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318 A soil activity ASSET Adjustable Shear Stress Erosion and Transport BBET bottom borehole erosion test BET borehole erosion test Ca/Na calcium/sodium ratio Cc coefficient of curvature CDC Centers for Disease Control and Prevention CEC cation exchange capacity CFD computational fluid dynamics CL clay of low plasticity CV coefficient of variation C.V. cross-validation Cu coefficient of uniformity D50 mean particle size EC erosion category ECDF empirical cumulative density function EFA erosion function apparatus ER electrical resistivity ERT electrical resistivity tomography ESTD ex situ scour testing device Ev initial slope of velocityâerosion rate Et initial slope of shear stressâerosion rate GEER Geotechnical Extreme Events Reconnaissance gpm gallons per minute HEC Hydraulic Engineering Circular HET hole erosion test ISEEP in situ erosion evaluation probe ISTD in situ scour testing device JET jet erosion test LBET lateral borehole erosion test LL liquid limit LVDT linear variable differential transformer MCMC Markov Chain Monte Carlo Mg magnesium ML silt MSE mean square error na not applicable NA not available Symbols and Abbreviations
Symbols and Abbreviations 319 NSF National Science Foundation PC percent clay PDF probability density function PET pocket erodometer test PF percentage finer than Sieve #200 PI plasticity index PL plastic limit POO probability of overpredicting POU probability of underpredicting PP pocket penetrometer strength RELLIS Respect, Excellence, Leadership, Loyalty, Integrity, and Selfless RETA rotating erosion testing apparatus RH roughness height SEDFlume High Sheer Stress flume SERF Sediment Erosion Rate Flume SET slot erosion test STAR-CCM+ Star Computational Continuum Mechanics Su undrained shear strength TAMU Texas A&M University TTPTA true triaxial piping test apparatus USACE U.S. Army Corps of Engineers USBR U.S. Bureau of Reclamation USCS Unified Soil Classification System USGS U.S. Geological Survey VST vane shear strength vc critical velocity WC water content γ wet unit weight tc critical shear stress