Jökull - 01.12.1999, Blaðsíða 58

Table 2. Input data for Gígjukvísl cross profile 2. —Gildi sem notuð eru íþversniði 2.
West East
Sector A Sector B Sector C Sector D Total/Mean
Width (m) 225 250 400 380 1255 (Total)
Mean depth d (m) 4.8 4.5 3.6 4.8 4.36 (Mean)
Hydraulic radius 4.6 4.34 3.54 4.68 4.33 (Mean)
Roughness Ks (m) 1.512 5.0625 9.72 2.16
Proportion of flow depth occupied by resistance elements AA 0.07 0.25 0.6 0.1
Slope (mm"1) minimum 0.0029 0.0029 0.0029 0.0029
Slope (mm 1) maximum 0.0049 0.0049 0.0049 0.0049
Cross-sectional area (m7) 1080 1125 1440 1824 5472 (Total)
Wetted-perimeter (m) 236 259 407 390 1264
Table 3. Input data for Gígjukvísl cross profile 3. —Gildi sem notuð eru íþversniði 3.
West East
Sector A Sector B Sector C Sector D Total/Mean
Width (m) 150 300 425 540 1415 (Total)
Mean depth d (m) 6 6 6.25 5.5 5.88 (Mean)
Hydraulic radius 5.56 5.77 6.06 5.35 5.83 (Mean)
Roughness Ks (m) 1.35 6.75 15.47 2.48
Proportion of flow depth occupied by resistance elements AA 0.05 0.25 0.55 0.1
Slope (mm 1) minimum 0.0029 0.0029 0.0029 0.0029
Slope (mm 1) maximum 0.0049 0.0049 0.0049 0.0049
Cross-sectional area (m2) 902 1800 2656 2970 8320 (Total)
Wetted-perimeter (m) 162 312 438 555 1427
Table 4. Calculated roughness values and associated discharge figures. — Reiknuð gildi hrjúfleika og viðeigandi streymi.
/ Eqv. n Velocity Velocity Froude No. Froude No. Discharge Discharge
value minimum maximum minimum maximum minimum maximum
(Richards, (ms 1) (ms 1) (mas 1) (mas-i)
1982) (Total) (Total)
Cross-section 1
Sector A 0.09 0.046 3.6 5.2 0.45 0.65 3009 4393
Sector B 0.09 0.050 4.6 6.7 0.45 0.66 14368 20972
Sector C 0.1 0.049 4.0 5.9 0.43 0.62 2348 3427
(19725) (28791)
Cross-section 2
Sector A 0.11 0.048 2.8 4.1 0.41 0.60 3038 4434
Sector B 0.31 0.080 1.6 2.4 0.24 0.35 1813 2647
Sector C 1.16 0.150 0.7 1.1 0.13 0.18 1079 1575
Sector D 0.14 0.054 2.5 3.7 0.37 0.53 4583 6689
(10513) (15345)
Cross-section 1
Sector A 0.09 0.045 3.4 5.0 0.45 0.65 3103 4529
Sector B 0.31 0.084 1.9 2.7 0.24 0.35 3345 4882
Sector C 1 0.152 1.1 1.6 0.14 0.20 2825 4123
Sector D 0.14 0.055 2.7 3.9 0.37 0.53 7981 11650
(17254) (25183)
15831 23106
56 JÖKULL, No. 47