Abstract
Numerical experiments of soil water movement and bedrock infiltration based on a simplified simulation method were conducted to analyze watershed-scale rainfall-runoff processes. To verify the model accuracy, it was applied to a Minamitani watershed (0.45 ha). The simulation was performed with 2.5-m space grids horizontally and five cells vertically. Results of long-term calculation of this model proved that this simulation model is robust and demonstrated good computational water mass conservation. Calculation results showed the best agreement with observed hydrographs and the number of groundwater levels simultaneously when laboratory-tested soil hydraulic characteristics for topsoil were used and infiltration into bedrock was included in numerical calculations. Numerical experiments show that bedrock infiltration generated a stable base flow and suppressed the secondary discharge peak. The reproducibility achieved by observed soil hydraulic characteristics with the assumption of bedrock flow demonstrates the effectiveness of the simulation model used in this article for analyses of watershed-scale soil water movements.
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References
PY Bernier (1985) ArticleTitleVariable source areas and storm-flow generation: an update of the concept and a simulation effort J Hydrol 79 195–213 Occurrence Handle10.1016/0022-1694(85)90055-1
MA Celia ET Bouloutas RL Zarba (1990) ArticleTitleA general mass-conservative numerical solution for the unsaturated flow equation Water Resour Res 26 1483–1496 Occurrence Handle10.1029/90WR00196
RA Freeze (1971) ArticleTitleThree-dimensional, transient, saturated-unsaturated flow in a groundwater basin Water Resour Res 7 347–366 Occurrence Handle10.1029/WR007i002p00347
K Huang BP Mohanty MT van Genuchten (1996) ArticleTitleA new convergence criterion for the modified Picard iteration method to solve the variably saturated flow equation J Hydrol 178 69–91 Occurrence Handle10.1016/0022-1694(95)02799-8
Katsuyama M, Ohte N, Kabeya N (2005) Effects of bedrock permeability on hillslope and riparian groundwater dynamics in a weathered granite catchment. Water Resour Res DOI 10.1029/2004WR003275
K Kosugi T Uchida T Mizuyama (2004) ArticleTitleNumerical calculation of soil pipe flow and its effect on water dynamics in a slope Hydrol Process 18 777–789 Occurrence Handle10.1002/hyp.1367
Y Onda Y Komatsu M Tsujimura J Fujihara (1999) ArticleTitlePossibility for predicting landslide occurrence by analyzing the runoff peak response time (in Japanese) J Jpn Soc Eros Control Eng 51 48–52
Y Shinomiya K Takahashi M Kobiyama J Kubota (2001) ArticleTitleEvaluation of the tortuosity parameter for forest soils to predict unsaturated hydraulic conductivity J For Res 6 221–225
K Shiraki (1998) ArticleTitleA new method for simulating water flow in hillslope soils using coarse space grids (in Japanese with English abstract) J Jpn Soc Hydro Water Res 11 586–598
K Shiraki (1999) ArticleTitleLong-term simulation of discharge and soil water content profile at a slope lysimeter (in Japanese with English abstract) J Jpn Soc Hydro Water Res 12 97–108
K Shiraki (2000) ArticleTitleLong-term simulation of soil water flow at a mountainous watershed by a simplified solution of the three-dimensional saturated and unsaturated flow equation (in Japanese with English abstract) J Jpn Forest Res 82 364–372 Occurrence Handle1:CAS:528:DC%2BD38XjtlSisrY%3D
MT van Genuchten (1980) ArticleTitleA closed-form equation for predicting the hydraulic conductivity of unsaturated soils Soil Sci Soc Am J 44 892–898 Occurrence Handle10.2136/sssaj1980.03615995004400050002x
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Shiraki, K., Shinomiya, Y. & Shibano, H. Numerical experiments of watershed-scale soil water movement and bedrock infiltration using a physical three-dimensional simulation model. J For Res 11, 439–447 (2006). https://doi.org/10.1007/s10310-006-0242-7
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DOI: https://doi.org/10.1007/s10310-006-0242-7