| Over the past decade, land consolidation has played an important role in ensuring national food security, achieving dynamic balance of total arable land, improving land utilization and output rate, promoting large-scale land management, industrial agglomeration, concentration of living areas, improving agricultural production conditions and ecological environment in China. Land leveling is the key and difficult problem in design of land consolidation project. The investment of land leveling project always makes a significant part in the total investment, what's more, well-designed land leveling project makes it easy to design road, irrigation canals and ditches, reduce soil erosion, maintain soil fertility, and improve labor productivity and mechanical efficiency. However, with further progress in land consolidation, the new theory and technology are needed in land consolidation design to solve practical problems encountered in the work, save investments and improve efficiency.Based on the previous studies and the related theories, minimizing costs was set as a goal, then the factors of land formation cost was fully analyzed, finally the optimization model for land leveling design was proposed in the paper. The main contents of this paper are as follows. (1) The analytical framework of optimal design for land leveling project. The paper built up a systematic analytical framework from the creation of DEM, dimension design of field and earthwork calculation and transport. (2) The creation of DEM. According to the specification of engineering design, large scale DEM was created based on the theories of DEM creation and analyze; (3) Dimension design of field. The study area was divided into many regions and units by roads, irrigation canals and ditches, then a linear programming model of minimum earthwork, design elevation of cell field and balance of earthwork was established to solve the optimum solution. (4) The earthwork calculation and transport. The earthwork cost model was established to solve the optimization transport program. (5) The model and the methods were applied in Dongyang Project Land Consolidation in Jiangning County Nanjing city.After the theoretical and empirical research, the main conclusions are as followings:First. Optimal design for land leveling project contents creation the DEM model, dimension design of field, earthwork calculation and transportation et al. A systematic optimization model should be constructed based on the previous study, only in this way can we get a globe optimal solution.Second, it is entirely feasible to introduce DEM and LP to optimal design for land leveling project. A reasonable dimension design of field and transport route program were gotten by the LP model of dimension design of field and earthwork transportation networks model.Third, ArcGIS and Matlab software were applied in the model. Tthe advantages of establishing and analyzing DEM and the strength of modeling and solving were used. Empirical analysis demonstrated that the method achieved the target.Some suggestions are proposed to make improvement of the optimal design for land leveling project based on DEM and LP model. (1) More studies are needed in different areas and different land-shaped areas to improvement of the model; (2)With the development of high resolution remote sensing, high resolution remote sensing imagines should be used in establishing high resolution DEM; (3) Developing the application toolbar in GIS software by develop based on the model... |
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