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• W2024089733 abstract "토양온도는 비점오염과 관련된 수문학적 및 생지화학적 과정에 영향을 주는 중요한 물리적 환경인자 중 하나이다. 이 연구에서는 분포형 유역모델인 CAMEL(Chemicals, Agricultural Management and Erosion Losses)의 겨울철 토양온도 모의성능을 개선하기 위해서 융설과 토양 동결-융해 모델을 개발하였으며, 경기도 여주에 위치한 시험유역의 4개 지점에서 3개월 동안 관측한 토양온도 자료를 사용하여 모델을 보 검정하였다. 모의 결과, 표층 토양온도에 대해서는 모델이 토양온도의 시계열 변화를 비교적 잘 재현하는 반면(<TEX>$R^2$</TEX> 0.71~0.95, RMSE <TEX>$0.89{sim}1.49^{circ}C$</TEX>), 하부토양층 온도에 대해서는 경우에 따라 모델의 예측오차가 다소 크게 나타났는데(<TEX>$R^2$</TEX> 0.51~0.97, RMSE <TEX>$0.51{sim}5.08^{circ}C$</TEX>), 이것은 모델에서 토양 깊이별 토성을 동일한 것으로 가정한 것이 주요 원인인 것으로 판단된다. 한편, 개발된 모델은 융설에 의한 단열효과와 토양 동결-융해 과정에서 유입 또는 방출되는 잠열흐름의 영향으로 토양온도의 진폭이 감소하는 현상을 잘 모의하고 있다. 비록 모델 구조의 한계와 자료의 부족으로 토양온도에 대한 다소의 예측오차가 발생하였지만, 개발된 토양온도 모델은 시험유역의 토지이용 및 지형에 따른 토양온도와 적설상당수량의 시공간적 분포를 합리적으로 잘 모의하는 것으로 사료된다. Soil temperature is one of the most important environmental factors that govern hydrological and biogeochemical processes related to diffuse pollution. In this study, considering the snowmelting and the soil freezing-thawing processes, a set of computer codes to estimate winter soil temperature has been developed for CAMEL (Chemicals, Agricultural Management and Erosion Losses), a distributed watershed model. The model was calibrated and validated against the field measurements for three months at 4 sites across the study catchment in a rural area of Yeoju, Korea. The degree of agreement between the simulated and the observed soil temperature is good for the soil surface (<TEX>$R^2$</TEX> 0.71~0.95, RMSE <TEX>$0.89{sim}1.49^{circ}C$</TEX>). As for the subsurface soils, however, the simulation results are not as good as for the soil surface (<TEX>$R^2$</TEX> 0.51~0.97, RMSE <TEX>$0.51{sim}5.08^{circ}C$</TEX>) which is considered resulting from vertically-homogeneous soil textures assumed in the model. The model well simulates the blanket effect of snowpack and the latent heat flux in the soil freezing-thawing processes. Although there is some discrepancy between the simulated and the observed soil temperature due to limitations of the model structure and the lack of data, the model reasonably well simulates the temporal and spatial distributions of the soil temperature and the snow water equivalent in accordance with the land uses and the topography of the study catchment." @default.
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• W2024089733 date "2014-10-31" @default.
• W2024089733 modified "2023-10-14" @default.
• W2024089733 title "Simulation of Spatio-Temporal Distributions of Winter Soil Temperature Taking Account of Snow-melting and Soil Freezing-Thawing Processes" @default.
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