Department of Civil and Environmental Engineering, The Citadel, Charleston, South Carolina, United States of America.
Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, New York, United States of America.
PLoS One. 2022 Apr 20;17(4):e0266593. doi: 10.1371/journal.pone.0266593. eCollection 2022.
The objective of this study was to compare the hydrological performance of an irrigated, 127 mm deep green roof, planted with vegetation native to the New York City area, to a conventional, non-irrigated, 100 mm deep green roof, planted with drought-tolerant Sedum spp. Four years of climate and runoff data from both green roofs were analyzed to determine seasonal stormwater retention. Empirical relationships between rainfall and runoff were developed for both roofs, and applied to historical rainfall data in order to compare stormwater retention values for different rainfall depths. Crop coefficients for the vegetation on each green roof were estimated using the soil moisture extraction function. This function was also used to estimate monthly evapotranspiration. Despite being irrigated, the green roof with native vegetation retained more stormwater per annum (64%) than the non-irrigated green roof planted with Sedum spp. (54%). The green roof planted with native vegetation also had approximately twice the crop coefficient (1.13) than the green roof planted with Sedum spp. (0.57), indicating that the New York City native plants transpire more stormwater than the Sedum spp. plants given certain climate and substrate moisture conditions. Overall, the results of the study indicate that, for the New York City climate region, irrigated green roofs of native vegetation have the capacity to better manage stormwater than non-irrigated green roofs planted with drought-tolerant succulents.
本研究的目的是比较灌溉深度为 127 毫米、种植有纽约市本地植被的绿色屋顶和传统非灌溉、深度为 100 毫米、种植耐旱景天属植物的绿色屋顶的水文性能。分析了这两个绿色屋顶四年的气候和径流水数据，以确定季节性雨水滞留情况。为这两个屋顶开发了降雨和径流水之间的经验关系，并将其应用于历史降雨数据，以比较不同降雨深度下的雨水滞留值。使用土壤水分提取函数估算了每个绿色屋顶植被的作物系数。该函数还用于估算每月的蒸散量。尽管进行了灌溉，但种植有本地植被的绿色屋顶每年的雨水滞留量（64%）高于种植有景天属植物的非灌溉绿色屋顶（54%）。种植有本地植被的绿色屋顶的作物系数（1.13）约为种植有景天属植物的绿色屋顶的两倍（0.57），这表明在某些气候和基质水分条件下，纽约市本地植物比景天属植物蒸腾更多的雨水。总的来说，研究结果表明，对于纽约市气候区，灌溉的本地植被绿色屋顶比种植耐旱多肉植物的非灌溉绿色屋顶更有能力管理雨水。
