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http://dx.doi.org/10.5532/KJAFM.2008.10.2.035

Soil Moisture Modelling at the Topsoil of a Hillslope in the Gwangneung National Arboretum Using a Transfer Function  

Choi, Kyung-Moon (Department of Environmental Engineering, Pusan National University)
Kim, Sang-Hyun (Department of Environmental Engineering, Pusan National University)
Son, Mi-Na (Department of Environmental Engineering, Pusan National University)
Kim, Joon (Department of Atmospheric Sciences, Yonsei University)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.10, no.2, 2008 , pp. 35-46 More about this Journal
Abstract
Soil moisture is one of the important components in hydrological processes and also controls the subsurface flow mechanism at a hillslope scale. In this study, time series of soil moisture were measured at a hillslope located in Gwangneung National Arboretum, Korea using a multiplex Time Domain Reflectometry(TDR) system measuring soil moisture with bi-hour interval. The Box-Jenkins transfer function and noise model was used to estimate spatial distributions of soil moisture histories between May and September, 2007. Rainfall was used as an input parameter and soil moisture at 10 cm depth was used as an output parameter in the model. The modeling process consisted of a series of procedures(e.g., data pretreatment, model identification, parameter estimation, and diagnostic checking of selected models), and the relationship between soil moisture and rainfall was assessed. The results indicated that the patterns of soil moisture at different locations and slopes along the hillslope were similar with those of rainfall during the measurment period. However, the spatial distribution of soil moisture was not associated with the slope of the monitored location. This implies that the variability of the soil moisture was determined more by rainfall than by the slope of the site. Due to the influence of vegetation activity on soil moisture flow in spring, the soil moisture prediction in spring showed higher variability and complexity than that in early autumn did. This indicates that vegetation activity is an important factor explaining the patterns of soil moisture for an upland forested hillslope.
Keywords
Soil moisture; Time domain reflectometry; Time series; Transfer function model;
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