whereas the least variability occurred over the central to southern parts in most
months.
Conclusions
In this study, an attempt has been made to examine the spatial and temporal trends in
rainfall over Sahibi Basin in Rajasthan State of India for a period of 57 years
(1961–2017). The results have shown a very high interannual variability in mean
annual rainfall, ranging from 217.33 mm in 2002 to 1214.96 mm in 1996, with a
mean annual value of 633.95 mm (SD ¼ 204.93, CV ¼ 32.33). However, no
significant increasing or declining trend was observed in mean annual rainfall over
Sahibi Basin during this 57-year period. Kotkasim and Tapukara stations have
shown substantial rising and declining trends, respectively. The monsoon season
contributes about 87% of mean annual rainfall. Pre-monsoon season rainfall has
shown a significant increasing trend; the winter season rainfall has shown an
insignificant increasing trend. Conversely, monsoon and post-monsoon season rainfall has shown insignificant decreasing trends. The months of July and August
account for approximately 63% of the total annual rainfall. However, these months
have shown nonsignificant declining trends. The month of June has shown a
significant increasing trend in the amount of rainfall over Sahibi Basin. Spatial
analysis has shown an increase in rainfall from the northeastern and western to
southeastward areas. This increase in rainfall toward the southeast may be attributed
to the existence of the Aravalli Mountains. The northeastern and western parts of the
basin have received less rainfall. The maximum mean amount of rainfall (about
708 mm) occurred over Thanagaji station in the south, whereas the least (about
575 mm) was seen over Tapukara station in the north. The observed spatial and
temporal variability in the amount of rainfall is high for such a small basin. From
these findings, it can be inferred that rainfall differs significantly during seasons and
months with great spatial and temporal variability. Finally, the results of this study
will be useful for management of water resources for future planning of irrigation
and agricultural practices over the semiarid Sahibi Basin.
References
Abeysingha NS, Singh M, Sehgal VK, Khanna M, Pathak M (2014) Analysis of rainfall and
temperature trends in Gomti River basin. J Agric Phys 14:56–66
Amoussou E, Awoye H, Totin Vodounon HS, Obahoundje S, Camberlin P, Diedhiou A,
Kouadio K, Mahé G, Houndénou C, Boko M (2020) Climate and extreme rainfall events in
the Mono River Basin (West Africa): investigating future changes with regional climate models.
Water 12:833
12 Trends and Pattern of Rainfall over Semiarid Sahibi Basin in Rajasthan, India
295
months.
Conclusions
In this study, an attempt has been made to examine the spatial and temporal trends in
rainfall over Sahibi Basin in Rajasthan State of India for a period of 57 years
(1961–2017). The results have shown a very high interannual variability in mean
annual rainfall, ranging from 217.33 mm in 2002 to 1214.96 mm in 1996, with a
mean annual value of 633.95 mm (SD ¼ 204.93, CV ¼ 32.33). However, no
significant increasing or declining trend was observed in mean annual rainfall over
Sahibi Basin during this 57-year period. Kotkasim and Tapukara stations have
shown substantial rising and declining trends, respectively. The monsoon season
contributes about 87% of mean annual rainfall. Pre-monsoon season rainfall has
shown a significant increasing trend; the winter season rainfall has shown an
insignificant increasing trend. Conversely, monsoon and post-monsoon season rainfall has shown insignificant decreasing trends. The months of July and August
account for approximately 63% of the total annual rainfall. However, these months
have shown nonsignificant declining trends. The month of June has shown a
significant increasing trend in the amount of rainfall over Sahibi Basin. Spatial
analysis has shown an increase in rainfall from the northeastern and western to
southeastward areas. This increase in rainfall toward the southeast may be attributed
to the existence of the Aravalli Mountains. The northeastern and western parts of the
basin have received less rainfall. The maximum mean amount of rainfall (about
708 mm) occurred over Thanagaji station in the south, whereas the least (about
575 mm) was seen over Tapukara station in the north. The observed spatial and
temporal variability in the amount of rainfall is high for such a small basin. From
these findings, it can be inferred that rainfall differs significantly during seasons and
months with great spatial and temporal variability. Finally, the results of this study
will be useful for management of water resources for future planning of irrigation
and agricultural practices over the semiarid Sahibi Basin.
References
Abeysingha NS, Singh M, Sehgal VK, Khanna M, Pathak M (2014) Analysis of rainfall and
temperature trends in Gomti River basin. J Agric Phys 14:56–66
Amoussou E, Awoye H, Totin Vodounon HS, Obahoundje S, Camberlin P, Diedhiou A,
Kouadio K, Mahé G, Houndénou C, Boko M (2020) Climate and extreme rainfall events in
the Mono River Basin (West Africa): investigating future changes with regional climate models.
Water 12:833
12 Trends and Pattern of Rainfall over Semiarid Sahibi Basin in Rajasthan, India
295