Published paper on the sound modelling around hydroacoustic sources
March 13th 2020
Max Schuster published a reviewed paper in the Journal of Ocean Technology together with his colleagues Dr. Dietrich Wittekind and Matthias Fischer as well as Mirjam Müller of the German Environment Agency.
While noise emissions are an unintentional by-product of shipping operations, hydroacoustic equipment such as multibeam sonars deliberately introduce high levels of noise into the subsea environment. In this paper, we model the sound field around a ship operating two types of hydroacoustic equipment, both in directions that are meant to be insonified and those that are not. A concept has been developed to quantify the accumulated noise exposure to a receiver in the water space around the ship. The paper describes the philosophy of the approach and the calculated sound exposure around the transmitting sound source for two typical systems.The results for noise exposure can be used to assess the effect on animal receivers with their respective characteristics.
The whole article can be found here.
This is a summary of work completed for and with the funding by the German Federal Environment Agency – the regulatory body for German vessels using airguns and scientific sonars for research in Antarctica. The research led to sound charts of typical instruments used (only two are described in this paper) and the exposure level of animals in the vicinity. The results are used by the agency to judge the risk for the animals and to possibly discuss regulations for the use of airguns and sonars in these waters.
Underwater Noise Research Project T-SCHALL
March 2nd 2020
The research project T-SCHALL is entering the second phase: Systematic Underwater Radiated Noise (URN) measurements of selected Mega-Yachts and Cruise Ships shall provide necessary validation data for the preliminary prediction model developed so far.
T-SCHALL considers the Low-Frequency Sound Radiation of Machinery Induced Noise into the Water (Tieffrequente Schallabstrahlung von Maschinengeräuschen ins Wasser). The aim of the project is to investigate the fundamental law of low-frequency sound-excitation, -propagation and -radiation from machinery to the ship hull into the water and implementing these in a prediction model. The model should provide relevant information in an early design stage of the ship to reduce time-consuming changes and adaptions in later project phases. The gained knowledge allows better prediction, avoidance of unnecessary mitigation measures,noise reduced operations and a higher acoustic quality. For cruisliners, which are likely to be the first to be subjected to underwater noise specifications a safe assessment of risk and a tool box of mitigation measures will be derived.
The motivation behind the research project is the increased awareness for underwater noise and its potentially harmful effects on marine life, especially marine mammals. The IMO, the European Union and Canada are very active in this field (e.g. the ECHO-program of the Vancouver Fraser Port Authority and several IMO initiatives).
The T-SCHALL project team, consisting of distinguished industrial and academic partners, has the ambition to set a new benchmark for feasible underwater noise signatures and stay on the forefront of research in this key technology. First results of the project are already used in current projects of the partners thus allowing more directed and less cost-intensive mitigation measures and reducing the acoustic footprint of the newbuilt vessels.
This project is part of the research program “Maritime Technologies of the next generation” of the Federal Ministry of Economics and Energy with the assistance of the Projektträger Jülich.
Panel discussion at the ifaw forum – involve. resolve.
February 25th 2020
Hamburg. At the annual ifaw forum – involve. resolve. Dr. Dietrich Wittekind was one of the key speakers in the panel discussion on underwater noise and its effects on marine life, especially marine mammals.
Dietrich Wittekind stated that improvement of underwater noise of ships can be achieved by using established engineering procedures to design propulsion systems. Beyond this, research is required to provide a reliable tool box for ship designers to reduce propeller noise emissions. Most ships dominating global underwater noise are built in the Far East and interest of relevant stake holders has to be raised to deal with the issue. Currently, commercial considerations (cheap ships) dominate all aspects.
IFAW is the International Fund for Animal Welfare. Its German branch is located in Hamburg.
ESI-Noise Measurements for Ships approaching the Port of Hamburg
December 20th 2019
Starting April 2020 the Rotterdam Port Authority and the Hamburg Port Authority will grant reductions on the port fees for those ships able to present an Airborne Noise certificate according the the ESI noise standard (Environmental Ship Index). This certificate according to ESI noise standard shows the acoustic characteristics of a ships noise emissions in port.
DW-ShipConsult is a certified service supplier for these measurements.
We offer to measure ship noise emissions and provide an ESI-Noise certificate. These measurements can be conducted concurrent to the usual harbour operation without any implications on ship operations.
Noise Measurements on Cruise Ships in German Ports
DW-ShipConsult conducted a study on Cruise Ship and Cruise Terminal emissions for the Hamburg Port Authority (HPA) during the Interreg Project „Green Cruise Port“. This study focused on the systematic documentation and evaluation of all sources for noise, air pollutants and green house gases (GHG) connected with the berthing of a Cruise Liner. To do that, DW-ShipConsult measured noise on board of several Cruise Ships, on the pier and at different noise contributors in port (e.g. busses, trucks, cargo handling, ventilation on the terminal roof, etc.).
Based on the analysis of the findings, mitigation measures where discussed and evaluated. Some measures like a LNG power pack or a power barge where also measured for its noise reduction potential for the whole terminal and ship.
The study provides recommendations for future Cruise Ship Terminal and Cruise Ship operation in ports with a minimum of noise, GHG or air pollutants emissions.
Released January 7th 2019