Uncertainty in suspended sediment load estimates for mountain rivers. Case of study of central andes in Peru

Sergio Morera-Julca, Abel Mejia-Marcacuzco, Jean Loup Guyot, Carlos Gálvez, Francisco Salinas, Manuel Collas, Eusebio Ingol-Blanco

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

This study evaluates the uncertainty in the estimation of annual and monthly sediment flows in four mountain basins of the Pacific Ocean in Peru. For this end, samples at different time scales (hourly, daily, and monthly) were recorded. The database was broken down into a numerical base to simulate several sampling frequencies. From these timing frequencies, the annual and monthly flow was computed. Likewise, we compare the observed and simulated data, calculating the degree of uncertainty using statistical tests. The results for the 25 and 75 percentiles show that there is a high temporal variability in these Andean watersheds, whose strategy of measurement of solid flows can vary from six to 12 days, thus underestimating ~ 20% annually. While for estimating suspended sediment yield (SY) to a monthly time step in the rainy season (December to May), a sampling frequency between 1-5 days, which would lead to a maximum error of ± 40% being needed. However, for the dry season (June to September), the sampling can be done one time per month for an error of ± 45%, which is less than 2% in an annual balance. Finally, the results show that the sampling frequency values mentioned above should be reduced to half, for exceptional events (rainy season) where the annual error estimate is around 300%.

Original languageEnglish
Title of host publicationWorld Environmental and Water Resources Congress 2013
Subtitle of host publicationShowcasing the Future - Proceedings of the 2013 Congress
Pages3216-3225
Number of pages10
StatePublished - 18 Nov 2013
EventWorld Environmental and Water Resources Congress 2013: Showcasing the Future - Cincinnati, OH, United States
Duration: 19 May 201323 May 2013

Publication series

NameWorld Environmental and Water Resources Congress 2013: Showcasing the Future - Proceedings of the 2013 Congress

Conference

ConferenceWorld Environmental and Water Resources Congress 2013: Showcasing the Future
CountryUnited States
CityCincinnati, OH
Period19/05/1323/05/13

Keywords

  • Mountain Rivers
  • Peru
  • Solid Flow
  • Suspended Sediment Load
  • Uncertainty

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