生物保水能保留多少水,水又去了哪里?

IF 2.3 Q3 ENVIRONMENTAL SCIENCES Blue-Green Systems Pub Date : 2021-09-25 DOI:10.22541/au.163255049.94952987/v1
S. Spraakman, J. Martel, J. Drake
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引用次数: 1

摘要

生物滞留是一种城市环境的绿色雨水基础设施,通过减少峰值流量和径流量,鼓励渗透和蒸发,模拟自然水文系统。本研究考察了2018年至2019年间位于加拿大安大略省沃恩的生物保持系统的完整水平衡。水量平衡进一步被事件大小分解,其中事件大小由降雨频率分析决定。补给是总体水平衡的最大组成部分(占流入流量的86%),以及事件规模。蒸散发是第二大水分平衡成分(占总流入的7%),当只考虑小事件(复发概率为50%)时,蒸散发是流入的重要组成部分(21%)。蒸散发是一个缓慢但持续的过程,总体平均为2.3 mm/d,生长季节平均为2.9 mm/d。气候变化可能带来更多的雨天和更高的温度,这将通过增加蒸散发和流入来影响生物保持水平衡。保留目标的设计标准应根据最新的降雨频率分析进行更新,以适应不断变化的气候条件。
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How much water can bioretention retain, and where does it go?
Bioretention is a type of green stormwater infrastructure for the urban environment that mimics a natural hydrologic system by reducing peak flows and runoff volumes and encouraging infiltration and evapotranspiration. This study examines the complete water balance of a bioretention system located in Vaughan, Ontario, Canada, between 2018 and 2019. The water balance was further broken down by event size, where the event size was determined by rainfall frequency analysis. Recharge was the largest component of the water balance overall (86 % of inflow), as well as by event size. Evapotranspiration was the next largest water balance component (7 % of inflow overall), and was a significant component of inflow (21 %) when considering only small events (50 % probability of recurrence). Evapotranspiration is a slow but consistent process, averaging 2.3 mm/day overall and 2.9 mm/day during the growing season. Climate change is likely to bring more wet days and higher temperatures, which will impact the bioretention water balance by increasing evapotranspiration and inflow. Design standards for retention targets should be updated based on the most recent rainfall frequency analyses to adjust for changing climate conditions.
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Blue-Green Systems
Blue-Green Systems Multiple-
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