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为解决目前常用遥感蒸散发模型干、湿限选取不确定性导致蒸散发反演结果存在的空间歧义性,对遥感蒸散发模型干限、湿限进行重新定义。对干湿限进行垂向一维热扩散数值模拟,以验证重新定义的干湿限能量分配假设及部分重要遥感参数取值的合理性。利用疏勒河流域地下水均衡试验场土壤剖面温度数据对干限温度进行验证,均方根误差为1.68K;利用参考作物蒸散量对湿限蒸散量进行验证,线性回归确定性系数约为0.90。研究结果表明:重新定义的干湿限推导求解方案合理,有助于避免遥感蒸散发模型中的空间歧义性。
In order to solve the spatial ambiguity caused by the inversion of evapotranspiration, the uncertainty of dry and wet limit of the commonly used remote sensing evapotranspiration model, the dry limit and wet limit of evapotranspiration model are redefined. The vertical and horizontal thermal diffusivities of the wet and dry limit were numerically simulated to verify the redefined hypothesis of energy allocation of wet and dry limit and the rationality of some important remote sensing parameters. The root mean square error (RMSE) was 1.68 K using the soil profile temperature data from the groundwater equalization test in the Shulehe basin. The validation of the wet evapotranspiration using the reference crop evapotranspiration showed that the linear regression coefficient was about 0.90. The results show that the redefined solution of dry-wet limit derivation is reasonable and helps to avoid spatial ambiguity in remote sensing evapotranspiration models.