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Hydrographical Surveys


SONARSEA, acquires data with high precision using high-tech multibeam echosounder and single beam echosounder in hydrographical surveys carried out within the scope of marine surveys. The gained data sets of xyz (latitude, longitude, depth) are processed through appropriate data process stages and bathymetric maps are obtained and reported. Hydrographic studies are also named as “bathymetrics studies”. Hydrographic surveys;

  • Determination seabed morphology,
  • As period for navigational safety,
  • Determination quantity of dredging material and calculated cubing in before and after seabed dredging operations,
  • Pre/post engineering, 
  • Mapping seabed habitat,
  • Determination wrecks,
  • Port and harbor developments project,
  • Before modelling studies.

Bathymetric maps are produced according to IHO-S44 standards.

Marine Geophysical Surveys


SONARSEA, performs side scan sonar, seismic (subbottom profiler, multi channel seismic – 2D, seismic refraction, U-MASW) and magnetic measurements on geophysical surveys carried out within the scope of marine surveys. The methods carried out on the survey area are determined taking into consideration the project requirements. SONARSEA, offers solutions for the following engineering studies below in the context of geophysical surveys. 

Side Scan Sonar survey;

  • Determination wreck, anchor and similar objects,
  • Mapping seabed habitat,
  • Determination routes natural gas – petroleum pipeline, power cable and fiber optical cable,
  • Determination possible dangers on pre-constructions,
  • Determination and mapping underwater archaeological remains,

Seismic Survey,

  • Interpreting lithological structures bottom the seabed,
  • Identifying material content on pre-dredging,
  • Determining dangerously exposed structure such as landslide, fault, gas accumulations and gas escapes, 
  • Mapping of sediment thickness,
  • Determination carstic cavities. 

Magnetic Survey,

  • Determining metallic objects and structures, 
  • Within the scope of underwater archaeology survey,
  • Identifying and mapping such as fault and dyke structure which can give magnetic anomaly alongside, such as magmatic rocks geological structures having magnetic properties,
  • Determining unexploded ordnance (UXO) and mines.

Oceanographical Surveys


SONARSEA, performs current measurement, sea water conductivity, salinity, pressure, turbidity, dissolved oxygen etc. measurements on oceanographical surveys carried out within the scope of marine researches. Oceanographic surveys;

  • Determining current direction and velocity realizing short-term or long-term current measurements,
  • Determining sea water physical and chemical parameters,
  • Realizing tides and wave height measurements.

With the gained results from the studies, the informations are obtained to gather round modelling studies of planning stage constructions such as harbour, breakwater.

Marine Geological and Geotechnical Survey


SONARSEA, conducts operation in various engineering studies to be determined geological and geotechnical parameters in the project area. Depending on project needs, using marine drilling, gravity core, vibro core and grab sampler equipments are acquired informations related to ground. Collected sediment samples right along with observation results are tested on laboratory to be realized geotechnical calculations. Acquired parameters correlating inferences of geophysical surveys results can be obtained about ground structure transparently. Geological and Geotechnical surveys are performed the following stated applications;


  • Natural gas and petroleum pipeline route, 
  • Petroleum platform site survey,
  • Dredging operations,
  • Port and harbour developments,
  • Burial Assessment Surveys for cable route studies,
  • Marine windfarm surveys,
  • Sediment sampling for ground-truthing, geochemical studies.

Cable and Pipeline Route Survey


SONARSEA, carries out engineering studies that it is necessary in all of monitoring studies such as fiber optical cable, power cable, natural and petroleum pipeline, planning discharge pipeline routes, laying and post-laying studies. With conducted marine surveys for planning stage lines, potential dangers such as wrecks, rock outcrops, abrupt slopes and unstable areas, increasing components of the cost and schedule are identified and offered suggestions. After completing laying operations, once again performing marine surveys, after laying cable/pipe final situation is observed. Existing state of cable/pipe is mapped by sectioning at regular intervals and is reported. 

Underwater Archaeological Survey


Our country, hosting the trade routes of ancient civilizations and significantly enlightening the cultural shift correspondingly, is centered an important place due to its geographical and geopolitical location. When it is considered our country is the single piece of land, where the traces of all cultures related back to the Black Sea, Marmara, Aegean and Mediterranean region can be found, it is clear that our region represents important clues to the history of humanity. In recent years in big-scale projects performed in Turkey conducted by national and international cooperation, in the light of historical records research operations intended underwater archaeology have increased the importance of this issue significantly.

The aims of underwater archaeology are to evaluate archaeological data and interpretation into the broder study of human past, emphasizing not only materials from submerged sites, but also from maritime activities.

SONARSEA, offers optimum solutions in scientifical aimed studies or before construction operations to determine archaeological remains with high technology equipments and experienced team taking account of time and cost factors.

The following surveys are carried out within the scope of the archaeological site investigation; 

  • Side Scan Sonar,
  • Magnetometer,
  • Subbottom Profiler or chirp,
  • Multibeam echosounder,
  • ROV, 
  • Diving operations.

Marine Environmental Monitoring and Ecological Survey


Marine Environmental Monitoring and Ecological Surveys, hold an important place during either scientifical researches or construction operations. 

SONARSEA, conducts within the scope of surveys, sediment and water sampler analysis, trawl and fishing dredge surveys, ROV and diver operations. Observation studies during the fieldworks and then with completing laboratory analysis;

  • Heavy metal analysis,
  • Benthic communities diversity (infauna-epifauna),
  • Algae and seagrass - Vegetation,
  • Taxonomic classification,
  • Sediment and Water Quality,
  • Plankton analysis,

studies is carried out.

Coastal Processes Survey


Coastal processes are those processes that affect the morphology of beaches and shallow nearshore waters. Like these processes are usually the result of interactions between marine and fluvial processes and meteorological conditions. Such interactions of land-marine-meteorological conditions can be changed by human activities and can cause significant changes in coastal morphology. Probably the most important natural force shaping coastlines is the force of waves. Waves affect beaches in two ways. Firstly, relatively steep wind waves cause beach erosion by taking sand and other materials from the area just above the water level and transporting them into deeper water. Secondly, waves approaching the beach at an angle break near the beach and generate a current that moves parallel to the shore line. This is known littoral current is most noticeable in the coastal processes. It causes moving of large amounts of beach sand.

SONARSEA, carries out the following applications within the scope of monitoring coastal processes;

  • Determination natural and anthropogenic reasons of coastal erosion, 
  • Monitoring of coastal erosion with determination of characteristics of coastal sediments,
  • Determination sediment accumulation quantity sensitively with beach profiling measurements,
  • Littoral environment investigation.

Dredging Operation Surveys


Due to seashores of our country are open to erosional effect and surplus materials are transported to marine depositional area, seabed morphology changes on these areas and thus bathymetry survey is carried out on marine areas where the usage is much such as fishing ports, harbors at regular intervals. Due to sediment transportation, by reason of rising of seabed elevation is important for shopkeeping on harbor and dock structures, seabed elevation is lowered by dredging seabed on pre-planned areas. 

SONARSEA, minimizes cost and schedule factors carrying out studies related to identification of possible dangers, assessment of dredging materials and selection of dredging method. Also survey operations applied during dredging and after is supplied to continue operations in consideration of required controls and planned criterias during dredging and after.

Lake and Dam Survey


SONARSEA, conducts survey operations expediently in lakes and dams. The following measurements carried out in this scope;

  • Current measurements and analysis,
  • Determination water level changes on short and long term,
  • Detection of lake or dam base elevation,
  • Realization bathymetric survey for detection of dam life, 
  • Thickness map for accumulated sediment at the bottom,
  • Determining and monitoring of habitat diversity.



SONARSEA, carries out installation of meteorological observation station that it can measure parameters sensitively  such as pressure, moisture, temperature, wind direction and velocity based on project needs in short-term and long-term wave, tide measurement, current, monitoring coastal process and modelling studies.  For the requested time period collected data from meteorological observation stations, can be used numerical modelling studies evaluating together with collected data from oceanographical surveys carried out within the scope of marine research, by this means it is possible to estimate forward looking properly. Also MetOcean monitoring stations can be installed to follow meteorological and oceanographical data concurrently.

Hydrographic and Oceanographic Survey

SONARSEA, carries out and reports Hydrographic and Oceanographic operations explained standards for the given construction and requested on coastal and marine construction such as harbour, jetty, fishing port, firm wooden jetty, dock filling, marinas, floating platform, pipe and discharge pipeline by Office of Navigation, Hydrography and Oceanography. Depend on project the following surveys are conducted;

  • Bathymetric survey,
  • Side Scan Sonar survey,
  • Current survey,
  • Shallow marine seismic survey,
  • CTD survey,
  • Seabed sediment sampling and analyzing.

Marine Renewable Enery Survey


Increasing energy requirement of increasing population expeditiously and developing industry, changing of equilibrium directly away among energy generation and energy consumption in time have caused the idea of orientation to renewable energy sources. Also helping to protect the environment by reducing the emissions of carbon dioxide and in that minimizing external dependency renewables energy has been indispensable for present-day.

SONARSEA, can perform within the scope of marine renewable energy studies intended national and international offshore wind turbines, offshore wind farms, wave energy, tidal energy, current energy projects. In order to maximum capacity yield to be identified the appropriate field it provides long-term meteorological and oceanographic data acquisition and extend an important contribution to the project's planning stages. After determining the appropriate area may be needed geophysical, geotechnical and ROV operations carried out in the company structure.

Environmental Impact Assessment Survey


Environmental Impact Assessment, determining positive and negative impacts on environment of projects planned to carry out, prevention of negative impacts or evaluation determining measures taken to minimize that extent of harms on the environmental, selected area and technology alternative and monitoring and controlling of project implementation, is the whole works.

SONARSEA, carries out all marine surveys of coastal and marine constructions that can be necessary within the scope of EIA such as fishing port, harbour, docks, break water, shipyard, maintenance-repair units, recreative areas, marine wind farms in tandem with EIA companies. During the EIA depend on project needs physical and biological environment components are investigated and within the scope of this, is offered solutions to matters such as seismicity, landslide, erosion, meteorological conditions, water quality, seabed habitat mapping, biodiversity and analysis of underwater noise.  



SONARSEA, provides data acquisition for modelling operations and can conduct the following modelling and analyzing operations with being in cahoots with scientific establishments.  

  • Thermal discharge modelling,
  • Sediment transportation modelling,
  • Wave climate and transformation analysis,
  • Numerical analysis of harbor analysis.

Underwater Noise Monitoring

In environmental monitoring operations performed before construction big-scale marine structures and after construction is carried out underwater acoustic measurement operations. In Underwater Noise Measurement, is listened underwater acoustic level by the wideband hydrophones. Underwater dominant noise level is determined analyzing acoustic signal, investigated its noise reasons and the possible effects of the biodiversity.