台风影响下海滩前滨剖面时间变化差异性分析

doi:10.11978/j.issn.1009-5470.2009.06.001

Abstract

Abstract:

Using the hourly data at six fixed sites (Pegs 1-6) for foreshore profile during Typhoon Prapiroon (Typhoon No. 0606) and severe tropical storm Bopha (No. 0609) from August 2-16, 2006, the authors analyze the characteristics of temporal changes in beach elevation based on one-dimensional optimal wavelet packet transform. The results are as follows. (1) The temporal change is dominated by 2-5 day period for Pegs 1 and 2 at the upside of the profile, reflecting the recovery process of the profile before and after the storms.(2) The heights of the four pegs at the mid-lower portion of the profile, with a periodical variation of 2-4 hours, showed a short-term erosion caused by storms, which resulted in a quick adjustment of the profile topography and the influence of diurnal tidal fluctuation on the beach front heights. (3) The temporal points with abrupt change in high-frequency scale of the pegs reflected the mutability of the profile topography under the influences of storm surge set-up and advance-and-retreat of sand bars in the surf zone.(4) The topography changes in low-frequency scale at the pegs indicated a trend towards stable accumulation and recovery of the profile topography after the storms.

Key words: typhoon, foreshore profile, temporal change, optimal wavelet packet transform

CHEN Zi-shen,WANG Yang-sheng,HUANG De-quan,LIU Meng-wei. Analysis on temporal change of foreshore profile under tropical storms[J].Journal of Tropical Oceanography, 2009, 28(6): 1-6.

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Analysis on temporal change of foreshore profile under tropical storms

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