Predicting Suspended Sediment Loads and Missing Data for Gediz River, Turkey
Publication: Journal of Hydrologic Engineering
Volume 14, Issue 9
Abstract
Prediction of suspended sediment load (SSL) is important for water resources quantity and quality studies. The SSL of a stream is generally determined by direct measurement of the suspended sediment concentration or by employing sediment rating curve method. Although direct measurement is the most reliable method, it is very expensive, time consuming, and, in many instances, problematic for inaccessible sections, especially during floods. On the other hand, measuring precipitation and flow discharge is relatively easier and hence, there are more rain and flow gauging stations than SSL gauging stations in Turkey. Furthermore, due to its cost, measurements of SSL are carried out in longer periods compared to precipitation and flow measurements. Although daily precipitation and flow measurements are available for most of the Turkish river basins, at best semimonthly measurements are available for SSL. As such, it is essential to predict SSL from precipitation and flow data and to fill the gap for the missing data records. This study employed artificial intelligence methods of artificial neural networks (ANN) and neurofuzzy inference system, the sediment rating curve method, multilinear regression, and multinonlinear regression methods for this purpose. The comparative analysis of the results showed that the artificial intelligence methods have superiority over the other methods for predicting semimonthly suspended sediment loads. The ANN using conjugate gradient optimization method showed the best performance among the proposed models. It also satisfactorily generated daily SSL data for the missing period record of Gediz River, Turkey.
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Acknowledgments
The writers thank the EIE (The General Directorate of Electrical Power and Resource Server of Turkey) for providing the hydrologic data and the DMI (The State Meteorological Service of Turkey) for providing the meteorological data used in the study.
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Information
Published In
Journal of Hydrologic Engineering
Volume 14 • Issue 9 • September 2009
Pages: 954 - 965
Copyright
© 2009 ASCE.
History
Received: Apr 11, 2008
Accepted: Dec 3, 2008
Published online: Feb 18, 2009
Published in print: Sep 2009
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