Morphology, structure and flow phases in soil pipes developing in forestedhillslopes underlain by a Quaternary sand-gravel formation, Hokkaido, northern main island in Japan

Citation
T. Terajima et al., Morphology, structure and flow phases in soil pipes developing in forestedhillslopes underlain by a Quaternary sand-gravel formation, Hokkaido, northern main island in Japan, HYDROL PROC, 14(4), 2000, pp. 713-726
Citations number
41
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
HYDROLOGICAL PROCESSES
ISSN journal
0885-6087 → ACNP
Volume
14
Issue
4
Year of publication
2000
Pages
713 - 726
Database
ISI
SICI code
0885-6087(200003)14:4<713:MSAFPI>2.0.ZU;2-R
Abstract
Preferential flow pathways, such as soil pipes, are usually present in the soil of slopes. Subsurface flow through the soil pipes affects the subsurfa ce drainage system and is responsible for sediment removal from slopes. How ever, a record of the inner structure of soil pipes has rarely been reporte d for slopes. A fibrescope examination of the morphology and flow phases in soil pipes in hillslopes underlain by a Quaternary sand-gravel formation p rovided the following information: the main pores of the soil pipes ran mos tly parallel with the slope gradient; the cross-sections of the soil pipes were approximately circular; and occurred on a few occasions; with some tri ple junctions being present. In addition, both full flow and partly full-de pth conditions occurred simultaneously in the soil pipe. The full flow cond ition has long been used in hydrological studies to model the pipe flow mec hanism. Both the full flow condition and the partly full-depth condition, h owever, must be examined closely in order to evaluate the subsurface hydrol ogy in heterogeneous soil and the hydrogeomorphological processes of subsur face hydraulic erosion. Copyright (C) 2000 John Wiley & Sons, Ltd.