Analysis of morphodynamical processes with a nautical X-band radar

Wolff, U.; Seemann, J.; Senet, C.M.; Ziemer, F.

doi:10.1109/igarss.1999.772056

Cited by 3 publications

(2 citation statements)

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“…Kilcher and Nash [1] gave a comprehensive review on "tidal plume fronts" (in their terminology) which are formed by ebb discharge from a river's mouth. Visual observations [2], instrumental observations [1,3,4], marine radar observations at grazing angle (e.g., [1,5,6]), and radar observations from space (e.g., [7,8]) are the major means of detecting and following river plume fronts with the main purposes of elucidating the spatial and temporal behavior of the fronts, mixing processes, flow structures of river and sea water, and propagation dynamics. Garvine and Monk [2] made field observations of vertical distributions of current velocity, water temperature, and salinity at the mouth of the Connecticut River, USA.…”

Section: Introductionmentioning

confidence: 99%

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Visibility of River Plume Fronts with an X-Band Radar

Takewaka

2016

Journal of Sensors

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A land-based X-band radar was employed to observe river plume fronts at the mouth of the Tenryu River, Japan. Time-averaged radar images captured fronts extending offshore from the river’s mouth as bright streaks. Comparisons between satellite optical images and radar images confirm that streaky features in the radar image represent color river plume fronts. Further corroboration comes from field observations of water temperature, salinity, and turbidity conducted simultaneously with the radar measurements. When a survey ship crossed the front, the measured properties varied discontinuously, suggesting that water from the river and sea converged there and also that a downwards current was present. Variation of visibility of the fronts was assessed and compared with the rate of variation of water level and the wind speed and direction. The radar is able to image fronts when the water level is decreasing during ebb tide and the wind speed is over 3 m/s along shore. Surface ripple waves are generated by the local wind, and if they propagate across the front, wave heights increase, causing higher backscatter of the emitted radar beam. This observation gives further evidence on the imaging mechanism of river plume fronts with X-band radars in relation to wind direction.

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Section: Introductionmentioning

confidence: 99%

“…Wolff et al [6] used an X-band imaging radar mounted on the island of Sylt in Germany to observe coastal waves, morphological changes, tide stream patterns, and other features. They averaged the radar images in time to extract 2 Journal of Sensors static signatures and to discuss the flow patterns of tidal cycles.…”

Section: Introductionmentioning

confidence: 99%