热带海洋学报
熱帶海洋學報
열대해양학보
JOURNAL OF TROPICAL OCEANOGRAPHY
2009年
6期
1-6
,共6页
陈子燊%王扬圣%黄德全%刘萌伟
陳子燊%王颺聖%黃德全%劉萌偉
진자신%왕양골%황덕전%류맹위
台风%前滨剖面%时间变化%最优小波包变换
檯風%前濱剖麵%時間變化%最優小波包變換
태풍%전빈부면%시간변화%최우소파포변환
typhoon%foreshore profile%temporal change%optimal wavelet packet transform
利用2006年8月2日至16 日0606号台风"派比安"和0609号强热带风暴"宝霞"影响期间于粤东后江湾中部海滩前滨设置的地形剖面6个同定观测桩点上连续318h的逐时高度观测值,基于一维最优小波包变换方法.分析了极端波况影响下前滨剖面不同高度固定点的时间变化特征,主要结果为:(1)位于剖面冲流作用上部的桩点1、2时间变化过程以2-5d的周期为主,反映了台风作用前后剖面的波动过程;(2)位于剖面中下部的4个桩点高度显示了2-4h的周期性变化,进一步显示出台风影响期间短时高能侵蚀作用导致的剖面地形迅速调整,以及台风后潮汐周日变动对滩面地形的影响;(3)各桩点高频尺度的突变时间点反映出了台风暴潮增水作用和碎波带沙坝进退引起剖面的蚀积变化;(4)各桩点地形高度的低频变化显示出台风后海滩剖面朝向堆积和恢复的趋势.
利用2006年8月2日至16 日0606號檯風"派比安"和0609號彊熱帶風暴"寶霞"影響期間于粵東後江灣中部海灘前濱設置的地形剖麵6箇同定觀測樁點上連續318h的逐時高度觀測值,基于一維最優小波包變換方法.分析瞭極耑波況影響下前濱剖麵不同高度固定點的時間變化特徵,主要結果為:(1)位于剖麵遲流作用上部的樁點1、2時間變化過程以2-5d的週期為主,反映瞭檯風作用前後剖麵的波動過程;(2)位于剖麵中下部的4箇樁點高度顯示瞭2-4h的週期性變化,進一步顯示齣檯風影響期間短時高能侵蝕作用導緻的剖麵地形迅速調整,以及檯風後潮汐週日變動對灘麵地形的影響;(3)各樁點高頻呎度的突變時間點反映齣瞭檯風暴潮增水作用和碎波帶沙壩進退引起剖麵的蝕積變化;(4)各樁點地形高度的低頻變化顯示齣檯風後海灘剖麵朝嚮堆積和恢複的趨勢.
이용2006년8월2일지16 일0606호태풍"파비안"화0609호강열대풍폭"보하"영향기간우월동후강만중부해탄전빈설치적지형부면6개동정관측장점상련속318h적축시고도관측치,기우일유최우소파포변환방법.분석료겁단파황영향하전빈부면불동고도고정점적시간변화특정,주요결과위:(1)위우부면충류작용상부적장점1、2시간변화과정이2-5d적주기위주,반영료태풍작용전후부면적파동과정;(2)위우부면중하부적4개장점고도현시료2-4h적주기성변화,진일보현시출태풍영향기간단시고능침식작용도치적부면지형신속조정,이급태풍후조석주일변동대탄면지형적영향;(3)각장점고빈척도적돌변시간점반영출료태풍폭조증수작용화쇄파대사패진퇴인기부면적식적변화;(4)각장점지형고도적저빈변화현시출태풍후해탄부면조향퇴적화회복적추세.
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.