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Ocean Environmental data is a key component utilized by the United States Coast Guard (USCG) when developing and executing a search and rescue mission. The Search and Rescue Optimal Planning System (SAROPS) became operational with the USCG in 2007 and is the main tool for developing search and rescue mission plans. This tool utilizes environmental data (wind, ocean currents, etc.) to estimate the...
The acoustic properties including sound speed and the attenuation coefficient are important factors which determine the efficacy of acoustic equipments and targets detection of seafloor sediments. This paper presents a multi-mode acoustic in situ measurement system to be used in the deep sea. We analyzed the major system framework and relevant hardware and software. The proposed system provides two...
Operational ocean observing system (OOOS) can meet the needs of marine disaster prevention and reduction, safeguard socio-economic development in coastal zones, and promote marine resource exploitation. As a solid foundation for the establishment of the OOOS, operational ocean observing equipment (OOOE) is attached great significance across the world. Three kinds of OOOEs in China are introduced and...
Towed multiple-parameter profiling system, which is used to measure temperature, depth, turbidity, dissolved oxygen, pH, chlorophyll and other elements of the marine environment, is an important observation equipment to provide information on the marine environment. Based on the test for CZT1-2 towed multiple-parameter profiling system carried out in August 2011 in the Bohai Sea, we have studied the...
In order to study the geoacoustic relations for shallow water sediments, a project has started in 2014, bringing together French academic and industrial partners. One of this project objectives is to build a large database of acoustical and sedimentological parameters collected in-situ with specific devices. Therefore, an important task is to manage the data acquisition, storage, and exploitation...
After the nuclear accident in Fukushima, Japan, marine radioactivity monitoring has received more and more international attention. According to China's needs for marine radioactivity monitoring in the North Pacific Region, this paper introduces the design of a special system for deep-sea environmental radioactivity (DSER) online monitoring in the γ-ray energy spectrum. The system uses an improved...
Considerable interests in recent years have been directed towards the study of various mechanical devices to draw up deep ocean water (DOW), particularly the air-lift artificial upwelling devices. However, one of the obstacles which limit their application in open ocean mariculture is the difficulty in estimating the flow rate in the upwelling pipe. Conventionally, the water flow rate in the upwelling...
Conductivity, temperature and depth (CTD) are the most essential physical properties of sea water. CTD instrument is one of the most efficient approaches for collecting the accurate ocean information. However, traditional CTD instruments are not best suited for applications that require high resolution data by a large number of sensors because of their large size and high cost. This paper describes...
On the background of the compilation of a new round MFZ(marine functional zoning) in Tangshan, this paper take the method of integrating onsite survey and remote sensing survey, comprehensively considers the status quo of marine development and utilization, marine natural environment, social needs, economic and technical feasibility, then evaluates the existing natural coastline in Tangshan and defined...
The distance of conventional X-band microwave propagation over the sea surface is within ‘radio line-of-sight’ (RLOS) which limits its application in long-range land-buoy communication. To overcome the above limitation, evaporation duct (EVD) is employed as an alternative to the physical channel in the land-buoy communication and the corresponding communication distance could be extended to hundreds...
Turbulence plays a crucial role in ocean dynamics and global biogeochemical cycles through redistributing heat, salt and nutrients across isodensity surfaces. Conventionally, most of microstructure measurements were conducted with vertical freefall profilers. In order to provide both a very high resolution vertical distribution of turbulent quantities and the long term series, a novel instrument MRVP...
As the continuous accumulation of knowledge for the Ocean, it is universally acknowledged that there is an evergrowing awareness of the vital importance of the ocean in whatever aspects. Temperature and conductivity, as basic hydrological parameters of the Ocean, play extremely important roles in marine resource recognition, exploitation and utilization. The paper designs a underwater inductive coupling...
In this study we try to identify the thermal dispersion characteristics of coastal waters to consider their physical properties using a field observation and a three-dimensional numerical modeling with CFD (Computational Fluid Dynamics). A plume model and observed CTD data was used to predict the mixing behavior of thermal discharges in coastal waters of Tarawa, Kiribati. The elevation, current, temperature...
This paper proposes a method for attitude estimation that utilizes the depth measurement as well as the MEMS-AHRS (Micro-electromechanical systems Attitude Heading Reference System). Estimating attitude in real-time is crucial for navigation of an unmanned underwater vehicle since path planning, trajectory tracking, and collision-avoidance is based on the attitude information. Many of the attitude...
Laser Induced Breakdown Spectroscopy (LIBS) is an analytical technique for rapid chemical sensing that is becoming increasingly in field applications. LIBS is a form of atomic emission spectroscopy. When a high-powered pulsed laser beam is focused on the sample, it produces a plasma that emits wavelengths of light that can be observed using a spectrograph to identify the composition of the target...
Along with the construction and development of Global Navigation Satellite System (GNSS) technology, GNSS has been widely and increasingly used in the ocean field, such as offshore wind retrieval, sea ice observation, sea state monitoring et al. Researchers from National Ocean Technology Center take advantage of GNSS satellites signal Doppler shift to measure the buoy state, then inverse the wave...
In this article the wave energy density of the northern Sicilian coasts is evaluated and is used to evaluate the producibility of a wave nergy converter to be installed in an area in the north west part of Sicily. In particular, the objective of the study is the evaluation of a potential installation in an area between Trapani and Palermo, which are the largest cities in the north west part of Sicily...
Marine survey is one of the most important methods for oceanic research. During the marine survey process, some collected samples will be distributed in-situ to scientists. In order to effectively manage the sample data, corresponding relations of sample type should be established between the actual distributed sample records and the prior sample applications. This matching result can provide the...
In this paper, an approach is presented to retrieve ionospheric total electron content (TEC) over oceans from Global Navigation Satellite System-Reflectometry (GNSS-R) delay-Doppler map (DDM). Here, an additional ionospheric delay (τI) is considered in the conventional DDM simulation process. Based on this, the least squares (LS) fitting method is employed for TEC retrieval by fitting the simulated...
The characterization of underwater ambient noise using time frequency representations (TFRs) is challenging due to the opulence of the potential information that can be extracted from it. Traditionally Short Term Fourier Transform (STFT) is used to observe underwater ambient noise sources from the signal received by sonar. Short term Fourier Transform is a class of distributions determined by window...
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