This Shiny app provides a way of exploring and evaluating trends in peak flow and daily flow data within the measuring stations with records in the National River Flow Archive. The main purpose is to highlight trends in peak flow and daily flow percentiles by using the Theil Sen estimator of trend.
The outputs here are based on data taken using the NRFA API, and are designed to match the station trends pages on the NRFA webpage.
On each tab, you can select a station and the data will be plotted along with lines of trend or long-term stationary averages. On each plot, you can highlight a section of the data and the trend will be shown based on just the highlighted section, showing the sensitivity of trend calculation to length of record.
On the "Triangle Trends" page, a full summary of the AMAX analysis is presented for those stations with more than 26 years of data, where all the possible periods of record are shown, and the associated trends.
Note that only stations of sufficient quality are included for AMAX analysis.
This work was supported by the Natural Environment Research Council award number NE/R016429/1 as part of the UK-SCAPE programme delivering National Capability.