Browsing by Subject "Hydraulic engineering -- Instruments -- Testing."
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Item Modeling channel erosion in cohesive streams of the Blackland Prairie, Texas at the watershed scale.(2008-10-02T18:43:42Z) Capello, Stephanie V.; Allen, Peter M., 1947-; Geology.; Baylor University. Dept. of Geology.Stream bank erosion is a product of submerged and subaerial processes. The goal of this research was to assess the application of the submerged jet test to predict erosion of cohesive stream banks in the Blackland Prairie of North Central Texas, an area with over 40% of the State’s population. In situ erosion monitoring was conducted by utilizing erosion pins and water level loggers at seven field sites with contributing drainage areas of 5-239 square kilometers. Erosion pins were placed at two locations on the cutbank wall and monitored over one year. Erosion rates during the monitoring period were a function of bank height and flow duration. Submerged jet test values from samples taken at the same locations as the erosion pins predicted erodibility of the material ranged from 0.0034-0.0065 cm3/N-s. Erosion pins indicated 30.35-572.00 mm of loss. The predicted erosion coefficients from the jet test, tractive force, and cumulative flow duration was within 31% of the field erosion. This study evaluates the first in situ testing of the erodibility of cohesive stream banks with cumulative flow duration, cumulative tractive force, and subaerial processes.Item Streambank erosion assessment in non-cohesive channels using erosion pins and submerged jet testing, Dallas/Fort Worth, Texas.(2009-06-02T17:54:24Z) Coffman, David K.; Allen, Peter M., 1947-; Geology.; Baylor University. Dept. of Geology.The objective of this research was to determine if a submerged jet test could be used to predict the erodibility of non-cohesive streambank materials. The study area was the Dallas-Fort Worth Metroplex located within the Blackland Prairie, Texas. Streambank erosion rates were monitored for an eight month period in a 90 sq. km. watershed using erosion pins and water level data loggers. Five study sites, with drainage areas ranging from 3-41 sq. km, were monitored, and submerged jet tests were performed on six samples of original, undisturbed bank material. Field monitoring produced cumulative erosion losses of 27-150 mm over the study period. Submerged jet test erodibility coefficient values ranged from 0.0019-0.0345 cm/hr/Pa for field saturated and field dried samples. The submerged jet test results, adjusted for flow duration and associated applied shear stress, were within 38-47 percent of the field erosion. This corresponds to an overall error of plus or minus one centimeter over an eight month period. This study is the first to compare submerged jet test results to monitored field erosion rates in non-cohesive streambank materials.