Figure 5 Dynamics on the formation and changes of polder landscapes. (a) Summer insolation at 30°N (W/m2) (Berger and Loutre, 1991); (b) Annual mean temperature (°C) (Zhu et al., 2008); (c) Annual precipitation (mm) (Sun et al., 2019); (d) Average chain length value (Liu et al., 2018); (e) Sea level (m) (Xie et al., 2012); (f) Population density (Pop./km2) (Zheng, 2019); (g) Newly built area (km2), (h) Total cumulative area (km2); and (i) Wetland area (km2).
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