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Article
Analysis of Dam-Induced Cyclic Patterns on River Flow Dynamics
Hydrological Sciences Journal
  • Hakan Tongal, Süleyman Demirel University
  • Mehmet C. Demirel, Geological Survey of Denmark and Greenland
  • Hamid Moradkhani, Portland State University
Document Type
Citation
Publication Date
12-1-2016
Disciplines
Abstract
This paper investigates the impact of the Hungry Horse Dam on streamflow dynamics in the South Fork of the Flathead River, Montana, USA. To this end, pre- and post-dam periods of raw and naturalized streamflow data were analysed. Pettitt’s change point analysis indicated a significant change point in streamflow dynamics due to dam construction. Complexities in the pre- and post-dam periods were evaluated by sample and multi-scale entropy analyses, and the entropies of the post-dam period were found to be higher than those of the pre-dam period. Possible reasons for this, unrelated to the natural hydrological cycle caused by the dam, were analysed using wavelet analyses. The wavelet analyses showed a clear change in the phase relationship between precipitation and streamflow. Finally, weak positive trends found in the hydrological variables indicated the effects of human activities (e.g. dam construction). The results also revealed distorted lead times, which can improve the streamflow forecasts for different lead times.
DOI
10.1080/02626667.2016.1252841
Persistent Identifier
http://archives.pdx.edu/ds/psu/19402
Citation Information
Tongal, H., Demirel, M. C., & Moradkhani, H. (2016). Analysis of dam-induced cyclic patterns on river flow dynamics. Hydrological Sciences Journal, 1-16.