摘要
乔木冠层雨水截留作用对降雨产流和径流削减有显著影响,而国内相关的模型研究较少。在现有城市截留效益模型比较和植被实地调查的基础上,利用i-Tree Eco模型评估2014~2018年北京建筑大学西城校区内21种乔木冠层的雨水截留和径流削减效益,推导计算径流削减量的校准方法,并结合相关性分析和回归分析探究城市林冠截留影响因素的作用规律。结果表明:近5年校区内乔木的年均截留体积1365.38m^(3),平均年截留率10.6%,年均径流削减量266.83m^(3),校准后较原结果平均增加14.5%;叶面积与年截留体积呈显著线性正相关关系;降雨因素在月尺度下对截留作用及其径流削减能力的影响更显著,月截留量与月降雨天数呈线性正相关关系;径流削减量在降雨较小时对林下不透水面占比更敏感。研究可为国内相关模型评估和城市提升绿地雨水消纳能力等提供参考。
Based on the comparison of existing models and field research,a quantitative analysis and evaluation on ecological benefits of canopy interception of arbors in Xicheng Campus of BUCEA through 2014 to 2018 were conducted by i-Tree Eco model,with the calibration of avoided runoff.The result shows that the average annual intercepted water volume is 1365.38m^(3),the annual rate of interception is 10.6%,the average annual reduced runoff is 266.83m^(3) and the average increase over the original results after calibration is 14.5%.Annual interception volume is significant linear positively correlated with leaf area.The influence of rainfall factors on the interception and runoff reduction ability is more significant on a larger time scale,and there is a linear positive correlation between the monthly interception and rainfall days.The research can provide reference for domestic model application and the improvement of rainwater absorption capacity of urban green space.
作者
常郴
王思思
CHANG Chen;WANG Sisi(Key Laboratory of Urban Stormwater System and Water Environment,Beijing University of Civil Engineering and Architecture,Beijing 100044;School of Environment and Energy Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044;Beijing Advanced Innovation Center for Future Urban Design,Beijing 100044,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2021年第2期136-142,共7页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(31870704)资助。
