Application Research On Water Saving Reconstruction Technology Of Pipeline Water Conveyance Irrigation In The Hilly Area Of Suqian

The level of agricultural production development in the hilly area of Suqian City has not been high,mainly affected by natural and economic aspects.In recent years,Suqian has been focusing on supporting small irrigation projects and water-saving transformation,promoting water-saving irrigation in accordance with local conditions,and striving to implement the policy of "giving priority to water saving" to increase agricultural production and farmers’incomes.Aiming at the main problems of the irrigation system in the hilly area of Suqian City,this paper conducts investigation and simulation analysis to carry out the water-saving reconstruction of pipeline water conveyance irrigation in the hilly area.The research results provide technical guidance for the pipelined water-saving reconstruction of the irrigation area in the area.The main findings are as follows:(1)The thesis constructs an appraisal index system for the suitability of water-savingreconstruction of the pipe water conveyance and irrigation engineering in the hilly area of Suqian from four aspects,including technical application conditions,engineering and technical support,social and economic support,and project construction effectiveness.A comprehensive evaluation method combining qualitative and quantitative is proposed,and the rationality of the evaluation method is verified by empirical analysis.According to the development conditions at different stages and the changes in the influencing factors of construction,the potential of water-saving transformation of the pipeline water transfer irrigation engineering technology in this area was further analyzed.(2)The paper summarizes the irrigation characteristics of different terrains and crop areas,and puts forward the technical scheme of the pipelined water-saving reconstruction suitable for the irrigation system in this area,which is reservoir pressure and water extraction as the main water source engineering.Finally,a set of supporting pipeline engineering projects including water intake project,water distribution project,and field project were completed(3)The paper constructs the system engineering investment,operation,and economic benefit functions.With the objective of achieving the best economic results,it proposes the appropriate scale for the water-saving reconstruction of the arterial irrigation and flushing irrigation in the hilly area of Suqian.The results show that the irrigation water supply volume of the reservoir is between 3 and 4 million m3,and the econolical effect of pipeline reconstruction of agricultural canals and below is the best.The irrigation water supply volume of the reservoir is between 2 and 3 million m3,and the economical effect of pipeline reconstruction of the ditch and below is the best.The irrigation water supply volume of the reservoir is between 1 and 2 million m3,and the economical effect of the full pipeline transformation is the best.For the irrigation system of the water-lifting pipeline in the hilly fields,the economic effect is best when the single station control scale of the pipeline reconstruction is 300～400 mu.(4)The dissertation sets up a high-level pool regulation system to meet the requirements of water pressure stability and water balance for pipelines in hilly land.According to the objective of establishing the minimum annual cost of the system,an optimal configuration scheme for the combined water supply system of the pumping station and the storage tank was proposed.By analyzing the main factors affecting the lift irrigation head and investigating the irrigation payment capacity of local users,the paper puts forward the economic lift of the lift pump station in the hilly area of Suqian city under the background of the transformation of water conservation by pipeline.Combined with the optimal design scheme of the regulating storage system,the relationship diagram of the economic layout of the regulating storage tank under different irrigation areas was drawn.Finally,the annual cost function model of the irrigation network investment was established,and the economic flow velocity of the pipeline for the water distribution irrigation network in Suqian area was proposed by using the dynamic programming method.