| Object: The Zuncun Yellow River Diversion Irrigation Area is one of the large and medium-sized irrigation areas in the Yellow River Basin.The main canal starts from Zuncun,Yongji City,Yuncheng City,Shanxi Province.The area is about 30,000 hectares.As the largest passenger water resource in the irrigation area,the Yellow River water plays an important role in irrigation.Because the Yellow River water contains certain nutrients,the commercial crops such as grapes in the irrigation area are generally irrigated by the combination of the Yellow River water surface irrigation and the groundwater drip irrigation.However,the situation of groundwater overexploitation in my country is severe.The development of the Yellow River drip irrigation can effectively relieve the pressure of groundwater water use,promote the efficient utilization of the Yellow River water resources,reduce the use of groundwater,improve the water use structure,and provide theoretical support for the development of the Yellow River drip irrigation.Methods: A typical plot in the Zuncun Irrigation District was selected,and three-year-old Krensheng grapes were used as the economic crops for the field experiment.The water quality was used as the entry point of the experiment.Two irrigation water sources,the Yellow River water and groundwater,were set up,and the groundwater was the control water source.The field irrigation system adopts the drip irrigation system of yellow diversion and anti-clogging,and adopts the non-pressure compensation inlaid patch drip irrigation belt.The field experiment was divided into three plots,namely,Yellow River water drip irrigation,Yellow River water drip irrigation + weed-proof cloth treatment,and groundwater drip irrigation treatment.Five grapes were selected for each treatment as repeated experiments,and the length of new shoots and stem thickness of grapes were regularly monitored.To change the situation,the expansion rate of the transverse and longitudinal diameters of the berries was monitored every 10 days during the fruit expansion period,and after the grapes were ripe,fresh grapes were picked for yield and quality measurements.Four different types of drip irrigation belts were set up in the field drip irrigation anti-clogging test.During each irrigation period,water samples from the emitter were taken from three positions in the front,middle and rear of the drip irrigation belt,and three replicates were set for each position.Flow attenuation rate,sediment discharge rate,and irrigation uniformity coefficient under yellow conditions.The object of the irrigation device simulation test is the irrigation device of the drip irrigation belt used in the field drip irrigation.The modeling and design of the irrigation channel of the irrigation device is carried out by using Solid Works and CAD drawing software.,The simulation parameters are set based on the actual engineering conditions of field drip irrigation,and at the same time,it is used as a verification test of the simulation simulation to reveal the blockage mechanism of the irrigation channel of the drip irrigation system in the field,and systematically reveal the operation mechanism of the anti-clogging drip irrigation system in the field for the diversion of the Yellow River.The application and popularization of drip irrigation provides scientific basis and theoretical guidance.Results:1.Water quality can significantly affect the growth and development of Crimson grapes,the appearance quality of berries and the content of fruit nutrients;the use of Yellow River water drip irrigation during the whole growth period of grapes can promote the growth and development of new shoots;Compared with groundwater drip irrigation,Yellow River water drip irrigation can Compared with groundwater drip irrigation,the content of soluble solids and soluble sugar in grape berries increased by 4.32% and 5.76%respectively,and the content of titratable acid decreased by 0.12%.2.Under the condition of drip irrigation from the Yellow River,the actual flow rate of the first irrigation was lower than the design flow rate,among which the best performance was FE4,and the actual flow rate of the first irrigation was 93% of the design flow rate.During the test period,the average flow rate of the irrigator decreased gradually with the increase of the number of irrigations,indicating that the sediment inside the irrigator gradually deposited and the clogging degree of the irrigator continued to deepen.At the end of the test,the flow rates of the emitters were 59%,65%,69%,and 66% of the initial flow,respectively;during the experiment,the irrigation uniformity coefficient of the emitters was in a state of fluctuation,and the overall fluctuation range was above 95%.Different parts of the same drip irrigation belt There are differences in the irrigation uniformity coefficients of the irrigators.Overall,the irrigation uniformity coefficient of the front irrigators of the drip irrigation belt is higher,and the irrigation uniformity coefficient of the middle and rear irrigators has a wide fluctuation range and poor stability;the average relative flow of the irrigators varies with the increase of irrigation times gradually decreased,and the average relative flow decreased with different types of emitters.There were also obvious differences in the decrease of the average relative flow;the sediment content of the effluent from the emitter was the highest during the first irrigation of the drip irrigation system,and then gradually decreased.With the increase of the number of times,there is a certain degree of fluctuation in the sediment content of the irrigator;the silence of the sediment in the irrigator mainly occurs in the water storage tank and the end flow channel connecting the water storage tank,and is mainly concentrated in the chamfering and variable ratio of the water storage tank.part.3.The pressure of the fluid domain inside the irrigator decreases linearly with the flow channel unit,and the pressure drop gradient is linearly related to the number of flow channel units;the fluid in the main flow area is updated quickly,the sediment is not easy to deposit,and the vortex area of the flow channel and the chamfered part of the water storage tank are The main part of sediment deposition;other areas other than the high-speed area of the flow channel and the overall turbulent kinetic energy of the water storage tank are low,and the water flow cannot form or maintain a turbulent state,which is not conducive to the migration of sediment,resulting in blockage.Conclusion:1.The anti-clogging drip irrigation system of the Yellow River Diversion has a significant effect in the actual engineering application of the field,and the anti-clogging effect is obvious,which can significantly prolong the service life of the drip irrigation system in the Yellow River Diversion Irrigation Area.The Kelunsheng grapes irrigated by the Yellow River water drip irrigation have obvious advantages in the shoot growth period and the berry expansion period,and their yield and quality are better than the groundwater drip irrigation treatment.2.Under the conditions of the Yellow River Drip Irrigation Test,the FE4 has the best performance in terms of the discharge flow of the irrigation device.The actual flow rate of the first irrigation is 93% of the design flow rate,the irrigation uniformity coefficient is generally above 95%,and the irrigation stability is strong.At the end of the test The average relative flow rate is 66%,which only reaches the general blockage level,and the sediment discharge capacity is stable.3.The analysis of the flow velocity,turbulent kinetic energy and streamline of the internal structure of the irrigator shows that the low-velocity region of the irrigator flow channel and the chamfer and side wall of the water storage tank are the main parts of sediment particle deposition. |
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