Fig. 3: Comparison in flood intensity in 1931 and 1998.
From: Flood modeling prior to the instrumental era reveals limited magnitude of 1931 Yangtze flood
Flood intensity (unit: 1) in a year of each spatial unit (in total 279, color blocks in a, b) is calculated as the average of standardized discharges above 1.28 (90% quantile of daily discharges over 1982–2000). a and b show the spatial distribution of flood intensity in 1931 and 1998, respectively. The gray polygons divide the Yangtze River Watershed into 11 sub-catchments (Mu, Mm, Ml, Jsu, Jsl, M, J, W, H, D, P), each composed of a subset of the 279 units. The mean (m) and standard deviation (std) were calculated based on the flood intensity of all 279 units over 1982–2000. c displays the regional flood intensity in 1931 (the blue) and 1998 (the orange) in the 11 sub-catchments of the Yangtze River Watershed. Yup, Ymd, and All indicate the upstream, mid-downstream, and entire watershed. The horizontal black lines (whiskers) show flood intensity start and end. The left and right bounds of the boxes are the first and third quartiles. The red bar in the middle shows the average.
