Rainfall Erosivity Assessment –Spatial & Temporal Variability in Andhra Pradesh and Telangana States in India
Journal Title: International Journal of Agricultural Science and Research (IJASR) - Year 2018, Vol 8, Issue 1
Abstract
A study was made to estimate the spatial and temporal trends of rainfall erosivity in the erstwhile state of Andhra Pradesh. Daily rainfall data of 1142 stations across the erstwhile states of Andhra Pradesh and Telangana were used to estimate the rainfall erosivity values. Based on this, relationships were established to estimate the rainfall erosivity, when weekly/ monthly yearly rainfall is available. Established a relationship between yearly rainfall erosivity and Fournier Index, a factor considered to be influencing land degradation, to determine the factor of rainfall erosivity in the wider area. Average annual erosivity maps were developed for spatial distribution assessment of erosivity. The study revealed that annual erosivity index (EI30) ranges from 992.97 t ha-1 cm h-1 at Anantapur in Rayalaseema region to 2975.4 t ha-1 cm h-1 at Nellore in Costal Andhra region. The average annual rainfall erosivity index for erstwhile state of Andhra Pradesh was 1986.40 t ha-1 cm h-1. Average monthly rainfall erosivity factor values showed that the maximum values of rainfall erosivity occur in June to October as the average rainfall also has the maximum values in these months; the highest erosion intensity can be expected during these months. The average annual erosivity factor in rainfall erosion index map was useful to determine the variability in erosivity at different locations in state/districts. It was found that the maximum average annual rainfall erosivity factor ranged from 2950 to 3450 t ha-1 cm h-1for one station and minimum value of 950 to 1450 t ha-1 cm h-1 was found in six stations of different districts.
Authors and Affiliations
N. BHARATHI, V. VASUDEVA RAO, I. BHASKARA RAO, K. V. RAO, A. P. MUKHARJEE
Keywords
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- EP ID EP276986
- DOI 10.24247/ijasrfeb201816
- Views 109
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