斜面崩壊丘陵地における自然降雨下での土壌水分動態の把握
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概要
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Soil water content and water pressure were monitored in a test pit excavated in a forested hilly soil during Dec. 2001 to Nov. 2002. The present monitoring system worked well, and provided us useful information successively on soil water dynamics. Rapid drainage of rainwater occurs not only in a heavy rainfall but also in a small amount of rainfall, suggesting that preferential flow is generated as soon as a rainfall starts. This occurs because a soil matrix is fully saturated with water under the soil moisture condition throughout the monitoring period. Field-measured hydraulic conductivities are larger than those that are laboratory-measured. The reason is explained as follows: that macropores are well connected in macro-scale so that preferential flow paths are easily formed in the field. In a small sample, however, macropores are not fully connected to make preferential flow paths through them.
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