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Kilo Nalu Nearshore Reef Observatory Acoustic Monitoring The Soundscape of a Nearshore Reef near an Urban Center Whitlow W. L. Au Marine Mammal Research.

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Presentation on theme: "Kilo Nalu Nearshore Reef Observatory Acoustic Monitoring The Soundscape of a Nearshore Reef near an Urban Center Whitlow W. L. Au Marine Mammal Research."— Presentation transcript:

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2 Kilo Nalu Nearshore Reef Observatory Acoustic Monitoring The Soundscape of a Nearshore Reef near an Urban Center Whitlow W. L. Au Marine Mammal Research Program Hawaii Institute of Marine Biology University of Hawaii

3 KILO NALU & MAKAPUU SITES Makapuu EAR

4 22 m depth 690 m off-shore Sample rate = 24,000 Hz = 4.2 Gbytes/day = 124 Gbytes/mn Modified EAR

5 Background 1.Ecological Acoustic Monitor (EAR) modified and deployed at Kilo Nalu site – up and running 1 st week in Nov, 2008 2.Sounds being heard Boats, boats, boats and more boats. humpback whales dolphin echolocation clicks snapping shrimp rain

6 3 K 2 K 1K 0 1234 Time (min) 55 Frequency (Hz) 4 K 5K 6 K EXAMPLE OF A BOAT PASSING BY THE KILO NALU SITE Sound starts

7 EXAMPLE OF HUMPBACK WHALE SONG AT THE KILO NALU SITE 3 K 2 K 1K 0 0 12345 Time (min) Frequency (Hz)

8 EXAMPLE OF FISH SOUNDS AT THE KILO NALU SITE 3 K 2 K 1K 0 0 12345 Time (sec) Frequency (Hz) 0100 ms Frog fish

9 6 November 100 105 110 115 120 125 130 0 123 4 56 789 10 121314 15 16 17 181920212223 Hour (HST) RMS (db re 1uPa) Boat Snapping shrimp EXAMPLE OF RMS SPL IN A DAY: 6 NOVEMBER

10 1-7 November 100 105 110 115 120 125 130 135 RMS (dB re 1uPa) 123 4567 DAY EXAMPLE OF A WEEK RMS SPL: 1-7 NOVEMBER Boat in daylight/ snapping shrimp night

11 SPL 28 February (Mean SPL = 110.4 dB re1uPa) 105 110 115 120 125 130 RMS (dB re1uPa) 0 123 4 56 789 10 121314 15 16 17 181920212223 Hour (HST) 28 February Boats & Humpback Whales Hump & shrimp EXAMPLE OF MIXTURE OF SOUNDS IN WINTER

12 POSSIBLE PRODUCTS 1.Obtaining acoustic signature of small boat Navy has many signatures of ships – not small boats Home land security or coastal security issues 2.Long term – time series of snapping shrimp sounds biological indicator of negative effects on environment i.e. EARs data from Kure and Pearl and Hermes show lower levels for up to a day after a storm. 3.Behavioral pattern of Humpback whales off Oahu data for management of HIHWNMS arrival and departure off Oahu effects of anthropogenic noise

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