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Title: Lock approach canal surge and tow squat at Lock and Dam 17, Arkansas River Project : mathematical model investigation
Authors: United States. Army. Corps of Engineers. Tulsa District
Huval, C. J.
Keywords: Arkansas River
Mathematical models
Navigation channels
Lock filling and emptying systems
Squat of vessels
Numerical models
Navigation canal
Inland navigation
Publisher: Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-80-17.
Description: Technical Report
Abstract: The upstream approach canal to Choteau Lock is 150 ft (bottom) wide and has a nominal depth of 9 ft. Navigation tows with 8- to 8-1/2-ft draft have encountered navigation problems in the canal. These problems include several incidents of grounding on the canal bottom while under way. The lock filling surge is also considered a problem. This investigation was initiated to help the Tulsa District determine the most effective means of resolving navigation problems. An unsteady flow mathematical model was used to compute lock filling surges in the canal for the present and a variety of canal geometries. Squat effects in the canal were computed for several canal depths and widths, using a simplified model developed for steady and transient squat effects. Results showed that canal widening provides greater surge reduction than canal deepening for a given increase in cross- sectional area. Steady squat model computations indicate that a 12- ft depth is the minimum necessary to eliminate grounding. Transient squat computations at canal transitions (called supersquat effects) showed that a 200- ft-wide (bottom width) canal with a minimum 13-ft depth below el 511 would reduce grounding problems with minimum excavation costs. A 12- ft- deep by 300-ft-wide canal (i .e. without transitions) was recommended if economically justifiable. This canal size would allow increased tow speeds in the canal, eliminate supersquat altogether, and improve canal navigation conditions.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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