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Page Title:
Table 4. Cross-Channel Maneuvering Capabilities |
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 Table 4
Cross-Channel Maneuvering Capabilities
Linear
Transit
Raise
From
To
Move Time Speed
Distance
Dustpan
Date
Start Time Stop Time Easting
min
Northing
Easting
Northing
ft
ft/min
min
6/6/2002
1620:08
1635:01
3943808
247532.4
3944079
248039.9
575
14.88
39
6/9/2002
1534:02
1541:03
3944041
243941.3
3943686
243956.1
355
7.01
51
6/9/2002
1603:47
1608:18
3943699
243986.9
3944018
243879
337
4.57
74
0.5
6/10/2002
908:44
915:05
3944062
243990.7
3943769
244044.3
298
5.35
56
6/10/2002
940:30
944:51
3943812
244062.8
3944062
243915.5
291
4.35
67
6/10/2002 1024:09
1032:51
3943760
244015.6
3944078
243921.4
332
8.70
38
6/10/2002 1111:39
1122:01
3944064
243914.3
3943701
244092.8
404
10.36
39
1.5
6/10/2002 1128:02
1133:33
3943770
244045.1
3944063
243910.8
322
5.51
58
6/10/2002 1657:30
1702:21
3944425
244310.2
3943949
244002
567
4.85
117
0.5
6/10/2002 1722:04
1724:55
3943931
244129.5
3943789
244179.6
15
2.84
53
0.83
6/10/2002 1726:05
1728:46
3943819
244146.1
3943932
244120.4
116
2.68
43
6/10/2002 1734:37
1738:27
3943927
244155.6
3943696
244172.8
232
3.83
61
0.83
6/11/2002 1547:50
1551:30
3944180
243723.6
3943921
243646.3
271
3.66
74
0.66
6/12/2002 1518:33
1521:44
3944253
243855
3943934
243610.8
402
2.80
143
0.83
Average lateral move velocity
65 ft/min
does not include the additional time required to pull the dustpan out of sediment
to allow the dredge to move without damaging the ladder. The dustpan "pull out"
times were calculated from the time-series data. When dredging in thinner faces,
the dustpan could be pulled up to a depth where the dredge could start moving in
approximately 0.5 min, whereas when dredging in the thicker faces (greater than
10 ft), it required approximately 1.5 min or more to clear the material. With a
minimum transit speed of 38 ft/min and maximum of 143 ft/min, the average
lateral transit speed for all 14 moves was 65 ft/min. The time variations were
primarily a function of total distance traveled by the dredge, and the ease (or
difficulty) of correctly positioning the floating hose. The fastest speeds occurred
on 10 and 12 June (117 and 143 ft/min, respectively), which was later in the
demonstration after experience had been gained in executing this maneuver and
when the dredge was moved from one extreme side of the CL to the other. Given
the channel width of 750 ft, at the average speed (65 ft/min) it would take
11.5 min for the dredge to cross from toe to toe. Using the two maximum rates of
lateral speed logged (117 ft/min and 143 ft/min), the Beachbuilder could com-
pletely cross the channel as quickly as 6.4 min and 5.2 min, respectively.
Results of Associated Branch Pilot survey regarding dustpan use
in navigation channel
Ten pilots responded to the survey sent to the Associated Branch Pilots of
New Orleans. Of these ten, two had only heard about the demonstration and
offered no opinion on the demonstration. Another one had heard about the
demonstration and piloted a vessel past the Beachbuilder as it operated and
30
Chapter 4
Dredging Operational Characteristics Analyses
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