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首页> 外文期刊>Urban Forestry & Urban Greening >Reprint of : Hydrological behaviour of rain gardens and plant suitability: A study in the Veneto plain (north-eastern Italy) conditions (Reprinted Article)
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Reprint of : Hydrological behaviour of rain gardens and plant suitability: A study in the Veneto plain (north-eastern Italy) conditions (Reprinted Article)

机译：转载：雨园和植物适宜性的水文行为：威尼托平原（意大利东北地区）条件的研究（转载文章）

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Since spring 2011 the roof of a building on the Agripolis Campus of the University of Padova (Italy) has been used as a drainage area for two rain gardens with a circular area of about 10% and 20% of the drainage area respectively. To improve soil infiltration, the topsoil was removed up to the depth of 1m and filled with a mix of 50% sand, 25% compost and 25% of the existing topsoil. Herbaceous perennials were selected and planted to test their adaptability to different soil water conditions in the rain garden. To evaluate the capacity of each rain garden to manage stormwater runoff a simplified water balance was done, estimating actual evapotranspiration using the WUCOLS method. From autumn 2012 runoff volumes were collected just from one pitch of the roof, and directed only into the smaller rain garden that became equal to 15% of the new roof drainage area. We thus had the possibility to test the functionality of rain gardens with three different percentages of roof drainage area: 10, 15 and 20%, even if in different periods. Results are presented relating to a four-year experimental period. Regarding hydrological behaviour, the input water volumes caused a slight overflow only during a few rainfall events. Consequently, the results showed a high capacity to manage stormwater runoff and also in the smaller rain garden almost the total roof runoff volumes infiltrated into the soil. As regards plants, the results indicated that the growth is affected by their position in the rain garden, from the wettest condition in the centre to the driest at the perimeter, except for Hemerocallis hybrida that showed great adaptability in all positions. Aster novibelgii, Echinacea purpurea, Iris pseudacorus, Molinia caerulea and Rudbeckia fulgida also showed good adaptation, even if not in all rain garden zones, with highly aesthetic results. Lythrum salicaria and Saponaria officinalis plants appeared to be unsuitable for rain gardens. The results of the experiment have shown that, in the Veneto plain environment, rain gardens with a size of 10-15% of the roof drainage area can ensure both the sustainable management of stormwater runoff and a high aesthetic functionality.
机译：自2011年春季以来，帕多瓦大学阿格多利斯校区（意大利）的建筑物屋顶被用作两个雨披的排水区，分别为圆面积约10％和20％的排水区。为了改善土壤浸润，将表土渗出至1米的深度，填充50％砂，25％堆肥和现有表土25％的混合物。选择并种植草本多年生植物，以测试他们对雨水花园不同土壤水条件的适应性。为了评估每个雨水花园的能力来管理雨水径流的简化水平，使用果酱方法估算实际蒸发。从2012年秋天从屋顶的一个间距收集到径流卷，只有进入较小的雨凉花园，成为新屋顶排水区的15％。因此，我们可能需要测试雨花园的功能，其中三种不同百分比的屋顶排水面积：10,15和20％，即使在不同的时期。提出了与四年的实验期有关的结果。关于水文行为，输入水量仅在几次降雨事件期间引起轻微溢出。因此，结果表明，管理雨水径流的高能力，并且在较小的雨水花园中也几乎将屋顶径流量渗入土壤中。至于植物，结果表明，在雨水花园中，生长受到雨水园中的地位，从中心到周边的最干燥状态，除了萱草杂交加仑，在所有位置都表现出良好的适应性。 Aster Novibelgii，Echinacea purpurea，鸢尾假毒素，莫里非菊属植物，莫里非菊属植物和鲁吉蒂达也表现出良好的适应性，即使不在所有雨园区，也具有高度审美结果。 Lythrum Salicaria和Saponaria Officinalis植物似乎不适合雨凉花园。实验结果表明，在威尼托平原环境中，雨水花园的屋顶排水区的10-15％可以确保雨水径流的可持续管理和高审美功能。

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