Łukasz Janowski

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• PhD
• Researcher at Gdynia Maritime University

The ocean, covering 71% of Earth’s surface, remains largely unexplored due to the challenges of the marine environment. This study focuses on the Kuźnica Deep in the Baltic Sea, aiming to develop an automatic seabed mapping methodology using multibeam echosounders (MBESs) and machine learning. The research integrates various scientific fields to en...

This study introduces a novel methodology for estimating and analysing coastal cliff degradation, using machine learning and remote sensing data. Degradation refers to both natural abrasive processes and damage to coastal reinforcement structures caused by natural events. We utilized orthophotos and LiDAR data in green and near-infrared wavelengths...

The very shallow marine basin of Puck Lagoon in the southern Baltic Sea, on the Northern coast of Poland, hosts valuable benthic habitats and cultural heritage sites. These include, among others, protected Zostera marina meadows, one of the Baltic's major medieval harbours, a ship graveyard, and likely other submerged features that are yet to be di...

The digital representation of seafloor, a challenge in UNESCO’s Ocean Decade initiative, is essential for sustainable development support and marine environment protection, aligning with the United Nations’ 2030 program goals. Accuracy in seafloor representation can be achieved through remote sensing measurements, including acoustic and laser sourc...

Accurate, detailed, and high-frequent bathymetry, coupled with complex semantic content, is crucial for the undermapped shallow seabed areas facing intense climatological and anthropogenic pressures. Current methods exploiting remote sensing images to derive bathymetry or seabed classes mainly exploit non-open data. This lack of openly accessible b...

The very shallow marine basin of Puck Lagoon in the southern Baltic Sea, on the Northern coast of Poland, hosts valuable benthic habitats and cultural heritage sites. these include, among others, protected Zostera marina meadows, one of the Baltic's major medieval harbours, a ship graveyard, and likely other submerged features that are yet to be di...

Limited visibility in the underwater environment often restricts opportunities for archaeological prospection. Especially in reservoirs with a high content of suspended solids, methods based on acoustics prove to be extremely useful. This study represents the first high‐resolution acoustic mapping and archaeological prospections of the Old Oder Can...

Despite covering over 70% of the Earth's surface, less than 20% of the seafloor has been spatially explicitly mapped (Coley, 2022). Current global initiatives aim to change this state of knowledge and generate a global map of the seafloor with reasonable resolution by 2030 (Mayer et al., 2018). This challenge will require tremendous efforts in term...

Shallow coastal areas are among the most inhabited areas and are valuable for biodiversity, recreation and the economy. Due to climate change and sea level rise, sustainable management of coastal areas involves extensive exploration, monitoring, and protection. Current high-resolution remote sensing methods for monitoring these areas include bathym...

Glacial landforms are a significant element of landscape in many regions of Earth. The increasing availability of high-resolution digital elevation models (DEMs) provides an opportunity to develop automated methods of glacial landscape exploration and classification. In this study, we aimed to: 1) identify glacial landforms based on high-resolution...

Abstract: Acoustic seafloor measurements with multibeam echosounders (MBESs) are currently often used for submarine habitat mapping, but the MBESs are usually not acoustically calibrated for backscattering strength (BBS) and cannot be used to infer absolute seafloor angular dependence. We present a study outlining the calibration and showing absolu...

Benthic habitat mapping is a rapidly growing field of underwater remote sensing studies. This study provides the first insight for high-resolution hydroacoustic surveys in the Slupsk Bank Natura 2000 site, one of the most valuable sites in the Polish Exclusive Zone of the Southern Baltic. This study developed a quick and transparent, automatic clas...

Exploration of the marine environment using underwater remote-sensing methods is the most reasonable method for investigating submerged archaeological heritage sites, preserving their current condition and maintaining them for future generations. While non-invasive recognition of heritage sites is one of the main objectives of underwater archaeolog...

One of the main challenges of underwater archaeology is to develop non‐invasive research of heritage sites in order to enable their further protection for future societies. This study aims to explore, identify and classify archaeological objects in a shallow lake using underwater acoustics. We solved the aforementioned challenges by developing an i...

Scientific exploration of seabed substrata has significantly progressed in the last few years. Hydroacoustic methods of seafloor investigation, including multibeam echosounder measurements, allow us to map large areas of the seabed with unprecedented precision. Through time-series of hydroacoustic measurements, it was possible to determine areas wi...

Automatic methods of seafloor mapping are still in their early stage of development, despite the technical progress made in recent years. A serious imperfection is the limited types of predictor features available for seabed classification. It is therefore desirable to introduce new class of spectral features to benthic habitat mapping. In this stu...

This paper discusses successive changes in the evolution of the fluvial system observed throughout the Bła ˛ dzikowo Formation at the Mrzezino key site in northern Poland. The study focuses on the development of fluvial sedimentation during Marine Isotope Stage 7. The sedimentary record of the Pleistocene at the study site shows a well-developed se...

Recently, the rapid development of the seabed mapping industry has allowed researchers to collect hydroacoustic data in shallow, nearshore environments. Progress in marine habitat mapping has also helped to distinguish the seafloor areas of varied acoustic properties. As a result of these new developments, we have collected a multi-frequency, multi...

Seafloor mapping is a fast developing multidisciplinary branch of oceanology that combines geophysics, geostatistics, sedimentology and ecology. One of its objectives is to isolate distinct seabed features in a repeatable, fast and objective way, taking into consideration multibeam echosounder (MBES) bathymetry and backscatter data. A large-scale a...

Tidal channels are crucial for the functioning of wetlands, though their morphological properties, which are relevant for seafloor habitats and flow, have been understudied so far. Here, we release a dataset composed of Digital Terrain Models (DTMs) extracted from a total of 2, 500 linear kilometers of high-resolution multibeam echosounder (MBES) d...

Marine seafloor mapping is a relatively young branch of underwater acoustics, related with geology and ecology. One of its objectives is to separate distinct seabed features in a fast, repeatable and objective way, taking into account multibeam echosounder (MBES) bathymetry and backscatter data. The backscatter data are often analyzed in an image p...

Development of Multibeam Echo-Sounder systems (MBES), which took place in the last twenty years gives a lot of opportunities to explore the seabed with very high resolution comparable to those of other land and air remote sensors. Two types of MBES data (bathymetry and backscatter) can be combined and used for mapping of underwater geomorphological...

Recent technological developments of multibeam echosounder systems (MBES) allow mapping of benthic habitats with unprecedented detail. MBES can now be employed in extremely shallow waters, challenging data acquisition (as these instruments were often designed for deeper waters) and data interpretation (honed on datasets with resolution sometimes or...

Backscatter and bathymetry data from Multibeam Echo-Sounder (MBES) provides many information about seafloor morphology and sediment type. Not without importance is also a large improvement of acoustic devices and computing power which takes place last time. Within the largest lagoon of the Mediterranean Sea - Venice Lagoon, tidal channel’s habitats...

Bathymetry and backscatter data from Multibeam Echo-Sounder (MBES) give a lot information about characteristics of the seafloor. Recent developments of acoustic devices and computing power have substantially improved the resolution of bathymetry and backscatter intensity measurements. The results of the post-processing of MBES data are raster image...

Coastal and transitional environments undergo strong morphological changes due to natural and anthropogenic pressure. In these environments the bathymetric surveys are extremely important for: a) monitoring of the long term environment evolution; b) managing the changes. The recent technological development of the multibeam systems enables them to...

Habitat mapping based on acoustic remote sensing methods has rarely been carried in ultra-shallow coastal transitional systems such as lagoons and estuaries. This is due to a number of practical and conceptual issues, including very shallow bathymetries, fine-scale patterns and processes, continuous environmental and biological gradients, high temp...