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首页> 外文学位 >Green roofs as an urban stormwater best management practice for water quantity and quality in Florida and Virginia.
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Green roofs as an urban stormwater best management practice for water quantity and quality in Florida and Virginia.

机译：绿化屋顶是佛罗里达和弗吉尼亚州城市用水量和水质的最佳雨水管理实践。

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摘要

Green roofs are well known as an urban stormwater volume Best Management Practice (BMP) in northern climates, but information regarding water quality benefits/impacts and optimal plant-growing media combinations for green roofs in the sub-tropics is lacking. The objectives of this study were to: (1) determine the optimal plant-growing medium combination for water and nutrient retention and (2) characterize green roofs' capability to reduce stormwater volume and peak runoff and (3) determine whether green roofs behave similarly (as a sink or source) for nutrients and metals, in Florida and Virginia. Objectives were tested via (i) a green roof bin study in Florida and (ii) paired green roof studies in Florida and Virginia.;The results of the green roof bin study showed that growing medium type affected water retention and nutrient leaching more than plant type. Water retention ranged from a low of 24% for Building Logics (B) medium with no vegetation to a maximum of 83% for UCF (U) growing medium with perennials. Differences among media were attributed to physical characteristics of the media: pore-size distribution and OM content. Plants increased water retention by 7--10% above bare medium, with perennials having the greatest, and succulents having the least effect. TP and TN loads for the establishment period (initial 6-weeks) ranged from 110 mg P m-2 (U-perennials) to 1800 mg P m-2 for (H-succulents or bare medium); and from 190 mg N m-2 (U-runners) to 1800 mg N m-2 (H-succulents). The majority (60--90%) of the nutrient load leached out in the establishment period of the 24-week study period.;Green roofs monitored in Virginia and Florida behaved similarly for water retention and peak reduction. In both Florida and Virginia, small rain events (0.254 cm), had significantly (p0.05) higher mean retention (79% and 98%, Florida and Virginia respectively) than large rain events (26% retention and 72%, Florida and Virginia, respectively). Green roofs significantly (p0.05) reduced the peak runoff in both Florida (94% for small and 60% for large events) and Virginia (100% for small and 79% for large events). Green roofs behaved similarly for nutrients (sources for phosphorus, sinks for N-NO3, and buffered pH) and differently for metals. Al and Fe levels were significantly higher (p0.05) in green roof (GR) runoff than conventional roof (CR) runoff in Florida; while Pb was significantly lower (p0.05) in Virginia GR runoff. In conclusion, this study found that green roofs in the subtropics are better suited as a stormwater volume control BMP, than a nutrient control BMP.
机译：在北方气候中，屋顶绿化是城市雨水量最佳管理实践（BMP），但在亚热带地区，缺乏有关水质效益/影响以及用于屋顶绿化的最佳植物生长介质组合的信息。这项研究的目的是：（1）确定用于水分和养分保留的最佳植物生长介质组合；（2）表征绿化屋顶减少雨水量和峰值径流量的能力；（3）确定绿化屋顶的行为是否相似（作为水槽或水源）在佛罗里达州和弗吉尼亚州的营养物质和金属。通过（i）在佛罗里达州的一个绿色屋顶垃圾箱研究和（ii）在佛罗里达州和弗吉尼亚州的配对绿色屋顶垃圾箱研究对物镜进行了测试;该绿色屋顶垃圾箱研究的结果表明，生长介质类型对水分保持和养分淋失的影响大于植物类型。保水量从无植被的Building Logic（B）培养基的低24％到多年生植物的UCF（U）生长培养基的最高83％不等。介质之间的差异归因于介质的物理特性：孔径分布和OM含量。与裸露培养基相比，植物的保水率提高了7--10％，其中多年生植物的保鲜效果最大，而多肉植物的保鲜效果最低。建立期间（最初的6周）的TP和TN负荷范围从110 mg P m-2（多年生U）到1800 mg P m-2（H多肉植物或裸露培养基）；和从190 mg N m-2（U型营养剂）到1800 mg N m-2（H多肉植物）。在为期24周的研究期内，大部分（60--90％）的养分释放出来;弗吉尼亚州和佛罗里达州监测的绿化屋顶在保水和减峰方面表现相似。在佛罗里达州和弗吉尼亚州，小雨事件（<0.254厘米）的平均滞留率（分别为佛罗里达州和弗吉尼亚州）分别显着（p <0.05）（分别为79％和98％）和大降雨事件（分别为26％和72％，佛罗里达）和弗吉尼亚）。绿化屋顶显着（p <0.05）降低了佛罗里达州（小型活动为94％，大型活动为60％）和弗吉尼亚州（小型活动为100％，大型活动为79％）的峰值径流量。绿化屋顶的养分表现相似（磷的来源，N-NO3的吸收池和缓冲的pH），而金属的表现则不同。佛罗里达的屋顶绿化径流中的铝和铁含量显着高于传统屋顶绿化径流（p <0.05）。而弗吉尼亚GR径流中的Pb明显较低（p <0.05）。总之，这项研究发现，亚热带的绿色屋顶比营养控制BMP更适合用作雨水量控制BMP。

著录项

  • 作者

    Lang, Sylvia Bertie.;

  • 作者单位

    University of Florida.;

  • 授予单位 University of Florida.;
  • 学科 Landscape Architecture.;Engineering Environmental.;Agriculture Soil Science.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 273 p.
  • 总页数 273
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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