Mapping water table depths of Bauru aquifer system (BAS) in a enviromental protection area at Águas de Santa Barbara/SP - Brazil during the 2014/2015 hydological year

Author(s)

Lucas Vituri Santarosa

• Document type: Master's Dissertation
• Press: Botucatu. 2016-09-12.
• Institution: Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agronômicas. Botucatu
• Defense date: 2016-08-10
• Advisor: Rodrigo Lilla Manzione

Abstract

The spatial statistics applied to data collection, analysis and interpretation of spatial phenomena has become essential for management of water resources, requiring accurate mathematical models and the ability to determine the uncertainties. Therefore, geostatistics presented as an important tool for data analysis aimed at monitoring of aquifer collected in geospatial networks, reducing the effects related at data collection and merging physical sense in the analyses. This study explored the use of geostatistics in mapping the dynamic of Bauru Aquifer System (BAS), comparing interpolators as kriging and cokriging in anisotopic sampling conditions. Were used as auxiliary variables the physical and hydraulic of the soil and the topography for the mapping of water table deep of the hydrological year 2014/2015 and 2015/2016 onwards of 48 monitoring wells located in the Ecological Station of Santa Barbara (EEcSB) domain, in Águas de Santa Barbara, Sao Paulo, Brazil. The objectives were to verify the fluctuations of water table in an area the BAS, estimate the recovered water volumes and gather information for the formulation of the Hydrological Conceptual Model (HCM). The results showed that the using of the auxiliary variables, mainly topographic data and soil resistance penetration, are able to improve the spatial predictions, with notable reductions at sampling variance and decreasing errors in the predictions. The water volumes recovered calculated from the water table maps allowed to infer about the ability of the use at areas as the EEcSB for the groundwater storage in short term, able to supply the regional demand in periods of scarcity. With the forecast of 30% uptake of the water volume recovered in EEcSB estimated to supply the population of the municipalities of Manduri, Cerqueira Cesar and Águas de Santa Barbara for approximately three months. With the collected environmental data allowed, the design of a HCM was formulated from the dynamics estimates of groundwater. The results are important supporting groundwater management with strategic information for sustainable use of aquifers. (AU)

• FAPESP's process: 15/05171-3 - Mapping water table depths of Bauru Aquifer System (BAS) in a environmental protection area at Águas de Santa Barbara/SP - Brazil during the 2014/2015 hydological year
• Grantee: Lucas Vituri Santarosa
• Support Opportunities: Scholarships in Brazil - Master