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|Title:||Goodrich Landing revetment, Mississippi River field investigation|
|Authors:||United States. Mississippi River Commission.|
U.S. Army Engineer Waterways Experiment Station.
|Publisher:||U.S. Army Engineer Waterways Experiment Station.|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Potamology investigations report ; no. 14-1.|
Introduction: Goodrich Landing, Louisiana, is located on the right bank of the Mississippi River about mile 460 ABP in a bendway of the river known as Alsatia-Salem Bend. Bank caving at Goodrich Landing has been active over a long period of time. A revetment was constructed in 1925 to retard the attack which was threatening the main-line levee. Subsequently, Willow Cutoff was made about 3 miles downstream from the revetment and a new main-line levee was constructed in 1934. The bank attack then shifted just upstream and downstream of the revetment and by 1940 had flanked both ends of the revetment. The subsequent attack was so severe as to cause destruction of the revetment. A new revetment was placed in 1944 and was extended both upstream and downstream in 1945. By 1950 additional upstream and downstream extensions were being contemplated, and the Vicksburg District conducted an extensive field investigation in this connection during the summer of 1950. The revetment extensions were constructed in 1951. The upstream portion of the revetment extends over the point bar deposits of Island 97, and the revetment extends downstream over point bar deposits of Dogtail Landing, which is in the vicinity of the Salem crevasse of 1912. Early investigations of soils conditions at Goodrich were conducted by the Vicksburg District in 1942, 1944, and 1945, in conjunction with the design of bank slopes which, as stated previously, were graded and revetted at various times during the years 1943-1945. Although the detailed results of these investigations are not presented here, they have been used to determine the general geologic conditions at the site. As also previously mentioned, the Vicksburg District also conducted a soils investigation downstream of the existing revetment in 1950 for the purpose of designing slopes for the revetment extension placed during 1951. The data pertaining to this investigation are presented herein. The Waterways Experiment Station made four cone penetrometer soundings at Goodrich in October 1951 as a part of the cone correlation study being conducted under the potamology program. It was planned originally that these soundings would be made adjacent to the borings drilled at the edge of the bank by the Vicksburg District in 1950. However, because of bank caving occurring between September 1950 and May 1951, the edge of the bank bad receded between 60 and 340 ft, and the soundings had to be made behind the line of borings. Inasmuch as it was thought the soil conditions landward of the borings might be slightly different, an undisturbed boring was made adjacent to the cone soundings. This report on the field investigations at Goodrich Landing presents a summary of the soil conditions at the site and predicts the stability (with respect to liquefaction failures) of the downstream portion of the bank revetted in 1951, Correlation of the cone penetrometer is to be presented at a later date in a separate report covering all sites in the potamology investigation.
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