Research On Field-project Typical Layout Model Of Jiangsu Province

Our country is a large agricultural nation, and the construction of water conservancy plays a critical role in the development of agriculture. The contents of farmland basic construction are very rich, such as land leveling project, the field regulation, and gradually change the backward irrigation methods and irrigation technology etc. As the field-project is the most basic project, which directly relates to the effective control of farmland irrigation, drainage, drop. At present, in our country, most of the backbone of irrigation and drainage system is sound, but relatively, the field-project is lags behind, the matching rate of field-buildings is low and not in good condition, which directly affecting the whole irrigation efficiency. Therefore, in order to follow the agricultural mechanization and water conservancy modernization, carry out the research of field-project layout model, and provide technical support for development of efficient and ecological agriculture, which have important practical significance and application prospect.This paper is based on the difference of main topography and geology in Jiangsu province, divided into five different types:Huaibei plain, Lixiahe area, Taihu lake rice-soil area, coastal area, high sandy soil areas along the river. Analysing the present layout mode of field-project, and we research the reasonable layout mode of field-project, in order to adapt different regions in our province. The main contents include:(1) According to the soil texture, crop types, groundwater depth requirements of different regions, determine the depth of the last stage of the drainage ditch of different regions, then establish the model about the spacing-calculation of the last stage of the drainage ditch, using Visual Basic6.0to design calculation interface, adopting Genetic Algorithm to program and calculate, finally, obtain appropriate spacing of the drainage ditch of different regions.(2) On the basis of summing up the layout mode of field-project in different areas of Jiangsu Province, combined with the results of the depth and spacing of last stage of drainage ditch, amend the original layout mode of field-project on the basis of the existing stereotyped of large and medium-sized ditch. At the same time, count the earthwork and the types and numbers of the field-buildings, to estimate the fixed quota in6.67square kilometers.(3) Builds up the model about the spacing-calculation of Subsurface drainage pipe, adopting Genetic Algorithm to program and calculate, then combined with the results to study the traditional farmland irrigation and drainage mode with "two kinds of closed conduits and one kind of open ditches", and the mode with "two kinds of closed conduits and one kind of open ditches"determined by the agricultural machinery efficiency,separately. Another, estimate the number of field-buildings and earthwork in6.67square kilometers about these two kinds of mode.(4) Analysis these three kinds of different layout mode in aspects of investment costs, project benefits, earthwork, construction methods, management and maintenance, and evaluate comprehensively, to provide the reference when choose the appropriate mode according to their local natural and economic conditions for different regions.