Renato Moreira Hadad

Hydrographic and hydrogeological basin of Entre-Ribeiros: probable recharge zone delimitation and environmental impact assessment

The probable recharge zone delimitation of Entre-Ribeiros Basin (Northwest of the state of Minas Gerais / Brazil) is proposed in this study. The delimitation is based upon stratigraphy, geomorphology, geo-environmental domains and hydrogeology studies. Combining the recharge zone map with the land use variation between 1975 and 2008, the occupation trends of possible recharge zones are identified. Concluding, the environmental impacts for this basin are discussed.

Analysis of spatial–temporal patterns of water table change as a tool for conjunctive water management in the Upper Central Plain of the Chao Phraya River Basin, Thailand

A sustainable strategy for conjunctive water management must include information on the temporal and spatial availability of this natural resource. Because of water shortages in the dry seasons, farmers on the Upper Plain of the Chao Phraya River basin, Thailand, are increasingly using groundwater to meet their irrigation needs. To evaluate the possibilities of conjunctive water management in the area, the spatial–temporal changes in the water table of the Younger Terrace Aquifer were investigated. First, a regional geomorphological map based on field surveys, remote sensing and previous environmental studies was developed. Then, the well data were analyzed in relation to rainfall, streamflow, yield and pumpage, and the data were interpolated using geostatistical techniques. The results were analyzed via integrated zoning based on color theory as applied to multivariate visualization. The analysis results indicate areas that would be more suitable for groundwater extraction in a conjunctive management framework with regard to the natural hydrogeological processes and the effects of human interaction. The kriging results were compared with the geomorphological map, and the geomorphological areas exhibit distinct hydrogeological patterns. The western fans exhibit the best potential for the expansion of conjunctive use, whereas the borders of the northern fans exhibit the lowest potential.

Estimation of flow components by recursive filters: case study of Paracatu River Basin (SF-7), Brazil

The quantification of flow components is important for water resource management. The base, interflow, and runoff flows of nested basins of the Paracatu River (SF-7) were estimated with recursive signal filters in this study. At first, stationary analysis and multivariate gap filling were applied to the flow data. A methodology is presented, proposing filter calibration with the runoff influence and inflection of the recession curve for dry season. Filters are improved with a logic constraint that limits water flow overestimation within algorithm iteration. The results were coherent with previous studies and with hydrogeological and climatological maps.

Metodologia para diagnóstico rápido de áreas de recarga de aquíferos

The environmental tools of local appliance, such as surveillance and permits of deforestations and water use, environmental impact assessments of local scale, and delimitation of preservation areas, demand customized methodologies to deal with hydrogeological issues. In this study, a structured one for rapid environmental assessment aiming at recharge of aquifers safety was presented. This comprises qualitative and quantitative evaluations by means of textual and cartographical descriptions, complemented by weighted spreadsheets for rapid assessment. Applications in case studies took place in sites selected in the Paracatu River Basin. The results showed a positive potential for knowledge and protection of aquifers in micro-watersheds.

Estudos hidrológicos sobre a bacia de Entre-Ribeiros e avaliação do impacto do uso consuntivo de água para irrigação.

A water and land use research is realized on Entre‑Ribeiros sub‑basin, in Sao Francisco Basin, Minas Gerais, Brazil. The research is to investigate the agriculture irrigation environmental impacts. Regionalized and non‑regionalized hydrological studies are revised on water courses dynamic and water use. Using expert estimations based on local data, the Entre‑Ribeiros irrigation efficiency is evaluated: how much of water is demanded, how much is used in fact and how much is lost from the system. Following that, Entre‑Ribeiros irrigation data is associated with hydrological parameters and remote sensing agro‑economic zoning; this approach permitted to estimate qualitatively and quantitatively the irrigation front impacts on the water cycle and on the environment.

ADAPTAÇÕES METODOLÓGICAS INTER-ESCALARES DE ZONEAMENTOS AMBIENTAIS A BACIAS HIDROGRÁFICAS AGRÁRIAS DO SUDESTE BRASILEIRO

POLLINATOR FORAGING STRATEGY IN Galactia peduncularis (BENTH.) TAUB. (LEGUMINOSAE: PAPILIONOIDEA) IN THE PARQUE ESTADUAL DA SERRA DE CALDAS NOVAS BRAZIL The way the animals look for food is an important characteristic of their behavior. The optimal foraging theory is based on the existence of a balance between costs and benefits of these behavioral decisions. The present study aimed to evaluate the behavior of the pollinator in response to increased availability of floral resources. The experiment was conducted in a recently burned Cerrado area (Campo rupestre) in the State Park of Serra de Caldas Novas , located in the municipalities of Caldas Novas and Rio Quente Brazil. The species chosen to test our hypothesis was Galactia peduncularis (Benth.) Taub. (Leguminosae: Papilionoidea). 17 pairs of specimens were selected with a number of flowers, and the individuals of each pair were spaced by about 2m. In these pairs, one of them was considered the focal, and the other, the isolated. To test possible differences in pollination between isolated plants and focus, we performed two randomization tests: a test binary (TB), where all pairs were analyzed and verified the number of times where the focus on the individual floral visits were higher than the number of visits in isolated. According to the data analyzed, floral visitors preferred to use plants that could provide a greater amount of floral resources so that the number of visitors varied positively with the increment of flowers. Plants with many flowers can provide a greater amount of food in one location so that visitors do not need to flower around for long distances in search of meeting their energy needs.