Optimization Scheme Of Low Pressure Trickle System And Study On Irrigation Uniformity

Drip irrigation has many strong points, such as timely and adequate irrigation water, conserving water and energy. It is an effective measure of water-saving irrigation. And many experts devote their time to the study on drip irrigation. This article is focused on the effect of field measures on the price and quality of drip irrigation system and exactly determining the quantity of irrigation water. The length of drip line is an important parameter of optimum design. It has direct effect on the price and quality of trickle system. Traditionally, the cost of drip system diminishes as the length of drip line increases. When the area of little irrigation district is constant, drip line of trickle irrigation has the optimizing length. If the length of drip line is longer or shorter than the optimizing length, the expense of trickle system increases. Goal function is to minimize the expense of trickle system; the difference in pressure of drip line is thought as restriction condition; we may obtain optimizing length of drip line by answering to the goal function. In a short, answer to the optimizing length of porous pipe is very important in optimum design of trickle system.Trickle irrigation is regarded as a significant technology of water -saving irrigation, because we can exactly control the quantity of irrigation water, decreasing ground evaporation and deep-seated leak. Then, how should we determine the average amount of dripper in little irrigation district? An operational measure is to make average pressure position of drip line certain and determine the flux of emitters in average pressure position. Average pressure position of drip line is determined by programming on conditions that the distance of emitter, the styles of emitter the diameter of drip line and the length of drip line vary within probable range. The outcome shows that the ratio of the distance of average pressure position from the entrance to water of drip line to the length of drip line varies from 0.3 to 0.4. Therefore, we can exactly gain the average flux of emitters in little irrigation district by determining the average flux of emitters in these positions instead of determining all emitters within little irrigation district. This can conserve lots of labor.Irrigation uniformity is used as weighing the quality of drip system. Many factors have effect on irrigation uniformity. With the growing of pressure, how is irrigation uniformity of trickle irrigation varying on different condition of the diameter of drip line, the distance of emitters, the length of drip line, the style of emitters, the flux ratio of emitters and the face gradient of little irrigation district. The consequence shows that pressure has puny effect on irrigation uniformity. On the contrary, the length of drip line, the diameter of drip line, the distance of emitters and the face gradient of little irrigationdistrict have remarkable effect on irrigation uniformity. When other factors are unchangeable, with the growing of the diameter of drip line and the distance of emitters, irrigation uniformity of trickle system is increasing. The face gradient of little irrigation district has complex effect on irrigation uniformity. In a word, we tries our best to make the face of little irrigation district flat in order to improve the quality of drip-irrigation system.Low pressure trickle irrigation is based on the little effect of pressure on the quality of drip irrigation system. Low pressure trickle irrigation is popular with farmers. Currently, the study direction of drip system is to develop low pressure emitters.