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Understanding the dynamic patch mosaic of topsoil moisture on arid hillsides has implications for understanding eco-geomorphic processes. The present study used high-resolution maps to investigate the spatial distribution of moisture in the topsoil on the shrub microenvironment scale, and its dynamics during the first days after rain events. These maps were acquired by a thermal infrared (TIR) method, based on close-range TIR imaging and on a model in which spatially consecutive TIR data are converted into soil moisture values. The main results show that, in addition to the general diminishing trend of topsoil moisture content, and in spite of the specific differences between the two research sites, there was, in both arid and semi-arid zones, a general spatio-temporal pattern of topsoil moisture in a shrub microenvironment during the first days after rainfall. This pattern is manifested in the presence of a changing moist patch under the shrub, and diminishing moisture content gradients, from the shrub center towards the bare soil that vary over space and time. An improved understanding of surface water resources is gained from investigations of the spatio-temporal patterns of soil moisture during and following rainfall events. 相似文献
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The southeastern portion of the Yangtze River Estuary (or Yangtze Estuary) was considered to be the deposition center and the mudbank of the Yangtze River Delta.As the fluvial sediment supply began to decline in the 1980s and the reduction accelerated after the completion of the Three Gorge Dam in 2003,more fluvial sediment was trapped decreasing the suspended sediment concentration (SSC) environment in the river mouth area.Moreover,the accretion rate of the mudbank has slowed down in recent dec... 相似文献
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