Variation in soil characteristics and hydrologic properties associated with historic land use near a recent landslide, Nagano Prefecture, Japan

Shoaei, Gholamreza; Sidle, Roy C.

doi:10.1016/j.geoderma.2009.07.012

Cited by 7 publications

(3 citation statements)

References 31 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…formation of a discontinuous black organic‐rich soil layer as a result of periodic burning of vegetation) and hydraulic properties. The poorly permeable organic layer led to formation of a perched ground water table during the long rainfall event with high total precipitation, thus providing the necessary pore pressure conditions for slope failure (Shoaei and Sidle, ). The soil was classified as a Dystric Cambisol (IUSS Working Group WRB, ), with textures varying from sand (15‐ to 45‐cm depth) to loamy sand (45‐ to 100‐cm depth) and silty loam (>100‐cm depth).…”

Section: Objects and Methodsmentioning

confidence: 99%

“…The soil was classified as a Dystric Cambisol (IUSS Working Group WRB, 2014), with textures varying from sand (15-to 45-cm depth) to loamy sand (45-to 100-cm depth) and silty loam (>100-cm depth). The sequence of soil horizons was as follows: (i) a 20-cm thick upper layer (A 0 -horizon), (ii) an 80-cm thick A-horizon, (iii) a 60-to 80-cm thick B-horizon, (iv) a 10-to 40-cm thick black organic anthropogenic soil horizon and (v) a 60-to 80-cm thick C-horizon (Gerke et al, 2008;Shoaei and Sidle, 2009). Near the landslide scar, the depth of the soil is up to 3.5 m, overlying the andesitic bedrock.…”

Section: Field Sitesmentioning

confidence: 99%

See 1 more Smart Citation

Preferential flow mechanisms identified from staining experiments in forested hillslopes

Gerke

Sidle

Mallants

2015

Hydrological Processes

Self Cite

View full text Add to dashboard Cite

Abstract:Field staining experiments in five different plots at two sites in Japan (Okaya in Nagano Prefecture and Konohara in Mie Prefecture) were undertaken to improve understanding of subsurface stormflow runoff within organic layers of natural forested hillslopes. This type of shallow lateral subsurface flow, specifically referred to as biomat flow, was observed only at the Okaya site based on staining experiments conducted under controlled water application rates. When the same irrigation rate (50-100 mm h À1 ) was applied to the Konohara site, overland flow without a significant shallow subsurface component was the dominant flow mechanism. Even in gently sloping (15-20°) forest soils at the Okaya site, biomat flow was responsible for lateral dye transport over much longer distances than subsurface flow in the matrix of mineral soil layers. Based on analysis of staining pattern images observed in the Okaya site, we conclude that (i) the organic biomat layer could be divided into two sub-layers of different structure, (ii) biomat flow transported the dye tracer longer distances than subsurface flow in the matrix and (iii) the biomat layer topography affected biomat flow by generating preferential flowpaths and subsequent percolation into the deeper soil. Based on field experimental results and pore-scale consideration of water infiltration into pores of soils with varying wettability properties, we hypothesized and developed a conceptual model for two key biomat flow mechanisms. The first mechanism considers lateral subsurface flow because of a permeability contrast between the much more porous and hence permeable biomat layer and the underlying mineral soil. The second mechanism involves a hydrophobic soil layer between the biomat and the underlying mineral soil. Flow across the hydrophobic layer is believed to occur when a threshold pore pressure is exceeded, i.e. as a result of a perched water table within the biomat layer. Lower pore pressures are needed to initiate flow when preferential flow paths exist, which are less hydrophobic than the surrounding organic layers. Numerical models of catchment hydrology should include lateral biomat flow when such layers are present in hillslope soils, in addition to typical subsurface flow within the soil matrix.

show abstract

Section: Objects and Methodsmentioning

confidence: 99%

Section: Field Sitesmentioning

confidence: 99%

Preferential flow mechanisms identified from staining experiments in forested hillslopes

Gerke

Sidle

Mallants

2015

Hydrological Processes

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, these hydrogeomorphic processes are strongly affected by bioclimatic factors, particularly with respect to vegetation cover, precipitation type and regime, and temperature. During the past decade, major progress has been made in assessing hydrogeomorphic processes through time and especially across spatial regimes related to landslides and debris flows (Benda et al 2003; Imaizumi and Sidle 2007; Shoaei and Sidle 2009), surface erosion by water (Chappell et al 2004; Fanning 1999; Ziegler et al 2000; and stormflow generation (Detenbeck et al 2005; Gomi et al 2008; Sidle et al 2000). These processes are tightly coupled and are discussed here for both temperate and humid tropical forests with an emphasis on which hydrogeomorphic processes dominate in these steep catchments (typical gradients >30°) and why, and at what spatial scales the dominant processes change.…”

Section: Introductionmentioning

confidence: 99%

Hydrogeomorphic Processes in Temperate and Tropical Forests: Effects of Land Use and Scale

Sidle

2010

Geography Compass

Self Cite

View full text Add to dashboard Cite

The science of hydrogeomorphology has evolved during the past few decades to include not only the coupling of hydrologic and geomorphic processes but also the spatial and temporal interactions of these processes. Bioclimatic factors play an important role in determining which hydrologic and geomorphic processes dominate in various environments and how these processes evolve and distribute in time and space. Herein, sediment production and transport are discussed as examples of important hydrogeomorphic phenomena at different spatial and temporal scales in the context of climate, forest cover, hydrology, and geomorphic setting. Examples are presented that illustrate the dominant hydrogeomorphic processes in steep (typical slope gradients >30°) humid tropical and temperate forests. Landslides contribute substantial sediment loads to streams, particularly in steep temperate forest terrain; however, the timing between the mass wasting event on the hillslope and the delivery and mobilization of the sediment in the channel can be highly variable. Linkages between surface erosion on hillslopes and sediment response in streams are more direct if connected pathways exist. The connectivity of sediment sources with flow pathways in catchments can be greatly enhanced by land uses (particularly unpaved roads and trails) that compact and disturb soils and redistribute water onto susceptible landforms.

show abstract

The influence of bedrock geology and slip surface characteristics on failure mode and mobility: a comparative study of instability patterns in Nigeria

Igwe

2015

Arab J Geosci

View full text Add to dashboard Cite

Variation in soil characteristics and hydrologic properties associated with historic land use near a recent landslide, Nagano Prefecture, Japan

Cited by 7 publications

References 31 publications

Preferential flow mechanisms identified from staining experiments in forested hillslopes

Preferential flow mechanisms identified from staining experiments in forested hillslopes

Hydrogeomorphic Processes in Temperate and Tropical Forests: Effects of Land Use and Scale

The influence of bedrock geology and slip surface characteristics on failure mode and mobility: a comparative study of instability patterns in Nigeria

Contact Info

Product

Resources

About