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Development of micro level grid data of rainfall and temperature in Odisha over different time scale

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2018-06
Singh, K.K
OUAT,Bhubaneswar
129
Development of micro level grid data of rainfall
M.Sc

Climate change has been the global phenomenon affecting the mankind. The ill effect of climate change necessitated the research and development in various aspects of global climate change. The present study is an attempt to prepare a grid data at the micro level (block level) to supplement the agrometeorological research and development. However, very few studies have been made on a microscale (block level) for the states in general and Odisha in particular. Hence, the present study was carried out to determine the trend of the extreme rainfall events during 1994-2017. The study was carried out with different interpolation techniques such as Inverse Distance Weightage (IDW) for rainfall and temperature analysis, Kriging for rainfall and Spline for temperature using geographical information system (GIS) technology to create micro level gridded datasets from the point data. The analysis exhibited that IDW technique is best for rainfall and Spline technique gives good result for temperature. The analysis revealed that the southern region (Malkanagiri, Koraput, Raygada, Nabrangpur and Kalahandi) of the state receives maximum rainfall during the monsoonal months as compared to other regions of the state. In case of temperature, the western region (Jharsuguda, Sambalpur, Deogarh, Baragarh, Sonepur, Bolangir, Nuapada) of the Odisha appears to have high Tmax values as compared to the rest part of the state. Block level daily rainfall data were used in identifying the extreme rainfall events while district-level aggregation was used in per cent extreme events and frequency of extreme events per year in three categories viz; Heavy (64.5-124.5 mm per day rainfall), Very Heavy (124.5- 224.5 mm per day rainfall) and Extremely Heavy rainfall (≥244.5 mm per day rainfall) as per the criteria given by IMD. The state on an average received one extremely heavy rainfall, eight very heavy rainfall and forty heavy rainfall events in a year. Maximum percentage of extremely heavy rainfall occurred in Sambalpur (5.95 %), very heavy rainfall in Puri (22.86 %) and heavy rainfall in Sundergarh (84.66 %). A record of one-day rainfall event clearly indicated that Thuamal Rampur block of Kalahandi district experienced extremely heavy rainfall (700 mm) on 3rd June 2006.

Th 5100

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