ABSTRACT

The Corumbataí River basin (São Paulo, Brazil) has a critical situation regarding water availability due to the intensive use to support agriculture and urbanization, requiring scientific information to face water demand. The aim of this study is to present a hydrological characterization based on the analysis of seasonal isotope variations (rainfall, groundwater, and surface water) and hydrometric data. Results indicate that baseflow contribution varies from 50 % to 70 % of the total flow, and water isotopic composition denotes a seasonal regime marked by the mixing of surface and groundwater in the wet period and groundwater discharge during the dry season. The results presented indicated the strong seasonal connection between atmospheric inputs and water movement across the basin, which poses an urgent need to diversify monitoring methods and create feasible regional and political regulations to control the effects on basin water resilience in the face of climate change and growing demand.

摘要

Corumbataí流域（巴西圣保罗）由于需要大量使用以支持农业和城市化，因此在水的可利用性方面存在严重问题，需要科学的信息来应对水的需求。本研究的目的是基于季节性同位素变化（降雨，地下水和地表水）和水文数据的分析，提出水文特征。结果表明，基础流量的贡献在总流量的50％到70％之间变化，并且水同位素组成表示一个季节性方案，其特征是在湿润时期地表水和地下水混合，而在干燥季节则是地下水排放。提出的结果表明，大气输入与整个流域的水运动之间存在强烈的季节性联系，