Morphology, structure and flow phases in soil pipes developing in forested hillslopes underlain by a Quaternary sand–gravel formation, Hokkaido, northern main island in Japan
✍ Scribed by Tomomi Terajima; Tomoki Sakamoto; Tomoki Shirai
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 828 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0885-6087
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✦ Synopsis
Preferential ¯ow pathways, such as soil pipes, are usually present in the soil of slopes. Subsurface ¯ow through the soil pipes aects the subsurface drainage system and is responsible for sediment removal from slopes. However, a record of the inner structure of soil pipes has rarely been reported for slopes. A ®brescope examination of the morphology and ¯ow phases in soil pipes in hillslopes underlain by a Quaternary sand± gravel formation provided the following information: the main pores of the soil pipes ran mostly parallel with the slope gradient; the cross-sections of the soil pipes were approximately circular; and occurred on a few occasions; with some triple junctions being present. In addition, both full ¯ow and partly full-depth conditions occurred simultaneously in the soil pipe. The full ¯ow condition has long been used in hydrological studies to model the pipe ¯ow mechanism. Both the full ¯ow condition and the partly full-depth condition, however, must be examined closely in order to evaluate the subsurface hydrology in heterogeneous soil and the hydrogeomorphological processes of subsurface hydraulic erosion.