| 引用本文: | 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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| 摘要: |
| 【目的】灌溉难是城市绿色屋顶发展的一个重要限制因素。为了克服屋顶灌溉难题，本文提出了一种新型的自动节水渗灌技术，即超细纤维毛细芯渗灌（超纤渗灌）。【方法】通过屋顶试验研究了该渗灌系统的土壤含水量分布特征，并评估了不同结构 方向盘式、环状、直芯超纤渗灌的灌水均匀度（衡量灌溉质量的重要指标）。 【结果】结果表明，土壤含水量按照方向盘式、环状、直芯超纤渗灌方式递减，且三种超纤渗灌的平均土壤含水量比无渗灌高出46.7%。环状与方向盘式超纤渗灌的克里斯琴森均匀系数(CU_C)相差不大。方向盘式超纤渗灌平台以及环状超纤渗灌平台土壤含水率高于5%的天数大于95%。供水半径为25cm、20cm、15cm、10cm和5cm处，环状比直芯超纤渗灌CU_C分别高1.6%、4.2%、4.8%、4.3%和9.3%。【结论】超纤渗灌供水能力良好，具备自动灌溉、提高以及稳定土壤含水量的能力，将会缓解屋顶植被缺水干旱现象并促进绿色屋顶的健康运行。本研究为节水新技术的研发提供了一种思路，对绿色屋顶的可持续发展与推广具有重要参考价值。 |
| 关键词: 超纤渗灌；土壤含水量；供水均匀度；克里斯琴森均匀系数；屋顶灌溉; |
| DOI： |
| 分类号:S27 |
| 基金项目:国家自然科学基金面上项目(31470707和31270748) ; 深圳市科技研发资金基础研究项目(JCYJ20150331160617771) |
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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 |
