The groundwater monitoring network design involves the determination of the sampling locations and sampling frequencies to characterize the contaminant plume in an aquifer over space and time.

In this paper, the principle of Sampling Time Staggered Space Vector Modulation (STS-SVM) as well as its realizing method in cascade multilevel converters is presented.

Through sampling soils of different years and depth in the reclaimed areas of Fushun coal mine, we analyzed the space-time change of soil nutrients and organic carbon.