settlement ruins emerged, China

as Chanzhi Reservoir drained to give space to fertile soil and crops, ruins of a forgotten settlement has been emerged:

2013:


2014: (under ice on HERE Maps imagery)


2017:





(check historical imagery with GE TimeSlider tool)
settlement ruins emerged.kmz (973 B)



no further info on settlement even not on Chanzhi Reservoir and its draining so far...

can anyone around help me out with this one?

thanks!
g