Numerical simulation of the water movement and solutes in soil unsaturated / Simulação numérica do movimento de água e solutos em solos não saturados

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The interest in studying problems of underground drainage and solutos transport not in soils saturated it has been increasing significantly in the last years, mainly because of the growing concern with the quality of the soil and of the environment in general. Applied fertilizers in agricultural lands move below the zone radicular of the plants and they can contaminate underground water tables and aqüíferos. One of the most significant challenges of the current agriculture is the increase of the competitiveness associated to the preservation of the environment, allowing maintainable benefits in the agricultural explorations. The impact of pollutants in the quality of the underground water has been research object and of public health, especially in areas where she is to main source of drinking water. The mathematical models appear as useful tool in the prediction of as and when she should proceed the irrigation and the behavior of the solutos in solo.Devido to the complexity involved in these physical phenomena, it is used now beside the experimental work, the numeric simulation as forecast tool. The numeric simulation of the problem of infiltration of water and solutos in soil not saturated it is of great importance, because the growth of the agricultural production demands transformations with technological innovations that allow the improvement of the productivity of the cultures. To simulate the transport transiente of fertilizers, defensive, herbicidas and pollutant in an agricultural soil not saturated it is necessary the solution of two equations you not differentiate lineal. One of them is the equation of Richards, that governs the movement of water in the soil and, after your solution for a certain time, the results obtained for humidity, they are used for the solution of the other equation that treats of the transport of a certain soluto in matter. This work had for objective, to solve the proposed model of infiltration of water and soluto in the soil for the method of finite volumes, being used programming FORTRAN 90, to treat the case of the non linearidade of the movement of the water and a certain soluto not in soils saturated. Among the analyzed solutos, we used samples of abrasive mud coming of the sawmills and politrizes of the companies of marbles and granites of the municipal district of Cachoeiro of Itapemirim, where several rehearsals and analyses were accomplished, to feed the program and to evaluate the material in subject it is a pollutant in potential of the soil. The proposed method was shown appropriate to solve problems of infiltration of water and solutos transport not in soils saturated.

ASSUNTO(S)

numerical simulation solutes transport in soil convecção-difusão transporte de solutos em solo water dynamics in unsaturated soil convection-diffusion agronomia simulação numérica dinâmica de água em solo não saturado

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