ABSTRACT

Eddy covariance (EC) systems are expensive and not financially viable in a budget-restricted hydrological monitoring network. The surface renewal (SR) method is a cheaper alternative that requires a reduced fetch, but is currently dependent on EC for calibration. SR methods not requiring calibration (surface renewal 2 (SR2) and surface renewal dissipation theory (SRDT)) have been used but are not widely tested over indigenous vegetation. The aim of this research was to test the SR approach as a viable alternative to EC for the estimation of sensible heat flux (H) over indigenous vegetation (Leucosidea sericea) in a montane catchment for unstable periods. For both summer (7 d) and winter (9 d) campaigns, the three SR methods showed a good relationship with the EC method for the estimation of H. Overall, the SRDT method was the most viable alternative to EC and produced acceptable estimates of H over an indigenous vegetation canopy in a montane catchment.

摘要

在预算受限的水文监测网络中，涡流协方差 (EC) 系统价格昂贵且在财务上不可行。表面更新 (SR) 方法是一种更便宜的替代方法，需要减少提取，但目前依赖 EC 进行校准。不需要校准的 SR 方法（表面更新 2 (SR2) 和表面更新耗散理论 (SRDT)）已被使用，但并未对本地植被进行广泛测试。本研究的目的是测试 SR 方法作为 EC 的可行替代方案，用于估算本地植被（Leucosidea sericea）的感热通量 ( H )) 在不稳定时期的山地集水区。对于夏季 (7 天) 和冬季 (9 天) 运动，三种 SR 方法与 EC 方法在H估计方面显示出良好的关系。总体而言，SRDT 方法是 EC 最可行的替代方法，并且在山地集水区的本地植被冠层上产生了可接受的H估计值。