Land surface hydrology - spatial heterogeneity

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The land surface is the most heterogeneous region in hydrology due to various factors including land use, soil characteristics, vegetation, and topography. 

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We proposed a new downscaling approach to observe soil moisture using two types of microwave sensors. We combined data from a passive sensor with a high temporal resolution and an active sensor with a high spatial resolution through a land data assimilation system. We demonstrated that the system can capture high spatiotemporal resolution soil moisture at two lightly vegetated sites.

Ref: (Toride et al., 2019)

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I also conducted a theoretical study to incorporate spatial heterogeneity in the soil water flow equation with a stochastic differential equation (so-called Fokker-Planck equation).