季节性冻土表层水分与偏振反射的关系

季节性冻土是存在于寒温带气候条件下的典型土壤形态。在季节性冻土中,水是以冰晶的形式存在的。一定含水量的季节性冻土表现为非朗伯特性,这就会导致季节性冻土表面的反射光中包含偏振信息。以黑土为例,通过对季节性冻土的线偏振度的测量,建立其含水量与偏振度之间的函数关系,并确定季节性冻土表现为非朗伯体含水量临界值。该临界值的确定对季节性冻土圈含水量的预测以及季节性冻土融化过程产生的水量计算提供了可靠的研究方法。

The Relationship between the Moisture of Seasonal Frozen Soil Surface and Polarized Reflectance

Seasonal frozen soil,in which water exists in the form of ice crystals,is a typical soil pattern found in cold temperate zone.The seasonal frozen soil with certain moisture is proved to be non Lambert reflector,which leads to the fact that the reflected light on the surface of seasonal frozen soil may contain some polarization information.Through taking black soil as an example,we establish a function between the moisture content and the degree of polarization,and determine that the seasonal frozen soil can be manifested by the critical value of the moisture content of non Lambert reflector.The determination of the critical value provides a reliable research method for the prediction of the moisture content of seasonal frozen soil circle and the water quantity calculation in the melting process of seasonal frozen soil.