摘要
通过室内模拟人工降雨试验,研究了降雨强度、叶面积指数、基质厚度、初始含水率对简单屋顶绿化延迟产流时间的影响。试验结果表明,对于简单屋顶绿化,其延迟产流时间主要受降雨强度和叶面积指数的影响:随着降雨强度的增加,延迟产流时间逐渐缩短;随着叶面积指数的增大,延迟产流时间逐渐增长。试验中还发现草炭含量的增加能增强基材的持水性能,而煤渣含量的增加会削弱基材的持水性,陶粒含量过多不利于植物生长。最后,利用多元线性回归分析得到了关于延迟产流时间的计算模型,其对于预测简单屋顶绿化产流时间具有较好的参考价值。
The effects of delayed discharge time in extensive green roof,i. e. rainfall intensity,the leaf area index,substrate thickness and initial moisture content are studied by laboratory simulated rainfall tests. The test results indicate that the delayed runoff time is mainly affected by rainfall intensity and leaf area index. The delayed discharge time gets shorten with the increment of rainfall intensity and it increases with the increment of leaf area index. It's found that the increment of peat content can enhance the water holding characteristics of the substrate,and the increment of coal cinder content will weaken the water holding characteristics of the substrate. It shows that ceramsite has no contribution to plants growth. Finally,a prediction model of delayed discharge time is obtained by the multivariate linear regression analysis.It shows a good consistence between forecasting data and testing results.
出处
《土木工程学报》
EI
CSCD
北大核心
2015年第S2期391-395,共5页
China Civil Engineering Journal
基金
国家自然科学基金(51178251)
关键词
简单屋顶绿化
模拟降雨
延迟产流时间
预测模型
extensive green roof
simulated rainfall
delayed discharge time
prediction model
