What is the goal of the project?
The main goal of the project is to provide real-time information about water levels across Chatham County to aid in emergency planning and response during episodes of flooding associated with storms, king tides, and other environmental events. The sea level data also provide a unique and important dataset to aid scientists, engineers, and regional planners in quantifying the short- and long-term risks associated with continued sea level rise.
Who is involved in the project?
The project team includes Georgia Tech researchers, officials from Chatham County Emergency Management (CEMA), and officials from the City of Savannah. Drs. Kim Cobb and Russ Clark head up the Georgia Tech team, Randall Mathews represents CEMA, and Nick Deffley (Director, Office of Sustainability) represents the City of Savannah.
What is the current status of the project?
As of August 9, 2018, the team has installed 3 sea levels sensors that communicate with 3 base stations at locations on Tybee Island, Whitemarsh Island, and Wilmington Island.
How do the sensors measure sea level?
The sensors use the roundtrip travel time of ultrasonic waves to measure the distance from the sensor to the water level. They log measurements every ten minutes, enabling their batteries to last one year or longer.
What interesting signals have the sensors captured thus far?
The sensors captured the king tide event on August 10, 2018, with the different sensor registering high tides that differed by as much as 1 foot in height and by as much as 40 minutes in the timing of peak tidal height.
While Hurricane Florence did not make a direct hit on the coast of Georgia, we did register some departures from normal tidal heights and timing, owing to the sustained winds along the coast over those days. On the front side of Florence, sensors registered 3-4” higher tidal heights, and on the back end they registered a full foot lower than predicted. As with the king tide, the specific timing of the high and low tides during those times were 30-40 minutes different than predicted.
Where are future sensor deployments planned, and how are they decided?
Near-term priorities for sensor placement include a range of different coastal environments in Chatham County, along the canals that run through the City of Savannah, and further inland, sensors to measure the level of rainwaters that accumulate in flood-prone areas. The specific location of sensors will be determined by the project team, as they identify city, county, and in some cases privately owned installation sites that provide the proper mounting environment. For the sea level sensors, deployment on bridges is optimal, as those represent critical infrastructure that emergency responders must monitor in real-time, to aid coastal evacuation efforts as well as safe recovery efforts.
What else could sensors measure?
We are excited to pilot temperature sensors throughout Chatham County, to aid the community in monitoring urban heat islands, as well as ocean temperatures. But the sensor technology could be used to measure dozens of different environmental indicators of relevance to community health and safety.
How is the project funded?
The project is one of four Georgia Smart Communities grants that provided funding for Georgia Tech researchers to partner with communities across Georgia to advance community well-being through the application of smart technology. Funding for the Georgia Smart Communities initiative comes from a consortium of public and private funders, listed here.
How long will this project last?
The first phase of this project will last until August, 2019. However, the project is pursuing a variety of additional funding avenues to enable the project’s near-term growth and continued development. This includes a range of federal, state, and local sources of funding.
How can I get involved?
We are interested in hearing from the following community members:
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