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Permanent link (DOI): https://doi.org/10.7939/R3377641M

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Teleconnection, Modeling, Climate Anomalies Impact and Forecasting of Rainfall and Streamflow of the Upper Blue Nile River Basin Open Access

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Other title
TELECONNECT BLUE NILE BASIN RAINFALL & RUNOFF
Subject/Keyword
Climate Variability
Rainfall Variability
Nile River
Wavelet Empirical Orthogonal Function
Sacramento Model
Ethiopia
Artificial Neural Network- Genetic Algorithms
Water Resources Management
Egypt
Indian Ocean Dipole
Hydrologic modeling
Interaction Soil Biosphere Atmosphere model
Teleconnection
Upper Blue Nile River Basin
Seasonal Precipitation
Global Oceanic Sea Surface Temperature
Irrigation Improvement Project
Climate Anomalies
Disaggregation
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Elsanabary, Mohamed Helmy Mahmoud Moustafa
Supervisor and department
Paul Myers (Earth and Atmospheric Sciences)
Mohamed Al-Hussein (Civil and Environmental Engineering)
Thian Yew Gan (Departement of Civil and Environmental Engineering)
Examining committee member and department
Evan Davies (Civil and Environmental Engineering)
D. J. (Dave) Sauchyn (Senior Research Scientist (PARC) and Professor of Geography (University of Regina)
Marwan El-Rich (Civil and Environmental Engineering)
Thian Yew Gan (Departement of Civil and Environmental Engineering)
Yang Liu (Civil and Environmental Engineering)
Paul Myers (Earth and Atmospheric Sciences)
Department
Department of Civil and Environmental Engineering
Specialization
Water Resources Engineering
Date accepted
2012-07-10T15:45:32Z
Graduation date
2012-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
The Nile River, the primary water resource and the life artery for the downstream countries, Egypt and Sudan, exhibits strong seasonal fluctuations. The Upper Blue Nile basin (UBNB), the most significant tributary of the Nile, contributes more than half of the Nile’s streamflow. Prompted by the lack of knowledge on the nonstationarity of hydro-climatic processes in the Ethiopian Highlands (EH), and the Oceanic Sea Surface Temperature (SST), this thesis employed the nonstationary techniques of Wavelet principal component analysis (WPCA) and coherence analysis to identify the spatial, temporal and frequency variability regimes of these hydro-climatic processes. A fully distributed, physically-based model, which is a modified version of the Interactions Soil-Biosphere-Atmosphere (MISBA), and a lumped- conceptual SAC-SMA model, was used to model the UBNB streamflow. To study the potential effect of climate anomalies on the UBNB, years of rainfall/temperature data, when climate anomalies are active, were re-sampled and used to drive MISBA and SAC-SMA. An artificial neural network calibrated by a genetic algorithm (ANN-GA) model, is developed to forecast the seasonal rainfall of UBNB through teleconnection with selected sectors of SST. Results show that seasonal rainfall predicted by ANN-GA agrees well with the observed rainfall data of UBNB. The Valencia and Schaake model was used to disaggregate the forecasted seasonal rainfall to weekly rainfall, which was found to reasonably capture the UBNB observed weekly rainfall characteristics. ANN-GA was developed to directly forecast the UBNB seasonal streamflow from seasonal oceanic SST and then disaggregated to weekly streamflow. To improve the streamflow forecast, we combined the forecasted seasonal rainfall, in addition to the SST predictors. Results indicate that forecasts based on climate indices alone possess considerable skill (correlation of 0.66) with up to four months lead time, while combining the rainfall and SST as predictors provides better results (correlation of 0.83). The analysis of nonstationary energy helped to determine the effects of global oceanic anomalies on the rainfall/streamflow of the UBNB. Knowledge on these effects on UBNB will be useful to the planning and water resources management of the Nile River, especially under the impact of both climate variability and impending droughts.
Language
English
DOI
doi:10.7939/R3377641M
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Elsanabary, M. H. and Gan, T. Y. (2012). "Investigation of Seasonal Rainfall Variability Over the Ethiopian Highlands: Teleconnection Between the Upper Blue Nile Basin Rainfall and the Oceanic Anomalies", Proc. Conf. 2012 CSCE Annual General Conference, June 6-9, 2012, Edmonton, AB, CA.

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