Study On Application Of Solar Pressure Tank Rainwater Collection And Irrigation System Under Viaduct Bottom Greenbelt

With the increasing prominence of urban rainwater and flood problems in recent years,some domestic experts and scholars began to pay attention to solving this problem.Some excellent ideas and technical means abroad were also used for reference,such as LID technology in the United States,water-sensitive urban design in Australia and so on.We adopt different technical means and methods to solve the problem of rainwater and flood to different sites and environments.There are some installation systems for rainwater collection and reuse,which have some shortcomings to the viaduct.The solar pressure tank rainwater irrigation system studied in this paper can make up for the existing rainwater collection and irrigation.The shortcomings of the system.However,these theoretical advantages are not evaluated and measured by scientific means.At present,plant growth is only judged by human subjective experience.Therefore,we need some methods to evaluate whether it is helpful to the growth of plants.and how helpful it is.In this paper,we Take the Project of Long yang Road Viaduct in Pu dong New Area of Shanghai as an example,this paper evaluates the practical application effect of the solar pressure tank rainwater irrigation system from the aspects of plant growth,soil moisture content and economic value,and expects to find out the shortcomings of the system and provide theoretical methods and practical basis for such research.At the same time,some suggestions for the improvement of the plant landscape under the viaduct will be given based on the results of the system measurement behind the article,in order to achieve a better landscape effect for the plant greening under the viaduct.Through the on-site inspection and research of the project of Long yang Road viaduct,the summary results are as follows:(1)It can be seen that the growth of plants in the experimental group was obviously better than that in the control group,and the water content in the sample plots in the experimental group was higher than that in the control group from the measured results of plant height,ground diameter,WUE and soil moisture in the experimental and control groups from 2018.6 to 2019.5and the variance analysis of monthly data showed that the difference between the experimental group and the control group was significant.At the same time,it was found that the net growth of plant height and ground diameter of the tested plants in the experimental group and the control group had a certain regularity.The net growth of plant height increased rapidly in August and September,and reached its maximum in August.The net growth of ground diameter increased rapidly from July to September,and reached its maximum in August.The water content of the sample plot in the experimental group was higher than that in the control group,and the monthly data of variance analysis showed that the difference between the experimental group and the control group was significant,indicating that the solar pressure tank rainwater irrigation system had a significant effect on the growth of plants.At the same time,it was found that the net growth of plant height and ground diameter of the tested plants in the experimental group and the control group had a certain regularity.The net growth of plant height increased rapidly in August and September,and reached its maximum in August.The net growth of ground diameter increased rapidly from July to September,and reached its maximum in August.(2)By calculating the income of the rainwater collection and irrigation system of solar pressure tank according to the "Budget Quota for the Maintenance of Shanghai Landscape and Greening Project",it is concluded that the system can save about 6356 yuan per year compared with the traditional sprinkler with artificial irrigation.The input layer cost and cumulative income of solar pressure tank rainwater collection and irrigation system are combined with the mathematical model to analyze.The results show that the system can recover layer cost and start to benefit in 24 years.(3)The irrigation water requirement of plants from July 2018 to February 2019 was calculated by garden coefficient method,which was 4.19m3?4.34m3?2.71m3?1.27JN3?0.38 m 3?0.05m3?0 m3?0.11 m3?0.23 m3?0.30 m3,respectively,while the actual water flow through the water meter from July to February next year was 11 m3?22m3?8m3?5m3?3 m3?4m3?6m3?9m3?10m3?16 m3.By comparing the water requirement of plants with the water collected,a more suitable rainwater storage could be obtained.After calculation,the optimized tank volume is equal to the original tank volume(8 m3),which proves that the design capacity of the system itself is reasonable.In this way,not only can the rainwater collected be fully utilized,but also the annual revenue of the system increased frrom 6356 yuan to 32609 yuan.The period of time for the system to recover layer capital and gain benefits was also shortened from 24 years to 5 years.