Parameter |
Remarks |
Unit |
Standard scenario |
Harbour |
Busy navigation route |
| Selected location |
|
|
Pleasure craft harbour of Jyllinge |
Kronprins Frederiks Bro near Frederikssund |
| pH |
|
|
7 |
7 |
Oxygen conditions
(water column) |
|
|
aerobic |
aerobic |
| Oxygen conditions (sediment) |
|
|
anoxic |
anoxic |
| Salinity |
From Harremoės and Malmgren-Hansen (1989) |
‰ |
14.5 |
14.5 |
| Temperature |
From Fredenslund et al. (1995) |
°C |
12.5 |
12.5 |
| Suspended matter |
From Fredenslund et al. (1995) |
mg/L |
18 |
18 |
| Organic carbon (OC) in suspended matter |
From Fredenslund et al. (1995) |
weight % |
8 |
8 |
| Organic carbon (OC) in sediment |
From Fredenslund et al. (1995) |
weight % |
5 |
5 |
| Water content in sediment |
From Fredenslund et al. (1995) |
weight % |
80 |
80 |
| Density of sediment |
From Fredenslund et al. (1995) |
kg/m3 |
1,200 |
1,200 |
| Water depth |
Information from Danish Sailing Association and from Ulrik
Petersen, bridgemaster at Kronprins Frederiks Bro (near Frederikssund). |
m |
2.3
The difference between high and low tides is stated to be approx. 1 m. Here, the daily
tidal variation is put at 0.6 m.
Min. depth at high wind: 1.4 m
Max. depth at high wind: 2.9 m |
4.2
Typical variation in 24 hours: 0.6 m
Min. depth at high wind: 3.5 m
Max. depth at high wind: 5.4 m |
Area considered |
Information from Danish Sailing Association. |
m2 |
Area of the pleasure craft harbour, approx. 31,500 |
2 · 1 m · width of the boats |
Net sedimentation |
From Bach et al. (1986) |
m sediment/ year |
0.01 |
0.01 |
Sedimentation rate |
From Fredenslund et al. (1995) |
m/d |
1.0 |
1.0 |
| Resuspension rate |
Calculated by putting net sedimentation velocity at 0.01
m/year |
m sediment/ year |
0.017 |
0.017 |
| Water exchange |
|
m3/m2/day |
0.6 |
0.6 |
| % of vessels with examined bottom paint |
Hempel (represented by M.W. Christoffersen) estimates that
30-70% of the boats in a harbour are painted with a bottom paint containing an organic
active substance. In order to ensure a realistic worst-case estimate, this percentage is
put at 70% |
% |
70 |
70 |
| Number of boats per day |
Based on information from Danish Sailing Association and
statistics on the passing-through of pleasure craft at Kronprins Frederiks Bro (near
Frederikssund) |
|
400 |
70 |
| Time that the centre of gravity of the boats stay in the
waters |
|
days |
always there |
7.5× 10-6 |