遥感Penman-Monteith模型中土壤含水量与土壤蒸发的关系

土壤含水量是影响土壤蒸发的重要因素,分析土壤含水量变化对土壤蒸发的影响,对水资源管理有积极作用。遥感Penman-Monteith(P-M)模型是利用遥感手段进行蒸散发模拟的重要方法,且能分别对土壤蒸发和植被散发进行计算。利用遥感P-M模型对望都站的蒸散发进行模拟,并结合地表土壤含水量数据分析了土壤含水量变化对模型参数及土壤蒸发的影响。结果表明:(1)遥感P-M模型对望都站蒸散发取得较好效果,纳什效率系数(NSE)为0.559;(2)土壤含水量变化与遥感P-M模型的土壤蒸发系数间具有不确定性;(3)在本研究的模拟期内,与植被散发相比,土壤含水量变化与土壤蒸发间的一致性更强。

Assessment the relationship between soil evaporation and soil moisture using Remote Sensing Penman-Monteith model

Soil moisture content is an important factor affecting soil evaporation Analyzing the influence of soil moisture variation on soil evaporation has a positive effect on water resource management. The remote sensing Penman-Monteith (P-M) model is a remote sensing based method for evapotranspiration simulation and can calculate soil evaporation and vegetation transpiration separately. This study calculates the evapotranspiration for Wangdu station and investigates the effects of soil moisture on the model parameters and soil evaporation. The results showed that the model has a good performance at Wangdu station with a value of NSE (0. 559). There is an uncertain relationship between soil moisture and model parameters. Comparing with the vegetation transpiration, the consistency of soil moisture and soil evaporation is stronger in the simulation period for this particular research.