Balanced Cross‐Sections and Numerical Modeling of the Lithospheric‐Scale Evolution of the Hindu Kush and Pamir

2021 ◽  
Vol 126 (3) ◽  
Author(s):  
Sean Kelly ◽  
Christopher Beaumont
Keyword(s):  
Numerical Modeling ◽  
Cross Sections ◽  
Hindu Kush ◽  
Scale Evolution

scholarly journals Prognozowanie zmian korytotwórczych w uregulowanym korycie rzeki Czarny Dunajec z wykorzystaniem modelu jednowymiarowego

2017 ◽  
Vol 26 (3) ◽  
pp. 346-360
Author(s):  
Karol Plesiński ◽  
Paweł Michalik ◽  
Artur Radecki-Pawlik
Keyword(s):  
Numerical Modeling ◽  
Cross Sections ◽  
Field Measurements ◽  
Mountain River ◽  
River Engineering ◽  
Block Ramp

Along the paper, we presented an analysis of changes of cross-sections morphology within the regulated reach of a mountain river. The river engineering works there were done by building cable block ramp. The studied reach was located in the Czarny Dunajec river. Analyzed reach of the river consisted of 100-m long segment upstream of the existing block ramp and 65 m downstream of it. The analysis was done based on field measurements, numerical modeling with HEC-RAS and Hjulström’s graph. Numerical modeling was conducted for observed flood Qfl ood = 16.9 m3·s–1 on 5 August 2013, and for the t-years floods: Q50% = 59 m3·s–1, Q25% = 99 m3·s–1, Q10% = 165 m3·s–1 and Q1% = 321 m3·s–1. For the analyzed reach an attempt was done to determinate dominant discharge.

Numerical Modeling of Soil-Pipeline Interaction Mechanism Caused by Surface Subsidence due to Longwall Mining

2013 ◽  
Vol 838-841 ◽  
pp. 2202-2207
Author(s):  
Guo Ming Cheng ◽  
Wen Jie Xu ◽  
Hong Bin Chu
Keyword(s):  
Numerical Modeling ◽  
Cross Sections ◽  
Longwall Mining ◽  
Measurement Data ◽  
Interaction Mechanism ◽  
Surface Subsidence ◽  
Face Advance ◽  
Subsidence Basin ◽  
The Face

In China, Surface subsidence caused by underground coal mining has affected the safe operation of pipelines in recent years. Take the coal mine in Shanxi section of the west-east gas pipeline as case study, numerical modeling was adopted to study the interaction mechanism of the soil-pipeline caused by longwall mining, and the numerical model was calibrated with the measurement data. The results reveal that the soil-pipeline interaction undergoes an evolution process from synchronization to separation during the subsidence process. The peak stresses on the pipeline at cross-sections occur generally above the centre of the corresponding subsidence basins at different stages of face advance, and the maximum stress on the pipeline appeared at about 150m above the centre of the subsidence basin as the face advances 300m.

scholarly journals Numerical modeling of circular, square and rectangular concrete columns wrapped with FRP under concentric and eccentric load

2019 ◽  
Vol 12 (3) ◽  
pp. 518-550
Author(s):  
D. S. OLIVEIRA ◽  
R. CARRAZEDO
Keyword(s):  
Numerical Modeling ◽  
Cross Sections ◽  
Axial Strain ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Transverse Strain ◽  
The Finite Element Method ◽  
Eccentric Load ◽  
Compressive Stresses ◽  
Rectangular Columns

Abstract In this paper, the finite element method was used for the numerical modeling of columns with square, rectangular and circular cross sections wrapped with FRP. The numerical modeling was successfully calibrated with the experimental data considering axial load, axial strain and transverse strain. The distribution of compressive stresses in the cross section of the column indicates that for centered load, circular cross sections have uniform distribution and for square and rectangular sections the effective confined concrete was defined by parabolas and concentrates next to the rounded corners. For eccentric load, the effective confined region moves to the most confined edge, thus, this does not reduce the gain for square and rectangular columns, but is unfavorable for circular columns.

scholarly journals Supplemental Material: Active faulting controls bedform development on a deep-water fan

2021 ◽  
Author(s):  
Vittorio Maselli ◽  
et al.
Keyword(s):  
Numerical Modeling ◽  
Cross Sections ◽  
Deep Water ◽  
Active Faulting ◽  
Additional Information ◽  
Sediment Waves ◽  
Salt Deposits

Additional information about the numerical modeling, bathymetric profiles, cross sections along type 1 and type 2 bedforms, a 3-D view of the study area, seafloor bathymetry and thickness map of post-salt deposits, and morphology of sediment waves seaward of the fan.<br>

scholarly journals Supplemental Material: Active faulting controls bedform development on a deep-water fan

2021 ◽  
Author(s):  
Vittorio Maselli ◽  
et al.
Keyword(s):  
Numerical Modeling ◽  
Cross Sections ◽  
Deep Water ◽  
Active Faulting ◽  
Additional Information ◽  
Sediment Waves ◽  
Salt Deposits

Additional information about the numerical modeling, bathymetric profiles, cross sections along type 1 and type 2 bedforms, a 3-D view of the study area, seafloor bathymetry and thickness map of post-salt deposits, and morphology of sediment waves seaward of the fan.<br>

Fish Ladder Numerical Modelling

2018 ◽  
Vol 69 (3) ◽  
pp. 591-596
Author(s):  
Albert Titus Constantin ◽  
Marie Alice Ghitescu ◽  
Gheorghe I. Lazar ◽  
Serban Vlad Nicoara
Keyword(s):  
Numerical Modeling ◽  
Water Flow ◽  
Cross Sections ◽  
Water Velocity ◽  
Water Levels ◽  
Velocity Spectrum ◽  
White River ◽  
Fish Ladder ◽  
Maximum Value ◽  
Low Head

The paper presents a 1D numerical modeling of the sanitary water flow passing through a fish ladder designed for the low head step built across the Alb (White) River near Coroiesti Vilage in Hunedoara County. The model aims to evaluate the water velocity spectrum, emphasizing the maximum values, in the cross sections along this passing structure and in the same time to establish the water levels development. In order to reach this goal, the numerical model will consider a sinthetical hydrograph based on the maximum value of the sanitary water flow required on the river.

scholarly journals A Combined Field and Numerical Modeling Study to Assess the Longitudinal Channel Slope Evolution in a Mixed Alluvial and Soft Bedrock Stream

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 735 ◽  
Author(s):  
Wu ◽  
Yeh ◽  
Lai
Keyword(s):  
Numerical Modeling ◽  
Cross Sections ◽  
Large Scale ◽  
Spatial Scales ◽  
Scale Analysis ◽  
Entire Study ◽  
Study Approach ◽  
Study Results ◽  
Channel Slope ◽  
Longitudinal Channel

A study approach is developed to assess the longitudinal channel slope under the equilibrium condition as well as the transient evolution of a mixed alluvial-soft-bedrock stream. Both the historical field data and 2D mobile-bed numerical modeling are adopted. The proposed approach is applied to a 14 km reach downstream of the Ji-Ji Weir, Chuo-Shui River, Taiwan, where continuous maintenance works have been carried out to stabilize this reach. In this study, the temporal evolution of the longitudinal channel profile is assessed numerically with three spatial scales: The large (the entire study reach), the medium (four sub-reaches), and the local (cross-sections) scale. The large scale analysis is the approach for purely alluvial streams and is shown to be difficult to use to characterize mixed alluvial-bedrock streams. The local scale analysis shows that the soft-bedrock incision has a widely fluctuating slope, reflecting the compound environmental forcing and complex riverbed setting. With the medium scale analysis, the longitudinal channel profile is found to follow a predictive trend if the reach is partitioned into four distinctive sub-reaches. Characteristics of the dynamic channel slope evolution in different spatial scales are computed and presented. The study results can be used to select the proper locations and types of the engineering stabilizing structures in a mixed alluvial and soft bedrock stream

Analysis of STEM micrographs of thick objects

1978 ◽  
Vol 36 (2) ◽  
pp. 106-107
Author(s):  
S. Golladay
Keyword(s):  
Inelastic Scattering ◽  
Multiple Scattering ◽  
Mass Distribution ◽  
Cross Sections ◽  
Phase Contrast ◽  
Image Point ◽  
Contrast Effects ◽  
Total Cross Sections ◽  
Elastic And Inelastic Scattering

The theory of multiple scattering has been worked out by Groves and comparisons have been made between predicted and observed signals for thick specimens observed in a STEM under conditions where phase contrast effects are unimportant. Independent measurements of the collection efficiencies of the two STEM detectors, calculations of the ratio σe/σi = R, where σe, σi are the total cross sections for elastic and inelastic scattering respectively, and a model of the unknown mass distribution are needed for these comparisons. In this paper an extension of this work will be described which allows the determination of the required efficiencies, R, and the unknown mass distribution from the data without additional measurements or models. Essential to the analysis is the fact that in a STEM two or more signal measurements can be made simultaneously at each image point.

Direct Observation of Heat Exchanger Deposits by Cross Sectioning

1967 ◽  
Vol 25 ◽  
pp. 364-365
Author(s):  
R. W. Anderson ◽  
D. L. Senecal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Heat Exchanger ◽  
Direct Observation ◽  
Cross Sections ◽  
Preparation Method ◽  
Specimen Preparation ◽  
Flowing Water ◽  
Transmission Electron ◽  
Deposit Layer

A problem was presented to observe the packing densities of deposits of sub-micron corrosion product particles. The deposits were 5-100 mils thick and had formed on the inside surfaces of 3/8 inch diameter Zircaloy-2 heat exchanger tubes. The particles were iron oxides deposited from flowing water and consequently were only weakly bonded. Particular care was required during handling to preserve the original formations of the deposits. The specimen preparation method described below allowed direct observation of cross sections of the deposit layers by transmission electron microscopy.The specimens were short sections of the tubes (about 3 inches long) that were carefully cut from the systems. The insides of the tube sections were first coated with a thin layer of a fluid epoxy resin by dipping. This coating served to impregnate the deposit layer as well as to protect the layer if subsequent handling were required.

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