No abstract

No abstract

Flow is one of the hydrological variables of greatest interest due to its connection with water availability and its multiple uses. However, in recent years this resource has been threatened by intense land use and climate change, affecting patterns previously considered to be stationary. The goal of this study was to evaluate trends in changes of patterns of flow, precipitation, and land use in a basin located in the Brazilian Cerrado. 33 years of rainfall, fluviometric, and land use data were used, covering the period of 1985 to 2018 on an annual scale. Mann-Kendall and Sen Slope’s nonparametric test was applied to evaluate the trends in temporal series, as well as the Spearman Rho and Pettit, which were used to analyze the correlations between variables and detect the point of change in the series, respectively. The results show statistically significant trends in flow reduction over time. At the same time, a considerable reduction in natural areas occurred, with an increase of +750% in agricultural areas. The results also show that although a tendency to reduce precipitation was detected, its magnitude was not significant, with land use changes being the main factor for the negative changes in the flow of the Rio Grande tributary.

No abstract

No abstract

No abstract

The present study sought to evaluate the sensitivity of several ecologically relevant flow parameters to land use changes and climate change. The study was carried out in the Cachoeira River Basin located in the Atlantic Forest biome with predominately agricultural activities in its drainage area, in the state of Bahia, Brazil. To achieve the proposed objective, the Soil and Water Assessment Tool (SWAT) model was used to calibrate and validate the historical flow series from 1985 to 2015, create the simulation scenarios, and subsequently evaluate the hydrological changes in the different scenarios proposed through the 19 indices in the Indicators of Hydrologic Alteration (IHA) software. The results reveal that the maximum flows of 30 and 90 days, as well as the number of reversals, will be the most affected by future climate conditions. These significant changes indicate that the flows are mainly linked to changes in precipitation patterns in the basin. Thus, the negative medium and long-term trend of these flows can alter the availability of water in the basin and affect not only aquatic life but also the socio-economic development of the basin, with consequences for the water supply to cities and riverside populations that use its tributaries as a source of food, income, and leisure.

No abstract