Analysis of Surface Deformation in East Dongting Lake Based on 2016-2019 Sentinel-1A Dataset

Table 3

Comparison of the intensity grades of surface deformation in the flood seasons.

Intensity grade of surface deformation	Surface deformation area in the flood season
	2017		2018		2019
	Area (km^2)	%	Area (km^2)	%	Area (km^2)	%
Severe settlement	0.16	0.019	0	0	3.11	0.352
Moderate settlement	20.75	2.493	4.85	0.550	32.80	3.717
Slight settlement	211.37	25.396	187.88	21.282	200.53	22.727
Stable area	309.07	37.135	503.14	56.994	348.10	39.451
Slight sedimentation	277.50	31.805	185.93	21.061	257.34	29.165
Severe sedimentation	13.44	1.802	1.00	0.113	40.49	4.588