National Academies Press: OpenBook

Relationship Between Erodibility and Properties of Soils (2019)

Chapter: Symbols and Abbreviations

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Page 318
Suggested Citation:"Symbols and Abbreviations." National Academies of Sciences, Engineering, and Medicine. 2019. Relationship Between Erodibility and Properties of Soils. Washington, DC: The National Academies Press. doi: 10.17226/25470.
Page 318
Page 319
Suggested Citation:"Symbols and Abbreviations." National Academies of Sciences, Engineering, and Medicine. 2019. Relationship Between Erodibility and Properties of Soils. Washington, DC: The National Academies Press. doi: 10.17226/25470.
Page 319

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

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 velocity–erosion rate Et initial slope of shear stress–erosion 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

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Analysis of the erodibility of geomaterials is important for the study of problems related to soil erosion such as bridge scour, embankment overtopping erosion, and stream stability. Erodibility is the relationship between the soil erosion rate and fluid velocity or hydraulic shear stress. Since different soils have different geotechnical properties, their erosion rates vary.

The TRB National Cooperative Highway Research Program's NCHRP Research Report 915: Relationship Between Erodibility and Properties of Soils provides reliable and simple equations quantifying the erodibility of soils on the basis of soil properties.

The report presents a detailed analysis of the issue. In addition, the project that developed the report also produced a searchable spreadsheet that uses statistical techniques to relate geotechnical properties to soil erodibility. The spreadsheet, NCHRP Erosion, includes a searchable database that includes compiled erosion data from the literature review and a plethora of erosion tests. It contains equations that may be used to estimate the erosion resistance of soil and determine whether erosion tests are needed.

The following appendices to NCHRP Report 915 were published online in a single Appendices Report:

Appendix 1 – Erosion Test Results Spreadsheets

Appendix 2 – Geotechnical Properties Spreadsheets

Appendix 3 – First and Second Order Statistical Analysis Results

Appendix 4 – Deterministic Frequentist Regression Analysis

Appendix 5 – Probabilistic Calibration Results

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