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Tamil Nadu Agricultural University (2012)

Drought characterization impact assessment and management strategies for koppal district in north eastern karnataka

Neelakanth J.K.

Titre : Drought characterization impact assessment and management strategies for koppal district in north eastern karnataka

Auteur : Neelakanth J.K.

Université de soutenance : Tamil Nadu Agricultural University

Grade : Doctor of Philosophy (PhD) in Soil and Water Conservation Engineering 2012

Résumé
The identification, monitoring and characterization of drought is of great importance in tackling the same inter alia by proper water resources management for agricultural planning of crops. Under the present investigation, Koppal district in North Eastern dry zone of Karnataka, which lies in between 15o ¶ and 160 34¶ N latitudes and 750 46¶ and 770 35¶ E longitudes, is one of the districts frequently affected by drought was taken up for the study. To investigate the temporal and spatial drought occurrence, the India Meteorological Department (IMD) method and the Standardised Precipitation Index (SPI) method were analysed from probability distribution of rainfall for Koppal district. The Koppal district consists of four taluks namely, Koppal, Kustagi, Yelburga and Gangavathi. Rainfall data of all the rain gauge stations under these 4 taluks of the study area were collected from IMD, Bangalore and used for the study to assess the drought situation and frequency of drought. The study zone consists of red loam, sandy loam, clay loam and clay soils. The values of mean and standard deviation of annual rainfall for Koppal, Kustagi, Yelburga and Gangavati taluks were 634, 567, 568 and 622 mm and 197.5, 180.7, 161.6 and 207 mm respectively. The rainfall received during the south-west monsoon was observed to be about 80 per cent of the annual rainfall with August and September as the rainiest months. The variation in the rainfall from year to year was found to be well pronounced. The 33-years (1978-2010) rainfall of all the four taluks of Koppal district were analysed using log-Pearson, log-normal, Gumbel, Foster type-I and Weibull distributions. The analysis revealed that the Gumbel distribution was the best-fit distribution with minimum variance among the various probability distribution functions considered. The second and third best-fit distributions were Foster type-I and log normal distributions for all the taluks. The Gumbel distribution estimated the probable annual maximum rainfall of 1203.7, 1272.1, 1129.8 and 1332.7 mm for 100-year return period followed by 1093.8, 1138.1, 1032.3 and 1208.9 mm for 50-year return period, 983.2, 1004.1, 934 and 1084.2 mm for 25-year return period, 834, 1004.1, 801.5 and 916.1 mm for 10-year return period, 716.0, 692.8, 696.7 and 783.1 mm for 5 year return period for Koppal, Kushtagi, Yelburga and Gangavathi taluks, respectively. The most probable annual rainfall magnitudes of 537.7, 515.6, 538.3 and 582.1 mm corresponding to 2-year return period were estimated to be the frequent rainfall values in these taluks, respectively.

Présentation et version intégrale (Shodhganga)

Page publiée le 18 avril 2021