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Title: Benchmarking an unstructured grid sediment model in an energetic estuary

A sediment model coupled to the hydrodynamic model SELFE is validated against a benchmark combining a set of idealized tests and an application to a field-data rich energetic estuary. After sensitivity studies, model results for the idealized tests largely agree with previously reported results from other models in addition to analytical, semi-analytical, or laboratory results. Results of suspended sediment in an open channel test with fixed bottom are sensitive to turbulence closure and treatment for hydrodynamic bottom boundary. Results for the migration of a trench are very sensitive to critical stress and erosion rate, but largely insensitive to turbulence closure. The model is able to qualitatively represent sediment dynamics associated with estuarine turbidity maxima in an idealized estuary. Applied to the Columbia River estuary, the model qualitatively captures sediment dynamics observed by fixed stations and shipborne profiles. Representation of the vertical structure of suspended sediment degrades when stratification is underpredicted. Across all tests, skill metrics of suspended sediments lag those of hydrodynamics even when qualitatively representing dynamics. The benchmark is fully documented in an openly available repository to encourage unambiguous comparisons against other models.
Authors:
 [1] ;  [1]
  1. Oregon Health & Science Univ., Portland, OR (United States). NSF Science and Technology Center for Coastal Margin Observation & Prediction
Publication Date:
Grant/Contract Number:
FG02-97ER25308; AC02-05CH11231; OCE-0424602; ACI-1053575; NA11NOS0120036; 00062251; AB-133F-12-SE-2046; W9127N-12-2-007; G13PX01212
Type:
Published Article
Journal Name:
Ocean Modelling
Additional Journal Information:
Journal Volume: 110; Journal ID: ISSN 1463-5003
Publisher:
Elsevier
Research Org:
Oregon Health & Science Univ., Portland, OR (United States)
Sponsoring Org:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21); National Science Foundation (NSF); National Oceanic and Atmospheric Administration (NOAA) (United States); Bonneville Power Administration (BPA) (United States); United States Army Corps of Engineers (USACE)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; sediment model; model validation; sediment dynamics; estuaries; Columbia River
OSTI Identifier:
1376984
Alternate Identifier(s):
OSTI ID: 1425614