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Lock Performance By Wesley W. Wilson University of Oregon and IWR.

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Presentation on theme: "Lock Performance By Wesley W. Wilson University of Oregon and IWR."— Presentation transcript:

1 Lock Performance By Wesley W. Wilson University of Oregon and IWR

2 Purpose of Study The inland waterway consists of the river and a series of locks and dams that allow the river to be navigated. The capacity and use of the waterway depends on lock performance. There is a wealth of information on locks and lock performance which can be used to estimate the effects of particular lock characteristics on performance. Purpose To develop and estimate a model of lock performance as a function of lock and flotilla characteristics.

3 Locks Locks: Necessary to make the river navigatable. River Lock River Pool 1 Pool 2

4 Flotillas and Lockages A flotilla consists of a power vessel and a set of barges which have different configurations and dimensions. Locks have a fixed set of dimensions. Single Lockage: Flotilla can pass through in one cut. Double Lockage: Flotilla must take two cuts to pass through the lock.

5 Single Lockage Approach the lock Enter the chamber Gates close Lock is filled (or emptied) Open gates Exit the lock.

6 Double Lockage Approach the lock Enter the chamber Uncouple and back out second cut (*) Close gates Fill (empty) the lock chamber Open gates First cut exits (*) Close gates (*) Fill (empty) the lock chamber (*) Open gates (*) Second cut enters lock chamber (*) Close gates (*) Fill (empty) the lock chamber (*) Open gates (*) Recouple the tow (*) Exit

7 Lock Characteristics Age Dimensions (length and width) Gate Types Number of chambers Lift

8 Upper Miss Locks Age 29 Locks Year opened ranges from 1922 – 1990

9 Lock Length

10 Lock Dimensions Standard Lock on UMISS is 110 by 600. _______________________________________________ Width Length56110Total Total32629

11 Lift LiftFreq.Percent Total

12 Flotilla Characteristics Flotilla is a tow-barge configuration that passes through a lock. In 2000, there were about 69,989 flotillas on the UMiss that were used in the analysis.

13 Flotilla Data Over 69,000 observations (flotillas are tow/barge passages through a lock) Characteristics: Number of barges per flotilla:

14 Flotilla Data Flotilla Lengths

15 Flotilla Width

16 Flotilla Draft

17 Characteristics Number of cuts 1-33,945 (48.5%) 2-36,043 (51.5%) Up and Down River Cuts 35,319 Down River 34,670 Up River Day versus Night 38,481 (55%) Day

18 Cuts and Month

19 Lockage Types TYPENumberPercent C - Consecutive 35, J - Jackknife 9 0 K -Knockout 6,231 9 S - Straight 26, T -Barge Transfer 68 0 V - Set over 1,224 2 Z -Other 3 0

20 Mechanical Assist Type Number Percent I - Tow with Bow Thrusters 70 0 J - Tow haulage (e.g., winch) (e.g., winch, kevel) K – Hydraulic N – Tow and Barge equip (e.g., winch, kevel) None

21 Processing Time (End of lockage-Start of Lockage-Stoppage) Mean77 minutes 50% 79 minutes

22 Lock Length and Processing Time

23 Lock Times-Size and Cuts LockMinutes AllSingle Multiple All

24 Econometric Model Time = f(Lock, Flotilla, Vessel, Passage, Time of day) Lock: Dummies for width and length Lift Age Flotilla: Length, width, number of barges Vessel:Horse power and dummy for tugboat or not. Passage:Dummies for single or double cuts Dummy for first in queue or not Time of day:Dummy for night or day. Unobserved factors: River conditions, lockmaster rules.

25 Results-Lock Types (R 2 =83) Lock (600 by 110 base) 1200 by by by log_lift log_age

26 Flotilla Effects log-length log_width log_area/NUMBAR

27 Vessel Effects v_hp v_length v_brea~h v_age v_draft tugboat

28 Passage Results mult daytime q_ upriver

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