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Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management
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Intercomparing varied erosion, deposition and transport process representations for simulating sediment yield.

Tan Zi1, Mukesh Kumar2, John Albertson3

  • 1Tetra Tech Inc, Integrated Water Management, Fairfax, 22030, USA.

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|August 21, 2019
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Summary
This summary is machine-generated.

Different sediment process representations significantly impact watershed suspended sediment yield estimates. This study evaluates six configurations to understand their influence and limitations for users.

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Area of Science:

  • Earth and Environmental Sciences
  • Hydrology
  • Sedimentology

Background:

  • Numerous sediment models exist, employing diverse representations for erosion, deposition, and transport.
  • Previous model intercomparison studies often focused on performance rather than the impact of specific process representations.

Purpose of the Study:

  • To evaluate the influence of different sediment process representations on suspended sediment yield estimates from a watershed.
  • To compare the fidelity of simpler sediment models against a physically-based model with coupled surface-subsurface hydrologic interactions.

Main Methods:

  • Considered six model configurations representing various permutations of erosion, deposition, and transport process representations.
  • Designed numerical experiments to assess how well simpler models capture sediment dynamics simulated by a complex, physically-based model.

Main Results:

  • Demonstrated that the choice of process representations significantly affects suspended sediment yield estimates.
  • Highlighted the varying degrees to which simpler models replicate the sediment dynamics of more complex, physically-based models.

Conclusions:

  • Delineated the applicability and limitations of widely used sediment process representations.
  • Provides guidance for users to identify the advantages and disadvantages of sediment models at different temporal scales.