Svašek Hydraulics general policy is to train our project engineers to carry out measurements themselves for the following reasons:
The result is that our hydraulic engineers gain more hydraulic experience and knowledge which they apply in their desk studies.
Svašek Hydraulics is exerienced in the following type of surveys (more detailed information available below world map):
In the past measurements of bathymetry, topography, tides, waves, weather and currents have been executed all over the world. The locations of these projects are shown in the map below. Some of the red dots have a link to a project sheet. A list of the project sheets available can also be found at the end of this page.
Bathymetric surveys
Bathymetric surveys have been carried out regularly the past years and ranges from extensive team surveys to surveys of a
small project areas carried out with open dinghy's.Past key experience:
- Bathymetric survey of 100 km long shore coastline of the Guyana
- Valeport Midas surveyor echosounder, 33 & 210 KHz with internal GPS - Bathymetric survey of 350 km of the River Niger from Lokoja to Aboh
- Navisound 420 (dual frequency) and Navisound 210
- Ashtech-z extreme RTK for benchmarking - Bathymetric survey of river entrance of Bonny River, Nigeria
- Valeport Midas surveyor echosounder (Dual Frequency with internal GPS)
Tidal measurements
Tidal measurement forms the basis of providing boundary conditions of our hydraulic modelling studies. Svašek Hydraulics
owns several tide gauges (Diver, Van Essen) which are applied all over the world. Some of them include temperature and
conductivity sensors to measure the salinity of the seawater.
Fixed and vessel mounted current measurements
Current measurements are carried out for mainly the calibration of our numerical modelling or else are used as boundary
conditions. Svašek Hydraulics owns a regularly used Valeport Model 108 MkIII direct reading current meter. Also past
current measurement campaigns were carried out using the following equipment:
- AWAC upward looking ADCP (Nortek-AS), installed on the sea bed in India and Guyana.
- Vessel Mounted Doppler profiler (VMDP), used again in India and Guyana to measure current profiles along transects and discharges through rivers.
- Current measurements with a Workhorse Mariner (Teledyne, RDI Instruments) Vessel mounted current profiler in The Netherlands, Berghaven.
- Aquadopp (Nortek AS) fixed point current measurements, applied for profile measurements as well as single point measurements.
- Marco Flow current meter connected to an EMM data telemetry buoy (Ghana).
Wave measurements
Wave height, wave periods and directions are frequently used for design studies of breakwaters, dikes and harbour
layouts. Measured waves are needed to deliver boundary conditions for numerical modelling with for example
SWAN or HARES.
Svašek Hydraulics has measured waves in the recent years on the following locations:
- Installation of a Endeco Wave Track buoy in Ghana which online data communication to a shore based computer through an EMM data telemetry buoy.
- Fixed point wave measurements in Guyana with an AWAC-AST (Nortek AS) ADCP fixed to a bottom mounted frame at 24 m depth. The AWAC was deployed twice for a two month period.
- Fixed point wave measurements in India with an AWAC-AST (Nortek AS) ADCP fixed to a bottom mounted frame at 15 m depth. The AWAC was deployed once for a one month period.
Suspended sediment monitoring
Measuring suspended sediment loads are for example useful to quantify dredging loads for future harbour developments or
to optimise existing harbour layout expansions. Svašek Hydraulics successfully applies its Silt and Sand modules in
FINEL for future harbour developments all over the world. To measure suspended loads the following instruments were used
recently:
- Optical Backscatter (OBS) measurements using the OBS-3A sensor of D&A Instrument Company. The sensor has been applied stand-alone to measure suspended sediment profiles on a fixed location once every hour and is applied connected to the bottom mounted AWAC to measure simultaneously acoustic backscatter profiles with curtrents and waves
AIS ship tracking system
AIS (Automatic Identification System) is a worldwide used transponder system for shipping traffic. Svašek Hydraulics
uses this system to monitor ship movements.An example of shipping traffic monitoring inside the Port of Rotterdam of Wednesday December 12th 2007 can be found here. The cruise ship Queen Victoria, departs backwards from the Rotterdam Cruise Terminal. The cruise ship turns in one of the harbour basins and then sails for open sea. The whole manoeuvre is assisted by tugs.
Available project sheets
- India: hydrographic surveys (water level, currents, waves, sediments)
- Guyana: hydrographic surveys (bathymetry, currents, waves, tide)
- Nigeria: hydrographic surveys (topography, bathymetry, currents, waves, sediments)
- Nigeria: survey River Niger (bathymetry)
- Nigeria: Forcados South Point Erosion Study (marine survey)
- Ghana: installation of data monitoring buoys and a tide gauge
- Costa Rica: field investigations Moín harbour
- Malta: current and water level measurements
- The Netherlands: Nautical field study near CERES container terminal, Port of Amsterdam
- The Netherlands: Measurement of ship induced flow in the Van Harinxma channel, the Netherlands
- The Netherlands: Measurement of ship induced flow in the waterway to Drachten
- The Netherlands: impact of passing ship on moored vessel
- The Netherlands: survey bank revetments
- Inonesia: marine surveys for fishing ports in Biak, Tual, Kupang