An in-situ measurement method of evapotranspiration from typical LID facilities based on the three-temperature model

摘要: Abstract Low impact development (LID) facilities have ability to increase evapotranspiration (ET), and thus moderate the hydrological cycle mitigate urban heat island (UHI) effects. However, it is difficult measure ET of LID by traditional methods (e.g. weighing lysimeter, Bowen ratio system eddy covariance system) in environment. A recently developed method, called three-temperature model (3T model), has been used actual natural underlying surfaces situ. its applicability measurement for not investigated. In order investigate accuracy this method estimate influencing factors, experimental devices vegetated (green roof with Zoysia tenuifoli (GRZ) green Callisia repens (GRC)) non-vegetated (permeable concrete pavement (PCP) permeable brick (PBP)) were installed. The was validated comparing measured 3T that platform (hourly data, n = 223–302 each facility). After validation, variations typical under moist sub-tropical weather condition Shenzhen, China. results indicate coefficient determination (R2) between 0.63, 0.60, 0.70 0.65 GRZ, GRC, PCP PBP, respectively, slopes regression equations are close 1 their intercepts 0. Furthermore, higher absolute relative error (ARE) estimation early morning late afternoon than rest daytime. This mainly due effect energy related such as solar radiation, air temperature difference reference surface temperature. addition, rates can maintain at a relatively high level first few days after rainfall. decreases faster other during drying period. These demonstrate