Simulation of Soil Hydrological Components in Chuncheon over 30 years Using E-DiGOR Model

Abstract

The hydrological components of a sandy loam soil of nearly level in Chuncheon over 30 years were computed using the E-DiGOR model. Daily simulations were carried out for each year during the period of 1980 to 2009 using standard climate data. Reference evapotranspiration and potential soil evaporation based on Penman -Montheith model were higher during May to August because of the higher atmospheric evaporative demand. Actual soil evaporation was mainly found to be a function of the amount and timing of rainfall, and presumably soil wetness in addition to atmospheric demand. Drainage was affected by rainfall and increased with a higher amount of precipitation and soil water content. Excess drainage occurred throughout rainy months (from July to September), with a peak in July. Therefore, leaching may be a serious problem in the soils all through these months. The 30-year average annual reference evapotranspiration and potential soil evaporation were 951.5 mm and 714.2 mm, respectively. The actual evaporation from bare soil varied between 396.9-528.4 mm and showed comparatively lesser inter-annual variations than drainage. Annual drainage rates below 120 cm soil depth ranged from 477.8 to 1565.9 mm. The long-term mean annual drainage-loss was approximately two times higher than actual soil evaporation.

Sensitivity of soil evaporation and reference evapotranspirationto climatic variables in South Korea

“…Simulations were done for a sandy loam soil with a nearly level, bare surface. The measured and nonmeasured parameters of the defined soil were obtained from the literature (van Dam et al, 1997;Ács, 2003;Moret et al, 2007;Aydin et al 2012). The sensitivity analyses of the Penman-Monteith type equations to the major climatic elements were carried out for a single year, because they require a large number of computations.…”

A new method for calculating the vibration-rotation-tunneling spectra of molecular clusters and its application to the water dimer

“…Volumetric water content at field capacity and saturation were taken as 0.18 and 0.41 cm 3 cm −3 , respectively. The other soil parameters for model calibration were compiled from literature (Aydin et al, 2012a).…”

“…Annual precipitation (Pp), actual soil evaporation (Ea), direct surface runoff, and subsurface flow in Chuncheon (Pp and Ea were previously reported byAydin et al 2012a). …”

Long-term water balance of a bare soil with slope in Chuncheon, South Korea

“…Changes in the soil water content greatly deal with evaporation; however, the calculation of actual soil evaporation poses a serious dilemma (Aydin et al, 2012a). A reasonable estimation under wet conditions is to set evaporation equal to potential evaporation (Croke et al, 2000).…”

“…The hydrological components of a nearly level sandy loam soil in Chuncheon, South Korea, over 30 years were previously computed by Aydin et al (2012a) using the E-DiGOR model. The present study was carried out in the same location to simulate the water balance components of a bare soil possessing different levels of slope.…”