土壌モデルの地中下端境界条件が地表面における長時間の熱および水分交換過程に及ぼす影響
書誌事項
- タイトル別名
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- Influence of Bottom Boundary Conditions of the Model on the Simulated Long Term Energy/Water Exchange at Land Surface
- A Sensitivity Study Using a 1-D Atmosphere-Land Model
- 1次元大気境界層-陸面モデルを用いた感度分析
抄録
A one-dimensional atmosphere-land model is developed and the sensitivity of the bottom boundary condition on the long term exchange process of heat and water at the ground surface is investigated as a fundamental study to improve the land surface scheme for climate models. The results suggest that the treatment of the deep water should be more careful than that of the conventional schemes. In order to consider the deep water explicitly, we calculated the equilibrium state of the soil water profile for the extreme case in which the ground water is permeable into sufficiently deep soil layer without runoff. The result is compared with those for the conventional boundary conditions of the gravity drainage and the bucket-type model. It is concluded that the evaporation rate with these boundary conditions are similar when the precipitation is much less or much greater than the saturated equilibrium evaporation rate (the evaporation rate of the equilibrium state with full evaporation efficiency). In the case where the precipitation is as great as the saturated equilibrium evaporation rate, or in the transition from the equilibrium state for heavier precipitation to the lighter one, the evaporation is maintained by the capillary rise of the deep water when the deep water is treated explicitly. If such a phenomenon actually occurs in the real climate change, the boundary condition of the gravity drainage must be reconsidered.
収録刊行物
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- 水文・水資源学会誌
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水文・水資源学会誌 7 (4), 259-267, 1994
水文・水資源学会
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詳細情報 詳細情報について
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- CRID
- 1390001204440411392
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- NII論文ID
- 130003664295
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- ISSN
- 13492853
- 09151389
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- データソース種別
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- JaLC
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- 抄録ライセンスフラグ
- 使用不可