Client: AtkinsRéalis
Project Type: Hydrographic Survey
Project Location: Pinellas County, Florida
Services Provided: Single Beam Bathymetry, Rock Probes
As a subcontractor to AtkinsRéalis (Atkins), Morgan & Eklund, Inc. (M&E) performed a bathymetric reconnaissance survey for the City of St. Petersburg Canals 11 and 12 (~1.9 Linear Miles).
Scope of work for these sites included performing a single beam single frequency bathymetric survey on 100’ cross-sections along the centerline profile, and three passes down the centerline of the channel. M&E survey crews also located docks and seawalls and delineated the edge of mangrove along the project area. Rock probes were also collected down the centerline every 100’ to identify the depth of rock substrate.
Atkins-approved Safety and Float Plans were followed during all phases of the field work.
Calibration and control procedures included establishing site control from local NGS monumentation. Tide staff was established using differential leveling techniques. RTK rover equipment accuracy was verified via control check measurements performed at the start and conclusion of each survey session.
Field survey data was collected utilizing a 16’ aluminum skiff equipped with a Trimble SPS852 GNSS RTK system integrated with a Teledyne Odom E20 multi-frequency single beam echosounder operating at 200kHz. Water column speed of sound calibration was obtained with an AML-3 sound velocity probe. Vertical accuracy of water surface elevations provided by the Trimble SPS852 system was confirmed by tide staff readings taken at 15-minute intervals for the entirety of the survey session. Additionally, the M&E survey crew documented seawall and dock improvements, as well as delineation of mangrove habitat extents utilizing an RTK rover system while transiting through the site from the survey vessel. Rock probes were performed utilizing RTK rover equipment and a 20’ probe rod, with probes taken from the survey vessel platform.
Deliverables included contour map and cross-sections in *.pdf format (signed and sealed), along with digital *.dwg and *.XYZ files. Cross-section deliverables described the bottom profile and depth of rock.
