Possibilities of optical remote sensing of dispersed oil in coastal waters

Haule, Kamila; Freda, Włodzimierz; Darecki, Mirosław; Toczek, Henryk

doi:10.1016/j.ecss.2016.07.013

Cited by 16 publications

(23 citation statements)

References 49 publications

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“…One of the main problems related to the use of visible bands for detecting oil spills is that the signal reflected by the oil film is not unique but it may change depending on several factors (and on their mutual combinations) such as sun/satellite geometry and sea surface roughness. As a consequence, oil spill can appear, in VIS and NIR bands, less or more reflecting than seawater [37,38,40,42]. It is referred to as a "positive" contrast when the reflectance of oil spill is higher than that of the clear seawater and as a "negative" one when the reflectance of oil spill is less than that of the clear seawater.…”

Section: Methodsmentioning

confidence: 99%

“…More recent studies on optical models [37,38,40,42] demonstrated that the acquisition angle, combined with a particular irradiation geometry, may enhance the reflectance contrast between oil and the surrounding water [13,22,25,32]. One of the main problems related to the use of visible bands for detecting oil spills is that the signal reflected by the oil film is not unique but it may change depending on several factors (and on their mutual combinations) such as sun/satellite geometry and sea surface roughness.…”

Section: Methodsmentioning

confidence: 99%

“…Due to the thermal inertia of oil, which is lower than seawater, oil-polluted areas usually have the opposite behavior compared with the surrounding oil-free seawater, with higher brightness temperatures in TIR images collected in daytime and lower brightness temperatures during the nighttime [35,36]. Also in the visible (VIS) and near-infrared (NIR) regions of the electromagnetic spectrum it is possible to detect the presence of an oil layer on the sea surface thanks to the different reflectance of the two elements [22,33,[37][38][39][40][41][42]. The main limits of these methodologies are related to their applicability only to particular geometries of observation [32], and their poor level of automation due to the need for several interventions of an operator (e.g., region of interest identification and visual recognition) [33,[43][44][45].…”

Section: Introductionmentioning

confidence: 99%

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A MODIS-Based Robust Satellite Technique (RST) for Timely Detection of Oil Spilled Areas

et al. 2017

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Natural crude-oil seepages, together with the oil released into seawater as a consequence of oil exploration/production/transportation activities, and operational discharges from tankers (i.e., oil dumped during cleaning actions) represent the main sources of sea oil pollution. Satellite remote sensing can be a useful tool for the management of such types of marine hazards, namely oil spills, mainly owing to the synoptic view and the good trade-off between spatial and temporal resolution, depending on the specific platform/sensor system used. In this paper, an innovative satellite-based technique for oil spill detection, based on the general robust satellite technique (RST) approach, is presented. It exploits the multi-temporal analysis of data acquired in the visible channels of the Moderate Resolution Imaging Spectroradiometer (MODIS) on board the Aqua satellite in order to automatically and quickly detect the presence of oil spills on the sea surface, with an attempt to minimize "false detections" caused by spurious effects associated with, for instance, cloud edges, sun/satellite geometries, sea currents, etc. The oil spill event that occurred in June 2007 off the south coast of Cyprus in the Mediterranean Sea has been considered as a test case. The resulting data, the reliability of which has been evaluated by both carrying out a confutation analysis and comparing them with those provided by the application of another independent MODIS-based method, showcase the potential of RST in identifying the presence of oil with a high level of accuracy.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A MODIS-Based Robust Satellite Technique (RST) for Timely Detection of Oil Spilled Areas

et al. 2017

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“…The influence of oil-in-water emulsion 25 on the absorption coefficient of seawater was researched by Otremba (2007) as well as Haule and Freda (2016), while the influence on scattering properties has been tested by Freda (2014). The consequence of changes in IOPs for remote detection of oil-in-water emulsion has been discussed by Otremba et al (2013);Otremba (2016); Haule et al (2017).…”

Section: Measurements Of Iops In Southern Balticmentioning

confidence: 99%

Seasonal variability of upwelling radiance polarization over the Southern Baltic surface

Freda

2017

Preprint

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Abstract. Polarization of light may be used to improve the remote colour sensing of sea water. This can be done in a number of ways, such as limiting of sun glints, obtaining information about atmospheric aerosol properties for atmospheric correction as well as improving the interpretation of the water-leaving signal results. However polarization signals at the top of atmosphere (ToA), that include the water-leaving signal, is strongly influenced by atmospheric molecular scattering and by direct sun and sky reflections from sea surface. For these reasons, it is necessary to better understand the factors that change the polarization of 5 light in the atmosphere-ocean system. In this paper, the influence of seasonal variability of inherent optical properties (IOPs), wind speed and solar zenith angle (SZA) on the polarization of upwelling radiance over the sea surface is discussed. The presented results come from Monte Carlo simulations, which used averaged measurements of IOPs, collected for several years, as input data. The effects of simulations are presented in the form of polar plots of the upwelling radiance degree of polarization (DoP). The results indicate that regardless of the wavelength and type of water, the highest value of the above water DoP is 10 strongly correlated with the absorption-to-attenuation ratio. The correlation is a power function and it depends on both the SZA and the wind speed. The correlation versatility for different wavelengths is very unusual in optics of the sea and is therefore worth emphasizing.

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“…An above-water remote-sensing-reflectance (R rs ) meter [4,5] would be a useful device to detect oil through the observation of changes in a light stream coming from the water column. Therefore, according to the definition of the R rs in Equation (1), the model for the detection of "clouds" of oil droplets suspended in the sea described in this paper refers to the vertical reflected radiance (L r ) formed under the defined incident above water solar vector irradiance (E i ).…”

Section: Introductionmentioning

confidence: 99%

Oil Droplet Clouds Suspended in the Sea: Can They Be Remotely Detected?

Otremba

2016

Remote Sensing

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Oil floating on the sea surface can be detected by both passive and active methods using the ultraviolet-to-microwave spectrum, whereas oil immersed below the sea surface can signal its presence only in visible light. This paper presents an optical model representing a selected case of the sea polluted by an oil suspension for a selected concentration (10 ppm) located in a layer of exemplary thickness (5 m) separated from the sea surface by an unpolluted layer (thickness 1 m). The impact of wavelength and state of the sea surface on reflectance changes is presented based on the results of Monte Carlo ray tracing. A two-wavelength index of reflectance is proposed to detect oil suspended in the water column (645-469 nm).

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Possibilities of optical remote sensing of dispersed oil in coastal waters

Cited by 16 publications

References 49 publications

A MODIS-Based Robust Satellite Technique (RST) for Timely Detection of Oil Spilled Areas

A MODIS-Based Robust Satellite Technique (RST) for Timely Detection of Oil Spilled Areas

Seasonal variability of upwelling radiance polarization over the Southern Baltic surface

Oil Droplet Clouds Suspended in the Sea: Can They Be Remotely Detected?

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