Table 2.

Lake drainage mechanism in each of the three study time periods relative to high, moderate, and low volumetric ground ice content in permafrost terrain derived from Jorgenson et al39

	Drainage mechanism
Time period	Bank overtopping or headward erosion			Lake expansion			River meandering			Coastal erosion
	High	Mod	Low	High	Mod	Low	High	Mod	Low	High	Mod	Low
1955–1975	3	9	11	3	1	2	0	6	2	1	1	0
1975–2000	3	12	12	1	2	1	0	2	5	1	0	0
2000–2017	2	13	1	0	1	0	0	1	2	0	0	0