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|Title:||Bank distress of low water weirs on Big Creek, La.|
|Authors:||United States. Army. Corps of Engineers. Vicksburg District.|
Miller, Samuel P.
|Publisher:||Soils and Pavements Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: Several recently constructed low water weirs on Big Creek in northeastern Louisiana have shown signs of bank distress (slumping of slopes and severe erosion). The weirs were evaluated to determine possible causes of the distress, recommend remedial measures, and recommend direction for future studies. The evaluation included visual inspection, discussions with design and inspection personnel, soil sampling and testing, and soil and pore water chemistry determinations. The distress problem was divided into two parts: (A.) an erosion problem (gradual removal of material beneath and adjacent to the downstream edge of the slope protection) and (B.) a bank distress problem (i.e., riprap and filter fabric displacement associated with apparent large soil displacements). Erosion is a result of soil characteristics and the geometry of the downstream edge of the weir slope protection. Several causes of the bank distress were considered: (A.) overbank, downslope erosion beneath the filter fabric, (B.) stream current erosion of material from beneath the filter fabric and riprap, (C.) unstable channel slopes (shear failure), (D.) conditions during construction, and (E.) flow slides. Flow slides were considered the most probable explanation for the bank distress, though more detailed information on construction conditions and slope stability analyses could change this conclusion. Recommendations are given for short-term remedial work, future weir design, and further studies to better define the causes of bank distress.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Miscellaneous Paper|
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