Duration-Severity and Cumulative Deficit Analyses for Colorado River Streamflow at Lees Ferry

This dataset holds scripts for Duration-Severity and Cumulative Deficit 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 Salehabadi, Tarboton et al. (2022; 2020). These studies analyzed the US Bureau of Reclamation Natural flow and Tree Ring Reconstructed flow from Meko et.al., 2017, both at Lees Ferry, using the Duration-Severity and Cumulative Deficit plots, which show the mean flow and cumulative magnitude of departure from average conditions, or “deficit”, for different durations. These plots presented by Salehabadi, Tarboton et al. (2020; 2022) 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 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.

- Salehabadi, H., D. G. Tarboton, B. H. Udall, K. G. Wheeler and J. C. Schmidt, (2022), \"An Assessment of Potential Severe Droughts in the Colorado River Basin,\" JAWRA Journal of the American Water Resources Association, https://doi.org/10.1111/1752-1688.13061.
- Salehabadi, H., D. G. Tarboton, E. Kuhn, B. Udall, K. G. Wheeler, D. E. Rosenberg, S. A. Goeking and J. C. Schmidt, (2020), \"The Future Hydrology of the Colorado River Basin,\" White Paper 4, Future of the Colorado River Project, Center for Colorado River Studies, Utah State University, 71 p., https://qcnr.usu.edu/coloradoriver/files/WhitePaper4.pdf.

本数据集包含用于**历时-严重程度（Duration-Severity）**与**累积亏缺（Cumulative Deficit）**分析的脚本，旨在评估持续干旱对科罗拉多河流域（Colorado River Basin）蓄水与供水造成的影响严重程度。

此类分析采用Salehabadi、Tarboton等人（2022；2020）提出的方法开展。相关研究以Meko等人（2017）发布的利斯费里（Lees Ferry）监测点处的美国垦务局（US Bureau of Reclamation）天然径流与树木年轮重建径流（Tree Ring Reconstructed flow）数据为基础，通过历时-严重程度与累积亏缺图，展示不同历时下的平均径流与偏离平均状态的累积幅度，即所谓“亏缺”量。

Salehabadi、Tarboton等人（2020；2022）提出的此类图表，可用于表征科罗拉多河流域历史干旱的严重程度。本研究通过对这些图表的分析，划定了三类干旱情景：（1）千禧年干旱，（2）20世纪中期干旱，（3）古树木年轮干旱。其中前两类干旱分别以2000-2018年与1953-1977年的美国垦务局天然径流数据定义，最后一类则基于Meko等人（2017）重建的利斯费里监测点处1576-1600年的树轮径流数据划定。

- Salehabadi, H., D. G. Tarboton, B. H. Udall, K. G. Wheeler 与 J. C. Schmidt（2022），《科罗拉多河流域潜在严重干旱评估》，《美国水资源协会期刊（JAWRA Journal of the American Water Resources Association）》，https://doi.org/10.1111/1752-1688.13061.
- Salehabadi, H., D. G. Tarboton, E. Kuhn, B. Udall, K. G. Wheeler, D. E. Rosenberg, S. A. Goeking 与 J. C. Schmidt（2020），《科罗拉多河流域未来水文情势》，《科罗拉多河流域未来项目白皮书4》，犹他州立大学科罗拉多河流域研究中心，共71页，https://qcnr.usu.edu/coloradoriver/files/WhitePaper4.pdf.