(2) Supplying further analyses on the grain-size distribution; (3) Analyzing the similarities and differences between the three types of distributions under different connotations and figuring out the conversion formula of them; (4) Describing the efforts on the grain-size distribution between ...
The grain-size analysis of modern and ancient sediments and the treatment of data by Folk's formula give the following parameters: the standard deviation (δ1), mean size (Mz), kurtosis (Kg), skewness (SK1), simple skewness measure (αs) and simple sorting measure (Sos). Using these gr...
The grain-size components and their function types can be determined from frequency and cumulative curve plots in order to define the function formula of the grain-size distribution. The function parameters can be estimated by fitting a defined function formula to the measured grain-size data of ...
Hydraulic conductivity (K) is a crucial parameter in hydrogeology but is highly heterogeneous and anisotropic due to variations in sediment texture, making its large-scale estimation challenging. Traditional laboratory and empirical methods based on grain-size distribution (GSD) analysis from limited data...
4.1.7 Grain size Scanning electron microscopy is a technique with which the structure and size of the grains are estimated. The grain size determined using SEM analysis is always greater than crystallite size determined using Debye-Scherrer’s formula in XRD analysis. This difference arises due to...
DIN 66144 粒度分布图形表示法.对数正态网格 Graphical representation of particle size distributions; log-normal grid DIN 66145 粒度分布图形表示法.RRSB网格 Graphical representation of particle size distributions; RRSB-grid DIN 66161 粒度分析.公式符号、单位 Particle size analysis; formula symbols, units ...
On the other hand, if the grain size distribution becomes bimodal with coarse-grained inclusions in a nanosized matrix, the fracture toughness can be increased noticeably (Förster, Vassen, & Stöver, 1995). The technique was further improved by annealing the shaped bodies in vacuum before ...
(Hazen, Kozeny-Carman, Breyer, Slitcher, Terzaghi, USBR and Alyamani & Sen), the Slitcher formula predicted Ks, saturated hydraulic conductivity, better than other formulae with 0.671 R; 6.08 RMSE; 5.06 MAE; 20.75% RE & 1.393 DT and the Breyer formula estimated Ks, with largest ...
An assessment of bedload sediment transport formulae for gravel bed rivers. Water Resour. Res. 25, 1161–1186 (1989). Article ADS Google Scholar Parker, G., Klingeman, P. C. & McLean, D. G. Bedload and size distribution in paved gravel-bed streams. J. Hydraulics Div. ASCE 108, ...
size distribution (Kg), which were determined from eight empirical grain-size methods to represent streambed Kv. In this study, the values of Kvfor a streambed were derived using falling-head standpipe permeameter tests conducted at eight study sites in the Elkhorn River, Nebraska, and ...