| Cite this article: | 王志强,黄思宇,张清涛,等.蓄雨屋顶超纤渗灌系统土壤含水率分布特征[J].灌溉排水学报,0,():-. |
| Wang Zhiqiang,HUANG Si-yu,ZHANG Qin-tao,et al.蓄雨屋顶超纤渗灌系统土壤含水率分布特征[J].灌溉排水学报,0,():-. |
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Wang Zhiqiang1, HUANG Si-yu2, ZHANG Qin-tao3, PAN Chang-jiang2
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1.School of Civil Engineering, Sun Yat-Sen University;2.SUN YET-SEN university;3.school of Civil Engineering,Sun Yat-Sen University,Guangdong Provincial Key Laboratory for Marine Civil Engineering Zhuhai
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| Abstract: |
| 【Background】 At present, the world is undergoing urbanization at an unprecedented speed, and the rapid urbanization has brought so many problems that destroyed the sustainable development of cities. Under this background, urban roof greening emerges as the times required. It can bring many benefits, such as regulating urban microclimate, improving storm and flood management and building livable cities. However, it also faces multiple problems, and one of the biggest problems is that greening roof irrigation is expensive and difficult, and how to irrigate effectively and automatically has become a limited problem for developing and popularizing Green Roof . 【Objective】This paper mainly considers the importance and feasibility of roof irrigation, designed a new irrigation method, Microfiber Capillary Wicking Infiltrating Irrigation (MCWII), which is deigned to storage excess rainwater for irrigation during periods of water shortage or drought. 【Method】 Four plexiglass experiment platform were ser up on the roof, according to the arrangement of plant layer, soil substrate layer, water storage layer and water impervious base layer. And three different shapes (steering wheel; cyclic annular; straight) of the Microfiber Capillary Wicks (MCW) were placed in plexiglass experiment platform for control experiments. And a series of soil moisture content data, from May 25, 2017 to August 30,2017, were recorded in each plexiglass experiment platform. The characteristics of Soil Moisture Content (SMC) was studied in plexiglass experiment platforms with different structures by setting up a roof experiment in summer. In addition, different irrigation uniformity coefficients (UC), important indictors to evaluate irrigation quality, were calculated and classified in each platform in a different time period. 【Result】The result showed that the mean SMC of every MCWII platform was decreasing in the order of steering wheel MCW, cyclic annular MCW, and straight MCW. The average SMC of three shapes of MCW treatments was 46.7% higher than none Microfiber Capillary Wick platform. The days in which the average soil moisture content was above 5% in the microfiber infiltration irrigation platform accounted for 97.8% of the total number of experiment days, while the days in the non-infiltration irrigation platform only accounted for 2/3 of the total number of days. In terms of UC, the Christiansen uniformity coefficient (CU_C) of caMCW was close to that of steering wheel MCW, and the CU_C of cyclic annular MCW at the water supply radius 25cm, 20cm, 15cm, 10cm, and 5cm were 1.6%，4.2%，4.8%，4.3% and 9.3% higher than that of steering wheel MCW, respectively. The irrigation variable coefficient (C_V) of steering wheel MCW and cyclic annular MCW was controlled within 6% everyday, while that of straight MCW was broken through 10%. 【Conclusion】The water supply capacity of MCWII system was favorable, with stable and even infiltrating irrigation characteristics; MCWII can help to increase SMC in GR, and will effectively relieve the roof drought phenomenon and promote sustainable development of GR. This study provided an idea for the promotion of new water-saving technology and has an important reference value for the sustainable development of greening roof. |
| Key words: Microfiber Capillary Wicking Irrigation; Soil Moisture Content; Christiansen Uniformity Coefficient; Water Supply Uniformity; Greening roof irrigation |
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