| 引用本文: | 王志强,黄思宇,潘昶江,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,2022,41(6):55-63. |
| WANG Zhiqiang,HUANG Siyu,PAN Changjiang,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,2022,41(6):55-63. |
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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率分布特征，并评估了方向盘式超纤渗灌、环状超纤渗灌、直芯超纤渗灌的灌水均匀度。【结果】土壤含水率按照方向盘式超纤渗灌、环状超纤渗灌、直芯超纤渗灌方式递减，且3种超纤渗灌的平均土壤含水率比无渗灌高出46.7%。环状超纤渗灌与方向盘式超纤渗灌的克里斯琴森均匀系数CUC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%的时间大于95%。供水半径为25、20、15、10 cm和5 cm处，环状超纤渗灌比直芯超纤渗灌CUC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率的能力，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。 |
| 关键词: 超纤渗灌；土壤含水率；供水均匀度；克里斯琴森均匀系数；屋顶灌溉 |
| DOI：10.13522/j.cnki.ggps.2020027 |
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| The Efficacy of Microfiber Capillary Wicking Irrigation System for Improving Soil Water Distribution in Green Roofs |
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WANG Zhiqiang, HUANG Siyu, PAN Changjiang, ZHANG Qingtao
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1. School of Civil Engineering, Sun Yat-Sen University, Zhuhai 519082, China; 2. Guangdong University Key Laboratory of
Water Circulation and Water Safety in South China, Sun Yat-Sen University, Guangzhou 510275, China;
3. Guangdong Provincial Key Laboratory of Marine Civil Engineering, Zhuhai 519082, China;
4. School of Geography and Planning, Sun Yat-Sen University, Guangzhou 510275, China
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| Abstract: |
| 【Objective】Green roof has been increasingly used in new buildings not only as a compensation to the lost habitat in urbanization but also as a strategy to mitigate urban flooding. One issue in green roof maintenance is irrigation, which is expensive and difficult to manage. This paper studied the efficacy of microfiber capillary wick as an irrigation system for green roofs. 【Method】Four plexiglass platforms were set up on a roof. From the top to the bottom, each consisted of a planting layer, a substrate layer, a water storage layer and a base layer to prevent exfiltration. Microfiber capillary wick (MCW) in different patterns - steering wheel (MCWI), spiral annular rings (MCWII) and straight capillary (MCWIII) - were placed in the plexiglass platforms for irrigation; irrigation without wick was taken as the control. In each platform, we measured the change in soil moisture content from 25 May to 30 August 2017. We also calculated the change in irrigation uniformity coefficient (UC) of each system. 【Result】Based on the mean SMC, the systems are ranked in the order: MCWII < MCWI < MCWIII. The average SMC in the three treatments was 46.7% higher than that in the control. Using MCW can keep the soil water content more than 5% during 97.8% of the experimental period, compared to 2/3 in the control. The Christiansen irrigation uniformity coefficient (CUC) of MCWI and MCWIII was approximately the same, while the CUC of MCWII at radius of 25 cm, 20 cm, 15 cm, 10 cm, and 5 cm was 1.6%，4.2%，4.8%，4.3% and 9.3% higher than that of MCWI, respectively. Daily irrigation variable coefficient (CV) of MCWI and MCW II was approximately 6%, while the CV of MCWIII was more than 10%. 【Conclusion】MCWII worked best by increasing SMC and relieving drought stress. The results presented in this work have wide implications for developing water-saving irrigation technologies for green roofs. |
| Key words: microfiber capillary wicking irrigation; soil moisture content; Christiansen uniformity coefficient; water supply uniformity; greening roof |
