Volume  51  (1999)  Number  4

471

Between  the  surface  and  about  20  m  depth  as
well  as  in  the  bottom  layer,  the  difference  in  the
mean  current  direction  is  only  a  few  degrees.  As  has
been  mentioned  above,  significant  differences  occur ­
  in  layers  5  and  6  because  the  model  cannot  resolve ­
  the  sharp  shear  due  to  its  layer  thickness.

Variances  and  co-variances,  as  well  as  the  mean
and  eddy  kinetic  energy  k M  and  k E \  also  are  of  a
comparable  order  of  magnitude.  Due  to  the  strong
tides  there  is  much  more  energy  in  the  current  fluctuations ­
  than  in  the  mean  currents  (see  k E lk M  in
Table  3).

layer
bin

depth
m

u
cm/s

V
cm/s

mag
cm/s

speed
cm/s

dir
0

k E  k M
(cm/s) 2

u’u’

vV
(cm/s) 2

uV

k E /k M

M

1

4.0

1.6

0.2

36.0

1.6

81

802.2

1.3

1471

133

-392

625

A

15

6.0

2.4

0.4

36.8

2.4

80

832.6

2.9

1558

105

-267

289

M

2

10.0

1.2

0.5

34.7

1.3

68

727.7

0.8

1277

177

-405

897

A

13

10.0

1.8

0.5

36.2

1.9

75

806.1

1.7

1468

144

-380

465

M

3

14.0

0.9

0.4

34.3

0.9

65

698.2

0.5

1192

205

-396

1565

A

11

14.0

1.4

0.5

34.8

1.5

70

735.5

1.2

1289

182

-405

627

M

4

18.0

0.6

0.3

34.0

0.6

63

677.4

0.2

1136

218

-380

3272

A

9

18.0

0.6

0.3

33.6

0.7

63

673.7

0.2

1136

209

-386

2716

M

5

22.0

0.3

0.1

33.4

0.3

70

645.1

0.0

1071

219

-348

11130

A

7

22.0

-0.1

-0.1

32.7

0.2

219

622.9

0.0

1014

229

-352

54705

M

6

27.0

0.0

-0.2

32.1

0.2

168

586.2

0.0

958

214

-291

27418

A

5

26.0

-0.5

-0.7

31.7

0.9

212

572.5

0.4

907

238

-304

1543

M

7

34.0

-0.2

-0.8

28.7

0.8

193

453.0

0.3

720

186

-194

1360

A

1

34.0

-0.3

-1.4

27.4

1.4

191

414.4

1.0

639

190

-181

398

Table  3:  Current  statistics  model  (M)  and  ADCP  (A)  data

layer

bin

depth
m

r

%

delta
cm/s

1

15

5

zonal

0.95

91

0.7  ±  12.1

merid.

0.67

45

0.2  ±  8.9

2

13

10

zonal

0.96

91

0.5  ±11.2

merid.

0.87

76

0.1  ±  6.5

3

11

14

zonal

0.95

90

0.5  ±11.3

merid.

0.93

86

0.2  ±  5.3

4

9

18

zonal

0.95

90

0.0  ±  10.9

merid.

0.94

88

0.1  ±  5.1

5

7

22

zonal

0.95

90

-0.5  ±  10.3

merid.

0.94

88

-0.1  ±  5.3

6

5

27

zonal

0.95

91

-0.5  ±  9.5

merid.

0.94

88

-0.4  ±  5.3

7

1

34

zonal

0.95

90

-0.1  ±  8.5

merid.

0.93

86

-0.5  ±  5.2

r  =  correlation  coefficient

delta  =  mean  (V
k..  -  -ra 2  +  v\  -

1  YmodelLi  Std.
-ru’u’+  v’v’1.  Wll

deviation
lll'=  U  -  n—