Trend analysis and variability of satellite-based soil moisture data for the Lower Bhavani basin, Tamil Nadu using Google Earth Engine

Janani N; Balaji Kannan; Nagarajan K; Thiyagarajan G; Duraisamy M R

doi:10.31018/jans.v15i2.4515

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Published Jun 20, 2023

DOI: https://doi.org/10.31018/jans.v15i2.4515

Janani N

Department of Soil and Water Conservation Engineering, AEC&RI, Tamil Nadu Agricultural University, Coimbatore- 641003 (Tamil Nadu), India

Balaji Kannan

Department of Physical Science and Information Technology, AEC&RI, Tamil Nadu Agricultural University, Coimbatore- 641003 (Tamil Nadu), India

Nagarajan K

Department of Soil and Water Conservation Engineering, AEC&RI, Tamil Nadu Agricultural University, Kumulur- 621712 (Tamil Nadu), India

Thiyagarajan G

Department of Soil and Water Conservation Engineering, AEC&RI, Tamil Nadu Agricultural University, Kumulur- 621712 (Tamil Nadu), India

Duraisamy M R

Department of Physical Science and Information Technology, AEC&RI, Tamil Nadu Agricultural University, Coimbatore- 641003 (Tamil Nadu), India

Abstract

Soil moisture is a significant hydrological component that is dynamic in nature. The variation in soil moisture in the basin scale would affect the vegetation, ecology and environment. Soil moisture trend analysis aids in providing the variation of soil moisture over the basin. The present study aimed to analyse the soil moisture trend in Lower Bhavani basin, Tamil Nadu from 2003-2022. Satellite-based soil moisture Global Land Data Assimilation System (GLDAS) data was extracted from the Google Earth Engine (GEE) platform to analyse the variation and trend over the period of time. The highest and lowest soil moisture was observed during monsoon and summer months and its percentage variation was studied. Using Man-Kendall test and Sen’s slope, trend analysis was calculated for two decades (2003-2012 and 2013-2022). In 2003-2012, an increasing trend of soil moisture was observed during winter (October to February); from 2013-2022, an increasing trend was observed during both winter (October to February) and monsoon seasons (June to September). The remaining season did not follow any trend, and there was no decreasing trend in soil moisture. The trend analysis of the study will help to monitor and manage the environmental system across the Lower Bhavani basin.

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References

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Trend analysis and variability of satellite-based soil moisture data for the Lower Bhavani basin, Tamil Nadu using Google Earth Engine. (2023). Journal of Applied and Natural Science, 15(2), 555-559. https://doi.org/10.31018/jans.v15i2.4515

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