Mechanics of Sediment Transport

Chien, Ning; Wan, Zhaohui

doi:10.1061/9780784404003

Cited by 406 publications

(339 citation statements)

References 118 publications

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“…Parameterization of the erodibility coefficient (k) and fluid shear stress (s j i f ) follow the method of Hanson and Simon [2001]. The model estimates T c using a Bagnold like expression [Chien and Wan, 1999] as…”

Section: 1002/2015wr016999mentioning

confidence: 99%

Isotope‐based Fluvial Organic Carbon (ISOFLOC) Model: Model formulation, sensitivity, and evaluation

Ford

Fox

2015

Water Resources Research

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Watershed-scale carbon budgets remain poorly understood, in part due to inadequate simulation tools to assess in-stream carbon fate and transport. A new numerical model termed ISOtope-based FLuvial Organic Carbon (ISOFLOC) is formulated to simulate the fluvial organic carbon budget in watersheds where hydrologic, sediment transport, and biogeochemical processes are coupled to control benthic and transported carbon composition and flux. One ISOFLOC innovation is the formulation of new stable carbon isotope model subroutines that include isotope fractionation processes in order to estimate carbon isotope source, fate, and transport. A second innovation is the coupling of transfers between carbon pools, including algal particulate organic carbon, fine particulate and dissolved organic carbon, and particulate and dissolved inorganic carbon, to simulate the carbon cycle in a comprehensive manner beyond that of existing watershed water quality models. ISOFLOC was tested and verified in a low-gradient, agriculturally impacted stream. Results of a global sensitivity analysis suggested the isotope response variable had unique sensitivity to the coupled interaction between fluvial shear resistance of algal biomass and the concentration of dissolved inorganic carbon. Model calibration and validation suggested good agreement at event, seasonal, and annual timescales. Multiobjective uncertainty analysis suggested inclusion of the carbon stable isotope routine reduced uncertainty by 80% for algal particulate organic carbon flux estimates.

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Section: 1002/2015wr016999mentioning

confidence: 99%

Isotope‐based Fluvial Organic Carbon (ISOFLOC) Model: Model formulation, sensitivity, and evaluation

Ford

Fox

2015

Water Resources Research

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“…This index has been used by some Chinese workers to establish a semi-theoretical sediment Figure 1. Relation of flow strength index v 3 /gdω to saturated suspended-sediment concentration c (based on Wan and Shen (1978) and modified from Xu (1993)) 752 J. XU transport formula (Chien and Wan, 1983). It can be seen from Figure 1 that the flow strength required for carrying sediment is greatest at suspended concentrations of around 100-200 kg m 3 .…”

mentioning

confidence: 95%

“…They can be generalized as (1) larger unit weight and flow shear stress, (2) smaller submerged weight that leads to smaller suspension work and larger sediment-carrying capacity, and (3) strong erosivity and greatly enhanced sediment-carrying capacity. Many studies have been carried out in this field in China, through laboratory and field observations: for some detailed discussion see Chien and Wan (1983), Chien (1989), Wan and Shen (1978), Chien et al (1979), Long and Chien (1986) and Xu (1999), among many others.…”

Section: Complicated Behaviour Of Natural Sediment-carrying Streamflowsmentioning

confidence: 99%

“…The effect of this decline will exceed the effect of increase in S s m , so the suspension work starts to decline. Some workers think that the energy for doing suspended work comes from turbulent energy of the streamflow (Chien and Wan, 1983;Yang, 1996), so it has only a minor effect on the streamflow's effective potential energy expenditure. However, when suspended sediment concentration increases, the unit weight of liquid phase also increases, which markedly reduces the submerged weight of coarse sediment particles.…”

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confidence: 99%

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Complex behaviour of natural sediment‐carrying streamflows and the geomorphological implications

2002

Earth Surf Processes Landf

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Based on the data from alluvial rivers in China, the complex mechanical behaviour of sediment-carrying streamflow of natural rivers has been observed. Channel geometry also exhibits complex behaviour in response to variation in suspended concentration. With the increase in suspended concentration, channel width : depth ratio increases, reaches a maximum and then decreases. The inverse is true for channel sinuosity. When suspended concentration is low, a meandering pattern is dominant. The increase in suspended concentration leads to a transformation from a meandering to a braided pattern. But when the suspended concentration increases further and enters the range of hyperconcentrated flows, the meandering pattern appears. The complex behaviour of channel pattern change may be regarded as a reflection of the complex behaviour of sediment-carrying streamflows at the river reach scale.

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“…Sediment carrying flows in rivers, especially hyperconcentrated flows in the Yellow River and its tributaries, can be regarded as a two-phase flow (Chien and Wan, 1998;Zhao, 1996). Its behavior depends on the solid phase and the liquid phase; the latter is a quasi-homogeneous mixture of water and fine sediment.…”

Section: Introductionmentioning

confidence: 99%

The behavior of specific sediment yield in different grain size fractions in the tributaries of the middle Yellow River as influenced by eolian and fluvial processes

2007

Earth Surf Processes Landf

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Almost all these break points may be regarded as thresholds. These thresholds are all located in the areas dominated by the coupled wind-water process, indicating that these areas are sensitive for erosion and sediment production, to which more attention should be given for the purpose of erosion and sediment control. A number of regression equations were established, based which the effect of rainfall, sanddust storms and surface material grain size on specific sediment yield can be assessed.

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Mechanics of Sediment Transport

Cited by 406 publications

References 118 publications

Isotope‐based Fluvial Organic Carbon (ISOFLOC) Model: Model formulation, sensitivity, and evaluation

Isotope‐based Fluvial Organic Carbon (ISOFLOC) Model: Model formulation, sensitivity, and evaluation

Complex behaviour of natural sediment‐carrying streamflows and the geomorphological implications

The behavior of specific sediment yield in different grain size fractions in the tributaries of the middle Yellow River as influenced by eolian and fluvial processes

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