Reconstruction of Paleo-Wave Conditions During the Late Pleistocene from Marine Terrace Deposits, Monterey Bay, California

Dupré, W.R.

doi:10.1016/s0070-4571(08)70158-4

Cited by 12 publications

(12 citation statements)

References 22 publications

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“…In addition, although it is assumed here that the long‐term shoreline remained constant compared to the lifespan of a beach ridge, lake level oscillation in high‐frequency such as years would happen inevitably. Such frequent oscillation of lake level may contribute to beach‐ridge thickness (Dupré, ), and neglecting it would result in overestimating palaeowind strength, according to Fig. D.…”

Section: Discussion: Assessment Of the Beach‐ridge Thickness Techniqumentioning

confidence: 99%

“…Equation was derived from a flume tank experiment on conditions that waves approached the shoreline orthogonally. When waves approach obliquely, however, wave refraction should be taken into consideration (Dupré, ; Komar, ):

h_{normalru} = b K_{normalr} H_{normals}

K_{normalr} = \sqrt{\frac{cos α_{0}}{cos italicα}}

where K r is the refraction coefficient; α 0 is the angle (degrees) between incident wave ray and the normal to the isobaths (angle of incidence); and α is the angle (degrees) between refracted wave ray and the normal to the isobaths when waves approach near the shoreline (Fig. A).…”

Section: Principles and Methodsmentioning

confidence: 99%

“…Wave run-up in coastal regions has been the subject of numerous laboratory and field experiments since the 1940s, and it is commonly known that wave run-up height depends on particle properties such as size and density, wave climate including wave frequency and wave height, as well as beach slope (e.g. Bagnold, 1940;Dupr e, 1984;Silvester & Hsu, 1993;Lorang, 2002;Blenkinsopp et al, 2016;Matias et al, 2016). However, it is usually too difficult to decipher subtle parameters such as wave period and wavelength from rock records to apply the delicate equations proposed by, for example, Silvester & Hsu (1993), Lorang (2002), Blenkinsopp et al (2016).…”

Section: Waves On Lakesmentioning

confidence: 99%

“…Equation 3 was derived from a flume tank experiment on conditions that waves approached the shoreline orthogonally. When waves approach obliquely, however, wave refraction should be taken into consideration (Dupr e, 1984;Komar, 1998):…”

Section: Waves On Lakesmentioning

confidence: 99%

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A method to define the palaeowind strength from lacustrine parameters

et al. 2017

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Gravelly beach ridges, which are formed solely by swash processes, may accurately reflect past wave conditions. The thickness (or height) of a gravelly beach ridge approximately equals the height of wave inundation, which is the sum of the surge and wave run‐up. Their ancient counterparts, if well‐preserved and identified, can be used to estimate palaeowave conditions, which can later be converted to palaeowind intensities based on wind–wave relationships. A technique is described for estimating the palaeowind speed in this paper, which is referred to as the gravelly beach‐ridge thickness technique. By comparing these estimates with instrumental wind records obtained at a modern lake, Qinghai Lake in north‐western China, the beach‐ridge thickness technique is shown to be useful for estimating the average wind speed (Vavg). When applying this method to ancient fetch‐limited basins, five parameters are necessary: (i) the thickness of the isolated gravelly beach ridge; (ii) the average depth of the water body; (iii) the palaeofetch; (iv) the angle between the palaeowind direction and the normal to the shoreline; and (v) the particle size. This technique was applied to an ancient example in the Eocene Dongying Depression, located in eastern China. The results indicate that the average wind speed of the northern wind ranged between 2·27 m sec−1 and 8·36 m sec−1 from 45·0 Ma to 42·0 Ma, and displayed a generally decreasing trend that included early strengthening followed by weakening and later strengthening during this period. The beach‐ridge thickness technique provides a new perspective on delineating palaeowind conditions and can be applied to ancient fetch‐limited basins with gravelly beach ridges worldwide. Generally, if a water body is sufficiently large (fetch exceeding 40 km), deep (average depth exceeding 10 m) and waves (or winds) are determined to approach the shoreline with high angles (angle of incidence <35°), then the calculation errors will be small to negligible.

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Section: Discussion: Assessment Of the Beach‐ridge Thickness Techniqumentioning

confidence: 99%

h_{normalru} = b K_{normalr} H_{normals}

K_{normalr} = \sqrt{\frac{cos α_{0}}{cos italicα}}

Section: Principles and Methodsmentioning

confidence: 99%

Section: Waves On Lakesmentioning

confidence: 99%

Section: Waves On Lakesmentioning

confidence: 99%

See 2 more Smart Citations

A method to define the palaeowind strength from lacustrine parameters

et al. 2017

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“…Cant (1994Cant ( , 1995 described evidence for a tidal origin as the sharp bases of the conglomerates, the presence of mud and coal clasts, and the crossbedding. While Cant (1994Cant ( , 1995 cites the sharp bases as evidence of tidal influence, the erosional bases of the gravel deposits may represent the peak of storm events where gravel is eroded from the beach face and deposited in longshore troughs along the upper shoreface (Dupre, 1984;Masseri and Parea, 1988). The poor sorting of similar deposits has been attributed to mass-flow phenomena (Masseri and Parea 1988).…”

Section: Discussionmentioning

confidence: 99%