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Sequence-Average and Cumulative Flow Loss Analyses for Colorado River Streamflow at Lees Ferry
This dataset holds scripts for Sequence-Average and Cumulative Flow Loss analyses developed to examine the severity of sustained droughts that have impact on storage and water supply in the Colorado River Basin. These analyses were performed using the methods described in Center for Colorado River Studies Future of the Colorado River Project white paper 4 entitled “The Future Hydrology of the Colorado River Basin” by Salehabadi, Tarboton et al. (2020). This study analyzed the US Bureau of Reclamation Natural flow and Tree Ring Reconstructed flow from Meko et.al., 2017, both at Lees Ferry, using the Sequence-Average and Cumulative Flow Loss plots, which show the mean flow and cumulative magnitude of departure from average conditions, or “flow loss”, for different durations. These plots presented by Salehabadi, Tarboton et al. (2020) characterize the severity of past droughts that have occurred in the Colorado River Basin. Based on examination of these plots, this study defined three drought scenarios: (1) Millennium Drought, (2) Mid-20th Century Drought, and (3) Paleo Tree Ring Severe Drought. The first two were defined using the US Bureau of Reclamation Natural flows from 2000-2018 and 1953-1977 respectively. The last was defined using the years 1576-1600 from the Meko et al., 2017 tree ring reconstruction of streamflow at Lees Ferry.
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Resource Level Coverage
Spatial
Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Colorado River Basin
North Latitude
41.5424°
East Longitude
-104.6569°
South Latitude
30.7901°
West Longitude
-116.2585°
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Sequence-Average and Cumulative Flow Loss analyses performed by Salehabadi, Tarboton et al. (2020) to examine the severity of sustained droughts that have impact on storage and water supply in the Colorado River Basin.
In this resource, there are two scripts and one Excel file.
• "SeqAvePlot.R" : R code to generate Sequence-Average plots.
• "CumulativeFlowLoss.R" : R- code to generate Cumulative Flow Loss plots.
• "R_InputData.xlsx" : Input file for the scripts comprising two sheets as follows.
1. “AnnualWYTotalNaturalFlow_LF2018” sheet, which contains the annual water year total natural flow at Lees Ferry from U.S. Bureau of Reclamation, (2020), https://www.usbr.gov/lc/region/g4000/NaturalFlow/current.html.
2. “TR_Meko_2017-SK” sheet, which contains annual tree ring reconstructed flow at Lees Ferry from the most skillful model of Meko et al., 2017.
References
Meko, D. M., C. A. Woodhouse and E. R. Bigio, (2017), "Southern California Tree-Ring Study," California Department of Water Resources, https://pdfs.semanticscholar.org/fbaf/487604e2537c8f51037035e59c13113edeeb.pdf.
Salehabadi, H., D. Tarboton, E. Kuhn, B. Udall, K. Wheeler, D. Rosenberg, S. Goeking and J. C. Schmidt, (2020), "The Future Hydrology of the Colorado River Basin," Center for Colorado River Studies, White Paper 4, Utah State University, https://qcnr.usu.edu/coloradoriver/files/WhitePaper4.pdf.
U.S. Bureau of Reclamation, (2020), Colorado River Basin Natural Flow and Salt Data, Colorado River Basin Natural Flow Database. Last modified January 10, 2020, https://www.usbr.gov/lc/region/g4000/NaturalFlow/current.html
Salehabadi, H., D. Tarboton, E. Kuhn, B. Udall, K. Wheeler, D. Rosenberg, S. Goeking and J. C. Schmidt, (2020), "The Future Hydrology of the Colorado River Basin," Center for Colorado River Studies, White Paper 4, Utah State University, https://qcnr.usu.edu/coloradoriver/files/WhitePaper4.pdf.
This resource was created using funding from the following sources:
Agency Name
Award Title
Award Number
Walton Family Foundation
Catena Foundation
Contributors
People or Organizations that contributed technically, materially, financially, or provided general support for the
creation of the resource's content but are not considered authors.
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