Engineering Surveys & KGPS

Outline

• Problem Example• Applications / uses of KGPS• Project Example

Red > 100M tons Green 20M – 100M tons Blue < 20M tons

Inland Waterways

~ 15,000 miles

Navigation Channel DredgingEngineering & Construction Applications

Dredge“Stuyvesant”

Dredge Payment Surveys

Sections must extendoutside channel toeto fully develop side slope(150 to 200 ft typical)

Cross-sectionsspaced 100 ftor 200 ft C/C

40x300 ft channel

DREDGE PAYMENT SURVEYS

Dredge Measurement & Payment Survey

TIN

3-D Model

Volume computations

Dredged Material Placement Area

Offshore SubmergentDisposal Area Surveys

Emergent or UplandDisposal AreaConstruction Surveys Tampa Bay

Beach Profile Surveys Construction Measurement & Payment

ControlBaseline Beach profile

lines spaced200-500 ft c/c (typical)

Ft Pierce, Florida Jacksonville District

Typical disparity between topo and acoustic surveys

Rod & Transit and RTK Techniques

vertical accuracy: +/-1 cm to +/- 10 cmhorizontal accuracy: 0.1 to 3 meters RMSspatial resolution: typically shore-normal lines 300 m (1000 ft) apart positioning system: ranging/ETS relative to established benchmarksminimum crew: 2cost: about $1000/Km ($1600/mile) of

beach assuming 300-m profile spacing

TopoProfile Hydro

Profile

Beach RenourishmentTypical Section for Construction Measurement & Payment

Jetty & Breakwater Surveys & Cross-Sections

Topo/hydro sectionsrun 25 to 50 ft C/C

Jetty control baselineHubs set 25 to 50 ft C/C

0 m 3 m 6 m 9 m 12 m 15 m depth in meters

pipeline

Joint Airborne Lidar Bathymetry Technical Center of Expertise

Niagara River

Electronic Chart Data Electronic Chart Data benefiting safety of benefiting safety of navigationnavigation InlandInland CoastalCoastal

Inland Electronic Navigational Chart

Hydrographic Surveys of Shallow Wetland Areas

KGPS Uses in R&D

Obtain basic hydrography for design guidance of depth & width of coastal navigation channels

Use of numerically derived risk-based probabilistic channel sizing … reduce over-conservative channel design

Project Example

Regional Sediment Management