SAR Observation of Rip Currents off the Portuguese Coast

Silva, J. C. B. da

doi:10.1007/978-1-4020-6772-3_30

Cited by 8 publications

(14 citation statements)

References 11 publications

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“…Another approach is remote sensing, and this has been used in a number of studies primarily to investigate rip currents. These studies include shore-deployed ARGUS video cameras (see review by [8]), sector-scanning Doppler sonar [9], [10], VHF and microwave Doppler radar [11], [12], and satellite-borne synthetic aperture radar [13]. Recent reviews of remote sensing of rip currents and the nearshore are given by [14] and [15].…”

Section: Introductionmentioning

confidence: 99%

Infrared Remote Sensing of Surf-Zone Eddies

Marmorino

Smith

Miller

2013

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Airborne infrared imagery is used for the first time to investigate characteristics of surf-zone eddies, occurring along an along-shore uniform beach. Eddies are found to have diameters of 100 to 150 m, an alongshore spacing of about 375 m (2.5 times the surf-zone width), and lifetimes of 40 min and longer. Eddies travel alongshore at speeds of 0.3 to 0.5 m/s, at a distance from the shoreline of about 1.3 surf-zone widths. Eddies are also observed to move directly offshore, two surf-zone widths from the shoreline. Fine-scale thermal structure within an eddy includes 6-m-wide cold patches, possibly the surface imprints of bottom-induced turbulence, and a small ( 10-m wide) 'cold core', likely from accumulation of surfactant by radially inward surface flow. Visualization of an eddy is enhanced through flow deformation of surfactant slicks. In particular, narrow slicks appear to be wound-up by an eddy into spirals similar in form to those of a free vortex. In this sense, these nearshore eddies resemble ocean sub-mesoscale 'spiral eddies' as seen in synthetic-aperture radar and sunglint imagery.

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Section: Introductionmentioning

confidence: 99%

Infrared Remote Sensing of Surf-Zone Eddies

Marmorino

Smith

Miller

2013

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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“…Some signatures of rip currents were identified in the central enlarged area along the coast in the SAR image, as shown in Figure 2c. Bright elongated cells extending offshore from the coast are inferred to be the rip currents [28]. In addition, there are some irregular bright bands in the sand bar, which could be further analyzed by geologists.…”

Section: Ocean Wind Wave and Rip Currentmentioning

confidence: 99%

HISEA-1: The First C-Band SAR Miniaturized Satellite for Ocean and Coastal Observation

et al. 2021

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On 22 December 2020, HISEA-1, the first C-band SAR small satellite for ocean remote sensing, was launched from the coastal Wenchang launch site. Though small in weight, the images it produced have a high spatial resolution of 1 m and a large observation width of 100 km. The first batch of images obtained within the first week after the launch confirmed the rich information in the data, including sea ice, wind, wave, rip currents, vortexes, ships, and oil film on the sea, as well as landmark buildings. Furthermore, geometric characteristics of sea ice, wind vector, ocean wave parameter, 3D features of buildings, and some air-sea interface phenomena in dark spots could also be detected after relevant processing. All these indicate that HISEA-1 could be a reliable, remarkable, and powerful instrument for observing oceans and lands.

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“…They increase in intensity and decrease in number as wave height increases, and they can vary in intensity and location in time. Typical rip velocities are between 0.3 and 1 m/s and can easily exceed 1 m/s during high-energy conditions and short periods (of the order of 10 minutes) due to its nonstationary character (SILVA, SANCHO, and QUARESMA, 2006).…”

Section: Study Areamentioning

confidence: 99%