CUNHA, R. G. L.; http://lattes.cnpq.br/4976813984963276; CUNHA, Raimundo Glauber Lima.
Resumo:
In this work, the optimal operational releases from Engenheiro Arcoverde
reservoir and the pumping of water from the downstream amazon type of wells and the
selection of the areas of irrigated crops, located in the neighborhood of the Condado
town, within a semi-arid region of the Paraiba state, are studied in order to maximize the
net profit. The main scope of this work is to provide the engineer with a methodology
and tool to design and plan more efficient uses of water within a (semiarid region)
(region with scarcity of water).
A linear programming method developed by Curi and Curi, 1998, was used
herein to achieve an optimal solution for the problem. The natural nonlinearities of the
problem are also considered in a recursive way. The linear equality and inequality
constraints are characterized by the physical and crops' phenological behavior and
limitations, socio-economical and legal requirements and the guarantee of the
sustainability of the system within a time period. The decision variables are the
irrigated crop areas and the monthly water volume released from the reservoir and
pumped from the downstream amazon type of wells used for each type of irrigated crop.
The objective function is the net profit attained from each irrigated crop production,
selling prices and managerial costs.
Several scenarios, which were characterized by a set of selected five-year hydroclimatic
time series data gathered from a 2 0 years time period and defined as medium,
normal, dry and wet seasons, were considered. It is also compared the proposed
solution of the model with an experienced situation, for the same hydro-climatic
conditions, during the years of 1996 and 1997 The attained results for the decision
variables as well as the optimal operational policies for the reservoir releases are
dependent upon the hydro-climatic scenarios and the reservoir initial and final required
storage conditions. Besides running the program for several scenarios and providing the
sensitivity analysis with respect to several parameters, it has also been shown, when
comparing the attained results with a real world situation, that the net profit can be
improved if appropriate managerial decisions are taken. It has also been shown that it is
possible to determine, with the proposed model, optimal monthly reservoir storages, for
some proposed scenario, that maximizes the net profit while it is guaranteed the
sustainability of the system.