Sand Mining Pool Eutrophication (Vale do Paraíba, São Paulo, Brazil): Preliminary Assessment

2. FACULDADE DE ENGENHARIAS ARQUITETURA E URBANISMO 213m 559 558,80 558 559,50 557, 50 560 557 557,60 557,20 564 561,60 • Sand Mining Pool Eutrophication (Vale do Paraíba, São Paulo, Brazil): Preliminary Assessment • M.R. Aquino-Silva (1), P.R. C. Leone (2), E.J.B.Bastos (1) • Instituto de Pesquisa e Desenvolvimento, Univap, Shishima Hifumi Av., 2911 - São José dos Campos, SP, Brazil • Faculdade de Engenharias, Arquitetura e Urbanismo, Univap, Shishima Hifumi Av., 2911São José dos Campos, SP, Brazil • (+55) 12 39471101 – mregina@univap.br; prcleone@gmail.com; ebbastos@univap.br Introduction The historical process of land occupation has been considered a predatory nature that resulted in the destruction of much of the original vegetation of most regions in the state of Sao Paulo and Brazil [1]. The extraction of sand although necessary, move the regional economy and it is very important for growth in relation to the needs of construction inputs, is an extremely degrading as regards the change of landscape quality, soil formation and exposure of the groundwater. After the extraction, the region inherits immense excavations flooded with little or no biodiversity. The water founded inside may suffer process of eutrophication. This process occurs mainly by enrichment of water with nutrients, which include the nitrogen and phosphorus. The aim of this study is to identify the main parameters that determine the eutrophication of sand mining pool and propose actions to minimize this process. Methods Topographic maps - Drainage area Climatological water balance Water analyzes: pH, dissolved oxygen temperature, nitrite and phosphate Soil analyzes: pH, M.O., phosphate and potassium Check the drag of organic matter by surface runoff São José dos Campos and Jacarei (SP-Brazil) (S 23° 12" 54' e W 45° 57" 47') - Sand mining pool area - General view The water samples collection points The soil samples collection points Results Changes in concentrations of dissolved oxygen and nitrite in the collection points Changes in concentrations of phosphate and nitrite in the collection points Amostras de solo Topographic map indicating the flow of runoff Variation of soil chemical parameters in the two sampling points Relationship between rainfall (P), water stored in soil (S) and runoff (Esc) Final Considerations Water availability in the soil for much of the year (6 months) combined with planaltimetric letter indicates that the area of reforestation is a unit ecologic with potential instability seen between low to moderate. Thus, some basic precautions to protect the soil, with efficient management of vegetation are essential to not worsening the current conditions of the area as the exposure to extensive erosion. The water analysis indicated that the floodplain area has a strong influence in the process of eutrophication through the subsurface infiltration of water retained in this area toward the pit of sand. The main factors contributing to the lowland area is rich in nutrients are runoff and use the area for grazing References [1] Hahn, C. M., Silva, A. N.; Oliveira, C.; Amaral, E. M.; Soares, P. V.; Manara, M. Recuperação Florestal: da muda a floresta. Fundação Florestal, 112p., 2004. Supported by: Fundação Valeparaibana de Ensino