Alamitos Generating Station

Appendix A Physical Oceanographic Data A1. Source Water Currents A2. Source Water Temperatures from ADCP Instruments

Alamitos Generating Station IM&E Characterization Study Appendix A1: Source Water Currents

A1-1

Appendix A1 Source Water Currents

Physical oceanographic data were collected from the source water body to describe current regimes that can affect larval transport in the vicinity of the AGS. Two Nortek Aquadopp® acoustic Doppler current profilers (ADCPs) were positioned in separate locations in San Pedro Bay, one (CM1) approximately 2.1 km (1.3 mi) from shore off the entrance to Alamitos Bay at a depth of −12.4 m (−40.7 ft) MLLW, and a second unit (CM2) approximately 3.2 km (2.0 mi) from shore off the San Gabriel River mouth at a depth of -16.2 m (−53.1 ft) MLLW (Figure 3.3-2). Both stations were commissioned on January 10, 2006. Station CM2 was decommissioned on January 8, 2007 and Station CM1 was decommissioned on January 11, 2007. Data were downloaded on May 2, 2006 and August 31, 2006. From May 2−5, 2006 Station CM1 did not collect current data due to operational error after the data download. The unit at CM1 had an operating frequency of 1 MHz, while the unit at CM2 had an operating frequency of 600 kHz (Table A1-1). Both units collected data at hourly intervals in a usable range that extended from 0.5 m (1.6 ft) from the ADCP to somewhat less than 90% of the distance to the surface. The half-power full beam-width was 2.4 degrees for both units. Water temperature and water depth (pressure) were also measured concurrently by the units. Water temperatures were calibrated over an approximately four-month period from September 2006 to January 2007 using two calibrated Starr-Oddi thermistors. Pressure measurements were adjusted using barometric pressure data measured at the Los Angeles International Airport and corrected for sea level.

Table A1-1. ADCP deployment parameters for current meters in the vicinity of AGS (Stations CM 1 and CM 2).

Unit Oper. Freq.

Deploy depth (m)

Cells (#)

Cell size (m)

Max. range (m)

Cell precision

(cm/s) Ping rate

Averaging Interval

(s) Repetition rate (hr)

CM 1 1 MHz 12.4 15 1.0 15 0.8 87% 180 1.0 CM 2 600 kHz 16.2 20 1.0 20 1.4 100% 300 1.0

Alamitos Generating Station IM&E Characterization Study Appendix A1: Source Water Currents

A1-2

Figure A1-1. Hourly estimates of water column speed and direction at location CM1, January – April, 2006. Frequency is number of hourly observations.

Alamitos Generating Station IM&E Characterization Study Appendix A1: Source Water Currents

A1-3

Figure A1-2. Hourly estimates of water column speed and direction at location CM1, May – August 2006.Frequency is number of hourly observations.

Alamitos Generating Station IM&E Characterization Study Appendix A1: Source Water Currents

A1-4

Figure A1-3. Hourly estimates of water column speed and direction at location CM1, September – December 2006. Frequency is number of hourly observations.

Alamitos Generating Station IM&E Characterization Study Appendix A1: Source Water Currents

A1-5

Figure A1-4. Hourly estimates of water column speed and direction at location CM1, January 2007. Frequency is

number of hourly observations.

Alamitos Generating Station IM&E Characterization Study Appendix A1: Source Water Currents

A1-6

Figure A1-5. Hourly estimates of water column speed and direction at location CM2, January – April, 2006. Frequency is number of hourly observations.

Alamitos Generating Station IM&E Characterization Study Appendix A1: Source Water Currents

A1-7

Figure A1-6. Hourly estimates of water column speed and direction at location CM2, May – August 2006. Frequency is number of hourly observations.

Alamitos Generating Station IM&E Characterization Study Appendix A1: Source Water Currents

A1-8

Figure A1-7. Hourly estimates of water column speed and direction at location CM2, September – December 2006. Frequency is number of hourly observations.

Alamitos Generating Station IM&E Characterization Study Appendix A1: Source Water Currents

A1-9

Figure A1.8. Hourly estimates of water column speed and direction at location CM2, January 2007. Frequency is

number of hourly observations.

Appendix A2 Source Water Temperatures from ADCP Instruments

Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-1

Figure A2-1. Annual temperature January 2006 through January 2007 at CM1.

Table A2-1. Monthly and yearly mean temperatures recorded from January 2006 through January 2007 at CM1.

Month Mean Standard Dev Max Min January 13.50 0.86 15.00 12.54 February 13.64 0.67 15.38 12.34 March 11.95 1.09 13.91 10.71 April 11.76 0.86 14.29 10.68 May 14.72 1.20 18.54 12.93 June 14.49 1.83 18.52 11.61 July 15.51 1.74 19.38 12.00 August 15.20 0.77 16.94 13.18 September 16.58 1.23 19.80 14.19 October 16.08 1.09 17.86 13.88 November 16.85 0.57 17.77 15.36 December 15.40 0.51 16.41 13.94 January 07 14.49 0.18 15.07 14.00 Total Year 14.67 1.93 19.80 10.68

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Tem

p C

Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-2

Figure A2-1. Near-bottom temperature and tidal depth from January (top) through February (bottom) 2006 at CM1.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-3

Figure A2-2. Near-bottom temperature and tidal depth from March (top) through April (bottom) 2006 at CM1.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-4

Figure A2-3. Near-bottom temperature and tidal depth from May (top) through June (bottom) 2006at CM1.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-5

Figure A2-4. Near-bottom temperature and tidal depth from July (top) through August (bottom) 2006 at CM1.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-6

Figure A2-5. Near-bottom temperature and tidal depth from September (top) through October (bottom) 2006 at CM1.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-7

Figure A2-6. Near-bottom temperature and tidal depth from November (top) through December (bottom) 2006 at CM1.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-8

Figure A2-7. Near-bottom temperature and tidal depth during January 2007 at CM1.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-9

Figure A2-8. Annual temperature January 2006 through January 2007 at CM2.

Table A2-2. Monthly and yearly mean temperatures recorded from January 2006 through January 2007 at CM2.

Month Mean Standard Dev Max Min January 13.36 0.90 14.97 12.31 February 13.54 0.68 14.75 12.14 March 11.79 1.07 13.95 10.49 April 11.62 0.97 14.29 10.44 May 14.13 1.10 18.12 12.45 June 13.54 1.38 17.57 11.54 July 14.97 1.48 18.51 11.86 August 14.61 0.76 16.53 12.72 September 16.22 1.31 19.48 14.02 October 15.84 1.16 17.53 13.52 November 16.67 0.61 17.80 15.31 December 15.38 0.54 16.38 13.29 January 07 14.60 0.22 15.08 13.79 Total Year 14.34 1.86 19.48 10.44

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Jan-06 Feb-06 M ar-06 Apr-06 M ay-06 Jun-06 Jul-06 Aug-06 Sep-06 O ct-06 Nov-06 Dec-06 Jan-07

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p C

Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-10

Figure A2-9. Near-bottom temperature and tidal depth from January (top) through February

(bottom) 2006 at CM2.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-11

Figure A2-10. Near-bottom temperature and tidal depth from March (top) through April (bottom)

2006 at CM2.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-12

Figure A2-11. Near-bottom temperature and tidal depth from May (top) through June (bottom)

2006 at CM2.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-13

Figure A2-12. Near-bottom temperature and tidal depth from July (top) through August (bottom)

2006 at CM2.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-14

Figure A2-13. Near-bottom temperature and tidal depth from September (top) through October

(bottom) 2006 at CM2.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-15

Figure A2-14. Near-bottom temperature and tidal depth from November (top) through December (bottom) 2006 at CM2.

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Alamitos Generating Station IM&E Characterization Study Appendix A2: Source Water Temperatures

A2-16

Figure A2-15. Near-bottom temperature and tidal depth during January 2007 at CM2.

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