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SLOPE DISTRIBUTION IN FRONT—BACK ASYMMETRIC STOCHASTIC LAGRANGE TIME WAVES

G. LINDGREN
Advances in Applied Probability
Vol. 42, No. 2 (JUNE 2010), pp. 489-508
Stable URL: http://www.jstor.org/stable/25683830
Page Count: 20
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
SLOPE DISTRIBUTION IN FRONT—BACK ASYMMETRIC STOCHASTIC LAGRANGE TIME WAVES
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Abstract

The stochastic Lagrange wave model is a realistic alternative to the Gaussian linear wave model, which has been successfully used in ocean engineering for more than half a century. In this paper we present the slope distributions and other characteristic distributions at level crossings for asymmetric Lagrange time waves, i.e. what can be observed at a fixed measuring station, thereby extending results previously given for space waves. The distributions are given as expectations in a multivariate normal distribution, and they have to be evaluated by simulation or numerical integration. Interesting characteristic variables are the slope in time, the slope in space, and the vertical particle velocity when the waves are observed close to instances when the water level crosses a predetermined level. The theory has been made possible by recent generalizations of Rice's formula for the expected number of marked crossings in random fields.

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