST ,

Wet Season 31 5 17 2 1h.6 . 8.8 27.8 d- Dry Season' h2.0 78 2.8 3.6 h3 8

  • Basedon1)-yearrecord 9%

, i

k

{

Appendix III m r N., ,, +

d TABLE 12 .

i FREQUENCY OF'VARIOUS CEILING HEIGHTS AT JENNER, NATTFORNIA* I (IN PERCENT OF TOTAL OBSERVATIONS FOR EACH SEASON) j b

I HEIGHT WET SEASON DRY SEASON 0-h50 Feet 5 15** 3h.3%**

n, ..

h51-950 h.9 8.1 ,

s.

951-2050 a 13 3 39 ,

~

2051-3050 a 31 .5 3051-5250 " 3.9 5251-9750 a 63 7

> 9751 5 63.h 52 5 100.0% 100.0%

  • Based' on li-year recorti
    • Based on hourly observations L___ _ - _ _ - _ _ _ _ _ _ - _ _ _ _ _ _ __ _ _ ____ ___

s ~p5l

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i i.

Appendix III

.,m ~

N. ' /

5 TABLE 13 PRELIMINARY ESTIMATES OF MlEQUENCI T'16 WIND DIRECTIONS, ANNUAL BASIS: -

FREQUENCY OF STABILITY FOR EACH DIRECTION, AND AVERAGE VELOCITI FOR EACH .

DIRECTION AND STABILITY CLASS ,

I  :

t 4

Wini Frequency Stable Unstable or Neutral in Average Average Direction Percent Frequency i Velocity Frequency Velocity N 3.5% 20% 8 mph 80% 15 mph NNE .8 l h0 7 60 15 NE .9 h0 5 60 ,16 ENE .6 '60

']) h h0 , 16 '

E 2.h 70 '

l h 30 16 .

ESE i 33 55  ; 5 ,

h5 15 l i l SE 52 55 <

5 h5 ,

15 i SSE 57 30 5 70 17 S 2.2 k0 5 60 17 SSR 2.0 35 7 65 17 i

SW 2.1 35 5 I 65 15 WSW 1.5 ho 5 60 15 W 27 30  ! h 70 16

'M 8.5 1 30 6 70 17 I NW , 18.0 30 5 70 17 NE* 1h.6 20 8 80 17,

)* O 26.0 60 -

ho

! ,i o Actually 0-3 MPH

  • f;i'd2,LQL5,8yy:#

.- th=k 'CQ}ykLQUjj&fkWd')l1:{4M2RQMAG&DsQ&Qhe$h.Lh:fQ:2 s:g&;y.a' i ..

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' Appendix III' i.. :)

3 yn.g. -

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.t, TABIE 1h

~

DIFFUSION COEFFICIENTS

.gc PARAMETER UNSTABIE STABIE D .22 5 Cy (meters) .6 .2-Os .2 .02 t

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m__ .___.-.__._m _ ..,_ _ _ . . _ _ .

EShila'd;.2LiddLd3.$d![f,151bifluDMi@M4E'MU#OiUNWMit IAhic bn;sibd6;,

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f.

Appendix III

(,

.1 TABLE 15 i /

4 MEAN TEMPERATURE SOUNDINGS AT OAKLAND AT 1600 PST FOR 50 SUMMER DAYS, 1957-58 Westerly Group, 23 Days Southerly Group, 27 Days HEIGHT (M) . TEMPERATURE ('C) HEIGHT (M) TEMPERATURE ('C)

- i Surface 22.1 Surface 22.0 261, Inversion Base 17.5 235, Inversion Base 17 1 805, Inversion Top 23 9 795, Inversion Top 23 5 2000 20 7 ,... 2000 19.6 3000 11.3 3000 9.5 g.

Sep Edinger, James G., "The Influence of Terrain, etc."

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52k:h WELicai%d2AL GLUTAn14bb1AMAM1Gkh$& h k15OESEE0SiiLn5A' f  ?

Appendix'III f) TAE M PREVALENCE OF STAGNANT OR " LIGHT-Vmmxn CIRCULATION PATTERNS IN THE SAN FRANCISCO BAT AREA, 1952-1955 (in percentage of time)*

Time Period All Month Oh00 a.m. 1000 a.m. Oh00 p.m. 1000 p.m. Periods January 39%(12h) 32% (12h) 30%(12h) 35%(12h) 3h%(h96) <

Fcbruary' hl (113) 29 (113) 20 (113) h3 (113) 33 (h52)

March 31 (12h) 30 (12h) h (12h) 26 (12h) 23 (h96)

April 33 (120) 19 (120) 1 (120) 13 (120) 16 (h80)

My 31 (12h) lb (12h) 2 (12h) 1h (12h) 15 (h96) .

June 17 (120) 7 (120) 0 (120) 6 (120) 7 (h80)

July 12 (12h) 5 (12h) 0 (12h) h (12h) 5 (h96)

/'3 August 9 (12h) 15 (12h) 0 (12h) h (12h) 7 (h96)

S ptember 38 (120) 28 (120) 2 (120) 22 (120 22 (h80)

October 52 (12h) 39 (12h) 5 (12h) 3h (12h) 32 (h96) i November 58 (120) hh (120) 23 (120) 51 (120) hk (h80)  !

Dacember 35 (12h) 27 (12h) 22 (12h) 31 (12h) 29 (h96) l Annual 33%(1h61) 2h% (1h61) 9% (lh61) 2h%(1h61) 22% (5,8hh) )

{

l 0

Basis of each percentage shown in parenthesis. Divide tabulated percentage by 100 to obtain relative frequency and multiply by number in parenthesis 3 i

to obtain observed frequency.

{

l (From a report by C. L. Smalley, U.S.W.B.)

) I l

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l

ab.Sisij'4 PAW,Z;4n;Qi;g'dqvM3,'@;WNQQe PhgdMQ;1%x%WgW.th:$ggiejgs_ _ _ _ _ _ _ _ _ _ _ - _ _ _ - _ _ _ _ - _ _

g. P~

Le L g, 1 a

Appendix III n

TABLE 17 I

i REPORTING POINTS USED IN THE SAN FRANCISCO BAT AREA CIVIL DEFENSE WIND FLOW STUDI ' i

1. Santa Rosa, Southwest Airways Co. 19. Alcatraz Light, U.S.C.G.
2. Travis AFB, U. S. Air Force ]
20. Treasure Island, U.S.N.
3. Sacramento Airport, U.S.W.B. 21. Alameda Naval Air Station
h. . McClellan Field, U.S. Air Force 22. Oakland Airport, U.S.W.B.
5. Mather Field, U. S. Air Force 23. San Francisco (downtown)
6. Napa County Airport, Southwest U. S. Weathe: Bureau Office Airways Co. 2h. Hunter's Point Shipyad
7. Point Reyes Light,U.S.C.G. U.S.N. (firehouse)
8. Mt. Tamalpais, Marin County 25. ' San Francisco Airport Fire . Lookout U.S.' Weather Bureau "9. Hamilton Field,. U. S. Air Force 26. San Carlos, Fire Dept.
10. Mare Island, U.S.N. Shipyard 27. Montara Light Station
11. - Concod,' Diablo Fire Station U.S.C.G.

]-

12. . Richmond, Standard Oil Co. 28. Redwood City, Fire Station

. i

13. Orizzly Peak Fire Lookout: 29 Centerville, Sheriff's Hqtra. .

Berkeley' 30. Moffett Field, U.S.N.

Ih. University of California 31. San Jose Muni Airport, .

15. Fara11one Is1. U.S.C.G. - Southwest Airways

. 16. San Francisco Light Ship, U.S.C.O. 32. Mount Hamilton, Lick Observ-

17. Point Bonita Light, U.S.C.G. atory q
18. Fort Point Station, U.S.C.G. 33 Stockton Airport, Civil Aeronautics Comm. Station '

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Appendix III b

'y .

TABLE 18

- 500 METER RAWINS WHEN PRECIPITATION OCCURRED AT SURFACE Fre'quency of Occurrence Direction by Speed Groups-4 Oakl and, California January,19h8 - December, -1952 Anmin1 I

MPH N- NNE ,NE ENE E ESE -SE SSE S SSW SW WSW W WNW NW NNW L 1;-3 0.h 0.h h-12 0.h 0.8 0.h 1.2 0.h 1.2 15 27 1 5 ~h.2 5.0 5.8. 1.5 1.9 .

1 13-2h '

O.h 0.8 0.h h.2 6.9 5.3 7 3 6.2 6 5- 1 9 0.8 0.h I{~')25-310.h 0.8 3.h h.2 53 23 1.2 0.8 1 5 0.h. '

> 31' . 0.h 3 1 31 1.9 0.h 0.h '

i

, Total 0.8 0.8 0.h 0.2 0.h 0.2 2 712 716.9 S.213.B 12 713.5 5.0 3 5 0.h l

Colm: None Basis: 260 Observations 1 .

\

e (From a Report by Humphreys and Wilkins, U.S,.W.B.)

'?

l l ,. . . .

o____----_---_----. - - - - -.-- - - - - . - - - -- -

.p ,h'-l y,,:  !

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1 1

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t. 'i 9;,  !

i APPENDIX ly 4, ..

REPORT ON EARTHQUAKE HAZARDS AT THE i BODEGA BAY POWER PLANT SITE 1

7 C

5 4

t n

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