Spatial-Temporal Changes of Abarkuh Playa Landform from Sentinel-1 Time Series Data

Playas, as the flattest landforms in semiarid and arid regions, are extremely sensitive to climate changes, such as changes in the hydrologic regime of the landscape. The changes in these landforms due to irrigation, anthropogenic activities, and climate change could be a source of disasters. In this study, we explored the spatial-temporal changes of the Abarkuh Playa in Central Iran using the time series of the Sentinel-1 backscatter dataset in the three scales. Our results showed that the western area of the Abarkuh Playa has been changed to other landforms with different characteristics, which is clear from all backscatter maps. The spatial-temporal analysis of the time series of backscatter data using the independent component analysis and time series of precipitation revealed that the backscatter variations were associated with direct rainfall across the playa and the surface was reacting to changes in the soil moisture content. The results of the power scale showed that the boundary of the playa could successfully be recognized as the oscillating pattern from other landforms in the study area. Moreover, the spatial-temporal analysis of backscatter in the power scale showed that different polarizations could reveal different patterns of surface changes for the playa.

Automated summary

In this study, the spatial-temporal changes of the Abarkuh Playa in Central Iran were explored using the time series of the Sentinel-1 backscatter dataset in three scales. The results showed that the western area of the Abarkuh Playa has transformed into other landforms with different characteristics. The spatial-temporal analysis of the backscatter data revealed the association between backscatter variations and direct rainfall, as well as changes in soil moisture content.