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Title: Scour protection for Dam No. 2, Arkansas River, Arkansas : hydraulic model investigation
Authors: United States. Army. Corps of Engineers. Little Rock District.
Hite, John E.
Keywords: Arkansas River
Dam No. 2, Arkansas
Hydraulic models
Navigation Dam
Scour protection
Hydraulic structures
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-93-7.
Description: Technical Report
Abstract: Tests were conducted on a 1:36-scale model of Dam No. 2, Arkansas River, to determine a method to prevent additional scour upstream and downstream from tbe structure and protect these areas from flow conditions resulting from gate misoperation, vandalism, debris passage, and navigation accidents. The model reproduced 600 ft of topography upstream from the dam, the entire spillway and stilling basin, the proposed scour protection material, and approximately a 1,200-ft length of the channel downstream from the stilling basin. A navigation accident in December of 1982 severely damaged the scour protection upstream and downstream from the dam. Initial model tests were conducted to determine the degree of scour protection provided by the riprap used to repair the damaged areas after the accident. Tests were then conducted to develop scour protection for flow conditions resulting from operations with a single gate fully open, the normal upper pool, elevation (el) 162 ft referred to the National Geodetic Vertical Datum, and the minimum anticipated tailwater, el 113. A secondary stilling basin that performed satisfactorily was developed for these flow conditions, but construction was not feasible. There was concern that the project could not be dewatered, and the method of scour protection determined from the model would have to be constructed underwater. A scour protection plan was developed for the flow conditions stated previously that consisted of sunken barges, grouted riprap (riprap with tremie concrete placed in the voids), and graded riprap. The barges were filled with grouted riprap and placed beginning 15 ft downstream from the end of the existing stilling basin and sloped downward on a 1V on 6H slope. The area between the end of the stilling basin and the barges was backfilled with riprap and grouted, and a horizontal blanket of graded riprap was placed downstream from the barges for a distance of 100 ft.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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