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党振国, 蒋春博, 李怀恩, 汤海川, 饶茂郅, 宋凯歌.雨水花园水力传导度的衰减过程及其防治措施研究水资源与水工程学报[J].,2022,33(6):137-144
雨水花园水力传导度的衰减过程及其防治措施研究
Hydraulic conductivity attenuation process of rain garden and its control measures
  
DOI:10.11705/j.issn.1672-643X.2022.06.17
中文关键词:  雨水花园  常规绿地  水力传导度  衰减过程  下渗率  颗粒级配
英文关键词:rain garden  conventional green space  hydraulic conductivity  attenuation process  infiltration rate  particle size distribution
基金项目:国家自然科学基金项目(52000150、51879215)
作者单位
党振国1, 蒋春博1,2, 李怀恩1,2, 汤海川1, 饶茂郅1, 宋凯歌1 (1.西安理工大学 水利水电学院 陕西 西安 710048 2.西安理工大学 省部共建西北旱区生态水利国家重点实验室 陕西 西安 710048 ) 
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中文摘要:
      雨水花园通过“植物-土壤-微生物”的综合作用来渗透、净化雨水径流,但随着运行时间的延长,雨水花园填料堵塞会造成水力传导度降低,从而导致其运行寿命的衰减。以运行10 a的实例入渗型雨水花园及其周围常规绿地作为研究对象,通过对比二者消纳的污染总负荷、填料下渗率以及不同埋深填料的颗粒级配,研究雨水花园水力传导度衰减的影响因素。结果表明:雨水花园主要污染物SS、TN、TP、COD入流总负荷量分别为544.51、21.55、1.65和514.50 g/m2,是常规绿地的7~34倍;现阶段,常规绿地的稳定下渗率是雨水花园的近10倍。从时间尺度上对比,雨水花园运行10 a后的稳定下渗率为23.24 mm/h,与建成初期相比衰减达5.2倍;与常规绿地在空间尺度上对比,雨水花园填料埋深0~50 cm以内黏粒和粉粒的含量相对较高,埋深50~100 cm范围内雨水花园和常规绿地颗粒级配基本一致,表明雨水花园堵塞主要发生在填料埋深0~50 cm范围内。最后,结合降水条件和运行机制,提出了雨水花园堵塞防治措施。
英文摘要:
      The rain garden infiltrates and purifies rainfall runoff through the comprehensive effect of “plant-soil-microorganism”; however, the clogging of fillers leads to the decrease of its hydraulic conductivity with the extension of operation time, resulting in the attenuation of the rain garden operation life. Taking the rain garden of infiltration type which has been operating for ten years and its surrounding conventional green space in Xi’an University of Technology as the research objects, we studied the influencing factors of the hydraulic conductivity attenuation of the rain garden by comparing the total pollution load of these two facilities, the infiltration rate of the fillers and the particle size distribution of different layers. The results showed that the main pollutants in the rain garden are SS, TN, TP and COD, and the total inflow loads are about 544.51, 21.55, 1.65 and 514.50 g/m2, which are 7-34 times of those in the conventional green space. At present, the steady infiltration rate of the conventional green space is nearly 10 times of that of the rain garden. From the temporal perspective, the steady infiltration rate of the rain garden after 10 years of operation is 23.24 mm/h, which is 5.2 times lower than that in the initial stage of establishment. Compared with the conventional green space on vertical spatial scale, the content of clay and powder particles in the rain garden fillers with the buried depth of 0-50 cm are relatively high; whereas the particle size distribution of the two facilities buried deeper than 50 cm are basically the same, indicating that the phenomenon of clogging mainly occurred in the fillers with the buried depth of 0-50 cm. Finally, the prevention and control measures of clogging are put forward, according to the precipitation conditions and operation mechanism of the rain garden.
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