Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810102832
Authors: UMA BAI, D
Advisor: SAROJINI DEVI, B
Title: ASSESSMENT OF HYDROMETEOROLOGICAL DROUGHT EFFECTS ON GROUNDWATER RESOURCES IN ANANTAPURAMU DISTRICT
Publisher: Acharya N.G. Ranga Agricultural University
Language: en_US
Type: Thesis
Pages: 199
Agrotags: null
Keywords: HYDROMETEOROLOGICAL, DROUGHT EFFECTS, GROUNDWATER, ANANTAPURAMU DISTRICT
Abstract: Drought is a disastrous natural phenomenon that has significant impact on social, economical, agricultural and environmental spheres. Drought is one of the world’s costliest natural disasters, causing an average 400-500 billion rupees in global damages annually and affecting more people than any other form of natural catastrophe. India is the seventh largest and second most populous country in the world. Its area is 2.2 per cent of the total world geographical area and about 16 per cent of the entire human race resides in its fold. The present study was motivated by the fact that no such study related to ground water resources was reported in Andhra Pradesh in general and Rayalaseema districts in particular Anantapuramu district prone to experience chronic drought conditions regularly. The present Post Graduate Research entitled “Assessment of hydro-meteorological drought effects on groundwater resources in Anantapuramu district” is proposed to i) to analyze the rainfall and groundwater levels data of the study area. ii) to calculate the drought indices such as Deciles, SPI (Standardized Precipitation Index), GRI (Groundwater Resource Index) SDI (Stream flow drought index) and SRI (Standardized Runoff Index) for the study area and iii) to suggest suitable drought mitigation measures for the study area. Details of meteorological parameters were collected from the chief planning department and analyzed, hydrological parameters which were analyzed from the data collected from Ground water Department, Anantapuramu. The total geographical area of the Anantapuramu district is 19,197sq.kms.There was a wide variation in rainfall in Anantapuramu district both spatially and temporally. The weighted mean rainfall (1988-2017) in Anantapuramu district is 542.2 mm. The highest rainfall was recorded during the year 1996 (793.01mm) followed by the year 2006 (782.96 mm).The lowest rainfall was recorded during the year 2016 (334.4 mm) followed by the year 2003 (370.71 mm) indicating the drought severity in the district. The water table level (2001-2017) in the study area fluctuated between 14.73-19.77 m. The groundwater level was found to be deepest during the months of August and September (19.77 and 19.53 m) respectively, and the water table level was shallowest during the months of December and January (14.73 and 14.83 m) respectively. Based on the research work carried out, the major conclusions drawn are Deciles were computed for the long historical rainfall data of 30 years over Anantapuramu district and historical drought events were identified which fall under the deciles 1-2 and 3-4. It is evident from the results that there were 12 drought events (1990, 1992, 1994, 1995, 1997, 2002, 2003, 2004, 2006, 2011, 2014 and 2016) in the period 1988-2017. The analysis of SPI-1 month showed that severe drought occurred in two mandals, moderate drought occurred in 15 mandals and 46 mild droughts. The analysis of SPI-6 month showed that 27 mandals had extreme drought conditions, 33 mandals had severe drought conditions and 3 mandals had moderate drought conditions. The analysis of SPI-12 month showed that 37 extreme, 20 severe, 4 moderate drought conditions in Anantapuramu district. The analysis of GRI-1 showed that 17 mandals had extreme groundwater drought situations, 18 mandals had severe water scarcity, 10 mandals had moderate and 2 mandals had mild groundwater drought. The analysis of GRI-6 showed that 25 mandals had extreme groundwater drought, 23 mandals had severe groundwater drought, 9 mandals had moderate groundwater drought problem. The analysis of GRI- 12 month showed that 15 mandals had extreme groundwater drought situations, 18 mandals had severe groundwater drought situations, 12 mandals had moderate groundwater drought, 2 mandals had mild groundwater drought. The variation of Standardized runoff index values for the period 1988-2017. High magnitude of drought was observed in the year 2005 with Standardized runoff index value -2.12. During the drought years Standardized runoff index varies from - 2.12 in the year 2005 to -0.32 in the year 1997. Most of the year’s fall in the range of mild drought. The drought characteristics based on the SPI-12-month, which indicates long-term drought (particularly for the groundwater scenario in the region). It is interesting to note that the number of drought events has decreased substantially, but the duration and severity have increased. Drought impacts can be minimised through developing suitable drought mitigation strategies. Mitigation actions can be taken before or at the beginning of drought. Therefore, early warning systems need to be developed for the region based on the real-time monitoring of indicators based on rainfall, soil moisture, surface water, and groundwater, so as to make the region drought-proof and improve the sustainability of agriculture in Anantapuramu district.
Description: D5742
Subject: Agricultural Engineering
Theme: ASSESSMENT OF HYDROMETEOROLOGICAL DROUGHT EFFECTS ON GROUNDWATER RESOURCES IN ANANTAPURAMU DISTRICT
Research Problem: ASSESSMENT OF HYDROMETEOROLOGICAL DROUGHT EFFECTS ON GROUNDWATER RESOURCES IN ANANTAPURAMU DISTRICT
These Type: M.Tech.
Issue Date: 2018
Appears in Collections:Thesis

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