Elements for the successful computer simulation of sediment management strategies for reservoirs

Authors: ANARIEH, R - Brigham Young University; HOTCHKISS, ROLLIN - Brigham Young University; Langendoen, Eddy

Submitted to: Water
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/2/2020
Publication Date: 3/5/2020
Citation: Anarieh, R., Hotchkiss, R.H., Langendoen, E.J. 2020. Elements for the successful computer simulation of sediment management strategies for reservoirs. Water. 12(3): 714. https://doi.org/10.3390/w12030714.
DOI: https://doi.org/10.3390/w12030714

Interpretive Summary: Global reservoir storage space is shrinking because of sediment accumulation, particular so in the US where no new dams are being constructed. Reservoirs, as a vital component of water infrastructure, are thus non-sustainable and mitigation measures are urgently needed to increase project lifetimes. The prediction of sediment yield, deposition and erosion associated with reservoirs is therefore critical, including simulating the various sediment management alternatives. ARS researchers at Oxford, MS, in collaboration with researchers from Brigham Young University conducted a review of published computer simulations of reservoir sediment management methods. One-dimensional computer models were found to be adequate for long-term simulations of the evolving reservoir bottom profile, while two- or three-dimensional models are more appropriate for simulating density currents and detailed lateral movement of sediments, which occur during reservoir flushing scenarios. Existing codes can successfully simulate sediment management but require seasoned judgment in their choice, application, and interpretation. The review provides helpful information to federal and state agencies responsible for maintaining dam safety.

Technical Abstract: Computer simulation of reservoir sediment management strategies is becoming more important as worldwide water supply shrinks due to sediment deposition while population growth continues. We identified the physical processes underlying each of the several alternatives available to transport incoming or deposited sediments downstream into receiving waters and the governing equations that describe each process. We then described commonly available computer codes and their abilities to solve the appropriate equations in one, two, or three dimensions. We found that one dimensional models are most appropriate for long-term simulations of the evolving reservoir bottom profile, while two or three dimensional codes are more appropriate for simulating density currents and detailed lateral movement of sediments such as during local pressure flushing near reservoir outlets. We conclude that existing codes can successfully simulate sediment management but require seasoned judgment in their choice, application, and interpretation.