Input-variable sensitivity assessment for sediment transport relations

Roberto Fernández, Marcelo Horacio Garcia

Research output: Contribution to journalArticle

Abstract

A methodology to assess input-variable sensitivity for sediment transport relations is presented. The Mean Value First Order Second Moment Method (MVFOSM) is applied to two bed load transport equations showing that it may be used to rank all input variables in terms of how their specific variance affects the overall variance of the sediment transport estimation. In sites where data are scarce or nonexistent, the results obtained may be used to (i) determine what variables would have the largest impact when estimating sediment loads in the absence of field observations and (ii) design field campaigns to specifically measure those variables for which a given transport equation is most sensitive; in sites where data are readily available, the results would allow quantifying the effect that the variance associated with each input variable has on the variance of the sediment transport estimates. An application of the method to two transport relations using data from a tropical mountain river in Costa Rica is implemented to exemplify the potential of the method in places where input data are limited. Results are compared against Monte Carlo simulations to assess the reliability of the method and validate its results. For both of the sediment transport relations used in the sensitivity analysis, accurate knowledge of sediment size was found to have more impact on sediment transport predictions than precise knowledge of other input variables such as channel slope and flow discharge.

Original languageEnglish (US)
Pages (from-to)8105-8119
Number of pages15
JournalWater Resources Research
Volume53
Issue number9
DOIs
StatePublished - Sep 2017

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sediment transport
bedload
sediment
sensitivity analysis
mountain
methodology
method
prediction
river
simulation

Keywords

  • input variable
  • sediment transport
  • sensitivity

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

Input-variable sensitivity assessment for sediment transport relations. / Fernández, Roberto; Garcia, Marcelo Horacio.

In: Water Resources Research, Vol. 53, No. 9, 09.2017, p. 8105-8119.

Research output: Contribution to journalArticle

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