Fig. 2: Comparison in simulated annual runoff in 1931 and 1998.
From: Flood modeling prior to the instrumental era reveals limited magnitude of 1931 Yangtze flood
a and b show the spatial distribution of annual runoff (unit: mm) in 1931 and 1998, respectively. The red 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 spatial units (color blocks). The mean (m) and standard deviation (std) were calculated based on the annual runoff of all the units over 1982–2000. c displays the regional annual runoff (unit: 109 m3) averaged over the spatial units within each of these sub-catchments, blue for 1931 and orange for 1998. The red number indicates the change in percentage in 1931 relative to 1998. Yup, Ymd, and All indicate the upstream, mid-downstream, and entire watershed.
