Abstract
This study assessed the relationship between the recharge of the unconfined sedimentary Adamantina Aquifer and its discharge into the Batalha River in a small basin of 125 km2 that drains the municipalities of Bauru, Agudos and Piratininga (SP, Brazil). According to the Eckhardt Flow Separation Filters and Soil Moisture Accounting Procedure methods, the recharge was 312.6 mm/yr and 232.0 mm/yr, respectively; and 286.2 mm/yr to the modified-Thornthwaite method for the 2000-2018 period. Recharge values prone to converge as more extended periods are analyzed (ideally 18 years) because the sensitivities to a specific parameter tend to be mitigated over time. With the integration of the methods, we established how changes in land-use impact the aquifer recharge and, thus, the discharges and the behavior of the river's recession curve. Areas used to cultivate sugar cane (193 mm/yr), eucalyptus (150 mm/yr), or to urbanization (72 mm/yr) exert control over aquifer recharge even more than topography or type of soil. The combined and integrated use of three simple techniques allows them to be used for land-use planning and assessment of water availability in small hydrographic basins when hydrological data are scarce.
Highlights
With global climate change (GCC), the importance of water resources and their scarcity have been gaining prominence, especially in terms of availability and contamination
These three cartographies were georeferenced in the SIRGAS 2000 geographic coordinate system in ArcGis 10.5 and with the use of the intersect tool, a map was produced that aggregates the three attributes, with the categorization of 28 classes (Figure 3), which individually were the bases for determine the flow coefficients, in values of C = 0.1 to 0.4
This value was considered as the average recharge of the aquifer, which resulted in 386.2 mm/yr for the entire area, considering climatological values
Summary
With global climate change (GCC), the importance of water resources and their scarcity have been gaining prominence, especially in terms of availability and contamination. The subjects of groundwater and its relationship with surface waters are relatively de-emphasized. Groundwater is fundamental in the hydrological cycle for the maintenance and continuity of rivers and surface water bodies, feeding the base flow through the discharge of aquifers that is controlled by the aquifer recharge. These features depend on land-occupation characteristics, soil, geology, geomorphology, and climate in the recharge aquifer area. Understanding the aquifer recharge is essential to assess groundwater availability and combined resource planning for both surface and groundwater (Foster et al 2010, Hirata et al 2019)
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