The Application of Video Image Processing to the Study of Nearshore Processes

Holman, Robert A.; Sallenger, Asbury H.; Lippmann, T. C.; Haines, John W.

doi:10.5670/oceanog.1993.02

Cited by 172 publications

(102 citation statements)

References 9 publications

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“…By averaging over shorter wave time scales, clutter was removed leaving an image showing patterns of enhanced wave dissipation that have been shown to correspond well to submerged sand bar or shoreline features (Lippmann and Holman, 1989;Holman et al, 1993;Lippmann et al, 1993;Holland et al, 1997;Holland, 1998;Ruessink, 2003a, 2003b;Plant et al, 2007;Pearre and Puleo, 2009). Since imaging is low cost and can span large areas, time exposure imaging has offered an excellent tool for long-term studies and was the method selected here for exploring the details of ebb-tidal delta morphology.…”

Section: Remote Sensing Argus Systemmentioning

confidence: 99%

Mobility of meso-scale morphology on a microtidal ebb delta measured using remote sensing

2014

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Section: Remote Sensing Argus Systemmentioning

confidence: 99%

Mobility of meso-scale morphology on a microtidal ebb delta measured using remote sensing

2014

Self Cite

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“…This is not well proven or documented, but for a plane beach there is a family of these eddy-type solutions, of which Hill's spherical vortex [Lamb, 1932] Perhaps the biggest challenge, however, is to measure velocities over the whole surf zone at once, preferably in such a way that the incident wave motions can be separated out, in other words, to obtain the kind of synoptic view of surf zone currents and structures presently provided by numerical models. The impressive recent work on video imaging [Holman, 1993] [Boyd, 1987] and common Chebyshev techniques for finite intervals [Canuto et al, 1987] are combined in order to reach the highest resolution at the peak and at the sea face of the mean velocity profile. Other models, based on combining existing hydrodynamical software, have also been used successfully [see Damgaard, 1993 …”

Section: Ozkan-haller and Kirby [1999] (Using A Numerical Model Develmentioning

confidence: 99%

Shear instabilities of wave‐driven alongshore currents

Dodd¹,

Iranzo²,

Reniers³

2000

Reviews of Geophysics

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Abstract. The present state of research into and understanding of shear waves is appraised. In this paper these motions, which result from an instability of an alongshore, wave-driven current, are described, their theoretical explanation is recounted, and the history of their discovery is related. The various investigations into their genesis, which attempted to develop an understanding of when and why they occur, are summarized, and more recent research into their finite amplitude development is discussed, focusing on the understanding gained. Attention is also given to observations of shear waves made in the field and attempts to observe them in the laboratory. Finally, work that still needs to be done is described. INTRODUCTIONThe nearshore region called the surf zone has been so intensively investigated over the last 30 years, in theoretical and numerical studies, laboratory experiments, and field campaigns, that it is rare nowadays for a completely new phenomenon to be discovered. It was therefore a great surprise to the "nearshore community" to discover that precisely such an event was unfolding when preliminary results of the analysis of data from the SUPERDUCK experiment of 1986 were presented at the The observations were noteworthy for a number of reasons: (1) They were highly coherent, low-frequency, wave-like motions; (2) they occurred apparently only when the longshore current was present; (3) their kinematics were dependent on the longshore current orientation and strength; and (4) these kinematics revealed them to be distinct from any other previously observed nearshore motion.The observations, which were soon presented in a full particularly, velocity components (see Figure 1).However, these motions only occurred in the presence of a strong longshore current, and the stronger the current was, the more energetic the motions were. Furthermore, the motions were remarkable for possessing an alongshore speed of propagation proportional to the longshore current strength and orientation (i.e., they would propagate with the current), and interestingly, all such frequencies would propagate at the same speed, given constant current conditions (i.e., they were nondispersive). Finally, the observed alongshore wavelengths (periods) were between about 50 and 300 m (50 and 1000 s). These properties distinguished the motions from previously recognized IG waves, most notably alongshore propagating edge waves and oblique leaky modes [see, e.g., Oltman-Shay and Guza, 1987; OltmanShay and Howd, 1993]. In fact, these motions possessed a very distinct position in frequency-wavenumber (cok) space, as can be seen in Figure 2, and are clearly not (known) leaky or trapped surface gravity modes. (In this

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“…Ngoài những chuyến thực ñịa bằng các dụng cụ và thiết bị truyền thống, hiện nay, chúng ta có thể thực hiện ño vẽ ñường bờ bằng các thiết bị GPS, bằng các ảnh kỹ thuật số, hoặc bằng hệ thống máy camera video [4,5,6,12]. Bên cạnh ñó, ñường bờ còn có thể thu ñược trên một phạm vi rộng lớn từ các ảnh máy bay và ảnh vệ tinh.…”

Section: Giới Thiệuunclassified

Ứng Dụng Viễn Thám Và Gis Trong Theo Dõi Và Tính Toán Biến Động Đường Bờ Khu Vực Phan Thiết

Thao¹,

Duẩn²,

Tỏ³

2012

TC KH&CN Biển

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I. GIỚI THIỆUNgày nay, với sự tích hợp khéo léo của công nghệ viễn thám và GIS, việc theo dõi và tính toán các biến ñộng ñường bờ ñược thực hiện khá nhanh chóng và hiệu quả. Ngoài những chuyến thực ñịa bằng các dụng cụ và thiết bị truyền thống, hiện nay, chúng ta có thể thực hiện ño vẽ ñường bờ bằng các thiết bị GPS, bằng các ảnh kỹ thuật số, hoặc bằng hệ thống máy camera video [4,5,6,12]. Bên cạnh ñó, ñường bờ còn có thể thu ñược trên một phạm vi rộng lớn từ các ảnh máy bay và ảnh vệ tinh. Từ các dữ liệu ñó, việc ñánh giá và phân tích diễn biến ñường bờ ñược thực hiện trực tiếp hoặc có thể ñưa vào công cụ GIS ñể tính toán tốc ñộ thay ñổi ñường bờ.Tuy công nghệ viễn thám và GIS ở Việt Nam phát triển muộn hơn rất nhiều so với thế giới nhưng nước ta cũng ñã ñạt ñược một số kết quả nghiên cứu nhất ñịnh. Về ứng dụng viễn thám trong phân tích và ñánh giá biến ñộng ñường bờ, một số nghiên cứu ñã

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The Application of Video Image Processing to the Study of Nearshore Processes

Cited by 172 publications

References 9 publications

Mobility of meso-scale morphology on a microtidal ebb delta measured using remote sensing

Mobility of meso-scale morphology on a microtidal ebb delta measured using remote sensing

Shear instabilities of wave‐driven alongshore currents

Ứng Dụng Viễn Thám Và Gis Trong Theo Dõi Và Tính Toán Biến Động Đường Bờ Khu Vực Phan Thiết

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