Evapotranspiration Measurement and Estimation of Crop Coefficient for Native Plant Species of Green Roof in the Tropics

被引:7
|
作者
Chow, Ming Fai [1 ,2 ]
Abu Bakar, Muhammad Fadhlullah [3 ]
Wong, Jee Khai [4 ]
Ling, Lloyd [5 ]
机构
[1] Monash Univ Malaysia, Sch Engn, Discipline Civil Engn, Jalan Lagoon Selatan, Bandar Sunway 47500, Selangor, Malaysia
[2] Univ Tenaga Nasl UNITEN, Inst Energy Infrastruct IEI, Kajang 43000, Selangor, Malaysia
[3] Univ Tenaga Nas, Coll Engn, Dept Civil Engn, Kajang 43000, Selangor, Malaysia
[4] Univ Tenaga Nasl UNITEN, Inst Sustainable Energy ISE, Kajang 43000, Selangor, Malaysia
[5] Univ Tunku Abdul Rahman, Jalan Sungai Long, Kajang 43000, Selangor, Malaysia
关键词
evapotranspiration; extensive green roof; green infrastructures; sedum; tropical; QUANTIFYING EVAPOTRANSPIRATION; MOISTURE-CONTENT; MODEL; PERFORMANCE; RETENTION; RAINWATER;
D O I
10.3390/w13121669
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Extensive green roof is one of the sustainable urban stormwater management alternatives to manage and mitigate the urban surface runoff. In order to implement green roofs more effectively, suitable plant species and substrate components for tropical climate must be identified. The aim of this study is to investigate the evapotranspiration (ET) behaviors in extensive green roofs based on different substrate types and local native plant species. Four green roof test beds containing pro-mixing pot and burn soils were each vegetated with Axonopus Compressus (grass) and Portulaca Grandiflora (sedum). A weather station with soil moisture sensors was installed to measure the weather and soil moisture data. The results showed that the mean ET rates for grass-pot soil, sedum-pot soil, grass-burn soil and sedum-burn soil were 1.32 +/- 0.41 mm/day, 2.31 +/- 0.72 mm/day, 1.47 +/- 0.39 mm/day and 2.31 +/- 0.43 mm/day, respectively. It is noted that environmental parameters such as ambient temperature, solar radiation and wind speed showed significantly positive relationship (p value < 0.01) with ET rates of green roofs except relative humidity. The crop coefficients (K-s) for the studied green roof plant species are estimated based on actual and reference evapotranspiration rates. The sedum planted in burn soil showed the highest crop coefficient (0.64), followed by sedum in pot soil (0.62), grass in burn soil (0.39) and grass in pot soils (0.37), respectively. The findings in this study also showed that substrate with better water retention capacity generally improved the K-s values.
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页数:13
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