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Document type:
Zeitschriftenaufsatz 
Author(s):
Tarar, Zeeshan Riaz; Ahmad, Sajid Rashid; Ahmad, Iftikhar; Hasson, Shabeh ul; Khan, Zahid Mahmood; Washakh, Rana Muhammad Ali; Ateeq-Ur-Rehman, Sardar; Bui, Minh Duc 
Title:
Effect of Sediment Load Boundary Conditions in Predicting Sediment Delta of Tarbela Reservoir in Pakistan 
Abstract:
Setting precise sediment load boundary conditions plays a central role in robust modeling of sedimentation in reservoirs. In the presented study, we modeled sediment transport in Tarbela Reservoir using sediment rating curves (SRC) and wavelet artificial neural networks (WA-ANNs) for setting sediment load boundary conditions in the HEC-RAS 1D numerical model. The reconstruction performance of SRC for finding the missing sediment sampling data was at R2 = 0.655 and NSE = 0.635. The same performance using WA-ANNs was at R2 = 0.771 and NSE = 0.771. As the WA-ANNs have better ability to model non-linear sediment transport behavior in the Upper Indus River, the reconstructed missing suspended sediment load data were more accurate. Therefore, using more accurately-reconstructed sediment load boundary conditions in HEC-RAS, the model was better morphodynamically calibrated with R2 = 0.980 and NSE = 0.979. Using SRC-based sediment load boundary conditions, the HEC-RAS model was calibrated with R2 = 0.959 and NSE = 0.943. Both models validated the delta movement in the Tarbela Reservoir with R2 = 0.968, NSE = 0.959 and R2 = 0.950, NSE = 0.893 usingWA-ANN and SRC estimates, respectively. Unlike SRC,WA-ANN-based boundary conditions provided stable simulations in HEC-RAS. In addition, WA-ANN-predicted sediment load also suggested a decrease in supply of sediment significantly to the Tarbela Reservoir in the future due to intra-annual shifting of flows from summer to pre- and post-winter. Therefore, our future predictions also suggested the stability of the sediment delta. As the WA-ANN-based sediment load boundary conditions precisely represented the physics of sediment transport, the modeling concept could very likely be used to study bed level changes in reservoirs/rivers elsewhere in the world. 
Keywords:
Upper Indus Basin (UIB); Tarbela Reservoir; Besham Qila; sediment modeling; uncertainty; wavelet transform analysis-artificial neural network (WA-ANN); sediment rating curve (SRC); HEC-RAS 
Dewey Decimal Classification:
620 Ingenieurwissenschaften 
Journal title:
Water 
Year:
2019 
Journal volume:
11 
Journal issue:
Pages contribution:
1716 (20 p.) 
Covered by:
Scopus; Web of Science 
Reviewed:
ja 
Language:
en 
Fulltext / DOI:
Publisher:
MDPI AG 
Publisher address:
Basel, Switzerland 
E-ISSN:
2073-4441 
Impact Factor:
2.524 (2018) 
Date of publication:
18.08.2019 
Format:
Text 
CC license:
by, http://creativecommons.org/licenses/by/4.0