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Trend Analysis of Hourly Rainfall Indices in Savitri River Basin, India
Adequate knowledge of the temporal variations of extreme rainfall events is key to modeling and forecasting extreme hydrologic events (e.g., floods) and for undertaking water-related emergency measures and management strategies. In this study, the temporal variations of extreme hourly rainfall events are examined using trend analysis on rainfall indices. The extreme indices are developed based on hourly monsoon (July to September) rainfall data (from 2000 to 2010) collected from five rain gauges in the Savitri River basin, Maharashtra, India. Commonly used Mann-Kendall and Sen’s slope tests are employed in this study to identify the trends. The indices are representing the total rainy hours, the maximum value of 1-h rainfall, and the hourly distribution of rainfall in a day. To obtain the hourly distribution in a day, a day is divided into six time periods, each with a length of four hours (early morning from 02:00 a.m. to 06:00 a.m., morning from 06:00 a.m. to 10:00 a.m., afternoon from 10:00 a.m. to 02:00 p.m., evening from 02:00 p.m. to 06:00 p.m., late evening from 06:00 p.m. to 10:00 p.m., and night from 10:00 p.m. to 02:00 a.m.). The hourly rainfall trend analysis shows that the total rainy hours and the maximum hourly rainfall show an increasing trend during July and September. The trend of rainfall occurring from early morning to night increases during September. However, during July, rainfall occurring from morning to night shows an increasing trend for most of the stations. But during August, the hourly rainfall occurring in a day is showing no clear pattern in the basin.
Trend Analysis of Hourly Rainfall Indices in Savitri River Basin, India
Adequate knowledge of the temporal variations of extreme rainfall events is key to modeling and forecasting extreme hydrologic events (e.g., floods) and for undertaking water-related emergency measures and management strategies. In this study, the temporal variations of extreme hourly rainfall events are examined using trend analysis on rainfall indices. The extreme indices are developed based on hourly monsoon (July to September) rainfall data (from 2000 to 2010) collected from five rain gauges in the Savitri River basin, Maharashtra, India. Commonly used Mann-Kendall and Sen’s slope tests are employed in this study to identify the trends. The indices are representing the total rainy hours, the maximum value of 1-h rainfall, and the hourly distribution of rainfall in a day. To obtain the hourly distribution in a day, a day is divided into six time periods, each with a length of four hours (early morning from 02:00 a.m. to 06:00 a.m., morning from 06:00 a.m. to 10:00 a.m., afternoon from 10:00 a.m. to 02:00 p.m., evening from 02:00 p.m. to 06:00 p.m., late evening from 06:00 p.m. to 10:00 p.m., and night from 10:00 p.m. to 02:00 a.m.). The hourly rainfall trend analysis shows that the total rainy hours and the maximum hourly rainfall show an increasing trend during July and September. The trend of rainfall occurring from early morning to night increases during September. However, during July, rainfall occurring from morning to night shows an increasing trend for most of the stations. But during August, the hourly rainfall occurring in a day is showing no clear pattern in the basin.
Trend Analysis of Hourly Rainfall Indices in Savitri River Basin, India
Lecture Notes in Civil Engineering
Timbadiya, P. V. (editor) / Singh, Vijay P. (editor) / Sharma, Priyank J. (editor) / Namitha, E. S. (author) / Jothiprakash, V. (author) / Sivakumar, Bellie (author)
International Conference on Hydraulics, Water Resources and Coastal Engineering ; 2021
2023-05-24
10 pages
Article/Chapter (Book)
Electronic Resource
English
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