use of remote sensing for routine coastal water monitoring by a state agency bob connell new jersey...
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Use of Remote Sensing for Routine Coastal Water
Monitoring by a State Agency
Bob Connell
New Jersey Department of Environmental Protection
Bureau of Marine Water Monitoring
Mission for Monitoring
• Characterize the variability of some parameter– Temporal variability (over time)– Spatial variability– At various scales of both time and space
Traditional boat sampling can miss important spatial
variability
Algal Bloom BarnegatInlet
Fixed StationMonitoring
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J F M A M J J A S O N D
Sampling Bloom
And more complete temporal coverage
Biweekly boatsampling
Bloom
How can we improve ourmonitoring ofcoastal waters?
Coastal Monitoring Strategy
• Co-funding by Federal and State programs
• Nested designs to allow State-specific issues to be addressed in a national context
KeyKey Attributes:Attributes:
Coastal Monitoring Strategy:
• Enhance the density of coastal buoy and shore-based meteorological and water-level observing system network by adding temperature, salinity, nutrients, hazardous algal blooms and other chemical and biological sensors.
Coastal Monitoring Strategy:
• Enhance remote sensing efforts to provide high resolution laser and acoustic substrate/habitat maps, operational ocean color, turbidity, and sea surface temperature (SST) products, as well as coastal land and habitat coverage change.
Benefit of Remote Sensing
Algal Bloom BarnegatInlet
More complete spatial coverage
State Responsibilities That Can Benefit from Remote Sensing
• Water Quality Inventory Reporting• National Shellfish Sanitation Program• Bathing Beach monitoring• Pollution Source Tracking• Spill Response (Oil Spill Surveillance System)• Fisheries Management (Maine Lobster Project)• Benthic Habitat Monitoring (SAV mapping)
Water Quality Inventory
Each State is responsible for reporting this information to theU.S. EnvironmentalProtection Agency.
National Shellfish Sanitation Program
• Requires shellfish-producing States to monitor their coastal waters for substances that could render shellfish unfit for human consumption
• The list of substances includes biotoxins from harmful algal blooms.
• First line of defense is a good monitoring program for the presence of algal blooms.
Paralytic Shellfish Poisoning (PSP)
• Occurs in all coastal New England states and along much of the west coast from Alaska to California.
• Causative species - the dinoflagellates Alexandrium tamarense, A. fundyense, and A. catenella
Amnesic Shellfish Poisoning (ASP)
• Occurred first in southeastern Canada, but has recently been a problem for the U.S. Pacific coast states
• Causative species - the diatoms Pseudonitzschia pungens forma multiseries and Pseudonitzschia australis;
Source: Woods Hole Oceanographic Institute www.redtide.whoi.edu/hab/HABdistribution/habexpand.html
Expansion of HarmfulAlgal Bloom problems in the US
Progression of Chlorophyll a LevelsAugust 2001
Limitations of SatelliteRemote Sensing
Resolution - smallembayments are crucialto local economies, butare not well monitored at1 km resolution.
Vulnerability to turbidityand bottom reflection in shallow bays.
Aircraft Remote Sensingprovides a viable alternativeto satellite remote sensing.
Application of AVHRR data to oyster resource issue in New Jersey
• Unusually high levels of a naturally occurring bacterium in New Jersey oysters for 1-2 weeks in June 2001.
• Since this had never occurred before, we needed to identify unique conditions that might have caused it.
• The bacteria involved (Vibrio parahaemolyticus) are primarily responsive to temperature conditions.
Model of Bacterial Response to Temperature
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10 15 20 25 30 35
Water Temperature (°C)
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Problems with assessing temperature
• Affected oyster beds were not near any continuous monitoring location for temperature.
• Boat sampling occurs, but only 1-2 times/month and not at the same location as the beds. Temperatures could change dramatically over 2-4 weeks.
Using AVHRR SST data,we were able to determine the temperature over the oyster beds during the datesthat the suspect oysters were harvested.
Comparison of AVHRR data to long-term temperature averages
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5/29/01 6/8/01 6/18/01 6/28/01 7/8/01 7/18/01 7/28/01 8/7/01
Wa
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Average Water Temperature1980 - 1998
Water Temperature2001
What is needed for greater use of Remote Sensing data by theStates in their coastal water quality monitoring programs?
Parameters
• Chlorophyll
• Temperature
• Turbidity
• Thermal imaging
RS Needs of State Monitoring Programs
• Rapid, reliable access to processed data– Processed
• In general, State agencies do not have staff with extensive RS experience to process data
• Geo-referenced data (e.g. GeoTIFF) is a plus
– Rapid• Often responding to rapidly changing conditions. Data that is 1-
2 weeks old may not be useful.
– Reliable• Consistent data availability and consistent procedures to access
the data
RS Needs of State Monitoring Programs
• Nationally recognized processing methods• Resolution on a scale to assess water quality
conditions in small bays and estuaries– Access to data from new satellite sensors– Sensors to mount on agency owned aircraft
• Reasonable cost with incremental buy-in– States are reeling from budget deficits & balanced
budget requirements– Need to demonstrate value to management
Summary
• Remote sensing will be increasing used by State agencies to perform their coastal monitoring responsibilities
• Partnerships among government agencies, industry and academic institutions will bring this about.