Effect of vegetation treatment and water stress on evapotranspiration in bioretention systems
Effect of vegetation treatment and water stress on evapotranspiration in bioretention systems
复制标题
植被处理和水分胁迫对生物滞留系统蒸散量的影响
DOI：
10.1016/j.watres.2024.121182
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发表时间：
2024
期刊：
影响因子：
12.8
通讯作者：
De-Ville S
中科院分区：
文献类型：
--
作者：
De-Ville S
在生物滞留系统中，蒸发蒸腾是减少雨水径流的关键水文过程，无论其物理结构如何。因此，在设计任何生物保留系统时，了解可通过蒸散作用返回到大气中的雨水的量是一个关键的考虑因素。本研究通过实验室规模的柱状实验，建立了三种常见的、结构不同的生物保留性植被处理(宜人草混合，以及德香草和蝴蝶兰的单一培养)与非植被对照的蒸散动态。通过连续的质量和水分损失数据，将2021年春季、2021年夏季和2022年春季5个14天干旱期的观测蒸散速率与FAO-56 Penman-Monteith模型预测的蒸散速率进行了比较。在为期14天的试验中，土壤水分的减少导致了蒸散速率的降低。这就需要在作物系数的同时使用土壤水分提取函数，以代表粮农组织-56彭曼-蒙特斯参考蒸散估计值的实际蒸散。作物系数(Kc)在0.65和2.91之间变化，在缺乏特定处理经验数据的情况下，1.0被确定为推荐的缺省值。Kc=1.0、负荷比为10：1的连续水文模型表明，对于位于英国和爱尔兰的生物保育系统，蒸散量可占年水量预算的1-12%，当使用最高观测Kc(2.91)时，蒸散量增加到最大值35%。
Evapotranspiration is a key hydrological process for reducing stormwater runoff in bioretention systems, regardless of their physical configuration. Understanding the volumes of stormwater that can be returned to the atmosphere via evapotranspiration is, therefore, a key consideration in the design of any bioretention system. This study establishes the evapotranspiration dynamics of three common, structurally different, bioretention vegetation treatments (an Amenity Grass mix, and mono-cultures of Deschampsia cespitosa and Iris sibirica) compared with an un-vegetated control using lab-scale column experiments. Via continuous mass and moisture loss data, observed evapotranspiration rates were compared with those predicted by the FAO-56 Penman–Monteith model for five 14-day dry periods during Spring 2021, Summer 2021, and Spring 2022. Soil moisture reductions over the 14-day trials led to reduced rates of evapotranspiration. This necessitated the use of a soil moisture extraction function alongside a crop coefficient to represent actual evapotranspiration from FAO-56 Penman–Monteith reference evapotranspiration estimates. Crop coefficients (K c) varied between 0.65 and 2.91, with a value of 1.0 identified as a recommended default value in the absence of treatment-specific empirical data. A continuous hydrological model with K c= 1. 0 and a loading ratio of 10: 1 showed that evapotranspiration could account for between 1 and 12% of the annual water budget for a bioretention system located in the UK and Ireland, increasing to a maximum of 35% when using the highest K c observed (2.91).