Figure 3

Temporal and spatial variations in the salinity of different brine layers in Luobei depression. (a) Layer W1 in 2006, (b) Layer W1 in 2017, (c) Layer W2 in 2006, (d) Layer W2 in 2017, (e) Layer W3 in 2006 and (f) Layer W3 in 2017. The green dots indicate observation holes locations.