Institute for Marine and Coastal Research of the University of Dubrovnik and the Hydrographic Institute of the Republic of Croatia – Split conducted field research within the CoRE project from 28th of March till 10th of April 2017. Project „CoRE“ is EU/IPA project under component II, measure 1.1 Joint actions for environment, nature and cultural heritage protection.
The equipment purchased within the CoRE project was used at chosen locations in the Dubrovnik-Neretva County and the Montenegrin Coast.
The objectives of the CoRE project are producing a new nautical chart with updated hydrographical measurements (waterways – navigation safety / conserved habitats) and safety recommendations based on the conducted researches and gathered data, concerning natural changes of coast line border in the Republic of Croatia and Montenegro under the influence of erosion and waves. To accomplish mentioned objectives purchased equipment were used: C-MAX’s CM2 Side Scan Sonar – SSS, Datawell directional wave rider buoy DWR MK3, Multi-beam, RDI Acoustic Doppler Current Profiler, Hanna Multi Parameter Probe and Herbarium.
Side-scan sonar is used to conduct surveys for marine archaeology; in conjunction with seafloor samples it is able to provide an understanding of the differences in material and texture type of the seabed. Side-scan sonar imagery is also a commonly used tool to detect debris items and other obstructions on the seafloor that may be hazardous to shipping or to seafloor installations by the oil and gas industry. In addition, the status of pipelines and cables on the seafloor can be investigated using side scan sonar. Side scan data are frequently acquired along with bathymetric soundings and sub-bottom profiler data, thus providing a glimpse of the shallow structure of the seabed. Side scan sonar is also used for fisheries research, dredging operations and environmental studies. It also has military applications including mine detection.
The high quality data obtained by the Side scan sonar and Multibeam are used for displaying and mapping the seabed, producing maps and 3D images. The measured data were supplemented by geological sampling of the sea bottom in order to obtain all the necessary data for the new nautical chart. The mentioned equipment was used near port of Ploče and Dubrovnik.
During the research on the Neretva estuary, multi-parameter probe was used. Samples of plants were collected and herbarized for plant communities determination. An additional analysis of the sea bottom was performed by ROV for the purpose of analyzing the benthic communities and the sea bottom type by means of photographs and video analysis.
Directional wave rider was deployed near the islet of St. Andrija. It measures the height, direction, and period of the wind induced waves. Measured data is then transmitted via HF link to the computer. The maximum recorded wave after just 2 weeks of measurements was 6.02 m during a short episode of strong sirocco wind.
Acoustic Doppler current profilers emit sound waves, the traveling time of sound waves gives an estimate of the distance. The frequency shift of the echo is proportional to the water velocity along the acoustic path. Using multiple waves in different directions, the velocity and direction of current can be determined in several dozens of layers in the sea, depending on the frequency of the signal being transmitted.
Act. Director / project manager: Vinka Kolić, firstname.lastname@example.org, +385(0) 21 308 803