# Tidal Current - Introduction

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Tidal Current - Introduction. Chang Hsien Kuo. 102 3 21 . Equipment: ADCP. ADCP: Acoustic Doppler Current Profilers Multi-layers (Three or ten Layers). Data Acquisition. Velocity : knot(0.51m/s) Azimuth: the current flows to that direction - PowerPoint PPT Presentation

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Tidal Current - IntroductionChang Hsien Kuo

102321

2.5343Velocity : knot(0.51m/s) Azimuth: the current flows to that direction wind or wave comes from that directionData Acquisition

3.53434

1011123

NRCEST45Data analysis methods in physical oceangraphy: Emery and Thomson (1998) p.325-327 (scatter plot):

5.5346

6.5347

7.534

8Wiegel (2005) :(wind driven current)(wave induced current)(tidal current)(ocean current)

(scatter plot):(covariance matrix)(Freeland et al., 1975; Preisendorfer , 1988)

20098.534

920099.53410(centroid of scatter plot)(minimum inertia moment about main axes)(maximum probability density of directional distribution)10.53411

(cluster analysis): Kmeans

1200911.534121/3

12.53413

13.53414

---Ksdensity

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8 15.53416612336423165224562425923958234552415623957236582385723961239345273581896718362433821038211152433222838223412213422639219:2-3180 :405018016.534Harmonic Analysis for tidal current17Vector (two-dimensional variables)E&N or (L&N) componentsHarmonic Analysis for Ui and Vi

Rotary component spectra 18Emery and Thomson (1998) p.427-431)

Rotary component spectra 19

Rotary component spectra 20

Rotary component spectra 21

Rotary component spectra 22

Rotary component spectra Major axis

Minor axis

Tilting angle

Flatness

23

EvaluationRMSE

R2(determination of coefficient)

24

Main components of tides and tidal current 25

Taipei Harbor

Main compinents of tides and tidal current 26 KaoHsiung Harbor

Astronomical tides27

Numerically simulated tides for Taipei and Anping harbor

U-component of tidal current 28

V-component of tidal current 29

Main components of tides and tidal current 30 St.T&C12345678910TPTideM2K1O1S2N2P1K2Q1Ssa2Cur.M2S2N2K1K2SaM4MsfO12TCTideM2S2N2K1O1K2SaL222Cur.SaSsaM2K1MmMsfO1S2MfP1APTideM2K1O1S2P1N2Q1SsaK2SaCur.M2S2SaK1N2S1O11SsaK2KHTideK1M2O1SaS2SsaP1N2Q1K2Cur.K1M2O1S2SaP11N2S1SsaHLTideM2S2SaK1O1N2K2P1SsaQ1Cur.M2S1SaK1S2M4Ms4K22O1SATideM2K1O1S2SaN2P1K2Q12Cur.M2SaS2K1O1S1K2M4MsfN2KLTideM2K1O1SaP1N2S2Q12K2Cur.M2S2N2Sa2M4SsaOp2L2Mks230Main components of tides31

Main components of tides and tidal current 32

Main components of tides and tidal current 33

Main components of tides and tidal current 34

Main components of tides and tidal current 35

Main components of tidal current 36

Main components of tidal current 37

Main components of tidal current 38