Details

Autor(en) / Beteiligte

• Atieh, M.
• Mehltretter, S.L.
• Gharabaghi, B.
• Rudra, R.

Titel

Integrative neural networks model for prediction of sediment rating curve parameters for ungauged basins

Ist Teil von

• Journal of hydrology (Amsterdam), 2015-12, Vol.531, p.1095-1107

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Developed novel ANN models for sediment rating curve for ungauged basins.•Integrated topographic, land use, soil, climatic, & hydrometric factors in ANN model.•Trained and validated ANN models using data from 94 basins in Ontario, Canada.•Rating coefficient directly proportional to R, K, & AEDI and inversely to VEG & MAS.•Rating exponent directly proportional to MAP, SLP, & AEDI and inversely to AWT. One of the most uncertain modeling tasks in hydrology is the prediction of ungauged stream sediment load and concentration statistics. This study presents integrated artificial neural networks (ANN) models for prediction of sediment rating curve parameters (rating curve coefficient α and rating curve exponent β) for ungauged basins. The ANN models integrate a comprehensive list of input parameters to improve the accuracy achieved; the input parameters used include: soil, land use, topographic, climatic, and hydrometric data sets. The ANN models were trained on the randomly selected 2/3 of the dataset of 94 gauged streams in Ontario, Canada and validated on the remaining 1/3. The developed models have high correlation coefficients of 0.92 and 0.86 for α and β, respectively. The ANN model for the rating coefficient α is directly proportional to rainfall erosivity factor, soil erodibility factor, and apportionment entropy disorder index, whereas it is inversely proportional to vegetation cover and mean annual snowfall. The ANN model for the rating exponent β is directly proportional to mean annual precipitation, the apportionment entropy disorder index, main channel slope, standard deviation of daily discharge, and inversely proportional to the fraction of basin area covered by wetlands and swamps. Sediment rating curves are essential tools for the calculation of sediment load, concentration-duration curve (CDC), and concentration–duration–frequency (CDF) analysis for more accurate assessment of water quality for ungauged basins.